Rules for Classification and Construction

Part 1 Seagoing Ships

RULES FOR CLASSIFICATION

AND SURVEYS

Volume I
January 2025 Edition

Biro Klasifikasi Indonesia www.bki.co.id

Rules for Classification and Construction
Part 1 Seagoing Ships

RULES FOR CLASSIFICATION

AND SURVEYS

Volume I
January 2025 Edition

Copyright © 2025 Biro Klasifikasi Indonesia

Jl. Yos Sudarso No. 38-40, Tanjung Priok
Jakarta 14320 - Indonesia
rules@bki.co.id
www.bki.co.id
Amendments to the preceding Edition are marked by red colour and expanded text.
However, if the changes involves the whole section or sub section normally only the
title will be in red colour.

Reproduction in whole or in part by any means of these Guidance, is subject to the permission in writing
by Biro Klasifikasi Indonesia Head Office.
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Foreword

Foreword
This Rules for Classification and Surveys (Pt.1, Vol.I) January 2025 Edition replaces the Rules for Classification
and Surveys (Pt.1, Vol.I) July 2024 edition. In this edition, new amendments are introduced which are mainly
derived from IACS publications, and inputs from BKI Branch Offices and Technical Division BKI Head Office
The summary of previous edition and amendments including the implementation date are indicated in Table
below:

No. Edition/ Rule Change Notice (RCN) Effective Date Link

1 July 2024 Edition 1st July 2024
2 Consolidated Edition 2024 -
3 RCN No.3, October 2023 1st January 2024
4 RCN No.2, April 2023 1st July 2023
5 RCN No.1, October 2022 1st January 2023
6 Consolidated Edition 2022 -
7 RCN No.2, November 2021 1st January 2022
8 Corr No.1, August 2021 1st August 2021
9 RCN No.1, May 2021 1st July 2021
10 Consolidated Edition 2021 -
11 RCN No.2,December 2020 1st January 2021
12 RCN No.1, July 2020 1st August 2020
13 Edition 2019 1st July 2019
14 RCN No.1, October 2018 1st January 2019
15 Edition 2018 1st April 2018

A summary of amendments to the previous edition, including the implementation date for each section, is
presented in Table 1 - Amendments incorporated in This Notice.
This rules is available to be downloaded at www.bki.co.id. Once downloaded, this Rules will be uncontrolled
copy. Please check the latest version on the website.
Further queries or comments concerning this Rules are welcomed through communication to BKI Head
Office.

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Vol I Rules for Classification and Surveys
Rules Amendment Notice

Rules Amendment Notice

Table 1 - Amendments incorporated in This Notice
These amendments will come into force on 1st January 2025, except stated otherwise as indicated in the
Table

Paragraph Title/Subject Status/Remark

Surveys 3 – General Requirements
The amendments are effective from 1 July 2025
B. Surveys for Maintenance of Class
1. Periodical surveys
1.1 Annual Surveys
1.1.2 Scope
1.1.2.12) - Added new requirement about lashing
software based on IACS UR C6
1.3 Class Renewal Surveys
1.3.2 Scope
1.3.2.17).D) - Added new requirement about lashing
software based on IACS UR C6
Section 4 Surveys
II Additional Requirements for Ships Not Subject to ESP Notation
C. Shell Doors, Stern Doors, Inner Doors and Bow Doors of Ro-Ro Ships
4. Retrospective Application of Side Shell Doors, Removed the requirement and move it
Stern Doors, Bow Doors and Inner Doors to existing to Section 5, G
Ro-Ro Passenger Ships (UR S15 and S16)
Section 5 Retrospective Requirements for Existing Ships Added new information about
retrospective requirement based
on SOLAS and IACS URs

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Pt 1 Seagoing Ships
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Table of Contents

Table of Contents

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Rules Amendment Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Section 1 General Term and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
B. Reservation Clause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
C. Scope and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
D. Confidentiality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
E. Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
F. Payment of Invoices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
G. Liability and Jurisdiction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
H. Disagreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
I. Anti-Bribery and Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Section 2 Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
B. Validity of Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
C. Classification of New building ships . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
D. Classification of Ships after construction (ship in service) . . . . . . . . . . . . . . 2-16

Section 3 Surveys – General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
B. Surveys for Maintenance of Class . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
C. Periodic Survey of Fuel Installations on Ships other than Liquefied Gas Carriers
utilizing gas or other low flash point fuels . . . . . . . . . . . . . . . . . . . . . . 3-55
D. Thickness Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59

Section 4 Surveys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

I. Additional Requirements for Ships with ESP Notation . . . . . . . . . . . . . . . . . . . . 4-1
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
B. Oil Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
C. Double Hull Oil Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
D. Chemical Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
E. Bulk Carriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35
F. Double skin Bulk Carriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50
II. Additional Requirements for Ships Not Subject to ESP Notation . . . . . . . . . . . . . . . 4-62
A. Liquefied Gas Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62
B. General Dry Cargo Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71
C. Shell Doors, Stern Doors, Inner Doors and Bow Doors of Ro-Ro Ships . . . . . . . . 4-82
D. Livestock Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-86

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Section 5 Retrospective Requirements for Existing Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

A. General requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
B. Construction – structure, subdivision and stability, machinery and electrical
installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
C. Construction –Fire protection, fire detection and fire extinction . . . . . . . . . . 5-3
D. Additional safety measures for bulk carriers . . . . . . . . . . . . . . . . . . . . . 5-5
E. Strength and securing of small hatches on the exposed fore deck and air pipes,
ventilator pipes and their closing devices thereover . . . . . . . . . . . . . . . . . 5-9
F. Loading instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
G. Requirements for the fitting of side shell doors, stern doors, bow doors and inner
doors of ro-ro passenger ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
H. Watertightness of chain lockers . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
I. Ice class draught mark of ships intended for navigation in ice . . . . . . . . . . . . 5-12
J. Requirements for electrical distribution system including harmonic filters . . . . . 5-12

Annex A Annexes to Section 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

A.1 Procedures for Confined Space Safe Entry . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
B. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
C. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
A.2 Hull Survey for New Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
A. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
B. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
C. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
D. Qualification and monitoring of personnel . . . . . . . . . . . . . . . . . . . . . . A-8
E. Survey of the hull structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
F. Review of the construction facility . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
G. New building survey planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
H. Examination and test plan for newbuilding activities . . . . . . . . . . . . . . . . A-11
I. Proof of the consistency of surveys . . . . . . . . . . . . . . . . . . . . . . . . . A-11
J. Ship Construction File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
K. Requirements for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part A-1
Regulation 3-10 (Goal-based ship construction standards for bulk carriers and oil
tankers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
A.3 The Wastage Allowance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-34
A.4 Class Requirements of Laid-Up Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
B. Safety conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
C. Preservation measures for lay-up and maintenance . . . . . . . . . . . . . . . . . A-37
A.5 Survey of Watertight Cable Transits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-43
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-43
B. Cable Transit Seal Systems Register . . . . . . . . . . . . . . . . . . . . . . . . . A-43
C. Installation and Maintenance of Watertight Cable Transits . . . . . . . . . . . . . A-44
A.6 Testing Procedures of Watertight Compartments . . . . . . . . . . . . . . . . . . . . . . A-45
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-45
B. SOLAS Ships (Ships Built in Compliance with SOLAS 1974 as Amended) . . . . . . . A-45
C. SOLAS Exempt/ Equivalent Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . A-54
D. Non-SOLAS Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-55
A.7 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-57
A.8 List of Contact Points for Changing Classification Status . . . . . . . . . . . . . . . . . . . A-66

Annex B Annexes to Section 4-I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

B.1 Owner’s Inspection Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

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B.2 Example of Survey Programme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

B.3 Survey Planning Questionnaire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
B.4 Technical Assessment in Conjunction with the Planning of Enhanced Surveys for Class
Renewal Survey Hull . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
B.5 Requirements for Extent of Thickness Measurement at Areas of Substantial Corrosion . . . B-16
B.6 Guidelines for the Gauging of the Vertically Corrugated Transverse Watertight Bulkhead
Between Holds No. 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26
B.7 Guidelines for the Thickness Measurements of Side Shell Frames and Brackets in Single-Side
Skin Bulk Carriers Required to Comply with URS 31 . . . . . . . . . . . . . . . . . . . . . B-29
B.8 Additional Annual Survey Requirements for the Foremost Cargo Hold of Ships Subject to
Regulation XII/9 of the Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-32
B.9 Strength of Cargo Hatch Cover Securing Arrangements for Bulk Carriers . . . . . . . . . . B-33
B.10 Criteria for Longitudinal Strength of Hull Girder for Oil Tankers . . . . . . . . . . . . . . . B-33
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-33
B. Evaluation of longitudinal strength . . . . . . . . . . . . . . . . . . . . . . . . . . B-33
C. Sampling method of thickness measurements for longitudinal strength evaluation
and repair methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-34
B.11 Renewal Criteria for Side Shell Frames and Brackets in Single Side Skin Bulk Carriers and
Single Side Skin OBO Carriers not Built in accordance with UR S12 Rev.1 or subsequent
revisions (UR S31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-35
B.12 ESP Survey Reporting Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-46
B.13 Recommended Procedures for Thickness Measurements . . . . . . . . . . . . . . . . . . B-63
A. Recommended Procedures for Thickness Measurements of Ships . . . . . . . . . B-63
B. Recommended Procedures for Thickness Measurements of Ships Built According to
The Net Scantling Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-73
C. Recommended Procedures for Thickness Measurements of Bulk Carriers . . . . . B-100
D. Recommended Procedures for Thickness Measurements of Double Hull Oil Tankers B-118
E. Recommended Procedures for Thickness Measurements of Double Skin Bulk CarriersB-134

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Sec 1 General Term and Conditions

Section 1 General Term and Conditions

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
B. Reservation Clause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
C. Scope and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
D. Confidentiality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
E. Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
F. Payment of Invoices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
G. Liability and Jurisdiction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
H. Disagreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
I. Anti-Bribery and Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

A. General
1. Biro Klasifikasi Indonesia (hereinafter referred to as ”BKI”) was established in 1964, under the
enactment of Government Regulation of the Republic of Indonesia number 28/1964, as a State-owned
Company for the purpose of providing amongst other things a faithful and accurate classification of ships
classed with it, to approve designs of, to survey and to issue reports on ships, as well as technical certification
services, all within the scope of classification described in the Rules.
2. In delivering its services, BKI acts and assures its independency, impartiality and objectivity.
3. The rights of interpretation of BKI Technical Rules rest with BKI alone.
4. The respective latest version of the General Terms and Conditions are applicable to all services
rendered by BKI, including those rendered within the scope of their statutory functions, even if no separate
agreement has from case to case been reached regarding their applicability. Where contractual relations
are established between BKI and any persons other than the client, the relevant Technical Rules and the
provisions of G.1 to G.6. Below shall also apply to such third parties.
5. BKI also provides technical analyses services.

B. Reservation Clause
1. No confirmation or certification (certificates) with regard to compliance of technical facts or products
with the technical Rules issued by BKI shall be given or issued by anybody other than BKI.
Without relevant Certificates being issued by BKI, no statements shall be made to the effect that the product
in question was manufactured in accordance with the Rules of BKI.
2. A confirmation given or certificate issued shall not release the client from his contractual obligations
towards third parties.
3. Certificates are issued by BKI subject to withdrawal at any time. The right of withdrawal may, for
instance, be exercised in the event of adaptations to the technical Rules or of the client failing to comply in
due time with conditions or instructions issued by BKI.

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Sec 1 General Term and Conditions C.

C. Scope and Performance

1. The kind and scope of services rendered by BKI are based on the relevant agreements concluded
and always, in the absence of an express special agreement, on the Rules for Classification and Surveys
applicable at the time of Class inspections and/or surveys and, with respect to the review of construction
documents, on the Construction Rules applicable at the time the contract was made between the shipyard
and the ordering party of the vessel.
Safety relevant changes to the Construction Rules made after the date of “contract for construction” shall
be taken into consideration.
With respect to flag state inspections the relevant regulations shall apply. The classification of a ship with
BKI does not exempt the owners from compliance with any additional and/or more stringent requirements
issued by the Administration of the state whose flag the ship is entitled to fly and provision for their
application.
2. It is the client’s obligation to ensure that the services of BKI can be rendered smoothly and without
delay. Therefore, all such preparations as required to conduct the survey and audit are to be made by the
client in accordance with the requirement of the Rules. BKI shall, to the extent requested scope, be granted
unrestricted access and the right of survey and audit.
Any information, drawings, etc. required for performance of the functions and activities of BKI shall be
made available in due time.
3. Before BKI personnel starts to work, the client shall inform BKI about relevant safety issues and be
responsible to take all necessary safety related measures to ensure a safe work environment for the persons
carrying out the work for BKI and shall comply with all legal and other safety regulations.
In case of enclosed space, safe entry shall be according to Annex A.1 (Procedural for Confined Space Safe
Entry)
4. When BKI personnel on duty deems, there is a lack of preparation, unsafe working environment or
non-fulfilment to the applicable legal and safety regulations according to C.2 and C.3, BKI personnel may
decline to work until such conditions are inexistence.
Related to the provision of E., clients shall be accounted for delays took place resulting from cases of the
above.
5. The client acknowledges and consents to the fact that BKI may delegate work related to this contract to
partner of the BKI. BKI is responsible for delegated work in accordance with the provisions of this contract.
6. BKI is only responsible for services it has delivered directly.

D. Confidentiality
BKI will treat as confidential any documentation and information received in connection with orders placed
with BKI. Such documentation and information may be passed on to third parties solely with prior written
consent of the party entitled thereto. See Section 2, A.1.7.
The above is without prejudice to any obligations towards the authorities of the State of the Flag.

E. Fees
For services rendered by BKI fees are to be paid in accordance with the BKI’s Tariffs of Fees, even if
no classification is granted. In addition to these fees, BKI will charge for any expenses incurred in
connection with the services rendered (e.g. travelling or other expenses and, where applicable, any value
added/turnover tax).

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Sec 1 General Term and Conditions F.

F. Payment of Invoices
The fees for all services rendered by BKI are due for payment without deduction not later than 28
(twentyeight) calendar days after the date of received Invoice. On default BKI entitled to withhold the
next survey, Certificates and other documents.

G. Liability and Jurisdiction

1. BKI’s omission or failure to carry out or observe any stipulation, condition or obligation to be performed
to the contract will not give rise to any claim against BKI or be deemed to breach the contract if the omission
or failures arises from caused beyond BKI reasonable control.
2. BKI will be liable for loss or damage, if it proved that the loss resulted directly from an act or omission of
the BKI done. The liability of BKI shall be limited in its amount up to maximum of the fee for that particular
service.
3. Rights to Claims of the client for defects as to quality shall become time barred 3 (three) months after
acceptance by the client of the performance by BKI of its obligations.
4. Any disputes arising from the interpretation and implementation of the contract shall be settled so far
as possible by negotiation with deliberation.
5. The place of performance for all obligations resulting from or in connection with the respective order
from the client is in Pengadilan Negeri Jakarta Utara and the governing law is Indonesian Law.
6. The exclusive place of jurisdiction for claims against BKI is in Pengadilan Negeri Jakarta Utara. BKI is
entitled to sue the client before the courts in Pengadilan Negeri Jakarta Utara.

H. Disagreement
1. In the event that individual provisions of the contract between BKI and the client or these General
Terms and Conditions are or become partly or as a whole ineffective, this will not affect the effectiveness
of the remaining terms.
2. In the event of doubts as to the interpretation of the present General Terms and Conditions, the English
text shall be authoritative.

I. Anti-Bribery and Compliance

1. The Surveyors of BKI are not permitted to receive any fee, gratuity or reward whatsoever, for their own
use or benefit, for any services performed by them in their capacity as Surveyors to BKI.
2. The parties shall conduct their respective business activities in a fair, ethical, and lawful manner in
accordance with all applicable laws and generally accepted codes of conduct, and avoid any unacceptable
activities.
3. Customer shall indemnify and hold harmless BKI from any breach of Clause 2. above.

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Section 2 Classification
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
B. Validity of Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
C. Classification of New building ships . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
D. Classification of Ships after construction (ship in service) . . . . . . . . . . . . . . 2-16

A. General
1. Rules, Regulations and Guidelines
1.1 Underlying Technical Rules & Regulations
1.1.1 The Classification of ships, other floating units and any pertinent equipment is based on:
— unless stated otherwise in the specific sections, the respective latest edition of the Rules for
Classification and Surveys (Pt.1, Vol.I),
— the Construction Rules, Regulations and Guidelines relating to the respective ship type or installation,
as applicable on the date of conclusion of the contract between shipyard (manufacturer) and ship
owners (client), see also C.1.
1.1.2 The Construction Rules cover (Part 1 of Vol. II, Vol. III, Vol. IV, Vol.V, and Vol. VI) Rules for Hull, Rules
for Machinery Installations, Rules for Electrical Installations, Rules for Materials and Rules for Welding and
any other special Rules published by BKI that may be applicable from case to case 1) .
1.1.3 In case of bilingual editions, the English text shall be authoritative in the event of doubts as to the
interpretation of the BKI Technical Rules and Regulations, except Section 1, General Terms and Conditions.
1.1.4 For ship navigating in Indonesian waters only, Peraturan Kapal Domestik (Bag.8, Vol.I) applies.

1.2 The following shall apply unless otherwise specified

1.2.1 The date of ”contract for construction” of a vessel is the date on which the contract to build the
vessel is signed between the prospective ship owner and the shipyard. This date is normally to be declared
to BKI by the ordering client applying for the assignment of Class to a newbuilding, see also C.1.
1.2.2 The date of ”contract for construction” of a series of sister vessels, including specified optional
vessels for which the option is ultimately exercised, is the date on which the contract to build the series is
signed between the prospective ship owner and the shipbuilder.
Vessels built under a single contract for construction are considered a “series of vessels” if they are built
to the same approved plans for classification purposes. However, vessels within a series may have design
alterations from the original design provided:
— such alterations do not affect matters related to classification, or
— If the alterations are subject to classification requirements, these alterations are to comply with the
classification requirements in effect on the date on which the alterations are contracted between the
prospective owner and the shipbuilder or, in the absence of the alteration contract, comply with the
classification requirements in effect on the date on which the alterations are submitted to BKI for
approval.
1)
For Classification and Construction of mobile and fixed offshore installations the Rules for Offshore Installations are
applicable.

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The optional vessels will be considered part of the same series of vessels if the option is exercised not later
than 1 year after the contract to build the series was signed.
1.2.3 If a contract for construction is later amended to include additional vessels or additional options,
the date of ”contract for construction” for such vessels is the date on which the amendment to the contract
is signed between the prospective ship owner and the shipyard. The amendment to the contract is to be
considered as a ”new contract” to which 1.2.1 and 1.2.2 apply.
If a contract for construction is amended to change the ship type, the date of “contract for construction”
of this modified vessel, or vessels, is the date on which revised contract or new contract is signed between
the Owner, or Owners, and the shipbuilder.
1.2.4 In any case, Section 1, C is to be observed.
1.2.5 The year, month and date at which the new construction survey process is completed shall be
specified as the “Date of Build”. Where there is substantial delay between completion of construction
survey process and the ship commencing active service, the date of commissioning may be also specified.
1.2.6 For ships underwent modification, after modifications are completed, the “Date of Build” shall
remain assigned to the ship.

1.3 Statutory regulations

1.3.1 National Rules and Regulations as, for instance, adopted by the respective flag state will as a matter
of principle not be affected by the Rules for Classification and Construction. However, various requirements
stipulated by International Conventions are taken into account in the BKI Rules, see also Section 3, A.4.
The Guidance for Code and Convention Interpretations (Pt.1, Vol.Y) which is adopted from IACS
Unified Interpretations is applicable to a vessel, its machinery and equipment, in accordance with the
implementation dates and provisions stated in this guidance, when acting as a Recognized Organization,
authorized by a flag State Administration to act on its behalf, unless provided with written instruction to
apply a different interpretation by the flag Administration.
1.3.2 Disclaimer
Statutory requirements are continuously being processed and updated by the IMO and the entry into force
date may not coincide with the annual release of BKI Rules. BKI makes an effort to keep BKI Rules up to
date with mandatory requirements; however, BKI could not accept any liability for damages incurred in this
context.

1.4 Responding to Port state control

1.4.1 When BKI’s classed ship is detained by Port State Control and the deficiencies are related to
Statutory Certificates issued by Biro Klasifikasi Indonesia on behalf of a flag State, BKI is to be immediately
notified by the owner or operator or other person responsible for the operation of the ship.
1.4.2 In case of deficiencies related to the Cargo Ship Safety Construction Certificate, however, it is also
essential to notify BKI, regardless the flag state of the vessels.
1.4.3 When requested by Port State Control and upon concurrence by the owner/operator, BKI Surveyor
would attend on board a ship in order to assist in the rectification of reported deficiencies or other
discrepancies.
1.4.4 Reporting of Deficiencies relating to Possible Safety Management System Failures

.1 When deficiencies relating to possible safety management system failures are identified by the
Surveyor during a periodical (Annual/Intermediate/Class Renewal) survey or occasional survey, Statutory
Surveys and additional surveys relevant to Port State Control, a report is to be completed by the Surveyor
and sent to BKI Head office. The report are covers the following aspects:

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i) deficiencies relating to technical conditions which may lead to the limitation, suspension or
withdrawal of a Class or Statutory Certificate;

ii) deficiencies relating to documentation;

iii) deficiencies relating to operational requirements;

iv) other deficiencies which may seriously affect the safety of ship, personnel or the environment.

.2 BKI’ surveyor will inform the master or Company representative that information in the report may be
communicated to the Organisation responsible for the issue of the SMC.

1.5 Effective Date of Rules Application

1.5.1 The effective date of entry into force of any amendments to the Rules and Guidelines is indicated
on Rules and Guidelines Amendment Notice or in the relevant Section.
1.5.2 The application of the Technical Rules and Regulations for admission to newbuilding ships are based
on the contract date for construction between the shipbuilder and the prospective Owner. The term date
of “contract for construction” shall be construed as per 1.2.1 to 1.2.3.
1.5.3 The amendment of rule requirements is made applicable to periodical surveys of ship in operation
when the date of rule amendments become effective.
1.5.4 In the case of major conversions or alterations of vessels shall in general comply with the rules
applicable at the time of application is received by BKI.
1.5.5 Amendments to the rules may be made retroactive for certain ships in operation and under
construction at a given date or an upcoming survey to comply with class or statutory requirements.

1.6 Classification Limitation

The Rules, surveys performed, reports, certificates and other documents issued by BKI are not meant
as a substitute for duties, responsibilities and obligations of other parties such as Administrations,
actual or prospective Owners or Operators, masters, and crew, Charterers, Brokers, Cargo-owners and
Underwriters, naval architects, marine engineers, Designers, Shipbuilders, Manufacturers, Repairers,
Suppliers, Contractors or Sub-contractors.

1.7 Transparency of classification and statutory information

1.7.1 The classification and statutory information which may be released to Ship-owners, Flag State, Port
state, Insurance company and Shipyards as relevant and the conditions for their release are indicated in
Table 2.1.

2. Scope
2.1 Classification covers the ship’s hull and machinery, including electrical installations and anchoring
equipment
2.2 On request, certain installations e. g. refrigerating installations may be classed separately, see 2.7.
2.3 BKI reserves the right to extend the scope of Classification to all equipment and machinery used in the
operation of the ship, which by their Character and / or arrangement may impair the safety or arrangement
may impair the safety of human life, of the ship and her cargo or of the environment.
2.4 Structural systems and equipment determining the ship type are subject to examination within the
scope of Classification, if the ship type is specified in the form of a Notation affixed to the Character of
Classification, see Guidance for Class Notation (Pt.0, Vol.B).

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Table 2.1 Transparency of Classification and Information

Information available to:

No Information in Question Owners Flag Port Insurance Ship
State State Company* Yards
1 Class Societies Standing Documents:
– Rules and Guidelines (Class and statutory
1 1 1 1 1
requirements)
– Instructions to Surveyors 1
– Quality Manual 1 1 1 1 1
– Register Book 1 1 1 1 1
2 Ship Related Information:
A. New buildings
– Approved Drawings 6 1 7
– Formal Approval Letters 1 7
– Certificates of Important Equipment 2 7
B. Ships in Operation
I. I. Class Services
– Date (month and year) of all Class Surveys 7 1 1 1
– Expiry Date of Class Certificate 7 7** 1 1
– Certificates/Reports 7 1 6 5
– Overdue Surveys 7 7** 1 1
– Text of Recommendations 7 1 1 5
– Text of Overdue Recommendations 7 1 1 1
– Executive Hull Summary 7 3 3 3
II. Statutory Services
– Due Dates of Statutory Surveys 7 7** 1 1
– Expiry Date of Statutory Certificates 7 7** 1 1
– Registered Statutory Rec. 7 7** 1 5***
– Overdue Statutory Rec. 7 7** 1 1***
3 Other Information:
– Correspondence File with Yard and/or Owner 6 6 5&6
– Audit of Class Societies QA System 4 4 4 4
– Class Transfer Reporting 7 7 7 7
– Class Withdrawal Information 7 7 7 7
* Insurance Company means P&I Clubs and Hull Underwriters.
** If stated in Agreement.
*** Unless prevented by the agreement with the flag State.
Key:
5. When accepted by Owners - or through special clause in
1. Available upon request.
insurance contract.
6. When accepted by Owner (Master) or Shipyard as
2. At delivery of the ship by Shipyard.
applicable.
3. Available under visit on board. 7. Automatically available.
4. Result of audit available on request.

2.5 Where used, the terms “at the discretion of the surveyor” and “as deemed necessary” means the
surveyors will use their professional judgement based on objective evidence to decide the level of survey
required.
2.6 The truth of documentation and information
2.6.1 The submitted documentation and information from clients, which forms the basis for classification
shall, at all times, reflect the true status.
2.6.2 Classification-related documents and information are liable to be invalidated by BKI whenever
their object is found to differ from that on which they were based or to be contrary to the applicable
requirements.

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2.6.3 BKI is not responsible for the consequences arising from any use of the above classification related
documents and information
2.7 Refrigerating installations
2.7.1 For the purpose of the present Rules the following are considered to be refrigerating installations:

— cargo refrigerating installations for the refrigeration of insulated cargo holds

— container refrigerating installations for the refrigeration of insulated containers,

Provided that the refrigerating installations are permanently installed and form an integral part of the ship.
The refrigerating installation includes the technical installations required for power supply.
2.7.2 Reefer units which can be connected to a container and transported in combination therewith, and
containers with or without a reefer unit, are subject to Guidelines for Freight Containers (Pt.6, Vol.8).

3. Class Certificate
3.1 Assignment of Class, issuance of the Class Certificate, and assignment of the corresponding Character
of Classification and Notations thereto are conditional upon proof being furnished of compliance with the
Construction Rules in force on the date of placing of the order, see A.1.1.
3.2 BKI reserves the right to add special remarks in the Class Certificates, as well as information regarding
operation of the ship which is of relevance for the vessel’s class.
3.3 The Certificates of Classification are issued by BKI Head Office and they are to be kept on board ship.
3.4 Certificate of Class Maintenance
3.4.1 At the request of the Owner, a certificate confirming the maintenance of class may be issued by BKI
based on information in its records for that ship at the time.
3.4.2 This certificate is issued on the assumption that the Owner has complied with the Rules, in particular
with B.2.1-2.4 and Section 3, A.1.
3.4.3 According to the same conditions as above a certificate declaring that the class is maintained ”clean
and free from recommendation” may be issued by BKI when there is no pending recommendation at that
date.
3.4.4 The Owner is liable for any damage which may be caused to any third party from improper use
documents and information in case of 2.6.2 and 2.6.3.

4. Register
4.1 General

The Classification data of each ship classified will be included in the BKI data file. An extract of these ship
data will be entered in the Register published by BKI. During the period of Class, BKI will update these details
on the basis of relevant reports submitted by the Surveyors.

5. Appeal to Head Office

In case a client does not agree on a technical decision made by or on behalf of BKI, he may, as the case may
be, send a written complaint to either Customer Relation Division (E-mail: cs@bki.co.id) or Survey Division
(E-mail: svy@bki.co.id).

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B. Validity of Class
1. Classification of ships
1.1 Class is assigned to a ship upon a survey held in order to verify whether it is eligible to be classed on
the basis of BKI Rules (see A.1.1). This may be achieved through:

1) Classification of new building ships

2) Classification of ships after construction (ship in service)

This requirement applies when an Owner applies to BKI for a ship already in service to be admitted
to class. The application will be processed differently depending on whether the ship is:

— classed with a QSCS Class Society, or

— not classed with a QSCS Class Society, or
— not classed at all.

1.2 The hull, the machinery and any special equipment classed have the same period of Class (duration of
one Class period). The class continues to be valid, provided that the hull and the machinery are subjected
to all surveys stipulated and that any repairs required are carried out to the satisfaction of BKI, see Section
3 and Section 4. For ship with Class Character A100 the validity of the Class is not exceed 5 years.

2. Prerequisites for validity of Class

2.1 The Class assigned by BKI is valid only subject to the conditions stated in the Class Certificate (e.g.
range of service, freeboard, main engine output). Class assignment is conditional upon the ship, including
her machinery, being loaded and operated such as to comply with the design concept, and with the
applicable Rules and Regulations.
This also applies to the distribution of cargo and ballast, if necessary to the securing of cargo, as well as to
the operation of the ship in heavy weather.
2.2 If the hull and/or machinery are not subjected to the prescribed surveys on their due dates, vessel’s
class will be suspended for both hull and machinery
2.2.1 The Class Certificate will become invalid and the Class will be automatically suspended in any one
of the following cases:

1) when Class Renewal Survey has not been completed or is not under attendance for completion prior
to resuming trading, by the due date, or by the expiry date of any extension granted.

2) when the Annual Survey has not been completed within 3 (three) months of the due date of the
Annual Survey, unless the vessel is under attendance for completion of the Annual Survey.

3) when the Intermediate Survey has not been completed within 3 (three) months of the due date of the
third Annual Survey in each 5-year Class Renewal Survey cycle, unless the vessel is under attendance
for completion of the Intermediate Survey.

2.2.2 The Class Certificate will become invalid and the Class may be suspended in accordance with BKI’s
suspension procedure, in any one of the following cases:

1) when the other survey required for maintenance of class (other than Annual, Intermediate and Class
Renewal survey) is not carried out by the due date and no extension has been granted.

2) when the ship is operating beyond the service limitation defined by its Class Notation and other
additional conditions as approved.

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3) When any damage to the ship is to such an extent as affecting her Class and is not repaired in
accordance with the BKI Rules, or when alterations or conversions affecting her class are carried out
without the approval of BKI.

4) when outstanding conditions of class are not deleted by the due date and no extension has been
granted.

5) when Continuous Survey items which are due or overdue at the time of Annual Surveys, are not
carried out by the due date and no extension has been granted.

6) when survey fees are not paid.

2.2.3 BKI reserves the right to suspend the class for specific period as provided separately.
2.2.4 If the survey requirements related to maintenance of additional notation are not carried out as
required, the suspension or withdrawal may be limited to those additional notation only.
2.3 BKI Head Office/Branch Office are to be immediately informed about any deficiencies or damages to
hull and machinery, where these may be of relevance to the vessel’s class. A survey will have to be arranged
immediately after vessel’s arrival at the next port. If the survey reveals that vessel’s class has been affected,
the vessel’s class will be maintained only on condition that the repairs or modifications demanded by BKI
will be carried out within the period specified by the Surveyor. Until full settlement of these conditions,
Class will be restricted, see also 4.1.
2.4 When a vessel is dual classed and in the event, that the other Class Society involved takes action to
suspend the class of the vessel for technical reasons, BKI will, upon receipt of this advice, also suspend the
class of the vessel, unless it can otherwise document that such suspension is incorrect.
2.5 Apart from the Class Certificates any other documentation of significance for Classification is to be
kept on board and made available to the Surveyor on request, such as:

— reports on surveys previously performed

— approved drawings and other documentation handed out to owners together with the Class
Certificates and containing particulars or instructions of significance in respect of the Classification
requirements (e.g. use of higher strength hull structural steel or lists of spare parts).

2.6 Reinstatement
Classification of ships will be reinstated if the cause of such suspension are removed, or upon verification
that the overdue surveys and conditions of class has been satisfactorily dealt with. BKI will reinstate class
of the ship for the following cases:

— Upon satisfactory completion of the overdue surveys. Such surveys will be credited as of the original
due date. However, the vessel is to be dis-classed from the date of suspension until the date class is
reinstated.

— Upon satisfactory completion of the overdue conditions of class. However, the vessel is removed
from class from the date of suspension until a day before the date class is reinstated.

2.7 If a ship has to be surveyed in a port beyond the reach of the Surveyor or in the events of “force
Majeure”2) , the vessel is not in a port where the overdue surveys can be completed at the expiry of the
periods allowed above, BKI may allow the vessel to sail, in class, directly to an agreed discharge port, and if
necessary, hence, in ballast, to an agreed port at which the survey will be completed, provided:

1) examination of the ship’s records is carried out by BKI;

2)
Force majeure means damage to the ship; unforeseen inability of BKI to attend the vessel due to the governmental restrictions
on right of access or movement of personnel; unforeseeable delays in port or inability to discharge cargo due to unusually lengthy
periods of severe weather, strikes or civil strife; acts of war; or other force majeure.

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2) BKI carries out the due and/or overdue surveys and examination of conditions of class at the first port
of call when there is an unforeseen inability of BKI to attend the vessel in the present port, and

3) BKI is satisfied itself that the vessel is in condition to sail for one trip to a discharge port and
subsequent ballast voyage to a repair facility if necessary. (Where there is unforeseen inability of
BKI to attend the vessel in the present port, the master is to confirm that his ship is in condition to
sail to the nearest port of call.)

The surveys to be carried out are to be based upon the survey requirements at the original due date and
not on the age of the vessel when the survey is carried out. Such surveys are to be credited from the date
originally due.
If class has already been automatically suspended in such cases, it may be reinstated subject to the
conditions prescribed above.
2.8 Vessels laid-up in accordance with BKI’s Rules prior to surveys becoming overdue need not be
suspended when surveys addressed above become overdue.
However, vessels which are laid-up after being suspended as a result of surveys going overdue, remain
suspended until the overdue surveys are completed.
2.9 When a vessel is intended for a demolition voyage with any periodical survey overdue, the vessel’s
class suspension may be held in abeyance and consideration may be given to allow the vessel to proceed
on a single direct ballast voyage from the lay up or final discharge port to the demolition yard. In such cases
a short-term Class Certificate with conditions for the voyage noted may be issued provided the attending
surveyor finds the vessel in satisfactory condition to proceed for the intended voyage.
2.10 When a vessel is intended for a single voyage from laid-up position to a repair yard or another place
of laid-up with any periodical survey overdue, the vessel’s class suspension may be held in abeyance and
consideration may be given to allow the vessel to proceed on a single direct ballast voyage from the site of
lay up to a repair yard or another place of laid-up, upon agreement with the Flag Administration, provided
BKI finds the vessel in satisfactory condition after surveys, the extent of which are to be based on surveys
overdue and duration of lay-up. A short-term Class Certificate with conditions for the intended voyage may
be issued. This is not applicable to vessels whose class was already suspended prior to being laid-up.

3. Repairs, conversions
3.1 Where parts are damaged or worn to such an extent that they no longer comply with the requirements
of BKI, they are to be repaired or replaced.
3.1.1 Any damage in association with wastage over the allowable limits (including buckling, grooving,
detachment or fracture), or extensive areas of wastage over the allowable limits, which affects or, in the
opinion of the Surveyor, will affect the vessel’s structural, watertight or weathertight integrity, is to be
promptly and thoroughly repaired. Areas to be considered include:

— side shell frames, their end attachments and adjacent shell plating,

— deck structure and deck plating,

— bottom structure and bottom plating,

— watertight or oil-tight bulkheads,

— hatch covers or hatch coamings,

— weld connection between air pipes and deck plating,

— all air pipe heads installed on the exposed decks,

— ventilators, including closing devices,

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For locations where adequate repair facilities are not available, consideration may be given to allow a vessel
to proceed directly to a repair yard. This may require discharging of the cargo and/or temporary repairs for
the intended voyage.
3.1.2 Additionally, when a survey results in the identification of structural defects or corrosion, either
of which, in the opinion of the Surveyor, will impair the vessel’s fitness for continued service, remedial
measures are to be implemented before the ship continues in service.
3.1.3 Where the damage found on structure mentioned under 3.1.1 is isolated and of a localised nature
which does not affect the ship’s structural integrity, consideration may be given by the surveyor to allow
an appropriate temporary repair to restore watertight or weather tight integrity and impose a Condition of
Class, with a specific time limit.
3.2 Maintenance work, repairs and conversions of classed ships and special equipment have to be carried
out under the supervision of BKI to ensure maintenance or reassignment of Class.
3.3 The areas affected by the repair and conversion are to be treated in the same way as new buildings,
irrespective of whether the hull, the machinery including the electrical installation, the inert gas system,
automated systems or other classed equipment are concerned, see also C.3.1.2.
3.4 If following major conversions, a new Character of Classification and/or new Notations are assigned
so that new Certificates have to be issued, commencement of a new period of Class may be agreed about.

4. Withdrawal of Class
4.1 Where hull and machinery are found to no longer comply with the requirements on which Class
assignment had been based, or where owners refuse to have repairs or modifications required by BKI carried
out within a period to be determined from case to case, vessel’s class will cease to be valid.
4.2 If owners are not interested in maintenance of, or readmission to Class of the vessel, BKI will have to
be informed accordingly. The Class Certificates will have to be returned to BKI.
4.3 If for some reason the Class has expired or has been withdrawn or suspended by BKI, this will be
indicated in the Register.
4.4 Where following withdrawal of vessel’s class the repairs required by BKI have been carried out and
the ship has been subjected to a survey for re-admission to Class, the original Class may be reassigned with
a new period of Class. Such surveys are to be carried out in accordance with the requirements stipulated
by BKI Head Office.
4.5 BKI will withdraw or cancel the Class of the ship in any one of the following cases:

— at the request of the Owner.

— when the vessel proceeds to sea without having completed conditions of class which were required
to be dealt with before leaving the port.

— when Class has been suspended for a period of 6 (six) months due to overdue Annual, Intermediate,
Special or other Surveys required for maintenance of Class or overdue outstanding conditions of class,
Class is to be withdrawn. A longer suspension period may be granted when the vessel is not trading
as in cases of lay-up, awaiting disposition in case of a casualty or attendance for reinstatement

— when the vessel is reported as a constructive total loss.

— when the vessel is reported scrapped.

4.6 Re-Classification of Ships

4.6.1 When Owners request for reclassification of a ship for which the class previously assigned has been
withdrawn, BKI will require a Re-classification Survey to be held by the Surveyors. The extent of the survey
will depend upon the age of the ship and the circumstances of each case.

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4.6.2 If the ship is found or placed in good and efficient condition in accordance with the requirements
of the Rules and Regulations at the Re-classification Survey, BKI may decide to reinstate her original class
or assign such other class as considered appropriate.
4.7 Withdrawing Class of other Class Society from a Double Class Arrangement
4.7.1 Whenever BKI being in a double class arrangement with another Society receives:

— a written request from an Owner pertaining to his intention to withdraw from class of the other
Society, or

— information that her class has been withdrawn by the other Society

The Owner is to authorize BKI to request from withdrawing Society its current class status.
BKI will notify the Owner in writing that the validity of BKI’s Class Certificate is subject:

1) For vessels less than 15 years of age, all overdue conditions of class of the withdrawing Society are to
be completed by BKI at the first port of call at which surveys can be carried out and all outstanding
conditions of class of the withdrawing Society are to be completed by the due date of the withdrawing
Society.

2) For vessels of 15 years of age and over, all overdue conditions of class of the withdrawing Society are
to be completed by the withdrawing Society and all outstanding conditions of class of the withdrawing
Society are to be completed by the due date of the withdrawing Society.

4.7.2 BKI is to suspend the validity of its Class Certificate or other documents enabling the vessel to trade,
if any overdue conditions of class previously issued against the subject vessel by the withdrawing Society
have not been satisfactorily completed by the relevant Society, depending on the age of the vessel, at the
first port of call where surveys can be carried out.
When facilities are not available in the first port of survey, a direct voyage to a port where facilities are
available may be accepted to complete surveys for overdue conditions of class of the withdrawing Society.
4.7.3 The validity of the Certificate of Class is subject to any outstanding conditions of class previously
issued against the vessel by the withdrawing Society being completed by the due date and as specified by
the withdrawing Society. Any outstanding conditions of class with their due dates are to be clearly stated
on the:

1) class survey record if available on board; and

2) survey status

4.7.4 Any additional information regarding conditions of class received from the withdrawing Society is
to be dealt with in accordance with above 4.7.2 and 4.7.3 as applicable.
If this additional information is received any conditions of class which are overdue are to be dealt with at
the first port of call at which surveys can be carried out by either BKI or relevant Society, depending on the
age of the vessel. If this is not accomplished, the Class Certificate is to be suspended immediately unless the
Owner agrees to proceed directly, without further trading, to a suitable port where any overdue conditions
of class are to be dealt with for completion.

5. Laid-up ships
5.1 A ship put out of commission may be subject to specific requirements for maintenance of class, as
specified below, provided that the Owner notifies BKI. If the Owner does not notify BKI of the laying-up of
the ship or does not implement the lay-up maintenance program, the ship’s class will be suspended and/or
withdrawn when the due surveys are not carried out by their limit.

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ACS: Annual condition survey (Annual Survey-Lay-up Condition)

AS: Annual survey (Normal Annual Survey)
Figure 2.1 The scope of the laying-up survey and annual lay-up condition surveys

5.2 The lay-up maintenance program provides for a “laying- up survey” to be performed at the beginning
of lay-up and subsequent “annual lay-up condition surveys” to be performed in lieu of the normal annual
surveys which are no longer required to be carried out as long as the ship remains laid-up. The minimum
content of the lay-up maintenance program as well as the scope of these surveys are given in Annex A.4.
The other periodical surveys which become overdue during the lay-up period may be postponed until the
re-commissioning of the ship.
5.3 Where the ship has an approved lay-up maintenance program and its period of class expires, the
period of class is extended until it is recommissioned, subject to the satisfactory completion of the annual
lay-up condition surveys.
5.4 The periodical surveys carried out during the lay-up period may be credited, either wholly or in part,
at the discretion of BKI, having particular regard to their extent and dates. These surveys will be taken into
account for the determination of the extent of surveys required for the re-commissioning of the ship and/or
the expiry dates of the next periodical surveys of the same type.
5.5 When a ship is re-commissioned, the Owner is to notify BKI and make provisions for the ship to be
submitted to the following surveys:
5.5.1 An occasional survey prior to re-commissioning, the scope of which depends on the duration of the
lay-up period
5.5.2 All periodical surveys which have been postponed in accordance with 5.2, taking into account the
provisions of 5.4.
5.6 In cases where the vessel has been laid up or has been out of service for a considerable period because
of a major repair or modification and the owner elects to carry out only the overdue surveys, the next period
of class will start from the expiry date of the class renewal survey. If the owner elects to carry out the next
Class Renewal survey due, the period of class will start from the survey completion date.
5.7 Where the previous period of class expired before the re-commissioning and was extended as stated
in 5.3, in addition to the provisions of 5.5 a complete class renewal survey is to be carried out prior to
re-commissioning. Those items which have been surveyed in compliance with the class renewal survey
requirements during the 15 months preceding the re-commissioning may be credited. A new period of
class is assigned from the completion of this class renewal survey.
5.8 The scope of the laying-up survey and annual lay-up condition surveys are described in detail in Fig.2.1
below.

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6. Laying-up survey
6.1.1 At the beginning of the lay-up period a laying-up survey is to be carried out whose scope is to verify
that the safety conditions, preservation measures, lay-up site and mooring arrangements are in accordance
with the program agreed by BKI.
6.1.2 Upon satisfactory completion of this survey, an endorsement to confirm that the ship has been
placed in lay-up is entered on the Certificate of Classification, which is subsequently to be kept on board.
6.2 Annual lay-up condition survey
6.2.1 An annual lay-up condition survey is to be performed in lieu of the normal annual class surveys. The
purpose of this survey is to ascertain that the lay-up maintenance program implemented is continuously
complied with.
6.2.2 It is to be checked that the arrangements made for the lay-up are unchanged and that the
maintenance work and tests are carried out in accordance with the maintenance manual and recorded
in the lay-up log-book.
6.2.3 Upon satisfactory completion of the survey, the Certificate of Classification is endorsed.
6.3 Re-commissioning survey
6.3.1 Owners are to make the necessary arrangements to remove the temporary lay-up installations
provided for preservation measures and the protective materials and coatings (oil, grease, inhibitors,
desiccants), before the survey is commenced.
It is the Owners’ responsibility to verify that the ship parts that are not covered by class are reactivated in
satisfactory operational condition.
6.3.2 The scope of the re-commissioning survey is to include:
1) a general examination of the hull, deck fittings, safety systems, machinery installations (including
boilers whose survey is not due) and steering gear.
2) all periodical surveys due at the date of re-commissioning or which became overdue during the lay-up
period.
3) dealing with the condition of class due at the date of recommissioning or which became due during
the lay-up period.
6.3.3 Detail item inspection in order to re-commissioning include:
For the hull the following is to be carried out:
— examination of shell plating above the waterline, deck plating, hatch covers and coamings
— examination of load line items
— overall survey of all cargo tanks/holds
— overall survey of representative ballast tanks when the lay-up period does not exceed two years
— overall survey of all ballast tanks when the lay-up period is two years and over
— overall survey of all ballast tanks when the lay-up period is two years and over
6.3.4 For the deck fittings the following is to be carried out:
— examination of fire extinguisher main pipe where possible, examination of deck piping under working
pressure
— function tests of class items
— checking inert gas installation under working condition after inspection of water seal and function
test of deck non-return valve and pressure/vacuum valves.

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6.3.5 For machinery installations the following is to be checked:

— the analysis of lubricating oil of main engines, auxiliary engines, reduction gears, main thrust bearings
and stern tube

— the general condition of crankcase, crankshaft, piston rods and connecting rods of diesel engines

— the crankshaft deflections of diesel engines. In addition, when engines have been laid-up for more
than two years, one piston is to be disconnected and one liner is to be removed for examination.
Dismantling is to be extended if deemed necessary

— the condition of blades of turbines through the inspection doors

— the condition of the water side of condensers and heat exchangers

— the condition of expansion arrangements

— the condition of reduction gears through the inspection doors

— the condition after overhauling of pressure relief devices

— the test of bilge level alarms, when fitted.

6.3.6 The main and emergency electrical installations are to be tested. The parallel shedding of main
generators and main switchboard safety devices are to be checked. A megger test of the electrical
installation is to be performed.
6.3.7 For the fire prevention, detection and fire-fighting systems, the following is to be examined and/or
tested:

— remote control to quickly close FO valve, to stop FO pump and ventilation system, to close fire door
and watertight door

— fire detectors and alarms.

— fire-fighting equipment

6.3.8 The automated installation is to be checked for proper operation.

6.3.9 When classed, the installations for refrigerated cargo are to be examined under working conditions.
Where the lay-up period exceeds two years, representative components of the installation are to be
dismantled.
6.3.10 For cargo installations on liquefied gas carriers, the following is to be carried out:

— inspection of the primary barrier in tanks

— for membrane tanks, a global gas test of tanks whose results are to be compared with those obtained
at ship’s delivery

— testing of gas piping at working pressure using inert gas.

BKI Surveyor is to attend the first cooling down and loading of the ship.
6.3.11 For other specific classed installations, the Owners are to submit a survey program to BKI.

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6.3.12 On completion of the above surveys and tests, sea trials are to be performed in the presence of a
Surveyor of BKI. The sea trials are to include:

— verification of the satisfactory performance of the deck installations, main propulsion system and
essential auxiliaries, including a test of the safety devices

— an anchoring test

— complete tests of steering gear

— full head and full astern tests

— tests of automated machinery systems, where applicable

6.3.13 Upon satisfactory completion of the surveys, an endorsement to confirm the carrying out of all
relevant surveys and the re-commissioning of the ship is entered on the Certificate of Classification.

C. Classification of New building ships

The hull survey for Classification of new building ships is to be in accordance with Annex A.2.

1. Application for Classification

1.1 The application for Classification is to be submitted to BKI by the Shipbuilder or the Owner. The
application has to be given by the client, who on the basis of the building contract has the duty to observe
the Rules of BKI.
1.2 Where application for the production of components are placed with subcontractors, BKI should be
advised about it, also indicating the scope of production. The client will be responsible for observance of
the BKI Rules by the subcontractors.
1.3 Where the application considers particulars already having been approved by BKI (for previous
new buildings) to be used for the Classification, this will have to be specifically stated in the application.
Amendments to the Construction Rules having been introduced meanwhile shall be taken into account,
see A.1.1.

2. Examination of construction particulars

2.1 Particulars for examination (such as construction plans, proofs by computation, details on materials,
etc.) are to be submitted electronically for examination in due time prior to commencement of construction
as detailed in the Construction Rules.
The particulars to be submitted in Bahasa Indonesia or English have to contain all details required for
examination in accordance with the Construction Rules. BKI reserves the right to request additional
information and particulars to be submitted.
2.2 The particulars and drawings to be submitted, of components subject to approval, will be examined
by BKI. Where applicable, they will be provided with a mark of approval and returned in one copy.
2.3 Any deviations from approved drawings require to be approved by BKI prior to being realized.

3. Supervision of construction and trials

3.1 General
3.1.1 BKI will assess the production facilities and procedures of the shipyard and other manufacturers
as to whether they meet the requirements of the Construction Rules. In general, approvals based on such
assessments are conditional for acceptance of products subject to testing.

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3.1.2 Materials, components, appliances and installations subject to inspection are to comply with
the relevant Rule requirements and be presented for inspection and/or construction supervision by BKI
Surveyors, unless otherwise provided as a result of special approvals granted by BKI.
New installation of materials which contain asbestos, e.g. materials used for hull structure, machinery,
electrical installations and equipment, is not permitted for all new and existing ships.
3.1.3 For each inspection, an appointment is to be arranged in time with the BKI Branch Office.
3.1.4 In order to enable the Surveyor to fulfil his duties, he is to be given free access to the ship and the
workshop, where parts requiring approval are manufactured, assembled or tested. For performance of the
tests required, the shipyard or manufacturers are to give the Surveyor assistance by providing the staff and
equipment necessary for such tests.

3.2 Supervision of Construction

During the phase of construction of a vessel or installation, BKI will satisfy themselves by surveys and
inspections that:

— parts for hull and machinery requiring approval have been constructed in compliance with the
approved drawings and particulars

— all tests and trials stipulated by the Construction Rules are performed satisfactorily

— workmanship is in compliance with current engineering standards and/or Rule requirements

— welded parts are produced by qualified welders having undergone tests

— test certificates have been presented for components requiring approval (the Shipyard will have to
ensure that any parts and materials requiring approval will only be delivered and installed, if the
appropriate test certificates have been issued, see 4.1.

— where no individual certificates are required, type-tested appliances and equipment are employed
in accordance with rule requirements

3.3 Tests at the manufacturers

As far as practicable, machinery and equipment will be subjected to operational trials on the manufacturers’
test bed to the scope specified in the Construction Rules. This applies also to engines produced in
large series. Where the machinery, equipment or electrical installations are novel in design or have not
yet sufficiently proved their efficiency under actual service conditions on board ship, BKI may require
performance of a trial under particularly severe conditions.
For refrigerating installations, see 3.5.

3.4 Shipboard trials

Upon completion of the ship and/or the system / equipment to be classed, all hull, machinery and electrical
installations will be subjected to operational trials in the presence of the Surveyor, prior to and during the
sea trial. This will comprise e. g.:

— tightness, operational and load tests of tanks, hatch covers, shell ports, ramps, etc.

— operational and/or load tests of the machinery and installations (propulsion plant, electrical
installations, steering gear, anchor equipment, etc.) of importance for safe operation

During a final survey, checks will be made to ensure that any deficiencies found, for instance during the sea
trial, have been eliminated

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3.5 Refrigerating installations

3.5.1 Refrigerating machines are to be subjected to operational tests at the manufacturers.
3.5.2 Fitting of the refrigerating installation will be supervised by the Surveyor, who will examine the
workmanship and perform the prescribed tightness and operational tests.
3.5.3 Upon completion the entire installation will be subjected to operational trials in accordance with
the requirements of the Construction Rules.
3.5.4 For refrigerating installations deviating in design from installations in common use, BKI reserves the
right to require additional tests to be performed.

4. Reports, certificates
4.1 Testing of materials, components, machinery, etc. at subcontractor’s works will be certified by the
Surveyor and/or the local BKI representation.
4.2 Upon completion of the ship or installation the Surveyors will prepare construction reports, on the
basis of which BKI will issue the Class Certificate, see A.3.

5. Workmanship
5.1 General
5.1.1 Requirements to be complied with by the manufacturer
1) The manufacturing plant shall be provided with suitable equipment and facilities to enable proper
handling of the materials, manufacturing processes, structural components, etc. BKI reserve the right
to inspect the plant accordingly or to restrict the scope of manufacture to the potential available at
the plant.

2) The manufacturing plant shall have at its disposal sufficiently qualified personnel. BKI is to be advised
of the names and areas of responsibility of all supervisory and control personnel. BKI reserve the right
to require proof of qualification.

5.1.2 Quality control

1) As far as required and expedient, the manufacturer’s personnel have to examine all structural
components both during manufacture and on completion, to ensure that they are complete, that
the dimensions are correct and that workmanship is satisfactory and meets the standard of good
shipbuilding practice.

2) Upon inspection and corrections by the manufacturing plant, the structural components are to be
shown to the BKI Surveyor for inspection, in suitable sections, normally in unpainted condition and
enabling proper access for inspection.

3) The Surveyor may reject components that have not been adequately checked by the plant and may
demand their re-submission upon successful completion of such checks and corrections by the plant.

D. Classification of Ships after construction (ship in service)

1. General
1.1 Application
1.1.1 When an Owner applies to BKI for a ship already in service to be admitted to class, the application
will be processed differently depending on whether the ship is:

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1) classed with a classification society subject to verification of compliance with QSCS, and reported as
compliant 3) by this classification society, or

Note:
Term of “this classification society” refer to losing Society in case of transfer of class or first class in case
of addition to class.

2) non-compliant 4) ship, or

3) not classed at all.

For point 1) above, see requirements as given in 2. to 5. whichever is applicable. For point 2) and 3) above,
see requirements as given in 6.

2. Transfer of ship in service classed by another classification society subject to verification of

compliance with IACS QSCS and reported as compliant (IACS PR 1A)
2.1 Documentation to be submitted
2.1.1 The following particulars and/or drawings are to be submitted to BKI:

1) Main plans :

A) General Arrangement
B) Capacity Plan
C) Hydrostatic Curves/Tables
D) Loading Manual, where required
E) Damage Stability calculation, where required

2) Steel plans:

A) Midship Section
B) Scantling Plan
C) Decks
D) Shell Expansion
E) Transverse Bulkheads
F) Rudder and Rudder Stock
G) Hatch Covers
H) For CSR vessels, plans showing, for each structural element, both as-built and renewal
thicknesses and any thickness for “voluntary addition”.

3) Machinery plans:

A) Machinery Arrangement
B) Intermediate, Thrust and Screw Shafts
C) Propeller
D) Main Engines, Propulsion Gears and Clutch Systems (or Manufacturer make, model and rating
information)
3)
‘Compliant’ ship means a ship classed with a Classification Society subject to verification of compliance with QSCS and in full
compliance with all applicable and relevant IACS Resolutions.
4)
‘Non-compliant’ ship means a ship either not classed with a Classification Society subject to verification of compliance with
QSCS or not in full compliance with all applicable and relevant IACS Resolutions.

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E) For Steam Turbine Vessels, Main Boilers, Superheaters and Economisers (or Manufacturer make,
model and rating information) and Steam Piping
F) Bilge and Ballast Piping Diagram
G) Wiring Diagram
H) Steering Gear Systems Piping and Arrangements and Steering Gear Manufacturer make and
model information
I) For vessels less than two (2) years old, torsional vibration calculations are to be submitted.
J) Additional plans required for unattended machinery space notation:
a) Instrument and Alarm List
b) Fire Alarm System
c) List of Automatic Safety Functions (e.g. slowdowns, shutdowns, etc.)
d) Function Testing Plan.

4) Additional requirements for vessels with ice class notation:

A) Plans for flexible couplings and/or torque limiting shafting devices in the propulsion line shafting
(or manufacturer make, model and rating information) are to be submitted.

5) Additional plans required for oil tankers:

A) Pumping arrangement at the forward and after ends and drainage of cofferdams and pump
rooms are to be submitted.

6) Additional plans required for Ro-Ro ship:

A) Operating and Maintenance Manual (OMM), if required

2.1.2 Alternative technical data may be accepted by BKI in lieu of specific items of the listed
documentation not being available at the time of the transfer.

2.2 Class entry survey

2.2.1 For Admission to Class the extent of the Class entry survey for the hull and machinery installation
will be specially determined by BKI depending on the vessel’s age and type. If the result of the survey is
satisfactory, the Class of BKI will be effective as of the date of performance of the concluded survey.
2.2.2 Class entry surveys may be, but are not required to be, credited as periodical surveys for
maintenance of classification. Conditions of class due for compliance at a specified periodical survey for
maintenance of classification need not be carried out/complied with at a Class entry survey unless the Class
entry survey is credited as the specified periodical survey for maintenance of classification or the conditions
of class is overdue.
2.2.3 Notwithstanding the records indicating that all surveys are up-to-date, a Class entry survey is to be
held as minimum technical requirements by BKI, the extent of which is to be based on the age of the vessel
and the losing Society’s class status as follows:

A) Hull Classification Survey:

a) for vessels of age less than 5 years the survey is to take the form of an Annual Survey;
b) for vessels between 5 and 10 years of age the survey is to include an Annual Survey and
inspection of a representative number of ballast spaces;
c) for vessels of 10 years of age and above but less than 20 years of age, the survey is to include an
Annual Survey and inspection of a representative number of ballast spaces and cargo spaces.
For gas carriers, in lieu of internal inspection of cargo spaces, the following applies except for :

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i) Inspection of surrounding ballast tank(s) and void spaces including external inspection of
independent cargo tank(s) and associated supporting systems as far as possible;
ii) Review of cargo log books and operational records to verify the correct functioning of the
cargo containment system.
For chemical carriersoil tankers (including product carriers), and chemical tankers of 10 years of
age and above but less than 15 years of age, in lieu of an internal inspection of cargo tanks
without internal stiffening and framing, inspections of surrounding ballast tank(s) and void
spaces and deck structure, are to be applied.
d) for vessels subject to ESP notation which are 15 years of age and above but less than 20 years
of age, the survey is to have the scope of a Class Renewal Survey or an Intermediate Survey,
whichever is due next;
e) for all vessels, which are 20 years of age and above, the survey is to have the scope of a Class
Renewal Survey;
f) in the context of applying items d) and e) above, if a dry-docking of the vessel is not due at the
time of transfer, consideration can be given to carrying out an underwater examination in lieu
of dry-docking.
g) in the context of applying items d) and e), as applicable, the anchors and anchor chain cables
ranging and gauging for vessels over 15 years of age is not required to be carried out as part of
the Classification Survey unless the Classification Survey is being credited as a periodical survey
for maintenance of class. If the classification survey is to be credited as a periodical survey for
maintenance of class, consideration may be given by BKI to the acceptance of the anchors and
anchor chain cables ranging and gauging carried out by the losing society provided they were
carried out within the applicable survey window of the periodical survey in question.
h) in the context of applying items a) to f) above, as applicable,
i) if the class entry survey is to be credited as a periodical survey for maintenance of class
consideration may be given by BKI to the acceptance of thickness measurements taken by
the losing society provided they were carried out within the applicable survey window of
the periodical survey in question.
ii) if the Classification Survey is not to be credited as a periodical survey for maintenance of
class, consideration may be given by BKI to the acceptance of thickness measurements
taken by the losing society provided they were carried out within 15 months prior to
completion of classification survey when it is in the scope of a Class Renewal Survey,
within 18 months prior to completion of class entry survey when it is in the scope of an
Intermediate Survey.

In both cases, the thickness measurements are to be reviewed by BKI for compliance
with the applicable survey requirements, and confirmatory gauging are to be taken to the
satisfaction of BKI.
i) In the context of applying c) to f) above, as applicable, tank testing for vessels over 15 years
of age is not required to be carried out as part of the Class entry survey unless the Class entry
survey is being credited as a periodical survey for maintenance of class. If the classification
survey is to be credited as a periodical survey for maintenance of class, consideration may be
given by BKI to the acceptance of the tank testing carried out by the losing society provided they
were carried out within the applicable survey window of the periodical survey in question.
j) In the context of applying a) to f) above, as applicable, compliance with IACS Unified
Requirements that require compliance at the forthcoming due periodical surveys (such as S26
and S27) are not required to be carried out/completed as part of the Class entry survey unless
the class entry survey is credited as a periodical survey for maintenance of class.
B) Machinery Class Entry Survey

A general examination of all essential machinery is to be held and is to include:

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a) examination under working conditions of oil fuel burning equipment of boiler, economisers and
steam/steam generators. The adjustment of safety valves of this equipment is to be verified by
checking the records on the vessel;
b) all pressure vessels;
c) insulation resistance, generator circuit breakers, preference tripping relays and generator prime
mover governors are to be tested and paralleling and load sharing to be proved (see Note 1);
d) in all cases, navigating lights and indicators are to be examined and their working and alternative
sources of power verified;
e) bilge pumps, emergency fire pumps and remote control for oil valves, oil fuel pumps, lubricating
oil pumps and forced draught fans are to be examined under working conditions;
f) recirculating and ice clearing arrangements, if any;
g) the main and all auxiliary machinery necessary for operation of the vessel at sea together with
essential controls and steering gear is to be tested under working conditions. Alternative means
of steering are to be tested. A short sea trial is to be held at the Surveyors discretion if the vessel
has been laid up for a long period;
h) initial start arrangements are to be verified;
i) in the case of oil tankers, the cargo oil system and electrical installation in way of hazardous
spaces are to be checked for compliance with the BKI’s Rule requirements. Where intrinsically
safe equipment is installed, the Surveyors are to satisfy themselves that a recognised authority
has approved such equipment. The safety devices, alarms and essential instruments of the
inert gas system are to be verified and the plant generally examined to ensure that it does not
constitute a hazard to the vessel (see Note 1).

Note 1:
For the transfer of class or adding class at ship’s delivery, items listed in c) and i) may be verified by
reviewing the ship’s records.

2.3 Condition of IACS PR 01A for the issuance of Interim Certificate of Class
2.3.1 This Requirement is applicable, unless stated otherwise, to ships of over 100 GT of whatever type,
selfpropelled or not, restricted or unrestricted navigation, except for ”inland waterway” ships.
2.3.2 The age of the ship considered in the procedure for transfer of class is the age calculated from the
date of delivery to the date request for class was received.
2.3.3 The obligations of this requirement continue to apply when a ship’s class is suspended by the losing
Society and for 6 months following withdrawal of a ship’s class by the losing Society.
2.3.4 As the ship may be laid up, BKI is to check the classification status from the previous Society in order
to verify if requirements in 2. are applicable.
2.3.5 Cases concerning ships of 100 GT or less are dealt with by BKI on a case-by-case basis.
2.3.6 Whenever BKI is requested by an Owner to accept an existing vessel into class, the following applies:

1) the relevant surveys specified in 2.2 are required to be satisfactorily completed for entry into class;

2) for vessels less than 15 years of age, an Interim Certificate of Class can be issued only after the gaining
Society has completed: (i) all overdue surveys and (ii) all overdue recommendations/ conditions of
class previously issued against the vessel as specified to the Owner by the losing Society. See also
2.3.2;

3) for vessels 15 years of age and over, an Interim Certificate of Class can be issued only after the losing
Society has completed: (i) all overdue surveys and (ii) all overdue recommendations/ conditions of
class previously issued against the vessel. See also 2.3.2;

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4) any outstanding recommendations / conditions of class are to be dealt with by their due dates;

5) the principles given in items 1), 2) and 3) above apply to any additional conditions of class issued
against the vessel arising from surveys which were not included in the initial survey status provided
to BKI by the losing Society because the surveys were carried out in close proximity to the request
for transfer of class. Such additional conditions of class if received after the issuance of the Interim
Certificate of Class by BKI and which are overdue are to be dealt with at the first port of call by the
relevant Society depending on the age of the vessel;

6) copies of the plans listed in 2.1 are to be provided to BKI as a prerequisite to obtaining a full term
Class Certificate.

If the Owner is unable to provide all of the required plans, BKI is to request that the Owner authorise the
losing Society to transfer copies of such of these plans as it may possess directly to BKI upon request from
BKI, with the advice that the losing Society will invoice BKI and BKI may, in turn, charge the associated costs
to the Owner.
2.3.7 Prior to issuing an Interim Certificate of Class, BKI is to obtain:

— from the Owner, a written request for transfer of class, containing an authorisation for BKI to obtain
the current classification status from the losing Society; and

— the current class survey status from the Headquarters of the losing Society or one of its designated
control or management centres.

2.3.8 BKI cannot issue an Interim Certificate of Class, or other documents enabling the ship to trade:

1) until all overdue surveys and all overdue conditions of class previously issued against the subject ship,
as specified to the Owner by the losing Society, have been completed and rectified either by:

a) BKI for ships less than 15 years of age or

b) by the losing Society for ships 15 years of age and above;

2) until all relevant surveys specified in 2.2, have been satisfactorily completed;

3) when facilities are not available in the first port of survey, an Interim Certificate of Class may be issued
to allow the ship to undertake a direct voyage to a port where facilities are available to complete
surveys required in 2.2. In such cases the surveys specified in 2.2 are to be carried out to the maximum
extent practicable at the first port of survey, but in no case less than the scope of annual hull surveys,
and machinery surveys as required in 2.2.3.B).

4) before giving the opportunity to the Administration to provide any further instructions.

2.4 Limitation of IACS PR 01A for the Interim Certificate of Class

2.4.1 The validity of the Interim Certificate of Class and the subsequent Certificate of Class is subject to
any outstanding conditions of class previously issued against the ship being completed by the due date and
as specified by the losing Society. Any outstanding conditions of class with their due dates are stated on
the Survey endorsement sheets and ship status when the full term Certificate of Class is issued.
2.4.2 If additional information regarding outstanding surveys or conditions of class is received from the
losing Society after the Interim Certificate of Class has been issued, any surveys or conditions of class which
are overdue are to be dealt with at the first port of call:

— by BKI for ships less than 15 years of age, or

— by the losing Society for ships 15 years of age or over.

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If this is not accomplished, the Interim Certificate of Class is withdrawn immediately unless the Owner
agrees to proceed directly, without further trading, to a suitable port where any overdue surveys or overdue
conditions of class are to be carried out by the relevant Society based on the age of the ship.
Note
Additional information as stated in 2.4.2 means outstanding survey and/or condition of class arising
from survey which were not included in the initial status provided to BKI by the losing society because
the surveys were carried out in close proximity to the request for transfer of class. This may occur if there
was/were survey reports outstanding by losing society.

Although not included in in 2.4.2, information such structural diminution allowances are to be
considered as additional information if not provided to BKI by losing society in initial status.

2.5 Certificate of Class

2.5.1 Upon satisfactory review of the survey reports, BKI issues to the Owner the Certificate of Class valid
for the whole period of class, provided that the conditions in 2.1 to 2.4 are met. The certificate indicates
the class notations.

3. Transfer of ship’s classed by another classification society subject to verification of compliance with
IACS QSCS at Ships delivery and reported as compliant (IACS PR 1A)
3.1 Documentation to be submitted
3.1.1 The requirements of 2.1 apply.

3.2 Class entry survey

3.2.1 Class entry survey is to be held by BKI with the extent of an annual survey as minimum.

3.3 Condition of IACS PR 01A for the issuance of Interim Certificate of Class
3.3.1 This requirement applies to transfer of class (T.o.C) from one QSCS Class Society into BKI at ship’s
delivery 5) and applicable when losing society (which has carried out the new construction technical review
and surveys) has issued its first Certificate of Class 6) .
3.3.2 This requirement is applicable, unless stated otherwise, to ships of over 100 GT of whatever type,
self-propelled or not, restricted or unrestricted navigation, except for ”inland waterway” ships.
3.3.3 The obligations of this requirement continue to apply when a ship’s class is suspended by the losing
Society and for 6 months following withdrawal of a ship’s class by the losing Society.
3.3.4 As the ship may be laid up, BKI is to check the classification status from the previous Society in order
to verify if requirements in 3. are applicable.
3.3.5 Cases concerning ships of 100 GT or less are dealt with by BKI on a case-by-case basis.
3.3.6 Whenever BKI is requested by an Owner to accept a vessel into its class at its delivery, the following
applies:

1) any outstanding recommendations / conditions of class are to be dealt with by their due dates;

2) copies of the plans listed in 2.1 are to be provided to BKI as a prerequisite to obtaining a Full Term
Certificate of Class.
5)
“At ship’s delivery” means that the new construction survey process is completed and the ship has not departed from the
yard.
6)
“First Certificate of Class” means either the Interim Certificate of Classification or full term Certificate

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If the Owner is unable to provide all of the required plans, BKI is to request that the Owner authorise the
losing Society to transfer copies of such of these plans as it may possess directly to BKI upon request from
BKI, with the advice that the losing Society will invoice BKI and BKI may, in turn, charge the associated costs
to the Owner.
3.3.7 Prior to issuing an Interim Certificate of Class on the date of the vessel’s delivery, BKI is to obtain:

1) from the Owner, a written request for transfer of class at vessel’s delivery, containing an authorisation
for BKI to obtain a copy of the first Certificate of Class, from the losing Society; and

2) the first Certificate of Class from the Headquarters of the losing Society or one of its designated
control or management centres or from the attending Surveyor at the yard of the builder including
any outstanding conditions of class and information normally contained in the classification status.

3.3.8 BKI can not issue an Interim Certificate of Class, or other documents enabling the vessel to trade:

1) until the Class entry survey with the extent of an annual survey as minimum, have been satisfactorily
completed,

2) before giving the opportunity to the Administration to provide any further instructions.

3.4 Limitation of IACS PR 01A for the Interim Certificate of Class

3.4.1 The validity of the Interim Certificate of Class and the subsequent full term Certificate of Class issued
by BKI is subject to any outstanding conditions of class previously issued against the ship being completed
by the due dates and as specified by the losing Society. Any outstanding conditions of class with their due
dates are stated on the Survey endorsement sheets and ship status when the full term Certificate of Class
is issued.

3.5 Certificate of Class

3.5.1 Upon satisfactory review of the survey reports, BKI issues to the Owner the Certificate of Class valid
for the whole period of class, provided that the conditions in 3.1 to 3.4 are met. The certificate indicates
the class notations.

4. Addition of BKI’s class to ship in service classed by another classification society subject to verification
of compliance with IACS QSCS and reported as compliant (IACS PR 1B)
4.1 Documentation to be submitted
4.1.1 The requirements of 2.1 apply.

4.2 Class entry survey

4.2.1 Class entry survey is to be held by BKI with the extent as follows:

1) for double class: requirements of 2.2 apply taking account of the conditions of class in the status
provided by the first Society;

2) for dual class: annual survey as a minimum

4.3 Condition of IACS PR 01B for the issuance of Interim Certificate of Class
4.3.1 This requirement is applicable, unless stated otherwise, to ships of over 100 GT of whatever type,
selfpropelled or not, restricted or unrestricted navigation, except for ”inland waterway” ships.
4.3.2 The obligations of this requirement continue to apply when a ship’s class is suspended by the
withdrawal Society and for 6 months following withdrawal of a ship’s class by the withdrawal Society.

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4.3.3 Cases concerning ships of 100 GT or less are dealt with by BKI on a case-by-case basis.
4.3.4 Whenever BKI is requested by an Owner to accept an existing vessel already classed by another
classification society subject to verification of compliance with IACS QSCS into its class under double or
dual class arrangement, the following applies:
1) BKI only accepts a vessel that is free from any overdue surveys or conditions of class;

2) the Owner is to inform first Society of his request to BKI;

3) the Owner is to authorise first Society to submit to BKI its current class status and documents as listed
below, for information and use by BKI in conducting its class entry surveys;

A) Damages *
B) Major repairs / rectifications *
C) Conversion of hull-dates *
D) Major alterations of machinery installation-dates *
E) Condition evaluation / hull summary report if applicable
F) History of conditions of class *
G) Thickness measurements from last Class Renewal Survey and subsequent thickness
measurements, including areas with substantial corrosion
H) Report of last Class Renewal Survey and subsequent periodical reports
I) Information on coating condition of water ballast tanks (including non ESP vessels) *
J) Restrictions / limitations in navigation area
K) Optional photos when available

* As retained by the first Society

4) when the Owner decides to leave the double or dual class arrangement and prior to withdrawing
from the class of one of two Societies, the Owner is to inform BKI of his intended actions;

5) when the Owner is advised that one of the Societies involved in double or dual class arrangement
suspends or withdraws class, the Owner is to inform the remaining Society of the action taken by the
other Society without delay;

6) copies of the plans listed in 2.1 are to be provided to BKI as a prerequisite to obtaining a full term
Class Certificate. If the Owner is unable to provide all of the required plans, BKI is to request that the
Owner authorise the first Society to transfer copies of such of these plans as it may possess directly
to BKI upon request from BKI.
4.3.5 Prior to issuing an Interim Certificate of Class, BKI is to:
1) obtain from the Owner, a written application for entry into BKI class, containing an authorisation for
BKI to obtain the current classification status from the first Society;

2) obtain the current classification survey status from the Headquarters of the first Society or one of its
designated control or management centres;

3) carry out and satisfactorily complete all relevant class entry survey as required in 4.2.

4.4 Limitation of IACS PR 01B for the Interim Certificate of Class

4.4.1 The validity of the Interim Certificate of Class and the subsequent Certificate of Class is subject to
any outstanding conditions of class previously issued against the ship being completed by the due dates
and as specified by the first Society. Any outstanding conditions of class with their due dates are stated on
the Survey Endorsement Sheets and ship status when the full term Certificate of Class is issued.

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4.5 Certificate of Class

4.5.1 Upon satisfactory review of the survey reports, BKI issues to the Owner the Certificate of
Classification valid for the whole period of class, provided that the conditions in 4.1 to 4.4 are met. The
certificate indicates the class notations.

5. Addition of BKI’s class to ship classed by another classification society subject to verification of
compliance with IACS QSCS at the ship’s delivery and reported as compliant (IACS PR 1B)
5.1 Documentation to be submitted
5.1.1 The requirements of 2.1 apply.

5.2 Class entry survey

5.2.1 Class entry survey is to be held by BKI with the extent of annual survey as a minimum.

5.3 Condition of IACS PR 01B for the issuance of Interim Certificate of Class

5.3.1 This requirement applies for adding a BKI class at ship’s delivery 5) and applicable when the society
(which has carried out the new construction technical review and surveys) has issued its first Certificate of
Class 6) .
5.3.2 This requirement is applicable, unless stated otherwise, to ships of over 100 GT of whatever type,
selfpropelled or not, restricted or unrestricted navigation, except for ”inland waterway” ships.
5.3.3 The obligations of this requirement continue to apply when a ship’s class is suspended by the
withdrawal Society and for 6 months following withdrawal of a ship’s class by the withdrawal Society.
5.3.4 Cases concerning ships of 100 GT or less are dealt with by BKI on a case-by-case basis
5.3.5 Whenever BKI is requested by an Owner to accept an vessel already classed by another classification
society subject to verification of compliance with IACS QSCS into its class under double or dual class
arrangement at its delivery, the following applies:
1) the Owner is to inform first Society of his request to BKI;
2) the Owner is to authorise first Society to submit to BKI its Certificate of Class;
3) when the Owner decides to leave the double or dual class arrangement and prior to withdrawing
from the class of one of two Societies the Owner is to inform BKI of his intended actions;
4) when the Owner is advised that one of the Societies involved in double or dual class arrangement
suspends or withdraws class, the Owner is to inform the remaining Society of the action taken by the
other Society without delay;
5) copies of the plans listed in 2.1 are to be provided to BKI as a prerequisite to obtaining a full term
Class Certificate. If the Owner is unable to provide all of the required plans, BKI is to request that the
Owner authorise the first Society to transfer copies of such of these plans as it may possess directly
to BKI upon request from BKI.
5.3.6 Prior to issuing an Interim Certificate of Class, BKI is to:
1) obtain from the Owner, a written application for entry into BKI class, containing an authorisation for
BKI to obtain the copy of first Certificate of Class from the first Society;
2) obtain the first Certificate of Class from the Headquarters of the first Society or one of its designated
control or management centres or from the attending Surveyor at the yard of the builders, including
any outstanding conditions of class and information normally contained in the classification status;
3) carry out and satisfactorily complete all relevant class entry survey as required in 5.2.

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5.4 Limitation of IACS PR 01B for the Interim Certificate of Class

5.4.1 Prior to final entry into BKI class, BKI is obligated to obtain plans and information in accordance
with the requirements of 2.1.

5.5 Certificate of Class

5.5.1 Upon satisfactory review of the survey reports, BKI issues to the Owner the Certificate of Class valid
for the whole period of class, provided that the conditions in 5.1 to 5.4 are met. The certificate indicates
the class notations.

6. Ships in service not classed at all or class entry of non-compliant 4) ships (IACS PR 1D)
6.1 Documentation to be submitted
The following particulars and/or drawings are to be submitted:

1) Main plans :

A) General Arrangement
B) Capacity Plan
C) Hydrostatic Curves/Tables
D) Loading Manual, where required
E) Damage Stability calculation, where required

2) Steel plans:

A) Midship Section
B) Scantling Plan
C) Decks
D) Shell Expansion
E) Transverse Bulkheads
F) Rudder and Rudder Stock
G) Hatch Covers
H) Stern frame

3) Machinery plans:

A) Machinery Arrangement
B) Shafting arrangement, i.e. Intermediate, Thrust and Screw Shafts
C) Propeller
D) Main Engines, Propulsion Gears and Clutch Systems (or Manufacturer make, model and rating
information)
E) For Steam Turbine Vessels, Main Boilers, Superheaters and Economisers (or Manufacturer make,
model and rating information) and Steam Piping
F) Bilge and Ballast Piping Diagram
G) Wiring Diagram
H) Steering Gear Systems Piping and Arrangements and Steering Gear Manufacturer make and
model information
I) For vessels less than two (2) years old, torsional vibration calculations are to be submitted.
J) Additional plans required for unattended machinery space notation:

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a) Instrument and Alarm List

b) Fire Alarm System
c) List of Automatic Safety Functions (e.g. slowdowns, shutdowns, etc.)
d) Function Testing Plan.

4) Additional requirements for vessels with ice class notation:

A) Plans for flexible couplings and/or torque limiting shafting devices in the propulsion line shafting
(or manufacturer make, model and rating information) are to be submitted.

5) Additional plans required for oil tankers:

A) Pumping arrangement at the forward and after ends and drainage of cofferdams and pump
rooms are to be submitted.

6) Additional plans required for Ro-Ro ship:

A) Operating and Maintenance Manual (OMM), if required

Additional information may be necessary according to Flag State requirements.

Alternative technical data may be accepted by BKI in lieu of specific items of the listed documentation not
available at the time of the transfer of class.

6.2 Class entry survey

6.2.1 A Class entry survey is to be carried out by BKI, the minimum extent of which is to be based on the
age and type of the vessel as follows:

1) Class Renewal Survey of Hull and Machinery including thickness measurements,

2) Dry docking Survey,

3) Tail-shaft Survey(s),

4) Boiler Survey(s) and Pressure vessel survey(s).

6.2.2 BKI may request further examinations, tests and measurements, including but not limited to
material testing, non-destructive testing, hydraulic and hydrostatic tests and sea trial.
6.2.3 Where during any portion of the 5 (five) years prior to the request for classification being received,
the vessel has been previously classed by BKI or a Society subject to verification of compliance with QSCS
and has not been subject to alteration or modification since class was withdrawn, the survey requirements
may be specially considered but are not to be less than the following:

1) For vessels previously classed with BKI – all overdue surveys and overdue conditions of class, or

2) For vessels previously classed with a Society subject to verification of compliance with QSCS – surveys
the same as those required by 2.2.

6.3 Condition of IACS PR 01D for the issuance of Interim Certificate of Class
6.3.1 This provision (refer to IACS PR 01D) contains procedures and requirements pertaining to class entry
of ships not subject to PR 1A or PR 1B and is applicable, unless stated otherwise, to vessels of over 100 GT
of whatever type, self-propelled or not, restricted or unrestricted service, except for ”inland waterway”
vessels.
6.3.2 Cases concerning ships of 100 GT or less are dealt with by BKI on a case-by-case basis.

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6.3.3 Prior to issuing an Interim Certificate of Class BKI is to obtain a written request for classing the vessel
from the owner.
6.3.4 BKI is not to issue an Interim Certificate of Class, or other documents enabling the vessel to trade
under its classification:

1) until all required surveys as required in 6.2 have been completed;

2) until the appraisal of the plans listed in 6.1, as required by BKI to verify compliance with its applicable
class Rules, has been carried out;

3) where issues remain outstanding, BKI may impose a conditions of class for a limited time period in
accordance with Section 3, A.3.7.

4) before giving the opportunity to the Administration to provide any further instruction.

6.4 Certificate of Class

6.4.1 Upon satisfactory review of the survey reports, BKI issues to the Owner the Certificate of Class valid
for the whole period of class, provided that the conditions in 6.1 to 6.3 are met. The certificate indicates
the class notations.

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Section 3 Surveys – General Requirements

A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
B. Surveys for Maintenance of Class . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
C. Periodic Survey of Fuel Installations on Ships other than Liquefied Gas Carriers
utilizing gas or other low flash point fuels . . . . . . . . . . . . . . . . . . . . . . 3-55
D. Thickness Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59

A. General Information
1. Surveys for Maintenance of Class
1.1 For maintenance of the Class, the regular periodical and non-periodical surveys of hull, machinery,
including electrical installation, defined below have to be performed, see also Section 2, B.
Other surveys performed by BKI are listed in Section 4.
1.2 Surveys required for maintenance of the Class, e.g. in the case of repairs of, or modifications to any
parts subject to Classification, are to be agreed with the BKI in due time, so that the measures envisaged
may be assessed and supervised, as required.
1.2.1 The surveys conducted by BKI may be subject to Audit by an independent Accredited Certification
Body (ACB) as per the requirements of ISO 9001:2008 standard and Quality Management System
Certification Scheme (QSCS) of IACS.
1.3 The Surveyors are to be given access at any time to the ship and/or to the workshops, so that they
may perform their duties. For the purpose of audit by ACB, ACB auditors are to be given the necessary
access to the ship, shipyard or works when requested by BKI. See also Section 2, C.3.1.4.
In this connection, all areas to be surveyed have to be cleared, cleaned and to be made free from gas, as
deemed necessary by the Surveyor.
The Class Certificates and other particulars relating to classification are to be made available to the Surveyor
on request.
1.4 Surveys conducted during a voyage may be agreed and credited to periodical surveys due (e.g.
inspection of large holds by boat). The prerequisites, procedures and specific (e.g. weather) conditions
to be met will be fixed from case to case. The decision as to feasibility of the survey may only be taken in
agreement with the Surveyor.
1.5 BKI will inform the owner or operator about the status of Class, indicating the last recognized surveys
and the next due dates. However, even if not provided with such information, the operator is obliged to
have the surveys stipulated by the present Rules performed.
1.6 BKI may agree to test and analysis procedures as a supplement to or equivalent substitute for
conventional survey and inspection such as by uncovering/opening up of components, see also B.1.3.4.
1.7 BKI reserves the right for given reasons, e.g. in the light of special experience gained during operation,
to extend the scope of survey and/or inspection or to carry that out with two Surveyors, if needed.
1.8 BKI reserves the right to demand surveys to be held between the due dates of regular surveys, if this
is necessary, see B.2.
1.9 Special consideration may be given in application of relevant sections of this Rules for commercial
ships owned or chartered by governments, which are utilized in support of military operations or services.

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2. Selection of Surveyors

On principle, the acting Surveyors will be chosen by BKI. However, the operator of a ship and/or an
installation classed is free to have any findings of surveys or decisions which he deems to be doubtful
checked by other Surveyors upon his request.

3. Documentation, Confirmation of Class

3.1 The records of each survey, as well as any requirements upon which maintenance of the Class has
been made conditional will be stated in the relevant Certificate of Classification. By his signature in the
Certificate and other documents the Surveyor only certifies what he himself has seen and checked during
the particular survey. The safety valves of exhaust gas economizer may be tested by Chief Engineer and the
result are to be recorded in the log book, which are to be kept on board.
3.2 The reports prepared by the Surveyor will be checked at BKI Head Office. If there are no objections,
the confirmation of Class effected by the Surveyor in the Certificate will acquire final validity.
3.3 In the Survey Status the dates of the surveys will be indicated, such as Class Renewals, Annual
Survey, Intermediate Survey, Continuous Class Renewal, bottom and propeller shaft survey as well as
recommendations and their due dates.
3.4 A confirmation of Class effected by the Surveyor relates to the kind of survey referred to in the report
and is valid under the reservation that examination will not give cause for any objections, see 3.2.
3.5 On request, the Class may be confirmed in writing by a separate Certificate. However, such Certificates
are valid only if issued by BKI Head Office or if, in exceptional cases, Head Office has expressly authorized
the Branch Offices to do so.
3.6 Where defects are repaired provisionally only, or where the Surveyor does not consider immediate
repairs or replacements necessary, the vessel’s Class may be confirmed for a limited period by making an
entry in the Certificate of Classification. Cancellation of such limitations will also have to be indicated in the
Certificate of Classification, as well as in the Survey Report see also Section 2, B.3.1.1.
3.7 Imposing, clearing and controlling Conditions of Class
3.7.1 Condition of Class shall be imposed for the following:

A) Repairs and/or renewals related to damages that affect Classification (e.g. grounding, structural
damages, machinery damages, wastage over the allowable limits, etc.)

B) Supplementary survey requirements

C) Temporary repairs

3.7.2 For repairs not completed at the time of survey, a Condition of Class is to be imposed. In order to
provide adequate information to the surveyor attending for survey of the repairs, the Condition of Class is
to be sufficiently detailed with identification of items to be repaired. For identification of extensive repairs,
reference may be given to the survey report.
3.7.3 Condition of Class may require imposing limitations related to navigation and operation that are
deemed necessary for continued operation under Classification (e.g. loss of anchor and/or chain, etc).
3.7.4 Condition of Class are given in writing with a time limit for completion to the owner’s
representatives/Ship’s Master, and are clearly stated on the Certificate of Class or an attachment to the
Certificate of Class and/or class survey status or report.
3.7.5 Owners will be notified of these dates and that the vessel’s class will be subject to a suspension
procedure if the item is not dealt with, or postponed, by the due date.

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3.7.6 Condition of Class of Recommendations shall be supported by an Occasional survey report giving
details of all associated repairs and/or renewals, or of the supplemental surveys carried out. Repairs carried
out shall be reported with identification of:
— Compartment and location
— Structural member
— Repair method
— Repair extent
— NDT/Tests

4. Surveys in accordance with flag state regulations

4.1 Where surveys are required on account of international conventions and of corresponding
laws/official ordinances of a flag state, BKI will undertake them on request, or by official order, acting on
behalf of the authorities concerned, based on the respective provisions; this includes surveys according to:
— the International Convention on Load Lines (ILLC 66)
— the International Convention for the Safety of Life at Sea (SOLAS 74)
— the International Convention for the Prevention of Pollution from Ships (MARPOL 73/78)
— the International Convention for the Control and Management of Ship’s Ballast Water and Sediments,
2004 (BWM Convention)
— the IMO Codes, e.g. on Chemical and Gas Tankers
— the related Conventions of the International Labour Organization (ILO)
— etc.

Where possible, such surveys will be carried out simultaneously with the Class Surveys.
4.2 BKI will also undertake on request other surveys and checks stipulated by additional regulations and
requirements of the flag state. Such surveys are subject to agreements made in each individual case and/or
to the regulations of the country concerned.
4.3 All activities as outlined in 4.1 and 4.2 and, where applicable, issuance of relevant Certificates are
likewise subject to the general terms and conditions of Section 1.
4.4 If for some reason a vessel’s Class has expired or has been withdrawn by BKI, all Statutory Certificates
issued by BKI will automatically become void. If subsequently the Class is renewed or re-assigned, validity of
these Certificates will be revived within the scope of its original period of validity, provided that all surveys
meanwhile having fallen due have been carried out.

5. Preparations for Survey

5.1 Conditions for survey
5.1.1 The Owner is to provide the necessary facilities for a safe execution of the survey.
5.1.2 Tanks and spaces are to be safe for access, i.e. gas freed, ventilated and illuminated.
5.1.3 In preparation for survey and thickness measurements and to allow for a thorough examination, all
spaces are to be cleaned including removal from surfaces of all loose accumulated corrosion scale. Spaces
are to be sufficiently clean and free from water, scale, dirt, oil residues etc. to reveal corrosion, deformation,
fractures, damages, or other structural deterioration.
However, those areas of structure whose renewal has already been decided by the Owner need only be
cleaned and descaled to the extent necessary to determine the limits of the areas to be renewed.

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5.1.4 Sufficient illumination is to be provided to reveal corrosion, deformation, fractures, damages or

other structural deterioration.
5.1.5 Where soft or semi-hard coatings have been applied, safe access is to be provided for the surveyor to
verify the effectiveness of the coating and to carry out an assessment of the conditions of internal structures
which may include spot removal of the coating. When safe access cannot be provided, the soft or semi-hard
coating is to be removed.
5.1.6 Casings, ceilings or linings, and loose insulation, where fitted, are to be removed, as required by
the Surveyor, for examination of plating and framing. Compositions on plating are to be examined and
sounded, but need not be disturbed if found adhering satisfactorily to the plating.
5.1.7 In refrigerated cargo spaces the condition of the coating behind the insulation is to be examined
at representative locations. The examination may be limited to verification that the protective coating
remains effective and that there are no visible structural defects. Where POOR coating condition is found,
the examination is to be extended as deemed necessary by the Surveyor. The condition of the coating is
to be reported. If indents, scratches, etc., are detected during surveys of shell plating from the outside,
insulations in way are to be removed as required by the Surveyor, for further examination of the plating
and adjacent frames.

5.2 Access to structures

5.2.1 For survey, means are to be provided to enable the surveyor to examine the hull structure in a safe
and practical way.
5.2.2 For survey in cargo holds and ballast tanks, one or more of the following means for access,
acceptable to the Surveyor, is to be provided:

— permanent staging and passages through structures;

— temporary staging and passages through structures;

— hydraulic arm vehicles such as conventional cherry pickers, lifts and movable platforms;

— boats or rafts;

— other equivalent means.

5.2.3 For Surveys conducted by use of a remote inspection technique, one or more of the following means
for access, acceptable to the Surveyor, is to be provided:

— Unmanned robot arm

— Remotely Operated Vehicles (ROV)

— Unmanned Aerial Vehicles / Drones

— Other means acceptable to the Classification Society.

5.3 Equipment for survey

5.3.1 Thickness measurement is normally to be carried out by means of ultrasonic test equipment. The
accuracy of the equipment is to be proven to the Surveyor as required. Thickness measurements are to be
carried out by a firm approved by BKI in accordance with Rules for Approval of Manufacturers and Service
Suppliers (Pt.1, Vol.XI).

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5.3.2 One or more of the following fracture detection procedures may be required if deemed necessary
by the Surveyor:

— radiographic equipment;

— ultrasonic equipment;

— magnetic particle equipment;

— dye penetrant.

5.4 Survey at sea or at anchorage

5.4.1 Survey at sea or at anchorage may be accepted provided the Surveyor is given the necessary
assistance from the personnel onboard. Necessary precautions and procedures for carrying out the survey
are to be in accordance with 5.1, 5.2 and 5.3.
5.4.2 A communication system is to be arranged between the survey party in the tank or space and the
responsible officer on deck. This system must also include the personnel in charge of ballast pump handling
if boats or rafts are used.
5.4.3 When boats or rafts are used, appropriate life jackets are to be available for all participants. Boats
or rafts are to have satisfactory residual buoyancy and stability even if one chamber is ruptured. A safety
checklist is to be provided.
5.4.4 Surveys of tanks by means of boats or rafts may only be undertaken at the sole discretion of the
Surveyor, who is to take into account the safety arrangements provided, including weather forecasting and
ship response in reasonable sea conditions 1) .

6. External service suppliers

The personnel or firms engaged in services affecting classification and statutory work are subject to approval
by BKI.

7. Calibration of measuring equipment

7.1 General
Inspection, measuring and test equipment, which Surveyors rely on to make decisions affecting
classification or statutory certification, are to be individually identified and calibrated to a recognized
national or international standard.

7.2 Simple Measuring Equipment

The Surveyor may accept simple measuring equipment (e.g. rulers, measuring tapes, weld gauges,
micrometers) without individual identification or confirmation of calibration, provided they are of standard
commercial design, properly maintained and periodically compared with other similar equipment or test
pieces.

7.3 Shipboard Equipment

The Surveyor may accept equipment fitted on board a ship and used in examination of shipboard equipment
(e.g. pressure, temperature or rpm gauges and meters) based either on calibration records or comparison
of readings with multiple instruments.
1)
Reference is made to Guidance for Marine Industry (Pt.1, Vol.AC) Sec.2.R-39 - Guidelines for use of Boats or Rafts for Close-up
surveys.

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7.4 Other Equipment

The Surveyor shall satisfy himself that other equipment (e.g. tensile test machines, ultrasonic thickness
measurement equipment, etc.) is calibrated to a recognized national or international standard.

8. Remote Inspection Techniques (RIT)

8.1 Remote Inspection Techniques (RIT) are permitted as an alternative to close-up survey. The RIT
shall provide the information normally obtained from a close-up survey. RIT surveys shall be carried
out in accordance with the requirements given here-in and the requirements of Guidance for Marine
Industry (Pt.1, Vol.AC) Sec.3.R-42 Guidelines for Use of Remote Inspection Techniques for surveys. These
considerations shall be included in the proposals for use of a RIT which shall be submitted in advance of the
survey so that satisfactory arrangements can be agreed with BKI.
8.2 Consideration may be given by the attending Surveyor to allow use of Remote Inspection Techniques
(RIT) as an alternative to close-up survey. Surveys conducted using a RIT are to be completed to the
satisfaction of the attending Surveyor.
8.3 The equipment and procedure for observing and reporting the survey using a RIT shall be discussed
and agreed with the parties involved prior to the RIT survey, and suitable time shall be allowed to set-up,
calibrate and test all equipment beforehand.
8.4 When using a RIT as an alternative to close-up survey, if not carried out by BKI itself, it shall be
conducted by a firm approved as a service supplier according to Rules for Approval of Manufacturers and
Service Suppliers (Pt.1, Vol.XI) and shall be witnessed by an attending surveyor of BKI.
8.5 The structure to be examined using a RIT shall be sufficiently clean to permit meaningful examination.
Visibility shall be sufficient to allow for a meaningful examination. The classification society shall be satisfied
with the methods of orientation on the structure.
8.6 The surveyor shall be satisfied with the method of data presentation including pictorial
representation, and a good two-way communication between the surveyor and RIT operator shall be
provided.
8.7 If the RIT reveals damage or deterioration that requires attention, the surveyor may require traditional
survey to be undertaken without the use of a RIT.

9. Remote Classification Surveys

9.1 General
9.1.1 Remote Survey is a process of verifying that a ship and its equipment are in compliance with these
Section where the verification is undertaken, or partially undertaken, without attendance on board by a
surveyor.
9.1.2 Remote survey will only be appropriate provided the level of assurance is not compromised, and
the survey is carried out with the same effectiveness as and is equivalent to, a survey carried out with
attendance on board by a surveyor.

9.2 Application
9.2.1 The survey which may be carried out remotely are limited as specified below.

— Postponement, issuance, deletion of Condition of Class

— Postponement of Class surveys

— Items of Continuous Survey for Machinery or Planned Maintenance Scheme

— Occasional survey for change of ship’s name

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— Occasional survey for loss of anchor

— Occasional survey for minor machinery or equipment damage

— Occasional survey for minor hull damage

— Occasional survey for minor deficiencies/defects not subject to a Condition of Class

— In-water bottom survey

— Specified items of a class periodical survey (excluding additional specific items of initial or renewal
surveys), including completion of remaining items of a part held class periodical survey

— Non-propelled / un-manned barges/pontoon – annual surveys when no survey of hull compartments

is due

— Minor retrofit / installation/upgrade of equipment

— Documentary or data based initial / periodical / renewal / occasional verifications and surveys

9.2.2 The request for remote survey will subject to review by BKI Head Office. The technical requirements
will be stipulated by BKI after the request is permitted by BKI Head office.
9.2.3 When the classification survey is also related to a statutory item, and BKI is carrying out the statutory
survey on behalf of the flag State Administration, then the flag State Administration acceptance is required,
and possible additional requirements are to be complied with.
9.2.4 The Surveyor may require to confirm the results of the remote survey, by a survey attended on
board by a Surveyor, to credit the relevant survey items, in case the remote survey is not carried out to the
Surveyor’s satisfaction or it is required by BKI Head Office.

B. Surveys for Maintenance of Class

1. Periodical surveys
1.1 Annual Surveys
1.1.1 Schedule
Annual Surveys are to be held within 3 months before or after each anniversary date of the date of the
initial classification survey or the completion of the last Class Renewal Survey.
Anniversary date means the day and the month of each year which will correspond to the date of expiry of
the relevant certificate.

1.1.2 Scope
The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull, hatch covers, hatch coamings, closing appliances, equipment and related piping are maintained in
a satisfactory condition.

1) Hull items:

— examining, in general and as far as can be seen, the hull and its closing appliances;
— examining the anchoring and mooring equipment as far as can be seen, for ships built after
01/01/2007, confirming that the towing and mooring equipment is properly marked with any
restriction associated with its safe operation;
— examining, for bulk carriers of 150 m and above, where appropriate, the ship’s structure in
accordance with the Ship Construction File, taking into account identified areas that need
special;

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— examining the collision and the other watertight bulkheads as far as can be seen;
— examining and testing (locally and remotely) all the watertight doors in watertight;
— examining the arrangements for closing openings in the shell plating below the freeboard deck;
— checking the ballasting arrangements;
— examining each bilge pump and confirming that the bilge pumping system for each watertight
compartment is satisfactory;
— confirming that the drainage from enclosed cargo spaces situated on the freeboard deck is
satisfactory;
— examining visually the drainage facilities for blockage or other damage and confirming the
provision of means to prevent blockage of drainage arrangements, for closed vehicle and Ro-Ro
spaces and special category spaces where fixed pressure water-spraying systems are used;
— confirming, when appropriate and as far as is practicable when examining internal spaces on oil
tankers and bulk carriers, that the means of access to cargo and other spaces remain in good
condition;
— examining the functionality of bilge well alarms to all cargo holds and conveyor tunnels;
— for bulk carriers, examining the hold, ballast and dry space water level detectors and their
audible and visual alarms;
— for bulk carriers, checking the arrangements for availability of draining and pumping systems
forward of the collision bulkhead;
— for single hull, single hold cargo ships, examining the cargo hold water level detector and its
audible and visual alarm;
— Survey of watertight cable transits:
– These requirements apply to all vessels having GT ≥ 500 operating on international voyages
contracted for construction on or after 1st July 2021. A cable Transit Seal Systems Register
is to be provided by the shipbuilder for all watertight cable transits fitted to the vessel
– The Cable Transit Seal Systems Register (Register), as detailed in Annex A.5, is to be
reviewed to confirm it is being maintained and as far as practicable the transits are to be
examined to confirm their satisfactory condition;
– Where there are records entered since the last annual survey of any disruption to the cable
transits or installation of new cable transits, the satisfactory condition of those transits is to
be confirmed by review of records and, if deemed necessary, by examination. The results
are to be recorded in the Register against the specific cable transit.

2) Machinery and Electrical items:

— confirming that the machinery, boilers and other pressure vessels, associated piping systems
and fittings are installed and protected so as to reduce to a minimum any danger to persons on
board, due regard being given to moving parts, hot surfaces and other hazards;
— confirming that the normal operation of the propulsion machinery can be sustained or restored
even though one of the essential auxiliaries becomes inoperative;
— confirming that means are provided so that the machinery can be brought into operation from
the dead ship condition without external aid;
— carrying out a general examination of the machinery, the boilers, all steam, hydraulic, pneumatic
and other systems and their associated fittings to see whether they are being properly
maintained and with particular attention to the fire and explosion hazard;
— examining and testing the operation of main and auxiliary steering arrangements, including
their associated equipment and control systems;

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— confirming that the means of communication between the navigation bridge and steering gear
compartment and the means of indicating the angular position of the rudder are operating
satisfactorily;
— confirming that with ships having emergency steering positions there are means of relaying
heading information and, when appropriate, of supplying visual compass readings to the
emergency steering position;
— confirming that the various alarms required for hydraulic power-operated, electric and
electro-hydraulic steering gears are operating satisfactorily and that the re-charging
arrangements for hydraulic power-operated steering gears are being maintained;
— examining the means for the operation of the main and auxiliary machinery essential for the
propulsion and the safety of the ship, including, when applicable, the means of remotely
controlling the propulsion machinery from the navigating bridge (including the control,
monitoring, reporting, alert and safety actions) and the arrangements to operate the main and
other machinery from a machinery control room;
— confirming the operation of the ventilation for the machinery spaces;
— confirming that the engine room telegraph, the second means of communication between the
navigation bridge and the machinery space and the means of communication with any other
positions from which the engines are controlled are operating satisfactorily;
— confirming that the engineer’s alarm is clearly audible in the engineers’ accommodation;
— examining, as far as practicable, visually and in operation, the electrical installations, including
the main source of power and the lighting systems;
— confirming, as far as practicable, the operation of the emergency source(s) of electrical power
including their starting arrangements, the systems supplied and, when appropriate, their
automatic operation;
— examining, in general, that the precautions provided against shock, fire and other hazards of
electrical origin are being maintained;
— examining the arrangements for periodically unattended machinery spaces and, in particular,
the random testing of alarm, automatic and shutdown functions;
— examining, where applicable, the alternative design and arrangements for machinery or
electrical installations, or fire safety, in accordance with the test, inspection and maintenance
requirements, if any, specified in the approved documentation;
— confirming, as far as practicable, that no changes have been made in the structural fire
protection, examining any manual and automatic fire doors and proving their operation, testing
the means of closing the main inlets and outlets of all ventilation systems and testing the means
of stopping power ventilation systems from outside the space served;
— confirming that the means of escape from accommodation, machinery and other spaces are
satisfactory;
— examining the helicopter facilities;
— examining visually the condition of any expansion joints in seawater systems;
— examining visually and confirming operation of the towing winch emergency release system;

3) Load line items:

— checking, in general, that there has been no deterioration in the strength of the hull (LLC 66/88
reg.1);
— checking of the positions of the deck line and load line which, if necessary, are to be re-marked
and re-painted (LLC 66/88 regs.4 to 9);
— checking that no alterations have been made to the hull or superstructures that would affect
the calculations determining the position of the load lines (LLC 66/88 regs.11 to 45);

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— examining the superstructure end bulkheads and the openings therein (LLC 66/88 regs.11 and
12);
— examining the means of securing the weathertightness of cargo hatchways, other hatchways
and other openings on the freeboard and superstructure decks (LLC 66/88 regs.13 to 18);
— examining the ventilators and air pipes, including their coamings and closing appliances (LLC
66/88 regs.19 and 20);
— examining the watertight integrity of the closures to any openings in the ship’s side below the
freeboard deck (LLC 66/88 reg.21);
— examining the scuppers, inlets and discharges (LLC 66/88 reg.22);
— examining the garbage chutes (LLC 66/88/03 reg.22-1);
— examining the means provided to minimize water ingress through the spurling pipes and chain
lockers (LLC 66/88/03 reg.22-2);
— examining the side scuttles and deadlights
— examining the bulwarks including the provision of freeing ports, special attention being given
to any freeing ports fitted with shutters (LLC 66/88/03 regs.24 and 25);
— examining the guardrails, gangways, walkways and other means provided for the protection of
the crew and means for safe passage of crew (LLC 66/88/03 regs.25 and 25-1);
— examining the special requirements for ships permitted to sail with type ”A” or type ”B-minus”
freeboards (LLC 66/88/03 regs.26 and 27);
— checking, when applicable, the fittings and appliances for timber deck cargoes (LLC 66/88
regs.42 to 45).

4) Fire fighting equipment:

— examining the fire pumps, fire main, hydrants, hoses and nozzles and the international shore
connection and checking that each fire pump, including the emergency fire pump, can be
operated separately so that two jets of water are produced simultaneously from different
hydrants at any part of the ship whilst the required pressure is maintained in the fire main,
— for ships designed to carry containers on or above the weather deck, as applicable, examining
the water mist lance, and as appropriate, the mobile water monitors and all necessary hoses,
fittings and required fixing hardware,
— checking the provision and randomly examining the condition of the portable and non-portable
fire extinguishers,
— confirming that the firefighters’ outfits including its self-contained compressed air breathing
apparatus and emergency escape breathing devices (EEBDs) are complete and in good
condition, that the cylinders, including the spare cylinders, of any required self-contained
breathing apparatus are suitably charged, and that on board means of recharging breathing
apparatus cylinders used during drills or a suitable number of spare cylinders to replace
those used are provided, and provision of two-way portable radiotelephone apparatus of an
explosion-proof type or intrinsically safe,
— checking the operational readiness and maintenance of firefighting systems,
— examining the fixed firefighting system for the machinery, cargo, vehicle, special category and
ro-ro spaces, as appropriate, and confirming that its means of operation is clearly marked,
— examining the fire-extinguishing and special arrangements in the machinery spaces and
confirming, as far as practicable and as appropriate, the operation of the remote means of
control provided for the opening and closing of the skylights, the release of smoke, the closure
of the funnel and ventilation openings, the closure of power operated and other doors, the
stopping of ventilation and boiler forced and induced draft fans and the stopping of oil fuel and
other pumps that discharge flammable liquids,

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— checking that fixed carbon dioxide fire-extinguishing systems for the protection of machinery
spaces and cargo pump-rooms, where applicable, are provided with two separate controls, one
for opening of the gas piping and one for discharging the gas from the storage container, each
of them located in a release box clearly identified for the particular space,
— examining, as far as possible, and testing, as feasible, any fire detection and alarm system and
any sample extraction smoke detection system,
— examining the fire-extinguishing systems for spaces containing paint and/or flammable liquids
and deep-fat cooking equipment in accommodation and service spaces,
— examining the helicopter facilities,
— examining the arrangements for remote closing of valves for oil fuel, lubricating oil and other
flammable oils and confirming, as far as practicable and as appropriate, the operation of the
remote means of closing the valves on the tanks that contain oil fuel, lubricating oil and other
flammable oils,
— examining and testing of the general emergency alarm system,
— examining the fire protection arrangements in cargo, vehicle and ro-ro spaces, including the fire
safety arrangements for vehicle carriers carrying motor vehicles with compressed hydrogen or
natural gas in their tanks for their own propulsion as cargo, as applicable, and confirming, as far
as practicable and as appropriate, the operation of the means of control provided for closing
the various openings,
— examining and testing the portable gas detectors suitable for the detection of the gas fuel, for
vehicle carriers carrying motor vehicles with compressed hydrogen or natural gas in their tanks
for their own propulsion as cargo,
— examining, where applicable, the alternative design and arrangements for fire safety or
life-saving appliances and arrangements, in accordance with the test, inspection and
maintenance requirements, if any, specified in the approved documentation. This requirement
is applicable only for the firefighting protection,
— examining, when appropriate, the special arrangements for carrying dangerous goods, including
checking the electrical equipment and wiring, the ventilation, the provision of protective
clothing and portable appliances and the testing of the water supply, bilge pumping and any
water spray system.

5) Examination of weather decks, ship side plating above water line, hatch covers and coamings.

— Confirmation is to be obtained that no unapproved changes have been made to the hatch
covers, hatch coamings and their securing and sealing devices since the last survey.
— Where mechanically operated steel covers are fitted, checking the satisfactory conditions, as
applicable, of:
– hatch covers;
– tightness devices of longitudinal, transverse and intermediate cross junctions (gaskets,
gasket lips, compression bars, drainage channels);
– clamping devices, retaining bars, cleating;
– chain or rope pulleys;
– guides;
– guide rails and track wheels;
– stoppers, etc.;
– wires, chains, gypsies, tensioning devices;
– hydraulic system essential to closing and securing; safety locks and retaining devices.
— Where portable covers, wooden or steel pontoons are fitted, checking the satisfactory condition
where applicable, of:

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– wooden covers and portable beams, carriers or sockets for the portable beam, and their
securing devices;
– steel pontoons,
– tarpaulins;
– cleats, battens and wedges;
– hatch securing bars and their securing devices;
– loading pads/bars and the side plate edge;
– guide plates and chocks;
– compression bars, drainage channels and drain pipes (if any).
— Checking the satisfactory condition of hatch coaming plating and their stiffeners, where
applicable.
— Random checking of the satisfactory operation of mechanically operated hatch covers is to be
made including:
– stowage and securing in open condition;
– proper fit and efficiency of sealing in closed condition;
– operational testing of hydraulic and power components, wires, chains, and link drives.
— Examination of the weld connection between air pipes and deck plating.
— External examination of all air pipe heads installed on the exposed decks.
— Examination of flame screens on vents to all bunker tanks.
— Examination of ventilators, including closing devices, if any.

6) Suspect Areas

Suspect Areas identified at previous surveys are to be examined. Thickness measurements are to
be taken of the areas of substantial corrosion and the extent of thickness measurements is to be
increased to determine areas of substantial corrosion. Table 3.2 may be used as guidance for these
additional thickness measurements. These extended thickness measurements are to be carried out
before the annual survey is credited as completed.

Note:

these requirements are not applicable to cargo tanks of oil tankers, chemical tankers and double hull
oil tankers, surveyed in accordance with Section 4-I, B, Section 4-I, D and Section 4-I, C.

7) Examination of Ballast Tanks

Examination of ballast tanks when required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out. When considered necessary by the surveyor, or
where extensive corrosion exists, thickness measurement is to be carried out. If the results of these
thickness measurements indicate that Substantial Corrosion is found, then the extent of thickness
measurements is to be increased to determine areas of substantial corrosion. Table 3.2 may be used
as guidance for these additional measurements. These extended thickness measurements are to be
carried out before the annual survey is credited as completed.

8) Refrigerating Installation

— The refrigerating machinery is to be checked in operation. During this check, the delivery and
discharge temperatures at the air coolers and at the brine coolers respectively, the temperatures
of the refrigerated cargo spaces, or refrigerated cargo containers, of the ambient air, the cooling
water inlet and outlet, the refrigerant in the condenser and evaporator will be determined.

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— The entire plant for the power supply, including the part of the electrical plant necessary for
operation of the refrigerating installation, is to be inspected externally. The Surveyor is to obtain
the information required on the condition of the installation from the operating data records for
the refrigerating and machinery installation and is then to decide whether individual machines
will have to be opened up for inspection.
— Insulation resistance measurements are to be carried out at the electrical plant. Any
measurement protocols prepared on board may be considered.
— All pressure vessels, including valves, fittings and safety devices, are to be inspected externally.
— If ammonia is used as refrigerant, the covers of one or more heat exchangers are to be taken off
for inspection of the tube plates. Depending on the inspection result, the Surveyor may require
further parts of the installation to be opened up for inspection.
— The refrigerant and brine pipes and their insulation are to be examined externally, and the pipes
are to be tested for tightness during operation.
— In the refrigerated cargo spaces, the air coolers, the brine grids and direct expansion evaporators
respectively, as well as circulating fans, are to be inspected during operation.
— The defrosting devices are to be externally inspected. Where necessary, proof is to be furnished
of their proper functioning.
— Bilge coverings are to be opened up. Bilges are to be checked as to their perfect condition. The
drains of the upper spaces with their closing devices, the bilge pipes and their suction strums,
as well as the sounding pipes, are to be inspected. Hatches, doors, pipelines, thermometer
tubes with their connections and fastenings, as well as watertight doors and air ducts, are to
be checked. Cemented parts where brine might seep into the bilges are to be inspected with
particular care.
— The insulation of all refrigerated cargo spaces, apparatus and piping are to be checked as to
whether they are free from damages and dry, especially at positions where moisture may
collect, e.g. in the bottom insulation underneath the hatches, underneath stringers and below
decks.
— After repairs of the hold insulation, the Surveyor has to satisfy himself that no cooling air enters
the insulation.
— The proper operation of dehydrators, thermometers and remote indicating thermometers is to
be checked.
— The proper operation of air duct couplings for connecting refrigerated containers to the ship’s
own refrigerated installation has to be checked. Also, it is to be ascertained whether the air
ducts are free from defects.
— The results of checks conducted on board may be considered.

9) Additional items for oil tankers (Deck foam and inert gas systems; steering gear ; hull, machinery
and equipment) :

— checking the deck foam system, including the supplies of foam concentrate and testing that the
minimum number of jets of water at the required pressure in the fire main is obtained,
— examining the inert gas system:
– examining externally for any sign of gas or effluent leakage;
– confirming the proper operation of both inert gas blowers;
– observing the operation of the scrubber-room ventilation system;
– checking the deck water seal for automatic filling and draining, and the arrangements for
protecting the system against freezing;
– where a double block and bleed valve is installed, checking the automatic operations of the
block and the bleed valves upon loss of power;

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– where two shut-off valves in series with a venting valve in between are used as non-return
devices, checking the automatic operation of the venting valve, and the alarm for faulty
operation of the valves;
– examining the operation of all remotely operated or automatically controlled valves and,
in particular, the flue gas isolating valves;
– observing a test of the interlocking feature of soot blowers;
– observing that the gas pressure regulating valve automatically closes when the inert gas
blowers are secured;
– checking the means for separating the cargo tank not being inerted from the inert gas main;
– checking the alarms of the two oxygen sensors positioned in the space or spaces containing
the inert gas system;
– checking, as far as practicable, the following alarms and safety devices of the inert gas
system using simulated conditions where necessary:
— high oxygen content of gas in the inert gas main;
— low gas pressure in the inert gas main;
— low pressure in the supply to the deck water seal;
— high temperature of gas in the inert gas main;
— low water pressure or low water-flow rate;
— accuracy of portable and fixed oxygen-measuring equipment by means of calibration
gas;
— high water level in the scrubber;
— failure of the inert gas blowers;
— failure of the power supply to the automatic control system for the gas regulating
valve and to the instrumentation for continuous indication and permanent recording
of pressure and oxygen content in the inert gas main;
— high pressure of gas in the inert gas main;
— checking, when practicable, the proper operation of the inert gas system on completion of the
checks listed above
— examining the fixed firefighting system for the cargo pump rooms and confirming, as far as
practicable and when appropriate, the operation of the remote means for closing the various
openings;
— checking for all tankers, the provision of at least one portable instrument for measuring oxygen
and one for measuring flammable vapour concentrations, together with a sufficient set of
spares, and suitable means for the calibration of these instruments;
— examining the arrangements for gas measurement in double-hull spaces and double bottom
spaces, including the fitting of permanent gas sampling lines, where appropriate
— examining, as far as possible, and testing the fixed hydrocarbon gas detection system
— checking protection of cargo pump room, and in particular:
— confirming, when appropriate, that the requisite arrangements to regain steering capability in
the event of the prescribed single failure are being maintained;
— examining the cargo tank openings, including gaskets, covers, coamings and screens;
— examining the cargo tank pressure/vacuum valves and devices to prevent the passage of flame;
— examining the devices to prevent the passage of flame on vents to all bunker, oily-ballast and
oily-slop tanks and void spaces, as far as practicable;
— examining the cargo tank venting, cargo tank purging and gas-freeing and other ventilation
systems;
— examining the cargo, crude oil washing, ballast and stripping systems both on deck and in the
cargo pump rooms and the bunker system on deck;

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— confirming that all electrical equipment in dangerous zones is suitable for such locations, is in
good condition and is being properly maintained;
— confirming that potential sources of ignition in or near the cargo pump room are eliminated,
such as loose gear, combustible materials, etc., that there are no signs of undue leakage and
that access ladders are in good condition;
— examining all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of cargo pump room bulkheads;
— examining, as far as practicable, the cargo, bilge, ballast and stripping pumps for undue gland
seal leakage, verification of proper operation of electrical and mechanical remote operating and
shutdown devices and operation of cargo pump room bilge system, and checking that pump
foundations are intact;
— confirming that the pump room ventilation system is operational, ducting intact, dampers are
operational and screens clean;
— verifying that installed pressure gauges on cargo discharge lines and level indicator systems are
operational;
— examining access to bow arrangement;
— examining the towing arrangement for tankers of not less than 20,000 tonnes deadweight);
— confirming that the corrosion prevention system fitted to dedicated ballast water tanks of oil
tankers and bulk carriers when appropriate is maintained;
— confirming that the coating system in cargo oil tanks of crude oil tankers, when appropriate, is
maintained and that in-service maintenance and repair activities are recorded in the coating
technical file;
— examining the emergency lighting in all cargo pump rooms of tankers constructed after 1 July
2002;
— examining, for oil tankers of 150 m in length and above, where appropriate, the ship’s structure
in accordance with the Ship Construction File, taking into account identified areas that need
special attention and verifying that the Ship Construction File is updated, where applicable;

10) Additional items for chemical tankers (Steering gear, structure, equipment, fittings, arrangements,
and materials):

— confirming, when appropriate, that the requisite arrangements to regain steering capability in
the event of the prescribed single failure are being maintained;
— examining the cargo tank openings, including gaskets, covers, coamings and screens;
— examining the cargo tank pressure/vacuum valves and devices to prevent the passage of flame;
— examining the devices to prevent the passage of flame on vents to all bunker, oily-ballast and
oily-slop tanks and void spaces, as far as practicable;
— examining the cargo tank venting, cargo tank purging and gas-freeing and other ventilation
systems;
— examining the cargo, crude oil washing, ballast and stripping systems both on deck and in the
cargo pump rooms and the bunker system on deck;
— confirming that all electrical equipment in dangerous zones is suitable for such locations, is in
good condition and is being properly maintained;
— confirming that potential sources of ignition in or near the cargo pump room are eliminated,
such as loose gear, combustible materials, etc., that there are no signs of undue leakage and
that access ladders are in good condition;
— examining all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of cargo pump room bulkheads;

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— examining, as far as practicable, the cargo, bilge, ballast and stripping pumps for undue gland
seal leakage, verification of proper operation of electrical and mechanical remote operating and
shutdown devices and operation of cargo pump room bilge system, and checking that pump
foundations are intact;
— confirming that the pump room ventilation system is operational, ducting intact, dampers are
operational and screens clean;
— verifying that installed pressure gauges on cargo discharge lines and level indicator systems are
operational;
— examining access to bow arrangement;
— examining the towing arrangement for tankers of not less than 20,000 tonnes deadweight;
— confirming that the corrosion prevention system fitted to dedicated ballast water tanks of oil
tankers and bulk carriers when appropriate is maintained;
— examining the emergency lighting in all cargo pump rooms of tankers constructed after 1 July
2002;
— confirming that wheelhouse doors and windows, side scuttles and windows in superstructure
and deckhouse ends facing the cargo area are in a satisfactory condition;
— confirming that potential sources of ignition in or near the cargo pump room are eliminated,
such as loose gear, combustible materials, etc., that there are no signs of undue leakage and
that access ladders are in a satisfactory condition;
— confirming that removable pipe lengths or other approved equipment necessary for cargo
separation are available in the pump room and are in a satisfactory condition;
— examining all pump room bulkheads for signs of cargo leakage or fractures and, in particular,
the sealing arrangements of all penetrations of pump room bulkheads;
— confirming that the remote operation of the cargo pump bilge system is satisfactory;
— examining the bilge and ballast arrangements and confirming that pumps and pipelines are
identified;
— confirming, when applicable, that the bow or stern loading and unloading arrangements are in
order and testing the means of communication and the remote shut down for the cargo pumps;
— examining the cargo transfer arrangements and confirming that any hoses are suitable for their
intended purpose and, where appropriate, type-approved or marked with date of testing;
— examining, when applicable, the cargo heating or cooling systems, including any sampling
arrangements, and confirming that the means for measuring the temperature and associated
alarms are operating satisfactorily;
— examining, as far as practicable, the cargo tank vent system, including the pressure/vacuum
valves and secondary means to prevent over- or under-pressure and devices to prevent the
passage of flame, and the arrangements of cargo tank purging with inert gas, as applicable;
— examining the gauging devices, high-level alarms and valves associated with overflow control;
— confirming that arrangements for sufficient gas to be carried or generated to compensate for
normal losses, and that the means provided for monitoring ullage spaces, are satisfactory;
— confirming that arrangements are made for sufficient medium to be carried where drying agents
are used on air inlets to cargo tanks;
— confirming that all electrical equipment in dangerous zones is suitable for such locations, is in
satisfactory condition and has been properly maintained;
— examining the fixed firefighting system for the cargo pump room and the deck foam system for
the cargo area and confirming that their means of operation are clearly marked;
— confirming that the condition of the portable fire extinguishing equipment for the cargoes to
be carried in the cargo area is satisfactory;

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— confirming that the system for continuous monitoring of the concentration of flammable
vapours is satisfactory;
— examining, as far as practicable, and confirming the satisfactory operation of, the arrangements
for the ventilation of spaces normally entered during cargo handling operations and other
spaces in the cargo area;
— confirming, as far as practicable, that the intrinsically safe systems and circuits used for
measurement, monitoring, control and communication purposes in all hazardous locations are
being properly maintained;
— examining the equipment for personnel protection and in particular that:
– the protective clothing for crew engaged in loading and discharging operations and its
stowage is in a satisfactory condition;
– the required safety equipment and associated breathing apparatus and associated air
supplies and, when appropriate, emergency-escape respiratory and eye protection, are in
a satisfactory condition and are properly stowed;
– medical first-aid equipment, including stretchers and oxygen resuscitation equipment are
in a satisfactory condition;
– arrangements have been made for the antidotes for the cargoes actually carried to be on
board;
– decontamination arrangements and eyewashes are operational;
– the required gas detection instruments are on board and arrangements have been made
for the supply of the appropriate vapour detection tubes;
– the arrangements for the stowage of cargo samples are satisfactory;
— confirming that sampling points or detector heads are located in suitable positions in order that
potentially dangerous leakages are readily detected;

11) Additional items for gas carrier:

— confirming, when appropriate, that the requisite arrangements to regain steering capability in
the event of the prescribed single failure are being maintained;
— examining the cargo tank openings, including gaskets, covers, coamings and screens;
— examining the cargo tank pressure/vacuum valves and devices to prevent the passage of flame;
— examining the devices to prevent the passage of flame on vents to all bunker, oily-ballast and
oily-slop tanks and void spaces, as far as practicable;
— examining the cargo tank venting, cargo tank purging and gas-freeing and other ventilation
systems;
— confirming that all electrical equipment in dangerous zones is suitable for such locations, is in
good condition and is being properly maintained;
— confirming that potential sources of ignition in or near the cargo pump room are eliminated,
such as loose gear, combustible materials, etc., that there are no signs of undue leakage and
that access ladders are in good condition;
— examining all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of cargo pump room bulkheads;
— examining, as far as practicable, the cargo, bilge, ballast and stripping pumps for undue gland
seal leakage, verification of proper operation of electrical and mechanical remote operating and
shutdown devices and operation of cargo pump room bilge system, and checking that pump
foundations are intact;
— confirming that the pump room ventilation system is operational, ducting intact, dampers are
operational and screens clean;

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— verifying that installed pressure gauges on cargo discharge lines and level indicator systems are
operational;
— examining access to bow arrangement;
— examining the towing arrangement for tankers of not less than 20,000 tonnes deadweight;
— confirming that the corrosion prevention system fitted to dedicated ballast water tanks of oil
tankers and bulk carriers when appropriate is maintained;
— examining the emergency lighting in all cargo pump rooms of tankers constructed after 1 July
2002;
— confirming that any special arrangements to survive conditions of damage are in order;
— examining, where applicable, the alternative design and arrangements for the segregation of
the cargo area, in accordance with the test, inspection and maintenance requirements, if any,
specified in the approved documentation;
— confirming that the wheelhouse doors and windows, sidescuttles and windows in
superstructure and deckhouse ends in the cargo area are in a satisfactory condition;
— examining the cargo machinery spaces and turret compartments, including their escape routes;
— confirming that the manually operated emergency shutdown system together with the
automatic shutdown of the cargo pumps and compressors are satisfactory;
— examining the cargo control room;
— examining the gas detection arrangements for cargo control rooms and the measures taken to
exclude ignition sources where such spaces are classified as hazardous areas;
— confirming the arrangements for the air locks are being properly maintained;
— examining, as far as practicable, the bilge, ballast and oil fuel arrangements;
— examining, when applicable, the bow or stern loading and unloading arrangements with
particular reference to the electrical equipment, firefighting arrangements and means of
communication between the cargo control room and the shore location;
— confirming that the sealing arrangements at the gas domes are satisfactory;
— confirming that portable or fixed drip trays or deck insulation for cargo leakage is in order;
— examining the cargo and process piping, including the expansion arrangements, insulation from
the hull structure, pressure relief and drainage arrangements and water curtain protection as
appropriate;
— confirming that the cargo tank and interbarrier space pressure and relief valves, including safety
systems and alarms, are satisfactory;
— confirming that any liquid and vapour hoses are suitable for their intended purpose and, where
appropriate, type-approved or marked with date of testing;
— examining the arrangements for the cargo pressure/temperature control including, when fitted,
the thermal oxidation systems and any refrigeration system and confirming that any associated
safety measures and alarms are satisfactory;
— examining the cargo, bunker, ballast and vent piping systems, including PRVs, vacuum relief
valves, vent masts and protective screens, as far as practicable and confirming that the PRVs
are type-approved or marked with date of testing;
— confirming that arrangements are made for sufficient inert gas to be carried to compensate for
normal losses and that means are provided for monitoring the spaces;
— confirming that the use of inert gas has not increased beyond that needed to compensate for
normal losses by examining records of inert gas usage;
— confirming that any air-drying system and any interbarrier and hold space purging inert gas
system are satisfactory;

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— confirming that electrical equipment in hazardous areas is in a satisfactory condition and is being
properly maintained;
— examining the arrangements for the fire protection and fire extinction and testing the remote
means of starting one main fire pump;
— examining the fixed fire-fighting system for the enclosed cargo machinery spaces, and the
enclosed cargo motor room within the cargo area, and confirming that its means of operation
is clearly marked;
— examining the water spray system for cooling, fire protection and crew protection and
confirming that its means of operation is clearly marked;
— examining the dry chemical powder fire-extinguishing system for the cargo area and confirming
that its means of operation is clearly marked;
— examining the appropriate fire-extinguishing system for the enclosed cargo machinery spaces
for ships that are dedicated to the carriage of a restricted number of cargoes and the internal
water spray system for the turret compartments and confirming their means of operation is
clearly marked;
— examining, as far as practicable, and confirming the satisfactory operation of, the arrangements
for the artificial ventilation of spaces in the cargo area normally entered during cargo handling
operations;
— examining, and confirming the satisfactory operation of, the arrangements for the artificial
ventilation of spaces normally entered other than those covered by confirming the provision
and examining the disposition of the fire-fighters’ outfits including their self-contained
compressed air breathing apparatus, and the provision of two-way portable radiotelephone
apparatus of an explosion-proof type or intrinsically safe;
— examining, and testing as appropriate and as far as practicable, the liquid level indicators,
overflow control, pressure gauges, high pressure and, when applicable, low pressure alarms,
and temperature indicating devices for the cargo tanks;
— examining, and testing as appropriate, the gas detection equipment.
12) Additional items for container ship, container barge/pontoon, ships equipped for carriage of
containers and ships equipped for carriage of ISO tank containers:
— random examination of the accessible fixed cargo securing fittings located on exposed decks,
container stanchions and lashing bridges.
— Verification of entries in the maintenance and inspection record book documenting the
inspections and maintenance of fixed container securing fittings and loose lashing gear.
— Verification of origin/identity of fixed container securing fittings and loose lashing gear, against
approved cargo securing manual on board.
— For the lashing software, it shall be checked that the operation manual is available on board and
for reference see Rules for Stowage and Lashing of Containers (Pt.4, Vol.I) Sec.6

1.2 Intermediate Surveys

1.2.1 Schedule
1) The Intermediate Survey is to be carried out either at or between the second and third Annual Survey.
2) Those items which are additional to the requirements of the Annual Surveys may be surveyed either
at or between the 2nd and 3rd Annual Survey.
3) A survey planning meeting is to be held prior to the commencement of the survey.
4) Concurrent crediting to both Intermediate Survey (IS) and Class Renewal Survey (SS) for surveys and
thickness measurements of spaces are not acceptable.

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1.2.2 Scope
The scope of the second or third Annual Survey is to be extended to include the following:

1) For ships between 5 and 10 years of age, a general, internal examination of representative ballast
tanks is to be carried out. If there is no hard-protective coating, soft or semi-hard coating, or POOR
coating condition, the examination is to be extended to other ballast tanks of the same type.

2) For ships over 10 years of age, a general, internal examination of all ballast tanks is to be carried out.

A) If such examinations reveal no visible structural defects, the examination may be limited to a
verification that the corrosion prevention system remains effective.
B) For ballast tanks, excluding double bottom ballast tanks, if there is no hard-protective coating,
soft or semi-hard coating, or POOR coating condition and it is not renewed, the tanks in question
are to be internally examined at annual intervals.
C) When such conditions are found in double bottom ballast tanks, the tanks in question may be
internally examined at annual intervals.

3) In the case of dry cargo ships over 15 years old, other than bulk carriers or general dry cargo ships,
an internal examination of selected cargo holds is to be carried out.

4) In the case of ships over 10 years of age, other than oil and chemical tankers with additional class
notation ESP, liquefied gas carriers, and ships engaged in the carriage of dry cargoes only, an internal
examination of selected cargo spaces is to be carried out.

5) Machinery and electrical installations

A) The following measurements are to be performed and/or proved to have been performed by
up to-date protocols:
— crank web deflection, main engine(s)
— crank web deflection, auxiliary diesel(s) (where relevant)
— insulation resistance of generators and essential electrical motors, including cabling and
switchgear
B) Additionally, the following system components are to be subjected to operation tests:
— emergency generating set, including emergency switchboard
— emergency bilge valve
— bilge, ventilation and monitoring systems for the carriage of dangerous goods
— drainage facilities of starting-air and control-air receivers
— general operational test of the machinery and electrical installations for furnishing proof
of unrestricted operability, as indicated by the Surveyor

6) Refrigerating Installation

A) As against the procedure outlined in 1.1.2.8), Survey to be extended in scope as follows.

B) Parts of compressors subject to wear, such as cylinders, pistons, piston rods, glands, bearings
as well as parts of auxiliaries, such as shafts, impellers and diffusers of centrifugal pumps, etc.,
are to be inspected at random, unless the Surveyor considers a thorough examination to be
necessary. The driving motors of compressors are to be inspected. Also, parts necessary for
operation of the driving motors are included.
C) At the Surveyor’s discretion, the end covers of some heat exchangers are to be removed for
inspection of the tube plates and tubes.

7) Additional items for oil tankers (Piping systems and cargo tanks and electrical circuits in dangerous
zones):

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A) should there be any doubt as to its condition when examining the various piping systems, the
piping may be required to be pressure tested, gauged or both. Particular attention is to be paid
to repairs such as welded doublers;
B) testing the insulation resistance of electrical circuits in dangerous zones such as cargo pump
rooms and areas adjacent to cargo tanks, but in cases where a proper record of testing is
maintained, consideration should be given to accepting recent readings.
8) Additional items for chemical tankers (Steering gear, structure, equipment, fittings, arrangements,
and materials):
A) examination of vent line drainage arrangements;
B) confirmation, where applicable, that pipelines and independent cargo tanks are electrically
bonded to the hull;
C) generally examining the electrical equipment and cables in hazardous areas and zones such
as cargo machinery spaces and areas adjacent to cargo tanks to check for defective equipment,
fixtures and wiring. The insulation resistance of the circuits should be tested and in cases where
a proper record of testing is maintained, consideration should be given to accepting recent
readings;
9) Additional items for gas carrier (Steering gear, structure, equipment, fittings, arrangements, and
materials):
A) confirming, where applicable, that pipelines and independent cargo tanks are electrically
bonded to the hull;
B) generally examining the electrical equipment and cables in hazardous areas and zones such as
cargo machinery spaces and areas adjacent to cargo tanks to check for defective equipment,
fixtures and wiring.
The insulation resistance of the circuits should be tested and in cases where a proper record of
testing is maintained consideration should be given to accepting recent readings;
C) confirming that the heating arrangements, if any, for steel structures are satisfactory;

1.3 Class Renewal Surveys

1.3.1 Schedule
1) Class Renewal Surveys are to be carried out at 5 years intervals to renew the Classification Certificate.
Class Renewal surveys are numbered in the sequence I, II, III, IV, etc.
2) The first Class Renewal Survey is to be completed within 5 years from the date of the initial
classification survey and thereafter 5 years from the credited date of the previous Class Renewal
Survey. However, under “exceptional circumstances”, BKI may grant an extension not exceeding three
(3) months to allow for completion of the Class Renewal Survey provided that the vessel is attended
and the attending Surveyor(s) so recommend(s) after the following has been carried out:
A) annual survey;
B) re-examination of Recommendations;
C) progression of the Class Renewal Survey as far as practicable;
D) in the case where dry docking is due prior to the end of the class extension, an underwater
examination is to be carried out by an approved diving company. An underwater examination
by an approved company may be dispensed with in the case of extension of dry-docking survey
not exceeding 36 months interval provided the ship is without outstanding Recommendation
regarding underwater parts.
In this case, the next period of class will start from the expiry date of the Class Renewal Survey
before the extension was granted.

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3) In the case that the Class Certificate will expire when the vessel is expected to be at sea, an extension
to allow for completion of the Class Renewal Survey may be granted provided there is documented
agreement to such an extension prior to the expiry date of the certificate, and provided that positive
arrangements have been made for attendance of the Surveyor at the first port of call, and provided
that BKI is satisfied that there is technical justification for such an extension. Such an extension is to
be granted only until arrival at the first port of call after the expiry date of the certificate. However,
if owing to “exceptional circumstances” the Class Renewal Survey cannot be completed at the first
port of call, 1.3.1.2) may be followed, but the total period of extension shall in no case be longer than
three months after the original due date of the Class Renewal Survey.

4) For surveys completed within 3 months before the expiry date of the Class Renewal Survey, the next
period of class will start from the expiry date of the Class Renewal Survey. For surveys completed
more than 3 months before the expiry date of the Class Renewal Survey, the period of class will start
from the survey completion date.

5) In cases where the vessel has been laid up or has been out of service for a considerable period because
of a major repair or modification and the owner elects to only carry out the overdue surveys, the next
period of class will start from the expiry date of the Class Renewal Survey.

6) If the owner elects to carry out the next due Class Renewal Survey, the period of class will start from
the survey completion date.

7) The Class Renewal Survey may be commenced at the 4th Annual Survey and be progressed with a
view to completion by the 5th anniversary date. When the Class Renewal Survey is commenced prior
to the 4th Annual Survey, the entire survey is to be completed within 15 months if such work is to be
credited to the Class Renewal Survey.

8) A survey planning meeting is to be held prior to the commencement of the survey.

9) Concurrent crediting to both Intermediate Survey (IS) and Class Renewal Survey (SS) for surveys and
thickness measurements of spaces are not acceptable.

1.3.2 Scope
1) The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull, equipment and related
piping, as required in 1.3.2.12), are in satisfactory condition and fit for the intended purpose for the
new period of class of five years to be assigned, subject to proper maintenance and operation and
the periodical surveys being carried out at the due dates.

2) The examinations of the hull are to be supplemented by testing and thickness measurements as
required in 1.3.2.9) and 1.3.2.11), to ensure that the structural integrity remains effective. The aim
of the examination is to discover Substantial Corrosion, significant deformation, fractures, damages
or other structural deterioration, that may be present.

3) The Class Renewal Survey is to include examination of underwater parts per 1.6.

4) The anchors and chain cables are to be ranged, examined and the required complement and condition
verified. The chain locker, holdfasts, hawse pipes and chain stoppers are to be examined and pumping
arrangements of the chain locker tested.

At Class Renewal Survey No. II and subsequent Class Renewal Surveys, chain cables are to gauge and
renewed in cases where their mean diameter is worn below the limits allowed by BKI, see Annex A.3.

The mean diameters of the anchor chain cables are to be determined by representative
measurements, approx. 3 links per length of 27,5 m, made at the ends of the links where the greatest
wear is occurred.

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5) All spaces including holds and their ‘tween decks where fitted; double bottom, deep, ballast, peak
and cargo tanks; pump rooms, pipe tunnels, duct keels, machinery spaces, dry spaces, cofferdams
and voids are to be internally examined including the plating and framing, bilges and drain wells,
sounding, venting, pumping and drainage arrangements. Internal examination of fuel oil, lube oil and
fresh water tanks is to be carried out in accordance with Table 3.3. At Class Renewal Survey No.3 and
subsequent Class Renewal Surveys, structural downflooding ducts and structural ventilation ducts
are to be internally examined.

6) Engine room structure is to be examined. Particular attention is to be given to tank tops, shell plating
in way of tank tops, brackets connecting side shell frames and tank tops, and engine room bulkheads
in way of tank top and bilge wells. Particular attention is to be given to the sea suctions, sea water
cooling pipes and overboard discharge valves and their connections to the shell plating. Where
wastage is evident or suspect, thickness measurements are to be carried out, and renewals or repairs
made when wastage exceeds allowable limits.

7) Where provided, the condition of corrosion prevention system of ballast tanks is to be examined.
For ballast tanks, excluding double bottom tanks, where a hard-protective coating is found in POOR
condition and it is not renewed, where soft or semi-hard coating has been applied, or where a
hard-protective coating was not applied from time of construction, the tanks in question are to be
examined at annual intervals. Thickness measurements are to be carried out as deemed necessary
by the surveyor.

8) When such breakdown of hard protective coating is found in double bottom ballast tanks and it is not
renewed, where a soft or semi-hard coating has been applied, or where a hard-protective coating
was not applied from the time of construction, the tanks in question may be examined at annual
intervals. When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurements are to be carried out.

9) Boundaries of double-bottom, deep, ballast, peak, and other tanks, including holds adapted for the
carriage of salt water ballast, are to be tested with a head of liquid to the top of air pipes or to near
the top of hatches for ballast/cargo holds.

Boundaries of fuel oil, lube oil and fresh water tanks are to be tested with a head of liquid to the
highest point that liquid will rise under service conditions.

Tank testing of fuel oil, lube oil and fresh water tanks may be specially considered based on a
satisfactory external examination of the tank boundaries, and a confirmation from the Master stating
that the pressure testing has been carried out according to the requirements with satisfactory results.
The Surveyor may extend the testing as deemed necessary.

10) Hatch Covers and Coamings

The hatch covers and coamings are to be surveyed as follows:

A) A thorough inspection of the items listed in 1.1.2.5), including close-up survey of hatch cover
plating and hatch coaming plating, is to be carried out. Subject to cargo hold hatch covers of
approved design which structurally have no access to the internals, close-up survey shall be
done of accessible parts of hatch covers structures.
B) Checking of the satisfactory operation of all mechanically operated hatch covers is to be made,
including:
— stowage and securing in open condition;
— proper fit and efficiency of sealing in closed conditions;
— operational testing of hydraulic and power components, wires, chains and link drives.
C) Checking the effectiveness of sealing arrangements of all hatch covers by hose testing or
equivalent is to be carried out.

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11) Thickness measurements are to be carried out in accordance with Table 3.1. The Surveyor may
extend the thickness measurements as deemed necessary. When thickness measurements indicate
substantial corrosion, the extent of thickness measurements is to be increased to determine
areas of substantial corrosion. Table 3.2 may be used as guidance for these additional thickness
measurements. These extended thickness measurements are to be carried out before the survey is
credited as completed.

12) All bilge and ballast piping systems are to be examined and operationally tested to working pressure
to attending Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory.

13) For all ships except for passenger ships, automatic air pipe heads are to be completely examined
(both externally and internally) as indicated in Table 3.4.

For designs where the inner parts cannot be properly inspected from outside, this is to include
removal of the head from the air pipe. Particular attention is to be paid to the condition of the zinc
coating in heads constructed from galvanised steel.

14) Refrigerating Installation

A) Apart from the surveys as detailed in 1.1.2.8) and 1.2.2.6), the following tests and inspections
are to be carried out:
— examination of all parts of compressors and driving motors subject to wear, at the
Surveyor’s discretion, see D) below
— inspection of the primary installation for power supply of the refrigerating installation, as
well as of the electrical installation
— inspection of the sea inlet and discharge valves for cooling water supply to the installation
(possibly, within the scope of classification of the ship)
— internal inspection of the pressure vessels, as far as possible. The end covers of all heat
exchangers are to be removed.
— tightness tests on condensers, evaporators, refrigerant and brine pipes. Pipe coils (air
coolers) in the primary/secondary refrigerating system are to be inspected, removed at
the Surveyor’s discretion and/or subjected to a hydraulic pressure test.
B) In the case of new installations the above mentioned tightness tests, as well as the removal of
parts of the piping insulation and dismounting of pipe coils, may be dispensed with at the time
of the first Class Renewal Survey, at the Surveyor’s discretion.
C) Hydraulic pressure tests on pressure vessels are to be carried out for the first time 10 years
after initial operation, and subsequently, on the occasion of each Class Renewal. In the case of
pressure vessels operated with refrigerants in closed circuit, the periodical hydraulic pressure
tests may be dispensed with.
D) Where screw compressors or semi hermetic piston compressors are fitted, for which
manufacturers have prescribed fixed intervals for maintenance or replacements, BKI may
on request agree to differing intervals between surveys, provided that the compressors are
equipped with reliable working-hour meters and that a sufficient number of units ready for
installation or of complete rotor runner sets is available on board.
A supplementary sheet or the Appendix to the Refrigerating Installation Certificate contains
more detailed information as to whether such surveys will be accepted.

15) Survey of Watertight Cable Transits

A) These requirements apply to all vessels having GT ≥ 500 operating on international voyages
contracted for construction on or after 1st July 2021. A cable Transit Seal Systems Register is to
be provided by the shipbuilder for all watertight cable transits fitted to the vessel.

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B) The requirements for Class Renewal Survey may be undertaken by the attending Surveyor or
by a firm approved as a service supplier according to Rules for Approval of Manufacturers and
Service Suppliers (Pt.1, Vol.XI).
C) All transits are to be examined to confirm their satisfactory condition and the Register is to be
reviewed to confirm it is being maintained. The Class Renewal Survey is to be recorded in the
Register, in which a single record entry will be sufficient to record the survey of all transits.
D) From review of the Register, where there are records entered since the last Class Renewal
Survey of any disruption to the cable transits or installation of new cable transits (except which
are reviewed and examined at previous annual surveys), the satisfactory condition of those
transits is to be confirmed by the attending Surveyor by review of records and examination of
the transits; the results are to be recorded in the Register against each of those cable transits.
E) In case the cable transits have been examined by an approved service supplier, the attending
surveyor is to review the Register in order to ascertain that it has been properly maintained by
the owner and correctly endorsed by the service supplier.
16) Survey of towing winch emergency release systems
A) The full functionality of the emergency release system is to be tested to the satisfaction. Testing
may be conducted either during a bollard pull test or by applying the load against a strong point
on the deck of the tug or the shore that is certified to the appropriate load.
B) The emergency release system is to be tested at a towline load that is equal to the lesser of 30%
of the maximum design load or 80% of vessel bollard pull in both a normal power condition and
power blackout condition to the satisfaction.
17) Survey of container ship, container barge/pontoon, ships equipped for the carriage of container, and
ships equipped for the carriage of ISO tank container:
A) Fixed container securing fittings with their supporting structures with respect to cracks,
deformations and thickness diminution of:
— Cell guides including supports and connection of guide heads to top ends
— container stanchions and racks on deck and in holds
— securing supports and lashing fittings welded to inner bottom, container steps, stanchions,
hatch covers, lashing bridges, etc.
B) Hatch covers:
— Supports and stoppers with respect to condition and operability
— guide rails and supporting frames including connection to hull with respect to cracks and
deformations.
C) Portable (loose) container securing equipment:
— Random examination for damage
— Verification of product certificates kept in ship’s files confirming that defective equipment
has been replaced by equivalent and compatible parts
— Verification that equipment not in use is collected and stored in appropriate bins, for
Pontoon or Barges as far as practicable.
D) Lashing Software:
— checking that the operation manual is available on board.
— checking and verification of the operation manual is to be done in the presence of a
surveyor and for reference see Rules for Lashing and Stowage Containers (Pt.4, Vol.I) Sec.6.

18) Survey of ships with arrangement for pushing or being pushed, the following shall be examined:
— connecting points and contact areas with supporting structure
— connecting equipment including locking device if any.

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Table 3.1 Minimum Requirements for Thickness Measurements at Class Renewal Survey

Class Renewal Survey Class Renewal Survey Class Renewal Survey Class Renewal Survey No. IV
No. I No. II No. III and Subsequent
Age < 5 5 < Age < 10 10 < Age < 15 15 < Age
1) Suspect areas 1) Suspect areas through- 1) Suspect areas through- 1) Suspect areas throughout
throughout the vessel. out the vessel. out the vessel. the vessel.
2) One transverse section 2) A minimum of three
2) Two transverse sections
of deck plating transverse sections
within the amidships
within the within the
0,5L (in way of two
amidships 0,5L amidships 0,5L.
cargo spaces
(in way of a cargo (in way of cargo
if applicable).
space, if available) spaces, if applicable)
3) All cargo hold hatch 3) All cargo hold hatch covers
covers and coamings and coamings (plating and
(plating and stiffeners). stiffeners).
4) Internals in forepeak
4) Internals in forepeak and
and afterpeak ballast
afterpeak ballast tanks.
tanks.
5) All exposed main deck
plating full length.
6) Representative exposed
superstructure deck
plating (poop, bridge,
and forecastle deck).
7) Lowest strake and strakes
in way of ‘tween decks of
all transverse bulkheads in
cargo spaces together with
internals in way.
8) All wind and water strakes,
port and starboard, full
length.
9) All keel plates full length.
Also, additional bottom
plates in way of
cofferdams, machinery
space, and aft end of tanks.
10)Plating of seachests.
Shell plating in way of
overboard discharges as
considered necessary by
the attending surveyor.
Notes:
1. Thickness measurement locations are to be selected to provide the best representative sampling of areas likely to be most
exposed to corrosion, considering cargo and ballast history and arrangement and condition of protective coatings.
2. Thickness measurements of internals may be specially considered by the Surveyor if the hard-protective coating is in GOOD
condition.
3. For ships less than 100 m in length, the number of transverse sections required at Class Renewal Survey No. III may be
reduced to one (1), and the number of transverse sections required at Subsequent Class Renewal Surveys may be reduced
to two (2).
4. For ships more than 100 m in length, at Class Renewal Survey No. III, thickness measurements of exposed deck
plating within amidship 0,5L may be required.
5. Subject to cargo hold hatch covers of approved design which structurally have no access to the internals, thickness
measurement shall be done of accessible parts of hatch covers structures.

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Table 3.2 Guidance for Additional Thickness Measurements in Way of Substantial Corrosion

STRUCTURAL MEMBER EXTENT OF MEASUREMENT PATTERN OF MEASUREMENT

Plating Suspect area and adjacent places. 5 point pattern over 1 m2 .
3 measurements each in line across
Stiffeners Suspect area.
web and flange.

Table 3.3 Minimum Requirements for Internal Examination at Hull Class Renewal Surveys of Fuel Oil,
Lube Oil and Fresh Water Tanks

Class Renewal Class Renewal Class Renewal Class Renewal

Tank Survey No. I Survey No. II Survey No. III Survey No. IV
and Subsequent
Age < 5 5 < Age < 10 10 < Age < 15 15 < Age
Fuel Oil Bunker tanks
- Engine Room None None One One
- Cargo Length Area None One Two Half, minimum 2
- If no tanks in Cargo Length
Area, additional fuel tank(s)
outside of Engine Room None One One Two
(if fitted)
Lube Oil None None None One
Fresh Water None One All All
Notes:
1) These requirements apply to tanks of integral (structural) type.
2) If a selection of tanks is accepted to be examined, then different tanks are to be examined at each Class Renewal Survey,
on a rotational basis.
3) Peak tanks (all uses) are subject to internal examination at each Class Renewal Survey.
4) At Class Renewal Surveys no. III and subsequent surveys, one deep tank for fuel oil in the cargo length area is to be included,
if fitted.

Table 3.4 Survey Requirements for Automatic Pipe Heads at Class Renewal Surveys

Class Renewal Survey No. III

Class Renewal Survey No. I Class Renewal Survey No. II
and Subsequent
Age < 5 5 < Age < 10
Age > 10
– All air pipe heads located on
the exposed decks in the
– Two air pipe heads, one port
forward 0,25L.
and one starboard, located on
All air pipe heads located on the
the exposed decks in the
– At least 20% of air pipe heads exposed decks
forward 0,25L, preferably air
on the exposed decks serving
pipes serving ballast tanks.
spaces aft of 0,25L, preferably
air pipes serving ballast tanks

– Two air pipe heads, one port

and one starboard, on exposed
decks, serving spaced aft of
0,25L, preferably air pipes
serving ballast tanks.
(1) (2) (1) (2) (3)
(1) The selection of air pipe heads to be examined is left to the attending Surveyor.
(2) According to the results of this examination, the Surveyor may require the examination of other heads located on the
exposed decks.
(3) Exemption may be considered for air pipe heads where there is substantial evidence of replacement after the last Class
Renewal Survey.

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1.3.3 Continuous Class Renewal Surveys

.1 Continuous Class Renewal Survey may be requested separately for the hull, the machinery and the
special equipment.
.2 These following requirements are not applicable for Single or double skin Oil Tankers, Single or double
skin Bulk Carriers, Chemical Tankers and General dry cargo ship.

1) The complete survey of the hull to meet the requirements of the Hull Class Renewal Survey, can be
carried out on the Continuous Survey System basis, when, at request of an owner it has been agreed
by BKI 2) .

2) When such a system is adopted all the requirements of the particular Hull Class Renewal Survey must
be completed at the end of the five-year class period.

3) During each survey cycle, all items are to be surveyed (and tested, where required) in regular rotation,
as far as practicable, with uniform annual share within the five-years class period.

4) The owner is entitled to fix the sequence in which the individual items of the hull are intended to be
surveyed. However, the sequence in each survey cycle shall be linked with that of the previous one
in such a way that the interval between consecutive (in two cycles) examinations of each item should
not generally exceed five years. The survey in dry-dock may be held at any time within the five-year
class period, provided all the requirements of 1.6 are also complied with.

5) For ships more than 10 years of age, the ballast tanks are to be internally examined twice in each
five-year class period, i.e. Once within the scope of the intermediate survey and once within the
scope of the continuous system for the hull Class Renewal Survey.

6) The surveyor may extend the inspection at his discretion, to other items if the inspections carried out
revealed any defects.

7) The agreement for surveys to be carried out on a Continuous Survey System basis may be withdrawn
at discretion of BKI concerned.

.3 Continuous Machinery Survey (CMS) is a survey arrangement where the components in the machinery
list established for the ship are subject to separate surveys with intervals not exceeding five (5) years.

1.3.4 Surveys based on Planned Maintenance Systems

1) General

A) Application
a) These requirements apply to an approved Planned Maintenance Scheme for Machinery
(PMS) as an alternative to the Continuous Machinery Survey (CMS).
b) It considers surveys to be carried out on the basis of intervals between overhauls
recommended by manufacturers, documented operator’s experience and a condition
monitoring system, where fitted.
c) This scheme is limited to components and systems covered by CMS.
d) Any items not covered by PMS shall be surveyed and credited in the usual way.
B) Maintenance Intervals
In general, the intervals for PMS shall not exceed those specified for CMS. However, for
components where the maintenance is based on running hours longer intervals may be
accepted as long as the intervals are based on the manufacturer’s recommendations.
2)
Ships on the Continuous Survey System are not exempt from other periodical surveys.

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C) Onboard responsibility
a) The chief engineer shall be the responsible person on board in charge of the PMS.
b) Documentation on overhauls of items covered by the PMS shall be reported and signed by
the chief engineer.
c) Access to computerized systems for updating of the maintenance documentation and
maintenance program shall only be permitted by the chief engineer or other authorized
person.

2) Procedures and conditions for approval of a PMS

A) System Requirements
a) The PMS shall be programmed and maintained by a computerized system. However, this
may not be applied to the current already approved schemes.
b) The system shall be approved by BKI.
c) Computerized systems shall include back-up devices, such as disks/tapes, CDs, which are
to be updated at regular intervals.
B) Documentation and information
a) The following documentation shall be submitted for the approval of the scheme:
i) organization chart identifying areas of responsibility;
ii) documentation filling procedures;
iii) listing of equipment to be considered by classification in PMS;
iv) machinery identification procedure;
v) preventive maintenance sheet(s) for each machine to be considered;
vi) listing and schedule of preventive maintenance procedures.
b) In addition to the above documentation the following information shall be available on
board:
i) all clauses in B).a) above in an up-to-date fashion;
ii) maintenance instructions (manufacturer’s and shipyard’s);
iii) reference documentation (trend investigation procedures, etc.),
iv) records of maintenance including repairs and renewals carried out
C) Approval validity
a) When the PMS is approved a ”Certificate of Approval for Planned Maintenance Scheme” is
issued. However, other equivalent certification or class notation may be issued according
to the procedure in use. In any case, the certification is to be kept on board.
b) An implementation Survey shall be carried out to confirm the validity of the certificate/class
notation, see 3).A).
c) An annual report covering the year’s service including the information as required under
the clauses iii) and v) as well as the information on changes to other clauses in 2).B).a)
above, shall be reviewed by BKI.
D) An Annual Audit shall be carried out to maintain the validity of the PMS, see 3).B) below.
E) The survey arrangement for machinery under PMS can be cancelled by BKI if PMS is not being
satisfactorily carried out either from the maintenance records or the general condition of the
machinery, or when the agreed intervals between overhauls are exceeded.
F) The case of sale or change of management of the ship or transfer of class shall cause the approval
to be reconsidered.
G) The ship-owner may, at any time, cancel the survey arrangement for machinery under PMS by
informing BKI in writing and for this case the items which have been inspected under the PMS
since the last annual survey can be credited for class at the discretion of the attending surveyor.

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3) Surveys
A) Implementation Survey
a) The Implementation Survey shall be carried out by BKI’s surveyor within one year from the
date of approval of the PMS.
b) During the implementation survey the following shall be verified by a surveyor to ensure:
i) the PMS is implemented according to the approval documentation and is adapted to
the type and complexity of the components/system on board;
ii) the PMS is producing the documentation required for the Annual Audit and the
requirements of surveys and testing for retention of class are complied with;
iii) the onboard personnel are familiar with the PMS.
c) When this survey is carried out and the implementation is found in order, a report
describing the PMS shall be submitted to BKI and the approved PMS may replace the CMS.
B) Annual Audit3)
a) An annual audit of the PMS shall be carried out by BKI’s surveyor and preferably
concurrently with the annual survey of machinery.
b) The surveyor shall review the annual report or verify that it has been reviewed by BKI.
c) The purpose of this survey shall be to verify that the scheme is being correctly operated
and that the machinery has been functioning satisfactorily since the previous survey. A
general examination of the items concerned shall be carried out.
d) The performance and maintenance records shall be examined to verify that the machinery
has functioned satisfactorily since the previous survey or action has been taken in response
to machinery operating parameters exceeding acceptable tolerances and the overhaul
intervals have been maintained.
e) Written details of break-down or malfunction shall be made available.
f) Description of repairs carried out shall be examined. Any machinery part, which has been
replaced by a spare one, due to damage, is to be retained on board — where possible —
until examined by BKI’s Surveyor.
g) Upon satisfactory completion of the above requirements, BKI shall retain the PMS.
C) Damage and repairs
a) The damage of components/machinery shall be reported to BKI. The repairs of such
damaged components / machinery shall be carried out to the satisfaction of BKI’s surveyor.
b) Any repair and corrective action regarding machinery under PMS system shall be recorded
in the PMS logbook and repair verified by BKI’s surveyor at the Annual Audit.
c) In the case of overdue outstanding recommendations or a record of unrepaired damage
which would affect the PMS the relevant items shall be kept out of the PMS until the
condition of class is fulfilled or the repair is carried out.

1.3.5 Surveys based on Condition Monitoring Systems

1) General
A) Application
a) These requirements apply to the approved Condition Monitoring (CM) and Condition Based
Maintenance (CBM) schemes where the condition monitoring results are used to influence
the scope and/or frequency of Class survey.
b) This scheme may be applied to components and systems covered by Continuous Machinery
Survey (CMS), and other components and systems as requested by the owner. The extent
of Condition Based Maintenance and associated monitoring equipment to be included in
the maintenance scheme is decided by the Owner.
3)
The term audit, in this context, is not related to ISM audit.

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c) These requirements can be applied only to vessels operating on approved PMS survey
scheme.
d) The scheme may be applied to any individual items and systems. Any items not covered by
the scheme shall be surveyed and credited in accordance with the requirements of B.1.5
and / or B.1.3.4.
B) Definitions
a) The following standard terms are defined as follows4) :
i) Condition monitoring: acquisition and processing of information and data that indicate
the state of a machine over time. The machine state deteriorates if faults or failures
occur.
ii) Diagnostic: examination of symptoms and syndromes to determine the nature of faults
or failures.
iii) Condition Based Maintenance: maintenance performed as governed by condition
monitoring programmes.
C) Condition Monitoring (CM)
a) Where an approved condition monitoring system is fitted, credit for survey may be based
on acceptable condition monitoring results. The condition monitoring results are to be
reviewed during the annual audit.
b) Limiting parameters are to be based on the Original Equipment Manufacturers guidelines
(OEM), or a recognised international standard.
c) The condition monitoring system is to provide an equivalent or greater degree of
confidence in the condition of the machinery to traditional survey techniques.
d) The condition monitoring system shall be approved in accordance with each Member
Society’s procedures.
e) A condition monitoring system may be used to provide a greater understanding of
equipment condition, and a condition based maintenance scheme may be used to obtain
maintenance efficiency. Class approval is required where owners wish to change the survey
cycle based on CM/CBM.
f) Software systems can use complex algorithms, machine learning and knowledge of global
equipment populations/defect data in order to identify acceptability for continued service
or the requirement for maintenance. These systems may be independent of the OEM
recommended maintenance and condition monitoring suggested limits. Approval of this
type of software is to be based on OEM recommendations, industry standards and Class
Society experience.
g) The Society retains the right to test or open-up the machinery, irrespective of the CM
results, if deemed necessary.
D) Condition Based Maintenance (CBM)
a) Where an owner wishes to base their equipment maintenance on a CBM approach, this is
to meet the requirements of the ISM Code.
b) Where an agreed planned maintenance and CBM scheme is in operation, the CMS and
other survey intervals may be extended based on OEM maintenance recommendations
and acceptable condition monitoring results.
c) Limiting parameters (alarms and warnings) are to be based on the OEM guidelines, or a
recognised international standard.
d) The CBM scheme is to provide an equivalent or greater degree of confidence in the
condition of the machinery to traditional maintenance techniques.
e) The scheme shall be approved in accordance with each Member Society’s procedures.
4)
See ISO 13372 : 2012

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f) Software systems can use complex algorithms, machine learning and knowledge of global
equipment populations/defect data in order to identify acceptability for continued service
or the requirement for maintenance. These systems may be independent of the OEM
recommended maintenance and condition monitoring suggested limits. Approval of this
type of software is to be based on OEM recommendations, industry standards and Class
Society experience.

2) Procedures and Conditions for approval of CM and CBM

A) Onboard Responsibility
a) The chief engineer shall be the responsible person on board in charge of the CM and CBM.
b) Documentation on the overhaul of items covered by CM and CBM schemes shall be
reported by the chief engineer.
c) Access to computerized systems for updating of the maintenance documentation and
maintenance program shall only be permitted by the chief engineer or other authorized
person.
d) All personnel involved in CM and CBM shall be appropriately qualified.
Note:
CM does not replace routine surveillance or the chief engineer’s responsibility for taking
decisions in accordance with his judgement.
B) Equipment and System Requirements
a) CM equipment and systems shall be approved in accordance with a procedure of each
individual Member Society.
b) The CM/CBM scheme and its extent, are to be approved by the Society.
c) The CBM scheme is to be capable of producing a condition report, and maintenance
recommendations.
d) A system is to be provided to identify where limiting parameters (alarms and warnings) are
modified during the operation of the scheme.
e) Where CM and CBM schemes use remote monitoring and diagnosis (i.e. data is transferred
from the vessel and analysed remotely), the system is to meet the applicable standards for
Cyber Safety and Security. The system shall be capable of continued onboard operation in
the event of loss of the communication function.
f) CBM schemes are to identify defects and unexpected failures that were not prevented by
the CM system.
g) Systems shall include a method of backing up data at regular intervals.
C) Documentation and Information
a) The following documentation shall be made available to the Society for the approval of the
scheme:
i) Procedure for changes to software system and CM parameters
ii) Listing of equipment to be included in the scheme
iii) Listing of acceptable condition monitoring parameters
iv) Description of CBM scheme
v) Listing, specifications and maintenance procedures for condition monitoring
equipment
vi) Baseline data for equipment with condition monitoring
vii) Qualification of personnel and company responsible for analysing CM results
b) In addition to the above documentation the following information shall be available on
board:
i) All clauses in 2).C).a) in an up-to-date fashion

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ii) Maintenance instructions (manufacturer’s and shipyard’s)

iii) Condition monitoring data including all data since last opening of the machine and the
original base line data
iv) Reference documentation (trend investigation procedures etc.)
v) Records of maintenance including repairs and renewals carried out
vi) Records of changes to software systems and parameters
vii) Sensors calibration records / certification / status
D) Approval validity
a) An Annual Audit shall be carried out to maintain the validity of the CM/CBM scheme.
b) The survey arrangement for machinery under CM/CBM can be cancelled by the Society if
the scheme is not being satisfactorily carried out either from the maintenance records or
the general condition of the machinery.
c) The case of sale or change of management of the ship or transfer of class shall cause the
approval to be reconsidered.
d) The ship owner may, at any time, cancel the survey arrangement for machinery under the
scheme by informing the Society in writing and for this case the items which have been
inspected under the scheme since the last annual Audit can be credited for class at the
discretion of the attending surveyor.
3) Surveys
A) Installation Survey
a) Condition monitoring equipment is to be installed and surveyed in accordance with class
society rules, and a set of base line readings is to be taken.
B) Implementation Survey
a) The Implementation Survey shall be carried out by the Society’s surveyor no earlier than 6
months after installation survey and no later than the first Class annual survey.
b) During the Implementation survey the following shall be verified by a surveyor:
i) the CM/CBM scheme is implemented according to the approval documentation,
including a comparison with baseline data;
ii) the scheme is producing the documentation required for the Annual Audit and the
requirements of surveys and testing for the maintenance of class are complied with;
iii) the onboard personnel are familiar with operating the scheme.
iv) records of any limiting parameters (alarms and warnings) that have been modified
during the operation of the scheme.
v) Records of any failures of monitored equipment are to be reviewed to ensure that the
condition monitoring scheme is effective / sufficient.
c) When this survey is carried out and the implementation is found in order, a report
describing the scheme shall be submitted to the Society and the scheme may be put into
service.
C) Annual Audit
a) An annual audit of the CM and CBM scheme shall be carried out by a Society’s surveyor
concurrently with the Class annual survey.
b) The purpose of this audit shall be to verify that the scheme is being correctly operated and
that the machinery has been functioning satisfactorily since the previous audit. This is to
include any limiting parameters (alarms and warnings) that have been modified since the
last audit. A general examination of the items concerned shall be carried out.
c) The performance, condition monitoring and maintenance records shall be examined to
verify that the machinery has functioned satisfactorily since the previous survey, or action
has been taken in response to machinery operating parameters exceeding acceptable
tolerances.

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d) Written details of break-down or malfunction shall be made available.

e) At the discretion of the surveyor, function tests, confirmatory surveys and random check
readings, where Condition Monitoring / Condition Based Maintenance equipment is in use,
shall be carried out as far as practicable and reasonable.
f) The familiarity of the chief engineer and other personnel involved with the CM system shall
be verified.
g) Calibration status of sensors and equipment shall be verified.
h) Verification that the suitability of the CM/CBM scheme has been reviewed following defects
and failures shall be carried out.
D) Damage and repairs
a) Damage to components or items of machinery is to be reported to the Society. The repairs
of such damaged components or items of machinery are to be carried out to the satisfaction
of the Surveyor.
b) Details of repairs and maintenance carried out shall be examined. Any machinery part,
which has been replaced by a spare one, due to damage, is to be retained on board where
possible until examined by the Society’s Surveyor.
c) Defect and failure data is to be reviewed in order to ensure the system output is
appropriate. Where necessary, following review of the failure data, there is to be a method
of amending the CM and CBM scheme.

1.3.6 Requirements for Ships not Applying Planned Maintenance Systems, Condition Monitoring
Systems and/or Continuous Machinery Survey
1) Inspection of machinery items in this section uses 2 (two) inspection methods as follows:

A) Method 1: Visual inspection by opening up fully or partly as deemed necessary by the surveyor.
Function testing and or pressure testing shall be carried out when relevant.
B) Method 2: Examine visually without dismantling. Performance test shall be carried out. Open
up if deemed necessary. Verify last overhaul.

2) List of machinery items that shall be examined is indicated below (Table 3.5):

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Table 3.5 Table of Machinery Items Examination

Systems Components Examination method

Propulsion drivers: diesel engines 1
Propulsion drivers: steam turbines 1
Propulsion drivers: gas turbines See Notes 6
Propulsion drivers: electric power units (electric
Propulsion systems
motors and frequency converters) and 2
hydraulic motors
Thrust shafts, intermediate shafts, shaft
bearings, clutches, couplings and vibration 2
dampers (torsional and axial)
Gears: Shafts, pinions, wheels, power take offs,
2
power take ins
Controllable pitch propeller servo mechanism 2
Controllable pitch propeller hydraulic power
2
system
Generator drivers: diesel engines 1
Generator drivers: steam turbines 1
Main and emergency Generator drivers: gas turbines See Notes 6
electric power systems Generators 2
Shafts, clutches, couplings and vibration
2
dampers (torsional and axial)
Gears: Shafts, pinions, wheels, power take offs,
2
power take ins
Heat exchangers 1
Pipes, valves and filters inside machinery space 2
Pumps 2
Feed water, steam and
Pump drivers: electric motors 2
condensate systems
Pump drivers: steam turbines 1
Condensers 1
Fresh water generators (only for steam turbine
1
propulsion)
Fuel1,2 and lubrication oil Heat exchangers 1
systems Pipes, valves, filters, pumps and pump drivers 2
Incineration
Incinerator 1
system
Pumps and heat exchangers 1
Sea water systems
Pipes, valves, filters and pump drivers 2
Heat exchangers 1
Fresh water systems
Pipes, valves, filters, pumps and pump drivers 2
Pumps and ejectors 1
Bilge systems
Pipes, valves and filters inside machinery space,
2
and pump drivers
Compressors 2
Compressed air systems Air receivers 1
Pipes, valves and filters inside machinery space 2
Exhaust gas NOx and SOx
cleaning systems,
Pipes, valves, filters, pumps and pump drivers3 2
treatment
fluid circuits
Exhaust gas system4 Fans and fan drivers 1

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Table 3.5: Table of Machinery Items Examination (continued)

Systems Components Examination method
Inert gas system 5 Pumps and fans 2
Cargo piping system Compressors 1
Cargo tanks cleaning system Pump, fan and compressor drivers: diesel
1
Cargo refrigeration system engines and steam turbines
Cargo regasification system Pump, fan and compressor drivers: electric and
2
Cargo reliquefaction system hydraulic motors
Pump, fan and compressor drivers hydraulic
2
power systems
Heat exchangers, scrubbers and vaporizers 1
Pipes, valves and filters 2
Notes :
1. Independent of the type of fuel; fuel oil, fuel gas, low flashpoint liquid, etc
2. Where necessary, insulation material shall be dismantled to facilitate inspection.
3. The sides of non-return valves, and pumps exposed to fluids having corrosive or etching properties
shall be surveyed according to method 1.
4. Function test of fan only.
5. Independent of the type of inert gas or purpose, except for fire fighting purposes.
6. For ships with gas turbine installations the survey shall include verification of records and general
overhaul reports onboard.
General Overhaul on gas turbines shall be performed by either the original equipment manufacturer
(OEM) or an OEM authorized company.

1.3.7 Class Extension Survey

See 1.3.1 and 1.6.1.2).

1.4 Periodical surveys of propeller shafts and tube shafts, propellers, vane wheels and other systems

For maintenance of the Class, periodical surveys and tests of propeller shafts and tube shafts, propellers,
vane wheels and other systems of seagoing ships are to be carried out.

1.4.1 Propeller shafts and tube shafts

Unless alternative means are provided to assure the condition of the propeller shaft assembly, these
requirements apply to all vessels with conventional shafting fitted with a propeller as follows:

— from 1 January 2016 for ships delivered on or after 1 January 2016;

— after the first shaft survey scheduled on or after 1 January 2016, for ships delivered before 1 January
2016.

1) Oil lubricated shafts

A) Survey intervals (see Table 3.6)

For surveys completed within 3 months before the shaft survey due date, the next period will
start from the shaft survey due date.
a) Flanged propeller connection
The following Methods are applicable:
i) Method 1 every 5 years, or

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ii) Method 2 every 5 years (pre- requisites have to be fulfilled), or

iii) Method 3 every 5 years (pre-requisites have to be fulfilled).
b) Keyless propeller connection
The following Methods are applicable:
i) Method 1 every 5 years, or
ii) Method 2 every 5 years (pre- requisites have to be fulfilled), or
iii) Method 3 every 5 years (pre-requisites have to be fulfilled). The maximum interval
between two surveys carried out according to Method 1 or Method 2 shall not exceed
15 years, except in the case when one extension for no more than three months is
granted.
c) Keyed propeller connection
The following Methods are applicable:
i) Method 1 every 5 years, or
ii) Method 2 every 5 years (pre- requisites have to be fulfilled)
B) Survey extensions (see Table 3.6)
For all types of propeller connections, the interval between two consecutive surveys may be
extended after the execution of extension survey as follows:
a) Extension up to a maximum of 2,5 years: no more than one extension can be granted. No
further extension, of other type, can be granted.
b) Extension up to a maximum of 1 year: no more than two consecutive “one year extensions”
can be granted. No further extension, of other type, can be granted.
In the event an additional extension is requested, the requirements of the “2,5 year
extension” are to be carried out and the shaft survey due date, prior to the previous
extension(s), is extended for a maximum of 2,5 years.
c) Extension up to a maximum of 3 months: no more than one “three months extension”
can be granted. In the event an additional extension is requested, the requirements of the
“one year extension” or “2,5 years extension” are to be carried out and the shaft survey
due date, prior to the previous extension, is extended for a maximum of one year or 2,5
years.

The extension survey should normally be carried out within 1 month of the shaft survey due
date and the extension counts from the shaft survey due date.
If the extension survey is carried out more than 1 month prior to the shaft survey due date, then
the period of extension counts from the date of the extension survey was completed

2) Closed loop system fresh water lubricated shafts

The maximum interval between two surveys carried out according to Method 1 shall not exceed 15
years. An extension for no more than three months can be granted.

A) Survey intervals (see Table 3.6)

For surveys completed within 3 months before the shaft survey due date, the next period will
start from the shaft survey due date.
a) Flanged propeller connection
The following Methods are applicable:
i) Method 1 every 5 years, or
ii) Method 2 every 5 years (pre- requisites have to be fulfilled), or
iii) Method 3 every 5 years (pre-requisites have to be fulfilled).

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b) Keyless propeller connection

The following Methods are applicable:
i) Method 1 every 5 years, or
ii) Method 2 every 5 years (pre- requisites have to be fulfilled), or
iii) Method 3 every 5 years (pre-requisites have to be fulfilled).
c) Keyed propeller connection
The following Methods are applicable:
i) Method 1 every 5 years, or
ii) Method 2 every 5 years (pre- requisites have to be fulfilled)
B) Survey extensions (see Table 3.6)
For all types of propeller connections, the interval between two consecutive surveys may be
extended after the execution of extension survey as follows:
a) Extension up to a maximum of 2,5 years: no more than one extension can be granted. No
further extension, of other type, can be granted.
b) Extension up to a maximum of 1 year: no more than two consecutive “one year extensions”
can be granted. No further extension, of other type, can be granted.
In the event an additional extension is requested, the requirements of the “2,5 year
extension” are to be carried out and the shaft survey due date, prior to the previous
extension(s), is extended for a maximum of 2,5 years.
c) Extension up to a maximum of 3 months: no more than one “three months extension”
can be granted. In the event an additional extension is requested, the requirements of the
“one year extension” or “2,5 years extension” are to be carried out and the shaft survey
due date, prior to the previous extension, is extended for a maximum of one year or 2,5
years.

The extension survey should normally be carried out within 1 month of the shaft survey due
date and the extension counts from the shaft survey due date.
If the extension survey is carried out more than 1 month prior to the shaft survey due date, then
the period of extension counts from the date of the extension survey was completed
The maximum interval between two surveys carried out according to Method 1 shall not exceed
15 years, except in the case when one extension for no more than three months is granted.

3) Water Lubricated shafts (open systems)

A) Survey intervals (see Table 3.7)

The following survey intervals between surveys according to Method 4 are applicable to all types
of propeller connections.
— For keyless propeller connections, the maximum interval between two consecutive
dismantling and verifications of the shaft cone by means of non-destructive examination
(NDE) shall not exceed 15 years.
— For surveys completed within 3 months before the shaft survey due date, the next period
will start from the shaft survey due date.
a) Configurations allowing 5 year intervals
i) Single shaft operating exclusively in fresh water.
ii) Single shaft provided with adequate means of corrosion protection, single corrosion
resistant shaft.
iii) All kinds of multiple shafts arrangements.

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b) Other systems
Shaft not belonging in one of the configurations listed in 3).A).a) above has to be surveyed
according to Method 4 every 3 years.
B) Survey extensions (see Table 3.7)
For all types of propeller connections, the interval between two consecutive surveys may be
extended after the execution of extension survey as follows:
a) Extension up to a maximum of 1 year: no more than one extension can be granted. No
further extension, of other type, can be granted.
b) Extension up to a maximum of 3 months: no more than one “three months extension” can
be granted. In the event an additional extension is requested the requirements of the “one
year extension” are to be carried out and the shaft survey due date prior to the previous
extension is extended for a maximum of one year.
The extension survey should normally be carried out within 1 month of the shaft survey due
date and the extension counts from the shaft survey due date.
If the extension survey is carried out more than 1 month prior to the shaft survey due date, then
the period of extension counts from the date of the extension survey was completed.

Table 3.6 Table of Survey Intervals (closed systems)

SURVEY INTERVALS (closed systems)

Oil Lubricated
Flanged Propeller Coupling Keyless Propeller Coupling Keyed Propeller Couplingb
Method 1 or Method 2 or Method 1 or Method 2 or
Every five yearsa Method 1 or Method 2
Method 3 Method 3c
Extension 2,5 Y Yesd Yes d Yesd
Extension 1 Y Yese Yes e Yese
Extension 3 M Yesf Yesf Yesf
Closed Loop Systems Fresh Water Lubricated
Flanged Propeller Coupling Keyless Propeller Coupling Keyed Propeller Couplingb
g
Method 1 or Method 2 or g
Method 1 or Method 2 or
Every five yearsa Method 1g or Method 2
Method 3 Method 3
Extension 2,5 Y Yesd Yesd Yesd
Extension 1 Y Yese Yese Yese
Extension 3 M Yesf Yes f Yesf
General notes :
For surveys (Method 1, or Method 2, or Method 3) completed within 3 months before the shaft survey due date,
the next period will start from the shaft survey due date.
The extension survey should normally be carried out within 1 month of the shaft survey due date and the
extension counts from the shaft survey due date. If the extension survey is carried out more than 1 month prior to
the shaft survey due date, then the period of extension counts from the date of the extension survey was
completed.
Notes :
a. Unless an Extension type (Extension 2,5 Y, Extension 1 Y, Extension 3 M) is applied in between.
b. Method 3 not allowed.
c. The maximum interval between two surveys carried out according to Method 1 or Method 2 shall not
exceed 15 years, except in the case when one extension for no more than three months is granted.
d. no more than one extension can be granted. No further extension of other type can be granted.
e. no more than two consecutive extensions can be granted. In the event an additional extension is requested
the requirements of the “2,5 year extension” are to be carried out and the shaft survey due date, prior to the
previous extension(s), is extended for a maximum of 2,5 years.
f. no more than one three months extension can be granted. In the event an additional extension is requested the
requirements of the “one year extension” or “2,5 years extension” are to be carried out and the shaft
survey due date, prior to the previous extension, is extended for a maximum of one year or 2,5 years.
g. The maximum interval between two surveys carried out according to Method 1 shall not be more than 15 years.

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Table 3.7 Table of Survey Interval (open system)

SURVEY INTERVALS (open systems)

- Single Shaft operating exclusively in Fresh Water. Other shaft configuration.
- Single Shaft provided with adequate means of
corrosion protection, Single corrosion resistant shaft.
- All kinds of Multiple shafts arrangements.
All kinds of Propeller Couplingd All kinds of Propeller Couplingd
Every five yearsa Method 4 Every three yearsa Method 4
Extension 1 Y Yesb Extension 1 Y Yesb
Extension 3 M Yesc Extension 3 M Yesc
General notes:
For surveys (Method 4) completed within 3 months before the shaft survey due date, the next period will start from the shaft
survey due date.
The extension survey should normally be carried out within 1 month of the shaft survey due date and the extension counts from
the shaft survey due date. If the extension survey is carried out more than 1 month prior to the shaft survey due date, then the
period of extension counts from the date of the extension survey was completed.
Notes:
a. Unless an Extension type (Extension 1 Y, Extension 3 M) is applied in between.
b. No more than one extension can be granted. No further extension, of other type, can be granted.
c. No more than one extension can be granted. In the event an additional extension is requested the requirements of the one
year extension are to be carried out and the shaft survey due date prior to the previous extension is extended for a maximum
of one year.
d. For keyless propeller connections the maximum interval between two consecutive dismantling and verifications of the shaft
cone by means of non-destructive examination (NDE) shall not exceed 15 years.

1.4.2 Shaft Survey Methods

1) Oil Lubricated shafts or Closed Loop System Fresh Water Lubricated Shafts (closed system)

A) METHOD 1
The survey is to consist of:
a) Drawing the shaft and examining the entire shaft, seals system and bearings
b) For keyed and keyless connections:
i) Removing the propeller to expose the forward end of the taper,
ii) Performing a non-destructive examination (NDE) by an approved surface
crack-detection method all around the shaft in way of the forward portion of
the taper section, including the keyway (if fitted). For shaft provided with liners the
NDE shall extended to the after edge of the liner.
c) For flanged connection:
i) Whenever the coupling bolts of any type of flange-connected shaft are removed or the
flange radius is made accessible in connection with overhaul, repairs or when deemed
necessary by the surveyor, the coupling bolts and flange radius are to be examined by
means of an approved surface crack detection method.
d) Checking and recording the bearing clearances.
e) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
f) Verification of the satisfactory conditions of inboard and outboard seals during the re-
installation of the shaft and propeller.
g) Recording the bearing wear down measurements (after re-installation)

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B) METHOD 2
The survey is to consist of:
a) For keyed and keyless connections:
i) Removing the propeller to expose the forward end of the taper,
ii) Performing a non-destructive examination (NDE) by an approved surface
crack-detection Method all around the shaft in way of the forward portion of
the taper section, including the keyway (if fitted).
b) For flanged connection:
i) Whenever the coupling bolts of any type of flange-connected shaft are removed or the
flange radius is made accessible in connection with overhaul, repairs or when deemed
necessary by the surveyor, the coupling bolts and flange radius are to be examined by
means of an approved surface crack detection Method.
c) Checking and recording the bearing wear down measurements.
d) Visual Inspection of all accessible parts of the shafting system.
e) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
f) Seal liner found to be or placed in a satisfactory condition.
g) Verification of the satisfactory re-installation of the propeller including verification of
satisfactory conditions of inboard and outboard seals.

Pre-requisites to satisfactorily verify in order to apply METHOD 2:

a) Review of service records.
b) Review of test records of:
i) Lubricating Oil analysis (for oil lubricated shafts), or
ii) Fresh Water Sample test (for closed system fresh water lubricated shafts).
c) Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed
system fresh water lubricated).
d) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
C) METHOD 3
The survey is to consist of:
a) Checking and recording the bearing wear down measurements.
b) Visual Inspection of all accessible parts of the shafting system.
c) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
d) Seal liner found to be or placed in a satisfactory condition.
e) Verification of the satisfactory conditions of inboard and outboard seals.

Pre-requisites to satisfactorily verify in order to apply METHOD 3:

a) Review of service records.
b) Review of test records of:
i) Lubricating Oil analysis (for oil lubricated shafts), or
ii) Fresh Water Sample test (for closed system fresh water lubricated shafts).
c) Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed
system fresh water lubricated).
d) Verification of no reported repairs by grinding or welding of shaft and/or propeller.

2) Shaft extension surveys - Extension types

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A) Extension up to 2,5 years

The survey is to consist of:
a) Checking and recording the bearing wear down measurements, as far as practicable.
b) Visual Inspection of all accessible parts of the shafting system.
c) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
d) Verification of the effectiveness of the inboard seal and outboard seals.

Pre-requisites to satisfactorily verify in order to apply EXTENSION UP TO 2,5 YEARS:

a) Review of service records.
b) Review of test records of
i) Lubricating Oil analysis (for oil lubricated shafts), or
ii) Fresh Water Sample test (for closed system fresh water lubricated shafts).
c) Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed
system fresh water lubricated).
d) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
e) Confirmation from the Chief Engineer that the shafting arrangement is in good working
condition.
B) Extension up to 1 year
The survey is to consist of:
a) Visual Inspection of all accessible parts of the shafting system.
b) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
c) Verification of the effectiveness of the inboard seal and outboard seals.

Pre-requisites to satisfactorily verify in order to apply EXTENSION UP TO 1 YEAR:

a) Review of the previous wear down and/or clearance recordings.
b) Review of service records.
c) Review of test records of
i) Lubricating Oil analysis (for oil lubricated shafts), or
ii) Fresh Water Sample test (for closed system fresh water lubricated shafts).
d) Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed
system fresh water lubricated).
e) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
f) Confirmation from the Chief Engineer that the shafting arrangement is in good working
condition.
C) Extension up to 3 months
The survey is to consist of:
a) Visual Inspection of all accessible parts of the shafting system.
b) Verification of the effectiveness of the inboard seal.

Pre-requisites to satisfactorily verify in order to apply EXTENSION UP TO 3 MONTHS:

a) Review of the previous wear down and/or clearance recordings.
b) Review of service records.
c) Review of test records of
i) Lubricating Oil analysis (for oil lubricated shafts), or
ii) Fresh Water Sample test (for closed system fresh water lubricated shafts).

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d) Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed
system fresh water lubricated).
e) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
f) Confirmation from the Chief Engineer that the shafting arrangement is in good working
condition.

3) Shafts Survey Methods of Water Lubricated shafts (open systems)

A) METHOD 4
The survey is to consist of:
a) Drawing the shaft and examining the entire shaft (including liners, corrosion protection
system and stress reducing features, where provided), inboard seal system and bearings.
b) For keyed and keyless connections:
i) removing the propeller to expose the forward end of the taper,
ii) performing a non-destructive examination (NDE) by an approved surface crack-
detection Method all around the shaft in way of the forward portion of the taper
section, including the keyway (if fitted). For shaft provided with liners the NDE shall
be extended to the after edge of the liner
c) For flanged connection:
i) Whenever the coupling bolts of any type of flange-connected shaft are removed or the
flange radius is made accessible in connection with overhaul, repairs or when deemed
necessary by the surveyor, the coupling bolts and flange radius are to be examined by
means of an approved surface crack detection method.
d) Checking and recording the bearing clearances.
e) Verification that the propeller is free of damages which may cause the propeller to be out
of balance.
f) Verification of the satisfactory conditions of inboard seal during re-installation of the shaft
and propeller.
B) Shaft extension surveys - Extension types
a) Extension up to 1 year
The survey is to consist of:
i) Visual Inspection of all accessible parts of the shafting system.
ii) Verification that the propeller is free of damages which may cause the propeller to
be-out of balance.
iii) Checking and recording the clearances of bearing.
iv) Verification of the effectiveness of the inboard seal.
Pre-requisites to satisfactorily verify in order to apply EXTENSION UP TO 1 YEAR:
i) Review of the previous clearance recordings.
ii) Service records.
iii) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
iv) Confirmation from the Chief Engineer that the shafting arrangement is in good working
condition.
b) Extension up to 3 months
The survey is to consist of:
i) Visual Inspection of all accessible parts of the shafting system.
ii) Verification that the propeller is free of damages which may cause the propeller to
be-out of balance.
iii) Verification of the effectiveness of the inboard seal.

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Pre-requisites to satisfactorily verify in order to apply EXTENSION UP TO 3 MONTHS:

i) Review of the previous clearance recordings.
ii) Service records.
iii) Verification of no reported repairs by grinding or welding of shaft and/or propeller.
iv) Confirmation from the Chief Engineer that the shafting arrangement is in good working
condition.

1.4.3 Vane wheels

Vane wheels are to be examined in dismounted condition in intervals of nominally 2,5 years with an
admissible time window of ± 6 months.

1.4.4 Other systems

Other systems for main propulsion purposes, such as rudder and steering propellers, pod propulsion
systems, pump jet units, etc., are subject to the same survey intervals as propeller shafts and tube shafts.

1.5 Periodical surveys and tests of individual machinery items

1.5.1 The periodical surveys of individual machinery items or installations listed below are to be carried
out in addition to those prescribed above, for maintenance of Class.
Surveys of machinery may be carried out on a PMS basis (see B.1.3.4) or CM / CBM basis (see B.1.3.5).
1.5.2 Steam boiler plants
Steam boilers are to be subjected to the following examinations and tests at regular intervals5) ). The term
’steam boilers’ includes exhaust gas boilers and warm water and hot water generators (except where they
are heated by steam or liquids).

1) Internal inspection

A) Water tube boilers used for main propulsion, including reheat boilers, all other boilers of
essential service, and boilers of non-essential service having working pressure exceeding 0,35
N/mm2 (3,5 bar) and a heating surface exceeding 4.5 m2 , are to be surveyed internally. The
internal inspections are to be carried out at least twice during 5-year Class Renewal Survey. In
any cases the maximum interval between any two such internal inspections shall not exceed 36
months.
B) An extension of the internal inspection of the boiler up to 3 months can be granted under
exceptional circumstances6) . The extension may be granted by BKI after the following is
satisfactorily carried out:
a) external inspection of the boiler
b) examination and functional test of the boiler safety valve relieving gear (easing gear)
c) functional test of the boiler protective devices
d) review of the following records since the last internal inspection:
i) Operational documentation
ii) Maintenance Documentation
iii) Repairs history
iv) Records of feedwater analysis
5)
For steam boiler plants on board seagoing vessels, where BKI is authorised to carry out the statutory inspections, more
extensive regulations of the country, where the ship is registered, have to be observed.
6)
See 1.6.1.2

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C) At each survey, the boilers, superheaters, and economizers are to be examined internally on
water-steam side and fire side. Boiler mountings and safety valves are to be examined at each
survey and opened out as considered necessary by BKI.
D) When direct visual internal inspection is not feasible due to the limited size of the internal
spaces, such as for small boilers and/or narrow internal spaces, this may be replaced by a
hydrostatic pressure test or by alternative verifications as determined by the BKI.
E) The adjustment of the safety valves is to be verified during each boiler internal survey. Boiler
safety valve and its relieving gear are to be examined and tested to verify satisfactory operation.
However, for exhaust gas heated economizers, if steam cannot be raised at port, the safety
valves may be set by the Chief Engineer at sea, and the results recorded in the log book for
review by the BKI.
F) Review of the following records since the last Boiler Survey is to be carried out as part of the
survey:
a) Operational documentation
b) Maintenace Documentation
c) Repairs history
d) Records of feedwater analysis

2) External inspection

External survey of boilers including test of safety and protective devices, and test of safety valve
using its relieving gear, is to be carried out annually, within the window of the Annual Survey of a
ship. For exhaust gas heated economizers, the safety valves are to be tested by the Chief Engineer
at sea within the annual survey window. This test is to be recorded in the log book for review by the
attending Surveyor prior to crediting the Annual Survey of Machinery.

3) Exhaust Gas Heated Economizers

In addition to the other requirements of 1.5.2.1).A) in exhaust gas heated economizers of the
shell type, all accessible welded joints are to be subjected to a visual examination for cracking.
Non-destructive Testing may be required for this purpose.

1.5.3 Thermal oil plants

1) Internal inspection

A) An internal inspection, including a tightness test of the whole plant, is to be performed

at intervals of 5 years, counting from commencement of initial operation, and possibly in
connection with a Class Renewal Survey.
B) During the internal inspection the heating surfaces and, where appropriate, the combustion
chamber, are to be examined for contamination, corrosion, deformations and leakages. As a
rule, tightness tests are to be carried out to the admissible working pressure. Following repairs
and renewals of plant components exposed to pressure, a pressure test is to be carried out to
1,5 times the admissible working pressure.

2) External inspection

A) Thermal oil plants are to be subjected to functional tests, while in operation. In detail, the
following items are to be examined:
— the entire thermal oil plant for leakages
— the condition of the insulation
— the functioning of the indication, control and safety equipment
— the remote controls for the shut-off and discharge valves

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— the leakage monitors for the heaters

— the emergency switch off devices (oil firing, pumps)
— the safety switch off devices for the oil burner
— lighting, emergency lighting and labeling.
B) Thermal oil plants are to be subjected to an external inspection once a year. Proof of continued
usability of the thermal oil shall be furnished yearly by a competent testing agency.
C) For the external inspection a time window of ± 3 months is admissible.

1.5.4 Steam pipes

1) Steam pipes are to be examined regularly every 5 years, possibly in connection with a class renewal
survey. Starting from Class Renewal II, the steam pipes are to be examined as to their internal and,
where advisable, as to their external condition as well, employing non-destructive testing methods,
where necessary.

2) Steam pipes with service temperatures exceeding 500 °C are to be examined for expansion at 5 year
intervals, starting from Class Renewal II, at the latest.

3) Steam pipes with steam temperatures of up to 350 °C and with outside diameters of more than 75
mm, are to be examined at random. Examinations of the internal condition of the pipelines, especially
of pipe bends, or additional more detailed examinations may be required. Instead of the internal
inspection, a hydraulic test may be affected to a pressure equal to 1,5 times the design pressure, but
not exceeding that of the prescribed test pressure for the pertinent boiler plant.

4) In the case of steam pipes with steam temperatures exceeding 350°C (at least two) selected individual
parts of pipes are to be dismounted from each piping system (main steam pipe and auxiliary steam
pipes of each service group) having an outside diameter exceeding 32 mm. Approximately 10 % of
the welding seams at bends, flanges or tee-branches are to be subjected to an inspection for cracks
by recognized non- destructive test methods.

5) Before being used again, removed screws of flanged joints are to be inspected for their general
condition and cracks and renewed, if necessary.

6) Steam pipes designed to resist steam temperatures exceeding 500°C and welded piping systems are
to be examined as follows:

A) Flanged pipes in accordance with 1.5.4.4); however, the inspection for cracks has to cover at
least 20 % of the welded seams.
B) If internal examination of welded piping systems through the inspection holes appears to be
inadequate or if their reliable assessment is not possible even by ultrasonic testing or an
equivalent examination method, it may be necessary to cut out certain parts of pipes. At least
20 % of the welding seams are to be inspected for cracks.
C) Removed screws of flanged joints, see above 1.5.4.4).

7) Heating coils in oil tanks and vessels are to be subjected to a pressure test to 1,5 times the allowable
working pressure.

The same applies to heating coils in cargo tanks.

1.5.5 Pressure vessels

1) Pressure vessels which are subject to survey by BKI according to the Construction Rules, are to be
examined internally every 5 years, possibly in connection with a Class Renewal Survey.

2) Pressure vessels having a product of pressure [bar] by cubic capacity [ l ] of p x ℓ ≤ 200 are to be
surveyed on the occasion of checking of the pertinent piping system.

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3) Periodical tests of CO2 cylinders and other gas cylinders for fire-extinguishing purposes are to be
carried out at intervals not exceeding 10 years, as follows:

At least 10 % of the gas cylinders provided are to be subjected to an internal inspection and hydrostatic
test. If one or more gas cylinders fail, a total of 50 % of the gas cylinders provided are to be subjected
to an internal inspection and hydrostatic test. If further gas cylinders fail at the extended test, all gas
cylinders are to be subjected to foregoing tests. In any case, all gas cylinders having failed shall be
replaced by new ones.

Halon containers of existing fixed Halon fire-extinguishing systems are exempted from this
requirement. Irrespective thereof, on the occasion of recharging CO2 cylinders, Halon containers
and other gas cylinders are to be tested, if the last test dates back 10 years or more.

4) Low pressure CO2 bulk storage containers are subject to internal survey if the content has been
released and the container is more than 5 years old but not more frequently than once within 5
years.

5) In the case of vessels for powder extinguishing agents, periodical pressure tests may be dispensed
with, provided that their internal inspection does not reveal any deficiencies.

6) Receivers in hydraulic or pneumatic control systems are to be examined during maintenance and
repairs at the system; air receivers with a product of pressure by cubic capacity p x ℓ > 1000 (p in bar,
ℓ in liter) are to be subjected to an internal inspection at least once during each Class period and/or
at intervals not exceeding 5 years.

7) The intervals between surveys as referred to may be reduced, depending on the findings.

8) Supplementary tests

— Where pressure vessels cannot be satisfactorily examined internally and where their
unobjectionable condition cannot be clearly recognized during the internal inspection,
recognized non-destructive test methods are to be applied and/or hydraulic pressure tests are
to be carried out.
— The hydraulic pressure test is to be performed at a test pressure of 1,5 times the maximum
allowable working pressure. If the maximum allowable working pressure is less than 2 bars,
then the test pressure should be at least 1 bar more than the maximum allowable working
pressure. Pressure vessels manufactured in accordance with DIN Standard 4810 are, subject
to that Standard, to be tested to 1,3 times the admissible working pressure. The test pressure
shall in no case exceed the initial test pressure.

1.5.6 Automation equipment

1) For confirmation of the Class Notation, machinery having been assigned the additional notations OT,
OT-nh, OT-S or OT-F is to be inspected in accordance with BKI Survey programmes during Annual,
Intermediate or Class Renewal Surveys, respectively.

2) The monitoring equipment and the automated functions of the machinery installation are to be
subjected to operational trials according to 1) above. The bridge remote control equipment of the
propulsion system will be examined as required.

1.5.7 Inert gas system

Tankers with the Class Notation INERT are to be surveyed in accordance with BKI Survey programme, at
intervals of nominally 2,5 years, preferably on the occasion of each Class Renewal and Intermediate survey.

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1.5.8 Propulsion Steam Turbines: Modification of first Class Renewal Survey

1) Where the propulsion steam turbines are of a well-known type, and fitted with rotor position
indicators and vibration indicators of an approved type, as well as measuring equipment of steam
pressure at proper locations along the steam flow, and the arrangements for change over in case of
emergency operation of the plant are readily operable, the first Class Renewal Survey may be limited
to the examination of rotor bearings, thrust bearings and flexible couplings, provided the surveyor
has been satisfied from operation service records and power trials subsequent to the survey, that the
turbine plant is in good working condition.

2) Turbine casings should be opened at the next Class Renewal Survey and subsequent Class Renewal
Surveys.

1.5.9 Machinery Verification Runs

1) As part of the Class Renewal Survey of Machinery, a dock trial is to be carried out to attending
Surveyors’ satisfaction to confirm satisfactory operation of main and auxiliary machinery. If significant
repairs are carried out to main or auxiliary machinery or steering gear, consideration should be given
to a sea trial to attending Surveyors’ satisfaction.

2) If the significant repairs as stated in 1), is considered by BKI to have any impact on response
characteristics of the propulsion systems, then the scope of sea trial shall also include a test plan
for astern response characteristics based on those required for such an equipment or systems when
fitted to the new ship. Refer to Rules for Machinery Installations (Pt.1, Vol.III) Sec.2.P for astern testing
requirements.
The tests are to demonstrate the satisfactory operation of the equipment or system under realistic
service conditions at least over the manoeuvring range of the propulsion plant, for both ahead and
astern directions.
Depending on the actual extent of the repair, BKI may accept a reduction of the test plan.

1.6 Bottom Surveys

1.6.1 Schedule
1) The Owner is to notify BKI whenever the outside of the ship’s bottom and related items can be
examined in dry-dock or on a slipway.

Examinations of the outside of the ship’s bottom and related items of ships is normally to be carried
out with the ship in dry-dock. However, consideration may be given to alternate examination while
the ship is afloat as an In-water Survey, subject to provisions of 1.7. Special consideration is to be
given to ships of 15 years or over before being permitted to have such examinations. For ESP ships
of 15 years of age and over, such examinations are to be carried out with the ship in dry-dock

2) For seagoing ships carrying the Character of Classification A100 there is to be a minimum of 2
examinations of the outside of the ship’s bottom and related items during each 5 years Class Renewal
Survey period. One such examination is to be carried out in conjunction with the Class Renewal
Survey. In exceptional circumstance7) , an extension of examination of the ship’s bottom of 3 months
beyond the due date coincide with the extension of class can be granted.

In all cases the interval between any two such examination is not to exceed 36 months and no
extension should be permitted on the period of 36 months between any two such examinations.
If the first ship’s bottom survey is carried out between 24 and 27 months then the thirty-sixth-month
limitation may prevent the certificate being extended by the periods permitted above.
7)
‘Exceptional circumstances’ means unavailability of dry-docking facilities; unavailability of repair facilities; unavailability of
essential materials, equipment or spare parts; or delays incurred by action taken to avoid severe weather conditions.

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3) Compliance with 1.6.1.2) does not absolve the Owner from compliance with the requirements of
SOLAS as amended, especially when shorter intervals between examination of the ship’s bottom for
certain types of ship are required.

4) The interval between examinations of the outside of the ship’s bottom and related items for ships
operating in fresh water and for certain harbour or non-self-propelled craft may be greater than that
given in 1.6.1.2).

5) Seagoing ships which carries more than 12 passengers are to be presented for bottom survey within
3 months before the due date of annual survey. See also 1.7.2.

6) It is expected that also for each Bottom Survey performed in addition to the Bottom Surveys stipulated
by the classification requirements the Surveyor will be called to attend.

7) The surveys may be carried out on the occasion of a scheduled Intermediate Survey unless for ships
referred to in 1.6.1.5). The date of last bottom survey is the date in which bottom survey is concluded.

8) If a Bottom Survey is intended to be credited to a Class Renewal, all tests of hull and machinery
prescribed for the respective Class Renewal and usually requiring dry-docking will have to be carried
out.

A Bottom Survey for Class Renewal may be carried out up to 15 months before completion of the
Class Renewal.

9) Bottom surveys at an “Extended dry-dock interval” can be credited as IW survey during Intermediate
and Class Renewal Surveys in terms of the 7,5 years interval, see B.1.8.

10) For Oil Tankers, Combination Carriers, Bulk Carriers, Chemical Tankers, Double Hull Oil Tankers,
Double Side Skin Bulk Carriers and General Dry Cargo Ships, and Liquefied Gas Carriers reference
is also being made to Section 4 as applicable.

1.6.2 Scope of survey

1) When a ship is in dry-dock or on a slipway, it is to be placed on blocks of sufficient height and with
the necessary staging to permit the examination of elements such as shell plating including bottom
and bow plating, stern frame and rudder, sea chests and valves, propeller, etc.

2) The shell plating is to be examined for excessive corrosion, or deterioration due to chafing or contact
with the ground and for any undue unfairness or buckling. Special attention is to be paid to the
connection between the bilge strakes and the bilge keels. Important plate unfairness or other
deterioration which do not necessitate immediate repairs are to be recorded.

3) Sea chests and their gratings, sea connections and overboard discharge valves and cocks and their
fastenings to the hull or sea chests are to be examined. Valves and cocks need not be opened up
more than once in a Class Renewal Survey period unless considered necessary by the Surveyor.

4) Visible parts of rudder, rudder pintles, rudder shafts and couplings and stern frame are to be
examined. If considered necessary by the Surveyor, the rudder is to be lifted or the inspection plates
removed for the examination of pintles. The clearance in the rudder bearings is to be ascertained
and recorded. Where applicable, pressure test of the rudder may be required as deemed necessary
by the surveyor.

5) Visible parts of propeller and stern bush, are to be examined. The clearance in the stern bush and
the efficiency of the oil gland, if fitted, are to be ascertained and recorded. For controllable pitch
propellers, the Surveyor is to be satisfied with the fastenings and tightness of hub and blade sealing.
Dismantling need not to be carried out unless considered necessary by the Surveyor.

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6) Visible parts of side thrusters are to be examined. Other propulsion systems which also have
manoeuvring characteristics (such as directional propellers, vertical axis propellers, water jet units)
are to be examined externally with focus on the condition of gear housing, propeller blades, bolt
locking and other fastening arrangements. Sealing arrangement of propeller blades, propeller shaft
and steering column shall be verified.

Note:
For the survey of propeller shafts, refer to 1.4.

1.7 In-Water Surveys

1.7.1 General
1) For ships assigned the Additional Class Notation IW, an In-Water Survey performed with the
assistance of an approved diving firm may be recognized as a substitute for every first periodical
Dry Docking Survey.

The IW may only be assigned to the seagoing ship carrying character of class A100.

2) The In-Water Survey is to provide the information normally obtained from a Docking Survey Special
consideration shall be given to ascertaining rudder bearing clearances and stern bush clearances of
oil stern bearings based on a review of the operating history, on board testing and stern oil sample
reports. These considerations are to be included in the proposals for In-Water Survey which are to
be submitted in advance of the survey so that satisfactory arrangements can be agreed with BKI.

3) On request of the owner an In-Water Survey in lieu of every first periodical Dry-Docking Survey may
only be carried out for ships without the Class Notation IW, provided that the technical requirements
are full filled and with the assistance of an approved diving firm. The final permission will be given
by BKI Head Office.

1.7.2 Bottom survey for Passenger ships with Class notation IW

1) In general, bottom survey shall be carried out in dry-dock. For ships having the Class Notation IW the
inspections of the outside of the ship’s bottom are to be carried out in dry-dock at least twice in any
5 year period. In all cases, the interval between bottom inspections shall not exceed 36 months.

The remaining yearly bottom surveys that are not conducted in dry-dock may be carried out with the
ship afloat by an approved diving company provided that the vessel has not sustained any grounding
or contact damage since the previous bottom survey.

2) The bottom survey, regardless of method, should be carried out within the allowable time window
(i.e., within 3 months before the due date of Annual survey).

Additionally, bottom survey conducted afloat should only be carried out when the conditions are
satisfactory and the proper equipment and suitably qualified staff is available. Rudder bearing
clearances need not be taken at the afloat inspections.

3) Where acceptable to the Administration, the minimum number of bottom survey in dry-dock of a
passenger ship (which is not a Ro-Ro passenger ship) in any five-year period may be reduced from
two to one8) . In such cases the interval between consecutive inspections in dry-dock should not
exceed 60 months.
8)
Refer to the Guidelines for the assessment of technical provisions for the performance of an in-water survey in lieu of bottom
inspection in dry-dock to permit one dry-dock examination in any five-year period for passenger ships other than ro-ro passenger
ships (MSC.1/Circ.1348)

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4) Special consideration should be given to ships of 15 years of age or over prior to permission being
granted to carry out an In-Water Survey in lieu of a Dry-Docking Survey.

5) More extensive Flag State requirements regarding the substitution of the bottom survey in dry-dock
by an in-water survey shall be observed.

1.7.3 Performance of survey

1) The In-water Survey is to be carried out under the surveillance of a surveyor by an in-water survey firm
approved by BKI as a service supplier according to Rules for Approval of Manufacturers and Service
Suppliers (Pt.1, Vol.XI) Sec.3, C.

2) Validity of an approval granted will depend on the continued qualification for satisfactorily carrying
out the work required. The approval will have to be renewed after a period not exceeding 3 years.

3) Unless accessible from outside with the aid of the vessel’s trim and/or heel, underwater parts are to
be surveyed and/or relevant maintenance work is to be carried out with assistance by a diver whose
performance is controlled by the Surveyor, using an underwater camera with monitor, two–way
communication and recording systems.

4) The In-water Survey is to be carried out with the ship in sheltered water and preferably with weak
tidal streams and currents. The in-water visibility and the cleanliness of the hull below the waterline
is to be clear enough to permit a meaningful examination which allows the surveyor and the in-water
survey firm to determine the condition of the plating, appendages and the welding. BKI is to be
satisfied with the methods of orientation of the divers or Remotely Operated Vehicle (ROV) on the
plating, which should make use where necessary of permanent markings on the plating at selected
points.

5) The equipment, procedure for observing and reporting the survey are to be discussed with the parties
involved prior to the In-water Survey, and suitable time is to be allowed to permit the in-water survey
firm to test all equipment beforehand.

6) The underwater pictures on the surface monitor screen shall offer reliable technical information such
as to enable the Surveyor to judge the parts and/ or the areas surveyed.

7) Documentation suited for video reproduction including voice is to be made available to BKI.

1.7.4 Additional examinations

1) Where, for instance, grounding is assumed to have taken place, the Surveyor may demand individual
parts of the underwater body to be additionally inspected from inside.

2) If during the in-water survey damages are found which can be assessed reliably only in dry-dock or
require immediate repair, the vessel is to be dry docked. If the coating of the underwater body is in
a condition which may cause corrosion damages affecting vessel’s class to occur before the next dry
docking, the vessel is to be dry docked.

1.8 Extended Dry-docking scheme (EDD)

1.8.1 Subject to provisions outlined below, Guidance for Marine Industry (Pt.1, Vol.AC) Sec.7.R-133, and
any additional specific Flag Administration requirements, the dry-docking interval can be extended with the
approval of the ship’s Flag Administration to 7,5 years.

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1.8.2 The extended Dry Docking Scheme is in any case subject to approval by the relevant Flag State. The
“Extended dry-dock interval” generally applies to container ships. The following ships and ship types are
not eligible for the extended dry-docking scheme:
A) Passenger Ships;
B) Ships subject to the Enhanced Survey Program (ESP);
C) General dry cargo ships (see Section 4-II);
D) Ships fitted with propulsion thrusters;
E) Ships where the propeller connection to the shaft is by means of a keyed taper;
F) High Speed Craft (HSC).
1.8.3 At the 7,5 years interval it is possible to perform the first two forthcoming bottom surveys as
underwater survey in the scope of an in-water survey. The third bottom survey at 7,5 years has to be
performed in dry-dock. The interval is independent whether the bottom survey will be performed at an
Intermediate or Class renewal survey.
A) The In-Water Survey should be carried out in accordance with 1.7
B) An in-water survey plan should be submitted to the BKI for review in advance of the survey and should
include the following:
a) Scheduled time and location for survey;
b) Name of approved diving company;
c) Means for cleaning of the hull below waterline;
d) Means of access for examination of sea chests, sea valves and box coolers;
e) Provisions for determining the condition of anchoring equipment, ranging of anchor chain
cables and examination of the chain lockers when due for survey and/or as required by the
surveyor;
f) Provisions for surveying and maintaining sea connections including thickness measurements of
sea chests;
g) Results of inspections by the Owner’s personnel of double bottom/double side ballast tanks
(during the last 3 years) and other spaces adjacent to the shell with reference to structural
deterioration in general, leakages in tank boundaries and piping and condition of the protective
coating;
h) Conditions for internal examination of double bottom/double side ballast tanks (e.g.,
information regarding tank cleaning, gas freeing, ventilation, lighting, etc.).
C) Prior to commencement of the in-water survey, a survey planning meeting is to be held for the
purpose of ascertaining that all the arrangements envisaged in the survey plan are in place, so as
to ensure the safe and efficient conduct of the survey work to be carried out.
D) If the In-Water Survey reveals damage, deterioration or other conditions that requires early attention,
the surveyor may require that the ship be dry-docked in order that a detailed survey can be
undertaken and necessary repairs carried out.
E) If the coating condition in double bottom/double side ballast tanks, void spaces and dry spaces is
found in less than GOOD condition, the owner is to restore the coating to GOOD.
1.8.4 The dry-docking scheme will operate based upon the ship’s age when entering the scheme.
For ships already in service, the extended dry-docking scheme may be implemented at any time until a ship
reaches 10 years of age.
No extensions are to be granted for the dry-docking required at the end of each extended dry-dock interval.

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1.8.5 Prior to acceptance into an EDD scheme, the owner is to submit the following information:
1) Provisions for carrying out maintenance required on electric/electronic sensors e.g. Echo-sounder,
Doppler-Log, Speed-log (propeller speed-log or backpressure speed-log), seawater temperature
gauges, electronic draught reading, etc.;
2) Provisions for maintaining the draft marks fore, aft and midships as well as Load line marks (painted
and welded figures) and all other required hull markings;
3) Maintenance required of thrusters and stabilisers, if fitted, and provision for carrying out surveys or
maintenance or as required by the surveyor;
4) Service experience to-date with hull coating system covered by manufacturer’s guarantee that the
underwater coatings used are designed to last for the extended period since the coating is to remain
effective for the extended dry docking period;
5) Impressed cathodic protection system or provisions for renewal of external hull sacrificial anodes in
the afloat condition.
1.8.6 Prior to acceptance into an EDD scheme, ships enrolled an extended dry-docking interval scheme
should comply with the following provisions:
1) The ship should comply with the In-Water Survey provisions, rudder and shafting systems to be
inspectable during in-water survey.
2) Protective coating in double bottom/double side ballast tanks, void spaces and all other spaces
adjacent to the shell should be maintained in GOOD condition;
3) The shafting arrangement should fulfil the applicable requirements for Tail shaft Condition Monitoring
Survey Arrangement (CM-PS), shaft bearing and sealing system of approved design and regular
monitoring procedures implemented.
4) Hull maintenance scheme according to the Guidance for Hull Inspection and Maintenance Program
(Part 7, Vol. D), to be implemented in accordance with ISM requirements.
1.8.7 The dry-docking survey required for the Class Renewal Survey at 15 years of age shall be carried
out in a dry-dock. All ships in an EDD scheme shall be dis-enrolled once the ship reaches 15 years of age.
1.8.8 The Extended Dry-docking Scheme will be terminated in cases of change of the ship’s owner,
management or Flag Administration.
1.8.9 BKI may dis-enroll a ship from an EDD scheme at any time should it be found that the conditions for
maintaining this extended Dry-dock scheme are not fulfilled anymore. Once the conditions for the scheme
are no longer present, the ship will return to the normal docking interval and any due dock survey shall be
carried out by the due date.

1.9 Clearence of Rudder stock

i) Clearence of Neck bearing
0,01 · D + 2 (mm)
Maximum clearence is 4 mm.
ii) Maximum clearence of pintle bearing

Pintle diameter (d) Clearence

d <50 mm 3,0 mm
m <d <100 mm 5,0 mm
0,01 · d + 4,0 mm
d >100 mm
Maximum: 6,0 mm

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1.10 Clearence of Propeller shaft

1.10.1 Water lubricated shaft (bearing made of lignum vitae)
i) New assembly

between 0,003 · D + 0,2 (mm) and 0,004 · D + 0,5 (mm)

Where D is the diameter of shaft liner.

ii) Maximum clearence

0,01 · D + 2,5 (mm)

1.10.2 Oil lubricated shaft (white metal bearing)

i) New assembly

Clearence in general = between 0,001 · D + 0,3 (mm) to 0,001 · D + 0,5 (mm)

ii) Maximum clearence

0,0015 · D + 0,65 mm

iii) Maximum wear tolerance for shaft liner

— in the bearing area: 25 % of shaft liner thickness

— in the packing area: 50 % of shaft liner thickness

2. Non-periodical surveys
2.1 Damage and repair surveys
2.1.1 Damage and repair surveys fall due whenever the ship’s hull, machinery or electrical installations
and/or some special equipment classed have suffered a damage, which might affect the validity of the Class,
see Section 2, B.2.
2.1.2 Where damage has occurred to the ship’s hull, machinery, including the electrical plant, the
automatic/remote control systems, etc., the damaged parts are to be made accessible for inspection in
such a way that the kind and extent of the damage can be thoroughly examined and ascertained, see also
Section 2, B.2.3.
In the case of grounding, dry docking or, alternatively, an In Water Survey is required.
2.1.3 The repair measures are to be agreed with the Surveyor such as to render possible confirmation
of the Class without reservation upon completion of the repairs. In general, a confirmation of Class with
Conditions of Class, e. g. in the case of a preliminary repair (”emergency repair”), requires to be approved
by BKI Head Office.
2.1.4 Surveys conducted in the course of repairs are to be based on the latest technical knowledge and
instructions by BKI. In exceptional cases advice is to be obtained from BKI Head Office, in particular where
doubts exist as to the cause of damage.
2.1.5 For older ships, in the case of repairs and/or replacement of parts subject to classification, as
a matter of principle, the Construction Rules in force during their period of construction continue to be
applicable.
This does not apply in the case of modifications required to the structure in the light of new knowledge
gained from damage analyses, with a view to avoiding recurrence of similar damages.
2.1.6 Regarding the materials employed and certificates required, the requirements for new buildings
are applicable, see Section 2, B.3.

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2.1.7 Regarding damages or excessive wastage beyond allowable limits that affect the vessel’s Class, see
Section 2, B.3.1.1 and Section 2, B.3.1.3.

2.2 Voyage Repairs and Maintenance

2.2.1 Where repairs to hull, machinery or equipment, which affect or may affect Classification, are to
be carried out by a riding crew during a voyage, they are to be planned well in advance. A complete
repair procedure including the extent of proposed repair and the need for Surveyor’s attendance during
the voyage is to be submitted to and agreed upon by BKI reasonably in advance. Failure to notify BKI, in
advance of the repairs, may result in suspension of the vessel’s class.
2.2.2 Where in any emergency circumstance, emergency repairs are to be effected immediately, the
repairs should be documented in the ship’s log and submitted thereafter to BKI for use in determining
further survey requirements.
2.2.3 The above is not intended to include maintenance and overhaul to hull, machinery and equipment
in accordance with the recommended manufacturer’s procedures and established marine practice and
which does not require the BKI’s approval, however, any repair as a result of such maintenance and
overhauls which affects or may affect classification is to be noted in the ship’s log and submitted to the
attending Surveyor for use in determining further survey requirements.

2.3 Conversion surveys

In the case of conversions of a ship’s hull or machinery, surveys are to be conducted in accordance with the
relevant approved particulars, as in the case of new buildings, see Section 2, B.3.

2.4 Occasional Surveys

BKI reserves the right to require Occasional Surveys to be held independently of any regular surveys. Such
surveys may become necessary for examining a vessel’s technical condition and are understood to form a
part of BKI Quality Assurance System.

C. Periodic Survey of Fuel Installations on Ships other than Liquefied Gas Carriers utilizing gas
or other low flash point fuels9)
1. Application
These requirements apply to ships, other than ship carrying liquefied gas in bulk, which utilize gas or other
low flash point fuels as a fuel for propulsion prime mover/auxiliary power generation arrangements and
associated systems.
These requirements are in addition to the requirements of B.1.5 (Periodical surveys and test of individual
machinery items). These survey requirements do not cover fire protection, fire-fighting installation, and
personnel protection equipment.

2. Class Renewal Survey

2.1 General
The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey, examination,
tests and checks of sufficient extent to ensure that the fuel installations are in a satisfactory condition
and is fit for its intended purpose for the new period of class of 5 years to be assigned, subject to proper
maintenance and operation and to periodical survey application date being carried out at the due dates.

9)
These requirements are to be applied for surveys commenced on or after 1 January 2018.

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2.2 Fuel Handling and Piping

All piping for fuel storage, fuel bunkering, and fuel supply such as venting, compressing, refrigerating,
liquefying, heating storing, burning or otherwise handling the fuel and liquid nitrogen installations are to
be examined. Removal of insulation from the piping and opening for examination may be required. Where
deemed suspect, a hydrostatic test to 1,25 times the Maximum Allowable Relief Valve Setting (MARVS) for
the pipeline is to be carried out. After reassembly, the complete piping is to be tested for leaks. Where water
cannot be tolerated and the piping cannot be dried prior to putting the system into service, the Surveyor
may accept alternative testing fluids or alternative means of testing.

2.3 Fuel Valves

All emergency shut-down valves, check valves, block and bleed valves, master gas valves, remote operating
valves, isolating valves for pressure relief valves in the fuel storage, fuel bunkering, and fuel supply piping
systems are to be examined and proven operable. A random selection of valves is to be opened for
examination.

2.4 Pressure Relief Valves

i. Fuel Storage Tank Pressure Relief Valves. The pressure relief valves for the fuel storage tanks are to be
opened for examination, adjusted, and function tested. If the tanks are equipped with relief valves
with non-metallic membranes in the main or pilot valves, such non-metallic membranes are to be
replaced.

ii. Fuel Supply and Bunkering Piping Pressure Relief Valves. Pressure relief valves for the fuel supply and
bunkering piping are to be opened for examination, adjusted, and function tested. Where a proper
record of continuous overhaul and retesting of individually identifiable relief valves is maintained,
consideration will be given to acceptance on the basis of opening, internal examination, and testing
of a representative sampling of valves, including each size and type of liquefied gas or vapor relief
valve in use, provided there is logbook evidence that the remaining valves have been overhauled and
tested since crediting of the previous Class Renewal Survey.

iii. Pressure/Vacuum Relief Valves. The pressure/vacuum relief valves, rupture disc and other pressure
relief devices for interbarrier spaces and hold spaces are to be opened, examined, tested and
readjusted as necessary, depending on their design.

2.5 Fuel Handling Equipment

Fuel pumps, compressors, process pressure vessels, inert gas generators, heat exchangers and other
components used in connection with fuel handling are to be examined as required in the BKI Rules for
periodical survey of machinery.

2.6 Electrical Equipment

i. Examination of electrical equipment to include the physical condition of electrical cables and
supports, intrinsically safe, explosion proof, or increased safety features of electrical equipment.

ii. Functional testing of pressurized equipment and associated alarms.

iii. Testing of systems for de-energizing electrical equipment which is not certified for use in hazardous
areas.

iv. An electrical insulation resistance test of the circuits terminating in, or passing through, the hazardous
zones and spaces is to be carried out.

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2.7 Safety Systems

Gas detectors, temperature sensors, pressure sensors, level indicators, and other equipment providing
input to the fuel safety system are to be tested to confirm satisfactory operating condition.

i. Proper response of the fuel safety system upon fault conditions is to be verified.

ii. Pressure, temperature and level indicating equipment are to be calibrated in accordance with the
manufacturer’s requirements.

2.8 Fuel Storage Tanks

Fuel storage tanks are to be examined in accordance with an approved survey plan. For liquefied gas fuel
storage tanks the following requirements applies:

1) In developing the inspection/survey plan, the requirements for the survey of liquefied gas fuel
containment systems are to be in accordance with the requirements of Section 4-II, A.4.7.2 except as
noted below:

A) The tank insulation and tank support arrangements should be visually examined.
Non-destructive testing may be required if conditions raise doubt to the structural integrity.
B) Vacuum insulated independent fuel storage tanks of type C need not be examined internally.
Where fitted, the vacuum monitoring system should be examined and records should be
reviewed.

2) For vessels which need not comply with the International Code of Safety for Ships Using Gases
or Other Low-Flashpoint Fuels (IGF Code), MSC Res.391(95), as amended, even though an
inspection/survey plan is not required, the survey for liquefied gas fuel containment systems should
be in accordance with paragraph i.

3. Annual Survey
3.1 General
The following is to be carried out during the survey of the Fuel Storage, Fuel Bunkering System, and Fuel
Supply System:

3.1.1 Logbooks/Records
The logbooks and operating records are to be examined with regard to correct functioning of the gas
detection systems, fuel supply/gas systems, etc. The hours per day of the reliquefaction plant, gas
combustion unit, as applicable, the boil-off rate, and nitrogen consumption (for membrane containment
systems) are to be considered together with gas detection records.

3.1.2 Operating and Maintenance Instruction Manuals

The manufacturer/builder instructions and manuals covering the operations, safety and maintenance
requirements and occupational health hazards relevant to fuel storage, fuel bunkering, and fuel supply
and associated systems for the use of the fuel, are to be confirmed as being aboard the vessel.

3.1.3 Control, Monitoring and Safety Systems

1) Gas detection and other leakage detection equipment in compartments containing fuel storage, fuel
bunkering, and fuel supply equipment or components or associated systems, including indicators
and alarms, is to be confirmed in satisfactory operating condition. Recalibration of the gas detection
systems should be verified in accordance with the manufacturers’ recommendations.

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2) Verification of the satisfactory operation of the control, monitoring and automatic shutdown systems
as far as practicable of the fuel supply and bunkering systems.

3) Operational test, as far as practicable, of the shutdown of ESD protected machinery spaces.

3.1.4 Fuel Handling Piping, Machinery and Equipment

Piping, hoses, emergency shut-down valves, remote operating valves, relief valves, machinery and
equipment for fuel storage, fuel bunkering, and fuel supply such as venting, compressing, refrigerating,
liquefying, heating, cooling or otherwise handling the fuel is to be examined, as far as practicable. Means
for inerting is to be examined. Stopping of pumps and compressors upon emergency shut-down of the
system is to be confirmed as far as practicable.

3.1.5 Ventilating System

Examination of the ventilation system, including portable ventilating equipment where fitted, is to be made
for spaces containing fuel storage, fuel bunkering, and fuel supply units or components or associated
systems, including air locks, pump rooms, compressor rooms, fuel preparation rooms, fuel valve rooms,
control rooms and spaces containing gas burning equipment. Where alarms, such as differential pressure
and loss of pressure alarms, are fitted, these should be operationally tested as far as practicable.

3.1.6 Drip Trays

Portable and fixed drip trays and insulation for the protection of the ship’s structure in the event of leakage
are to be examined.

3.1.7 Hazardous Areas

Electrical equipment and bulkhead/deck penetrations including access openings in hazardous areas are to
be examined for continued suitability for their intended service and installation area.

3.1.8 Electrical Bonding

Electrical bonding arrangements in hazardous areas, including bonding straps where fitted, are to be
examined.

3.2 Fuel Storage, Bunkering and Supply Systems

The following are to be examined, so far as applicable. Insulation need not be removed, but any
deterioration or evidence of dampness is to be investigated:

3.2.1 Fuel Storage

1) External examination of the storage tanks including secondary barrier if fitted and accessible.

2) General examination of the fuel storage hold place.

3) Internal examination of tank connection space.

4) External examination of tank and relief valves.

5) Verification of satisfactory operation of tank monitoring system.

6) Examination and testing of installed bilge alarms and means of drainage of the compartment.

7) Testing of the remote and local closing of the installed main tank valve.

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3.2.2 Fuel Bunkering System

1) Examination of bunkering stations and the fuel bunkering system.

2) Verification of satisfactory operation of the fuel bunkering control, monitoring and shutdown
systems.

3.2.3 Fuel Supply System

Examination of the fuel supply system during working condition as far as practicable.

1) Verification of satisfactory operation of the fuel supply system control, monitoring and shut-down
systems.

2) Testing of the remote and local closing of the master fuel valve for each engine compartment.

4. Intermediate Survey
4.1 General
In addition to the applicable requirements of the Annual Survey, the Intermediate Survey is also to include:

4.1.1 Safety Systems

Gas detectors, temperature sensors, pressure sensors, level indicators, and other equipment providing
input to the fuel safety system are to be randomly tested to confirm satisfactory operating condition. Proper
response of the fuel safety system upon fault conditions is to be verified.

D. Thickness Measurement
1. Procedural Requirements
1.1 Thickness Measurements required in the context of hull structural classification surveys, if not carried
out by BKI itself shall be witnessed by a surveyor. The attendance of the surveyor shall be recorded.
1.2 This requires the surveyor to be on board, while the gaugings are taken, to the extent necessary to
control the process. It is confirmed that this also applies to thickness measurements taken during voyages.
1.3 Survey meeting
Prior to commencement of the Intermediate or Class Renewal Survey, a meeting is to be held between
the attending surveyor(s), the master of the ship or an appropriately qualified representative appointed
by the master or Company, the owner’s representative(s) in attendance and the thickness measurement
firm’s representative(s) so as to ensure the safe and efficient execution of the surveys and thickness
measurements to be carried out onboard.
Communication with the thickness measurement operator(s) and owner’s representative(s) is to be agreed
during the meeting, with respect to the following:

1) reporting of thickness measurements on regular basis to the attending surveyor

2) prompt notification to the surveyor in case of findings:

A) excessive and/or extensive corrosion or pitting/grooving of any significance

B) structural defects like buckling, fractures and deformed structures
C) detached and/or holed structure
D) corrosion of welds.

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When thickness measurements are taken in association with Intermediate or Class Renewal Survey, a
documented record indicating where and when the meeting took place and who attended (the name of the
surveyor(s), the master of the ship or an appropriately qualified representative appointed by the master or
Company, the owner’s representative(s) and the representative(s) of the thickness measurement firm(s)) is
to be maintained.
1.4 Thickness measurements and close-up surveys
1.4.1 In any kind of survey, i.e. special, intermediate, annual or other surveys having the scope of the
foregoing ones, thickness measurements of structures in areas where close-up surveys are required, shall
be carried out simultaneously with close-up surveys.
1.4.2 Consideration may be given by the attending Surveyor to allow use of Remote Inspection Techniques
(RIT) as an alternative to close-up survey. Surveys conducted using a RIT are to be completed to the
satisfaction of the attending Surveyor. When RIT is used for a close-up survey, temporary means of access
for the corresponding thickness measurements is to be provided unless such RIT is also able to carry out
the required thickness measurements.
Note:
Use of RIT as an alternative to close-up survey is not allowed for ships assigned with the service notation
Bulk Carrier (ESP) or Bulk Carrier (ESP), BC-A or Bulk Carrier (ESP) BC-B or Bulk Carrier (ESP) BC-C or
Self-Unloading Bulk Carrier (ESP) or Ore Carrier (ESP) or Combination Carrier/OBO (ESP) or Oil Tanker
(ESP).
1.4.3 For structure built with a material other than steel, alternative thickness measurement
requirements may be developed and applied as deemed necessary by BKI
1.4.4 Thickness measurement is normally to be carried out by means of ultrasonic test equipment. The
accuracy of the equipment is to be proven to the Surveyor as required in A.7. BKI provides guidance
for thickness measurements using ultrasonic test equipment in Petunjuk Pelaksanaan Standar Pengukuran
Ketebalan Konstruksi Lambung (Pt.1, Vol.X) which can be used by operators, shipyards and service suppliers.
The thickness measurements are to be carried out by a firm authorized by BKI

2. Thickness measurements and corrosion tolerances

2.1 Validity of an approval granted will depend on the continued qualification. The approval will have to
be renewed after a period not exceeding 3 years.
2.2 Monitoring of the thickness measurement process onboard
2.2.1 The surveyor is to decide final extent and location of thickness measurements after overall survey
of representative spaces onboard.
2.2.2 In case the owner prefers to commence the thickness measurements prior to the overall survey
then the surveyor shall advise that the planned extent and locations of thickness measurements are subject
to confirmation during the overall survey. Based on findings, the surveyor may require that additional
thickness measurements have to be taken.
2.2.3 The surveyor should direct the gauging operation by selecting locations such that readings taken
represent, on average, the condition of the structure for that area.
2.2.4 Thickness measurements taken mainly to evaluate the extent of corrosion, which may affect the
hull girder strength, should be carried out in a systematic manner of all longitudinal structural members
that are required to be gauged.
During the performance of survey meeting as required in 1.3, BKI will provide information of the required
thickness of hull structures, indicating the plate and/or web thickness as stipulated in the Construction
Rules. The surveyor is to ensure that this information is available to the owner and/or master of ship in
advance prior to the commencement of thickness measurement process.

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2.2.5 Where thickness measurements indicate substantial corrosion or wastage in excess of allowable
diminution, the surveyor should direct locations for additional thickness measurements in order to
delineate areas of substantial corrosion and to identify structural members for repairs/renewals.
Thickness measurements of structures in areas where close-up surveys are required shall be carried out
simultaneously with close-up surveys.
2.3 For detail requirements related to control of thickness measurement process onboard, see Guidance
for Marine Industry (Pt.1, Vol.AC) Sec.4 R-77
2.4 Corrosion and wear tolerances
2.4.1 The wastage allowance (diminution limits) for plates and stiffeners are shown in Annex A.3.
2.4.2 Where thickness measurements result in corrosion and wear values exceeding those stated in
Annex A.3, the respective hull structural elements will have to be renewed.
2.4.3 BKI reserves the right -where applicable- to modify the indicated values according to Annex A.3
referring to the maximum permissible large surface corrosion allowances.
Where reduced material thickness was admitted for the new building (effective system of corrosion
prevention), the permissible corrosion allowances are to be based on the unreduced rule thickness.

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Section 4 Surveys
I. Additional Requirements for Ships with ESP Notation . . . . . . . . . . . . . . . . . . . . 4-1
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
B. Oil Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
C. Double Hull Oil Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
D. Chemical Tankers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
E. Bulk Carriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35
F. Double skin Bulk Carriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50
II. Additional Requirements for Ships Not Subject to ESP Notation . . . . . . . . . . . . . . . 4-62
A. Liquefied Gas Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62
B. General Dry Cargo Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71
C. Shell Doors, Stern Doors, Inner Doors and Bow Doors of Ro-Ro Ships . . . . . . . . 4-82
D. Livestock Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-86

I. Additional Requirements for Ships with ESP Notation

A. General
1. Application
1.1 In addition to the requirements specified in Section 3, the requirements in this section apply to hull
surveys of ships subject to the Enhanced Survey Programme (ESP) such as bulk carriers, oil tankers and
chemical tankers.

2. Procedural requirements for certain ESP surveys

2.1 The objective of this requirements is to improve the quality of surveys. Taking into consideration,
the size of vessels and scope of surveys for vessels noted below, it is more effective to have more than
one surveyor examine the required spaces, holds or tanks and to provide mutual support and consultation
during the surveys in recommending repairs and actions required for conditions of Class.

1) On ships 20,000 tonnes DWT and above, subject to ESP, starting with Class Renewal Survey no. III,
all special and intermediate hull classification surveys are to be carried out by at least two exclusive
surveyors. On bulk carriers 100,000 DWT and above of single side skin construction the intermediate
hull classification survey between 10 and 15 years of age is to be performed by two exclusive
surveyors.

2) This requires that at least two exclusive surveyors attend on board at the same time to perform the
required survey. Where compatible with relevant laws and regulations, on dual class vessels, the
requirement for two surveyors may be fulfilled by having one surveyor attend from each class Society.

3) Though each attending surveyor is not required to perform all aspects of the required survey, they
are required to consult with each other and to do joint overall and close-up surveys to the extent
necessary to determine the condition of the vessel. The extent of these surveys should be sufficient
for the surveyors to agree on actions required to complete the survey with respect to renewals,
repairs, and other recommendations or conditions of class. Each surveyor is required to co-sign the
survey report or indicate their concurrence in an equivalent manner.

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4) The following surveys may be witnessed by a single Surveyor:

A) Thickness measurements in accordance with Section 3, D;

B) Tank testing in accordance with the applicable requirement in Section 4;
C) Repairs carried out in association with Intermediate and Special Hull Classification Survey, the
extent of which have been agreed upon by the required two surveyors during the course of the
surveys.

5) Surveyors used to fulfill this requirement are to be qualified in the survey processes involved.

6) The onboard attendance of the surveyors is to be documented according to the BKI’s procedures

3. Documents to be carried on board

3.1 The owner is to obtain, supply and maintain on board documentation as specified under 3.2 and 3.3
which is to be readily available for the Surveyor. The documentation is to be kept on board for the life time
of the ship.
3.2 Survey Report File

1) A Survey Report File is to be part of the documentation on board:

A) Reports on structural surveys

B) Executive Hull Summary
C) Thickness measurements reports

2) The Survey Report File is to be available also in the Owners management office and BKI offices.

3.3 Supporting documents

1) Main structural plan of cargo and ballast tanks

2) Previous damage and repair history

3) Cargo and ballast history

4) Extent of use of inert gas plant and tank cleaning procedures

5) Owner Inspection report with reference to:

A) Structural deterioration in general

B) Leakage in bulkheads and piping
C) Condition of protective coating or corrosion prevention

6) Survey programme as required under A.8 until such time as the Class Renewal Survey or intermediate
survey, as applicable, has been completed

7) Any other information that will help to identify critical structural areas and/or suspect areas requiring
inspection

8) The updating of the ship construction file (SCF) subject to SOLAS Chapter II-1 part A-1 regulation 3-10
(for ship constructed under CSR rules (Rules for Bulk Carrier and Oil Tanker (Pt.1, Vol.XVII))

3.4 Review of Documentation on Board

Prior to survey, the Surveyor is to examine the completeness of the documentation onboard, and its
contents as a basis for the survey.

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4. Procedures for Thickness Measurements

4.1 General
4.1.1 The required thickness measurements, if not carried out by BKI itself, are to be witnessed by a BKI
Surveyor. The Surveyor is to be on board to the extent necessary to control the process.
4.1.2 The thickness measurement firm is to be part of the survey planning meeting to be held prior to
commencing the survey.
4.1.3 Thickness measurements of structures in areas where close-up surveys are required shall be carried
out simultaneously with close-up surveys. See Section 3, D.1.4
4.1.4 In all cases the extent of the thickness measurements is to be sufficient as to represent the actual
average condition.

4.2 Certification of Thickness Measurement Firm

4.2.1 The thickness measurements are to be carried out by a qualified firm certified by BKI. See Section
3, A.5.3.1.

4.3 Reporting
4.3.1 A thickness measurement report is to be prepared. The report is to give the location of
measurements, the thickness measured as well as corresponding original thickness. Furthermore, the
report is to give the date when the measurements were carried out, type of measurement equipment,
names of personnel and their qualifications and has to be signed by the operator.
4.3.2 The Surveyor is to review the final thickness measurement report and countersign the cover page.

5. Access to Structures
5.1 For overall survey, means are to be provided to enable the surveyor to examine the hull structure in
a safe and practical way.
5.2 For Close-Up Surveys in cargo and ballast tanks, one or more of the following means for access,
acceptable to the Surveyor, is to be provided:

1) permanent or temporary staging

2) passages through structures

3) hydraulic arm vehicles such as conventional cherry pickers, lifts and moveable platforms

4) boats or rafts

5) portable ladders

6) other equivalent means

5.3 For close-up surveys of the cargo hold shell frames of bulk carriers less than 100,000 DWT, one or
more of the following means for access, acceptable to the Surveyor, is to be provided:

1) permanent staging and passages through structures;

2) temporary staging and passages through structures;

3) portable ladder restricted to not more than 5 m in length may be accepted for surveys of lower section
of a shell frame including bracket;

4) hydraulic arm vehicles such as conventional cherry pickers, lifts and movable platforms;

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5) boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads at all
levels of water;

6) other equivalent means.

5.4 For close-up surveys of the cargo hold shell frames of bulk carriers 100,000 DWT and above, the use
of portable ladders is not accepted, and one or more of the following means for access, acceptable to the
surveyor, is to be provided:

1) Annual Surveys, Intermediate Survey under 10 years of age and Class Renewal Survey No. I

— permanent staging and passages through structures;

— temporary staging and passages through structures;
— hydraulic arm vehicles such as conventional cherry pickers, lifts and movable
— platforms;
— boats or rafts provided the structural capacity of the hold is sufficient to withstand
— static loads at all levels of water;
— other equivalent means.

2) Subsequent Intermediate Surveys and Class Renewal Surveys:

— Either permanent or temporary staging and passage through structures for close-up survey of
at least the upper part of hold frames;
— Hydraulic arm vehicles such as conventional cherry pickers for surveys of lower and middle part
of shell frames as alternative to staging;
— lifts and movable platforms;
— boats or rafts provided the structural capacity of the hold is sufficient to withstand static loads
at all levels of water;
— other equivalent means.

5.5 Notwithstanding the above requirements:

— the use of a portable ladder fitted with a mechanical device to secure the upper end of the ladder is
acceptable for the ”close-up examination of sufficient extent, minimum 25% of frames, to establish
the condition of the lower region of the shell frames including approx. lower one third length of side
frame at side shell and side frame end attachment and the adjacent shell plating of the forward cargo
hold” at Annual Survey.

— The use of hydraulic arm vehicles or aerial lifts (“Cherry picker”) may be accepted by the attending
surveyor for the close-up survey of the upper part of side shell frames or other structures in all cases
where the maximum working height is not more than 17 m.

5.6 For Surveys conducted by use of a remote inspection technique, one or more of the following means
for access, acceptable to the Surveyor, is to be provided:

— Unmanned robot arm.

— Remote Operated Vehicles (ROV).

— Unmanned Aerial Vehicles / Drones.

— Other means acceptable to BKI.

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6. Survey at Sea or at Anchorage

6.1 Survey at sea or at anchorage may be accepted provided the Surveyor is given the necessary assistance
from the personnel onboard. Necessary precautions and procedures for carrying out the survey are to be
in accordance with this section.
6.2 A communication system is to be arranged between the survey party in the tank and the responsible
officer on deck. This system is also to include the personnel in charge of Ballast pump handling if boats or
rafts are used.
6.3 Surveys of tanks by means of boats or rafts may only be undertaken with the agreement of the
Surveyor, who is to take into account the safety arrangements provided, including weather forecasting and
ship response under foreseeable conditions and provided the expected rise of water within the tank does
not exceed 0,25 m.
6.4 When rafts or boats will be used for close-up survey the following conditions are to be observed:

1) only rough duty, inflatable rafts or boats, having satisfactory residual buoyancy and stability even if
one chamber is ruptured, are to be used;

2) the boat or raft is to be tethered to the access ladder and an additional person is to be stationed
down the access ladder with a clear view of the boat or raft;

3) appropriate lifejackets are to be available for all participants;

4) the surface of water in the tank is to be calm (under all foreseeable conditions the expected rise of
water within the tank is to not exceed 0,25 m) and the water level stationary. On no account is the
level of the water to be rising while the boat or raft is in use;

5) the tank or space must contain clean ballast water only. Even a thin sheen of oil on the water is not
acceptable;

6) at no time is the water level to be allowed to be within 1 m of the deepest under deck web face flat
so that the survey team is not isolated from a direct escape route to the tank hatch. Filling to levels
above the deck transverses is only to be contemplated if a deck access manhole is fitted and open in
the bay being examined, so that an escape route for the survey party is available at all times. Other
effective means of escape to the deck may be considered;

7) if the tanks (or spaces) are connected by a common venting system, or Inert Gas system, the tank in
which the boat or raft is to be used is to be isolated to prevent a transfer of gas from other tanks (or
spaces)1) .

6.5 Rafts or boats alone may be allowed for inspection of the under-deck areas for tanks or spaces, if the
depth of the webs is 1,5 m or less.
6.6 If the depth of the webs is more than 1,5 m, rafts or boats alone may be allowed only:

1) when the coating of the under-deck structure is in GOOD condition and there is no evidence of
wastage; or

2) if a permanent means of access is provided in each bay to allow safe entry and exit.

This means:

A) access direct from the deck via a vertical ladder and a small platform fitted approximately 2 m
below the deck in each bay; or
1)
Only applicable for Sub-section B, C and D of this Intermediate Section.

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B) access to deck from a longitudinal permanent platform having ladders to deck in each end of
the tank. The platform shall, for the full length of the tank, be arranged in level with, or above,
the maximum water level needed for rafting of under deck structure. For this purpose, the
ullage corresponding to the maximum water level is to be assumed not more than 3 m from the
deck plate measured at the mid span of deck transverses and in the middle length of the tank
(See Fig. 4-I.1). If neither of the above conditions are met, then staging or an “other equivalent
means” is to be provided for the survey of the under-deck areas.

If neither of the above conditions are met, then staging or an “other equivalent means” is to be
provided for the survey of the under-deck areas.

Figure 4-I.1 Maximum water level in a tank

6.7 The use of rafts or boats alone in paragraphs 6.5 and 6.6 does not preclude the use of boats or rafts
to move about within a tank during a survey.
Reference is made to Guidance for Marine Industry (Pt.1, Vol.AC) Sec.2.R-39 - Guidelines for the use of
Boats or Rafts for Close-up surveys.

7. Survey Planning Meeting

7.1 Proper preparation and close co-operation between the attending surveyor(s) and the owner’s
representatives onboard prior to and during the survey are an essential part in the safe and efficient conduct
of the survey. During the survey on board safety meetings are to be held regularly.
7.2 Prior to commencement of any part of the renewal and intermediate survey, a survey planning
meeting is to be held between the attending surveyor(s), the owner’s representative in attendance, the
thickness measurement firm operator (as applicable) and the master of the ship or an appropriately
qualified representative appointed by the master or Company for the purpose to ascertain that all the
arrangements envisaged in the survey programme are in place, so as to ensure the safe and efficient conduct
of the survey work to be carried out.
7.3 The following is an indicative list of items that are to be addressed in the meeting:

1) schedule of the vessel (i.e. the voyage, docking and undocking manoeuvres, periods alongside, cargo
and ballast operations, etc.);

2) provisions and arrangements for thickness measurements (i.e. access, cleaning/de-scaling,

illumination, ventilation, personal safety);

3) extent of the thickness measurements;

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4) acceptance criteria (refer to the list of minimum thicknesses);

5) extent of close-up survey and thickness measurement considering the coating condition and suspect
areas/areas of substantial corrosion;

6) execution of thickness measurements;

7) taking representative readings in general and where uneven corrosion/pitting is found;

8) mapping of areas of substantial corrosion;

9) communication between attending surveyor(s), the thickness measurement firm operator(s) and
owner representative(s) concerning findings.

8. Survey programme

The Owner in cooperation with BKI’s surveyor is to work out a specific Survey Programme prior to the
commencement of any part of:

1) the Class Renewal Survey

2) the Intermediate Survey for oil tanker over 10 years of age

The Survey Programme is to be in a written format based on the information in Annex B.2.
The survey is not to commence until the survey programme has been agreed. The Survey Programme
at Intermediate Survey may consist of the Survey Programme at the previous Class Renewal Survey
supplemented by the Executive Hull Summary of that Class Renewal Survey and later relevant survey
reports.
8.1 Prior to the development of the survey programme, the survey planning questionnaire is to be
completed by the owner based on the information set out in Annex B.3 and forwarded to BKI.
The Survey Programme is to be worked out taking into account any amendments to the survey requirements
implemented after the last Class Renewal Survey carried out.
8.2 In developing the survey programme, the following documentation is to be collected and consulted
with a view to selecting tanks, areas, and structural elements to be examined:
8.2.1 For Bulk Carriers and Double Skin Bulk Carriers:

1) survey status and basic ship information;

2) documentation on board, as described in 3.2 and 3.3;

3) main structural plans of cargo and ballast tanks (scantlings drawings), including information regarding
use of high-tensile steels (HTS);

4) relevant previous damage and repair history;

5) Information regarding the use of the ship’s holds and tanks, typical cargoes and other relevant data;

6) Information regarding corrosion prevention level on the new building; and

7) Information regarding the relevant maintenance level during operation.

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8.2.2 For Oil Tankers, Chemical Tankers and Double Hull Oil Tankers:
1) survey status and basic ship information;
2) documentation on board, as described in 3.2 and 3.3;
3) main structural plans of cargo and ballast tanks (scantlings drawings), including information regarding
use of high-tensile steels (HTS);
4) Executive Hull Summary;
5) relevant previous damage and repair history;
6) relevant previous survey and inspection reports from both the recognized organization and the
owner;
7) cargo and ballast history for the last 3 years, including carriage of cargo under heated conditions;
8) details of the inert gas plant and tank cleaning procedures;
9) information and other relevant data regarding conversion or modification of the ship’s cargo and
ballast tanks since the time of construction;
10) description and history of the coating and corrosion protection system (including previous class
notations), if any;
11) inspections by the Owner’s personnel during the last 3 years with reference to structural deterioration
in general, leakages in tank boundaries and piping and condition of the coating and corrosion
protection system if any. Guidance for reporting is shown in Annex B.1.
12) information regarding the relevant maintenance level during operation including port state
control reports of inspection containing hull related deficiencies, Safety Management System
non-conformities relating to hull maintenance, including the associated corrective action(s); and
13) any other information that will help identify suspect areas and critical structural areas
8.3 The submitted survey programme is to account for and comply, as a minimum, with the requirements
of Section 4-I for close-up survey, thickness measurement and tank testing, respectively, and is to include
relevant information including at least:
8.3.1 For Bulk Carriers and Double Skin Bulk Carriers:
1) basic ship information and particulars;
2) main structural plans of cargo and ballast tanks (scantling drawings), including information regarding
use of high tensile steels (HTS);
3) plan of tanks and holds;
4) list of tanks and holds with information on use, protection and condition of coating;
5) conditions for survey (e.g., information regarding tank cleaning, gas freeing, ventilation, lighting, etc.);
6) provisions and methods for access to structures;
7) equipment for surveys;
8) Nomination of hold and tanks and areas for Close-up Survey;
9) Nominations of sections and areas for thickness measurement;
10) Nomination of tanks for tank pressure testing;
11) Damage experience related to the ship in question.

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8.3.2 For Oil Tankers, Chemical Tankers and Double Hull Oil Tankers:

1) basic ship information and particulars;

2) main structural plans of cargo and ballast tanks (scantling drawings), including information regarding
use of high tensile steels (HTS);

3) arrangement of tanks;

4) list of tanks with information on their use, extent of coatings and corrosion protection systems;

5) conditions for survey (e.g., information regarding tank cleaning, gas freeing, ventilation, lighting, etc.);

6) provisions and methods for access to structures;

7) equipment for surveys;

8) identification of tanks and areas for close-up survey;

9) identification of areas and sections for thickness measurement;

10) identification of tanks for tank testing;

11) identification of the thickness measurement firm;

12) damage experience related to the ship in question; and

13) critical structural areas and suspect areas, where relevant.

8.4 BKI will advise the Owner of the maximum acceptable structural corrosion diminution levels applicable
to the vessel.
8.5 Use may also be made of Technical Assessment in Conjunction with the Planning of Enhanced Surveys
for Renewal Survey Hull, contained in Annex B.4. These guidelines are a recommended tool which may
be invoked at the discretion of BKI, when considered necessary and appropriate, in conjunction with the
preparation of the required Survey Programme.

9. Rescue and emergency response equipment

If breathing apparatus and/or other equipment is used as ’Rescue and emergency response equipment’
then it is recommended that the equipment should be suitable for the configuration of the space being
surveyed.

10. Conditions of Survey

10.1 The Owner is to provide the necessary facilities for a safe execution of the survey.
10.2 In order to enable the attending surveyors to carry out the survey, provisions for proper and safe
access are to be agreed between the owner and BKI and are to be in accordance with Annex A.1 (IACS PR
37, Procedural for Confined Space Safe Entry).
10.3 Details of the means of access are to be provided in the survey planning questionnaire.
10.4 In cases where the provisions of safety and required access are judged by the attending surveyors
not to be adequate, the survey of the spaces involved is not to proceed.
10.5 Cargo holds, tanks and spaces are to be safe for access. Cargo holds, tanks and spaces are to be gas
free and properly ventilated. Prior to entering a tank, void or enclosed space, it is to be verified that the
atmosphere in that space is free from hazardous gas and contains sufficient oxygen.

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10.6 In preparation for survey and thickness measurements and to allow for a thorough examination, all
spaces are to be cleaned including removal from surfaces of all loose accumulated corrosion scale. Spaces
are to be sufficiently clean and free from water, scale, dirt, oil residues etc. to reveal corrosion, deformation,
fractures, damages, or other structural deterioration as well as the condition of the coating. However,
those areas of structure whose renewal has already been decided by the owner need only be cleaned and
descaled to the extent necessary to determine the limits of the areas to be renewed.
10.7 Sufficient illumination is to be provided to reveal corrosion, deformation, fractures, damages or other
structural deterioration.
10.8 Where Soft or Semi-Hard Coatings have been applied, safe access is to be provided for the surveyor to
verify the effectiveness of the coating and to carry out an assessment of the conditions of internal structures
which may include spot removal of the coating. When safe access cannot be provided, the soft or semi-hard
coating is to be removed.

11. Equipment for Survey

11.1 Thickness measurement is normally to be carried out by means of ultrasonic test equipment. The
accuracy of the equipment is to be proven to the Surveyor as required.
11.2 One or more of the following fracture detection procedures may be required if deemed necessary
by the Surveyor:

— radiographic equipment

— ultrasonic equipment

— magnetic particle equipment

— dye penetrant.

11.3 Explosimeter, oxygen-meter, breathing apparatus, lifelines, riding belts with rope and hook and
whistles together with instructions and guidance on their use are to be made available during the survey.
A safety check-list is to be provided.
11.4 Adequate and safe lighting is to be provided for the safe and efficient conduct of the survey.
11.5 Adequate protective clothing is to be made available and used (e.g. safety helmet, gloves, safety
shoes, etc.) during the survey.

12. Reporting and Evaluation of Survey

12.1 Evaluation of Survey Report
.1 The data and information on the structural condition of the vessel collected during the survey is to be
evaluated for acceptability and continued structural integrity of the vessel.
.2 In case of oil tankers of 130 m in length and upwards (as defined in the International Convention on
Load Lines in force), the ship’s longitudinal strength is to be evaluated by using the thickness of structural
members measured, renewed and reinforced, as appropriate, during the Class Renewal Survey carried out
after the ship reached 10 years of age in accordance with the criteria for longitudinal strength of the ship’s
hull girder for oil tankers in Annex B.10. However, the only thickness measurement records which have
been measured within one (1) year period from the date of the longitudinal strength evaluation shall be
considered valid.
.3 For CSR bulk carriers (including Double Skin Bulk Carriers), the ship’s longitudinal strength is to be
evaluated by using the thickness of structural members measured, renewed and reinforced, as appropriate,
during the Class Renewal Surveys carried out after the ship reached 15 years of age (or during the Class
Renewal Survey no. III, if this is carried out before the ship reaches 15 years) in accordance with the criteria
for longitudinal strength of the ship’s hull girder for Rules for CSR bulk carriers specified in Rules for Bulk

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Carriers and Oil Tankers (Pt.1, Vol.XVII.B) Pt.1, Ch. 13. However, the only thickness measurement records
which have been measured within one (1) year period from the date of the longitudinal strength evaluation
shall be considered valid.
.4 The final result of evaluation of the ship’s longitudinal strength required in 12.1.2 above, after renewal
or reinforcement work of structural members, if carried out as a result of initial evaluation, is to be reported
as a part of the Executive Hull Summary.

12.2 Reporting
.1 Principles for survey reporting are shown in Annex B.12.
.2 When a survey is split between different survey stations, a report is to be made for each portion
of the survey. A list of items examined and / or tested (pressure testing, thickness measurements etc.)
and an indication of whether the item has been credited, are to be made available to the next attending
Surveyor(s), prior to continuing or completing the survey.
.3 An Executive Hull Summary of the survey and results is to be issued to the Owner as shown in Annex
B.12 and placed on board the vessel for reference at future surveys. The Executive Hull Summary is to be
endorsed by BKI’s surveyor.

B. Oil Tankers
1. General Requirements
1.1 Application
1.1.1 The following section apply to oil tankers and product carriers more than 500 GT as defined by the
Rules for Hull (Pt.1, Vol.II) Sec.24, also to ships intended for the alternative carriage of dry cargo or oil, and
to other than double hull oil tankers.
1.1.2 The following requirements apply to surveys of hull structure and piping systems in way of cargo
tanks, pump rooms, cofferdams, pipe tunnels, void spaces within the cargo area, and for all ballast tanks
on ships with the Qualifier Notation ESP additionally to the arrangements in Section 3.
1.1.3 Unless otherwise stated in the following, the arrangements in Section 3 apply.
1.1.4 Definitions of any terms used in this section are in accordance with Annex A.7.

1.2 Extent of surveys

1.2.1 The surveys are to cover all installations, outfit and equipment related to the carriage and handling
of oil cargo. They also cover the surveys required by the SOLAS 74 regulations for oil tankers. The protective
equipment and the safety equipment required by the SOLAS 74 regulations2) for protection of the personnel
as well as other equipment and outfit, which are no Class Requirement items, are not covered by the present
Rules for Classification and Surveys. These items will, however, be included in the surveys, if compliance
with the requirements of an Administration has to be certified.
1.2.2 The following requirements under 2. to 4. defines the minimum extent of examinations. The
surveys are to be extended where substantial corrosion and/or structural defects are found and will include
an additional Close Up Survey (close visual inspection range, preferably within reach of hand) where
deemed necessary by the Surveyor. The surveys are to be extended where substantial corrosion and/or
structural defects are found and will include an additional Close Up Survey (close visual inspection range,
preferably within reach of hand) where deemed necessary by the Surveyor.
2)
”International Convention for the Safety of Life at Sea” (1974) and Amendments

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2. Annual Surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull and piping are maintained in a satisfactory condition and should take into account the service history,
condition and extent of the corrosion prevention system of ballast tanks and areas identified in the survey
report file.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.

— Examination of watertight penetrations as far as practicable.

2.3 Examination of weather deck

— Examination of cargo tank openings including gaskets, covers, coamings and flame screens.

— Examination of cargo tanks pressure/vacuum valves and flame screens.

— Examination of flame screens on vents to all bunker tanks.

— Examination of cargo, crude oil washing, bunker and vent piping systems, including vent masts and
headers.

2.4 Examination of Cargo Pump Rooms and Pipe Tunnels, if fitted

— Examination of all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of pump room bulkheads.

— Examination of the condition of all piping systems.

2.5 Examination of Ballast tanks

2.5.1 Examination of Ballast Tanks where required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out.
2.5.2 When considered necessary by the Surveyor, or when extensive corrosion exists, thickness
measurements are to be carried out and if the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance with
Annex B.5.
These extended thickness measurements are to be carried out before the survey is credited as completed.
2.5.3 Suspect Areas identified at previous surveys are to be examined. Areas of substantial corrosion
identified at previous surveys are to have thickness measurements taken.

3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.
3.1.2 For weather decks, an examination as far as applicable of cargo, crude oil washing, bunker, ballast,
steam and vent piping systems as well as vent masts and headers is to be carried out.

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3.1.3 If upon examination there is any doubt as to the condition of the piping, the piping may be required
to be pressure tested, thickness measured, or both.

3.2 Oil Tankers 5 – 10 years of age, the following is to apply:

3.2.1 All Ballast Tanks are to be examined. When considered necessary by the surveyor, thickness
measurement and testing are to be carried out to ensure that the structural integrity remains effective.
3.2.2 Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than GOOD condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

3.2.3 In addition to the requirements above, suspect areas identified at previous surveys are to be
examined.

3.3 Oil Tankers 10 – 15 years of age, the following is to apply:

3.3.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.
3.3.2 In application of 3.3.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.3.3 In application of 3.3.1 above, an underwater survey may be considered in lieu of the requirements
of B.4.2.

3.4 Oil Tankers over 15 years of age, the following is to apply:

3.4.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.
3.4.2 In application of 3.4.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.4.3 In application of 3.4.1 above, a survey in dry dock is to be part of the intermediate survey. The
overall and close-up surveys and thickness measurements, as applicable, of the lower portions of the cargo
tanks and water ballast tanks are to be carried out in accordance with the applicable requirements for
intermediate surveys, if not already performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

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4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 All cargo tanks, Ballast Tanks, including double bottom tanks, pump rooms, pipe tunnels, cofferdams
and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this examination is to be
supplemented by thickness measurement and testing required in 4.5 and 4.6, to ensure that the structural
integrity remains effective. The aim of the examination is to discover Substantial Corrosion, significant
deformation, fractures, damages or other structural deterioration, that may be present.
4.1.4 Cargo piping on deck, including Crude Oil Washing (COW) piping, Cargo and Ballast piping within
the above tanks and spaces are to be examined and operationally tested to working pressure to attending
Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory. Special attention is to be
given to any ballast piping in cargo tanks and cargo piping in ballast tanks and void spaces, and Surveyors are
to be advised on all occasions when this piping, including valves and fittings are open during repair periods
and can be examined internally.

4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo tanks and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

4.3 Tank Protection

4.3.1 Where provided, the condition of the corrosion prevention system of cargo tanks is to be examined.
4.3.2 A Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than ”GOOD” condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

4.3.3 Thickness measurements are to be carried out as deemed necessary by the surveyor.

4.4 Extent of Overall and Close-up Survey

4.4.1 An Overall Survey of all tanks and spaces is to be carried out at each Class Renewal Survey.
4.4.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-I.1.

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4.4.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the tanks under survey, the condition of the corrosion prevention system and also in the
following cases:
1) In particular, tanks having structural arrangements or details which have suffered defects in similar
tanks or on similar ships according to available information.
2) In tanks which have structures approved with reduced scantlings due to an approved corrosion
control system.
4.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-I.1 may be specially considered.

4.5 Extent of Thickness Measurement

4.5.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-I.2.
4.5.2 Provisions for extended measurements for areas with Substantial Corrosion are given in Annex B.5,
and as may be additionally specified in the Survey Programme as required by A.8. These extended thickness
measurements are to be carried out before the survey is credited as completed. Suspect Areas identified
at previous surveys are to be examined. Areas of substantial corrosion identified at previous surveys are to
have thickness measurements taken.
4.5.3 The Surveyor may further extend the thickness measurements as deemed necessary.
4.5.4 For areas in tanks where hard protective coating is found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-I.2 may be specially considered.
4.5.5 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements.
4.5.6 In cases where two or three sections are to be measured, at least one is to include a Ballast Tank
within 0,5L amidships.

4.6 Extent of Tank testing

4.6.1 The minimum requirements for ballast tank testing are given in 4.6.3 and Table 4-I.3, whereas, for
cargo tank testing are given in 4.6.4 and Table 4-I.3. The Surveyor may require tank testing to be extended
as deemed necessary.
4.6.2 Cargo tank testing carried out by the vessel’s crew under the direction of the Master may be
accepted by the surveyor provided the following conditions are complied with:
1) a tank testing procedure has been submitted by the owner and reviewed by BKI prior to the testing
being carried out;
2) the tank testing is carried out prior to overall survey or close-up survey;
3) the tank testing is carried out within Class Renewal Survey window and not more than 3 months prior
to the date on which the overall or close up survey is completed;
4) the tank testing has been satisfactorily carried out and there is no record of leakage, distortion or
substantial corrosion that would affect the structural integrity of the tank;
5) the satisfactory results of the testing is recorded in the vessel’s logbook;and
6) the internal and external condition of the tanks and associated structure are found satisfactory by
the surveyor at the time of the overall and close up survey.
4.6.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
4.6.4 Boundaries of cargo tanks are to be tested to the highest point that liquid will rise under service
conditions.

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Table 4-I.1 Minimum Requirements for Close-Up Surveys of Oil Tankers

Class Renewal Survey Class Renewal Survey Class Renewal Survey Class Renewal Survey
No. I No. II No. III No. IV and Subsequent
age ≤5 5 < age ≤10 10 < age ≤15 age > 15
ONE WEB FRAME ALL WEB FRAME
RING RINGS
ALL WEB As Class Renewal
in a ballast wing tank, in a ballast wing tank,
(1) (1) (1) FRAME RINGS Survey
if any, or a cargo wing if any, or a cargo wing
in all ballast tanks No. III
tank used primarily for tank used primarily for
water ballast water ballast

ONE DECK
ONE DECK ALL WEB Additional transverses
TRANSVERSE
(2) TRANSVERSE (2) (1) FRAME RINGS included as deemed
in each of the remaining
in a cargo oil tank in a cargo wing tank necessary by BKI
ballast tanks, if any

A minimum of 30%
ONE TRANSVERSE ONE DECK of all web frame rings
(4) BULKHEAD (2) TRANSVERSE (1) in each remaining
in a ballast tank in a cargo wing tank cargo wing
tank (see Note1)

ONE DECK ALL TRANSVERSE

ONE TRANSVERSE
TRANSVERSE BULKHEADS
(4) BULKHEAD (2) (3)
in two cargo centre in all cargo and ballast
in a cargo oil wing tank
tanks tanks

BOTH TRANSVERSE A minimum of 30% of

BULKHEADS deck and bottom
ONE TRANSVERSE
in a ballast wing tank, if transverses including
(4) BULKHEAD (3) (5)
any, or a cargo wing adjacent structural
in a cargo oil centre tank
tank used primarily for members in each cargo
water ballast centre tank

ONE TRANSVERSE
BULKHEAD As considered necessary
(4) (6)
in each remaining by the surveyor
ballast tank

ONE TRANSVERSE
(4) BULKHEAD
in a cargo oil wing tank

ONE TRANSVERSE
(4) BULKHEAD
in two cargo centre tanks

(1) Complete transverse web frame ring including adjacent structural members
(2) Deck transverse including adjacent deck structural members
(3) Transverse bulkhead complete – including girder system and adjacent structural members
(4) Transverse bulkhead lower part – including girder system and adjacent structural members
(5) Deck and bottom transverse including adjacent structural members
(6) Additional complete transverse web frame ring
Note 1: The 30% is to be rounded up to the next whole integer.

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Table 4-I.2 Minimum Requirements for Thickness Measurements of Single Hull Oil Tankers

Class Renewal Survey Class Renewal Survey Class Renewal Survey

Class Renewal Survey No. I
No. II No. III No. IVand Subsequent
age ≤ 5
5 < age ≤ 10 10 < age ≤ 15 age > 15
One section of deck plating
Within the cargo area:
for the full beam of the ship
Within the cargo area: Within the cargo area: - each deck plate
within the cargo area (in way
- each deck plate - each deck plate - three transverse
of ballast tank, if any, or a
- one transverse section1 - two transverse sections1 sections1
cargo tank used primarily for
- each bottom plate
water ballast)
Measurements of those structural members subject to Close-Up Survey according to Table 4-I.1, for general
assessment and recording of corrosion pattern
Suspect areas
Selected wind and water strakes
All wind and water
outside the cargo area
strakes full length
All wind and water strakes
within the cargo area
1 At least one section is to include a ballast tank within 0,5L amidships.

Table 4-I.3 Minimum Requirements for Tank Testing of Single Hull Oil Tankers

Class Renewal Survey Class Renewal Survey Class Renewal Survey Class Renewal Survey
No. I No. II No. III No. IV and Subsequent
age ≤ 5 5 < age ≤ 10 10 < age ≤ 15 age > 15
All ballast tank boundaries
Cargo tank boundaries facing
ballast tanks, void spaces, pipe
All cargo tank bulkheads
tunnels, pump rooms or
cofferdams

C. Double Hull Oil Tankers

1. General Requirements
1.1 Application
1.1.1 The following instructions refer to self-propelled double hull oil tankers and product carriers more
than 500 GT as defined by the Rules for Hull (Pt.1, Vol.II) Sec. 24. Also, to ships intended for the alternative
carriage of dry cargo or oil.
1.1.2 The following requirements apply to surveys of hull structure and piping systems in way of cargo
tanks, pump rooms, cofferdams, pipe tunnels, void spaces within the cargo area, and for all ballast tanks
on ships with the Qualifier Notation ESP additionally to the arrangements in Section 3.
1.1.3 Unless otherwise stated in the following, the arrangements in Section 3 apply.
1.1.4 Definitions of any terms used in this section are in accordance with Annex A.7.
1.1.5 Additional requirements for survey, assessment and repair of hull structures, see Guidance for
Marine Industry (Pt.1, Vol.AC) Sec.5 R-96

1.2 Extent of surveys

1.2.1 The surveys are to cover all installations, outfit and equipment related to the carriage and handling
of oil cargo. They also cover the surveys required by the SOLAS 74 regulations for oil tankers. The protective
equipment and the safety equipment required by the SOLAS 74 regulations for protection of the personnel
as well as other equipment and outfit, which are no Class Requirement items, are not covered by the present

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Rules for Classification and Surveys. These items will, however, be included in the surveys, if compliance
with the requirements of an Administration has to be certified.
1.2.2 The following requirements under 2. to 4. defines the minimum extent of examinations. The
surveys are to be extended where substantial corrosion and/or structural defects are found, and will
include an additional Close Up Survey (close visual inspection range, preferably within reach of hand) where
deemed necessary by the Surveyor.

2. Annual Surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull and piping are maintained in a satisfactory condition and should take into account the service history,
condition and extent of the corrosion prevention system of ballast tanks and areas identified in the survey
report file.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.

— Examination of watertight penetrations as far as practicable.

2.3 Examination of weather deck

— Examination of cargo tank openings including gaskets, covers, coamings and flame screens.

— Examination of cargo tanks pressure/vacuum valves and flame screens.

— Examination of flame screens on vents to all bunker tanks.

— Examination of cargo, crude oil washing, bunker and vent piping systems, including vent masts and
headers.

2.4 Examination of Cargo Pump Rooms and Pipe Tunnels, if fitted

— Examination of all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of pump room bulkheads.

— Examination of the condition of all piping systems.

2.5 Examination of Ballast tanks

2.5.1 Examination of Ballast Tanks where required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out.
2.5.2 When considered necessary by the Surveyor, or when extensive corrosion exists, thickness
measurements are to be carried out and if the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance with
Annex B.5.
These extended thickness measurements are to be carried out before the survey is credited as completed.
2.5.3 Suspect Areas identified at previous surveys are to be examined. Areas of substantial corrosion
identified at previous surveys are to have thickness measurements taken.
2.5.4 For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas are
required to be examined and additional thickness measurements are to be carried out.

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3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.
3.1.2 For weather decks, an examination as far as applicable of cargo, crude oil washing, bunker, ballast,
steam and vent piping systems as well as vent masts and headers is to be carried out.
3.1.3 If upon examination there is any doubt as to the condition of the piping, the piping may be required
to be pressure tested, thickness measured, or both.
3.1.4 For vessels built under Rules for Bulk Carrier and Oil Tanker (Pt.1, Vol.XVII), the identified substantial
corrosion areas are required to be examined and additional thickness measurements are to be carried out.

3.2 Double Hull Oil Tankers 5 – 10 years of age, the following is to apply:
3.2.1 For tanks used for salt-water ballast, an Overall Survey of Representative Tanks selected by the
Surveyor is to be carried out.
If such inspections reveal no visible structural defects, the examination may be limited to a verification that
the hard-protective coating remains in “GOOD” condition.
3.2.2 Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than “GOOD” condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

3.2.3 In addition to the requirements above, suspect areas identified at previous surveys are to be
examined.

3.3 Double Hull Oil Tankers 10 – 15 years of age, the following is to apply:
3.3.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.
3.3.2 In application of 3.3.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.3.3 In application of 3.3.1 above, an underwater survey may be considered in lieu of the requirements
of 4.2.

3.4 Double Hull Oil Tankers over 15 years of age, the following is to apply:
3.4.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.

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3.4.2 In application of 3.4.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.4.3 In application of 3.4.1 above, a survey in dry dock is to be part of the intermediate survey. The
overall and close-up surveys and thickness measurements, as applicable, of the lower portions of the cargo
tanks and water ballast tanks are to be carried out in accordance with the applicable requirements for
intermediate surveys, if not already performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 All cargo tanks, Ballast Tanks, including double bottom tanks, pump rooms, pipe tunnels, cofferdams
and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this examination is to be
supplemented by thickness measurement and testing required in 4.5 and 4.6, to ensure that the structural
integrity remains effective. The aim of the examination is to discover Substantial Corrosion, significant
deformation, fractures, damages or other structural deterioration, that may be present.
4.1.4 Cargo piping on deck, including Crude Oil Washing (COW) piping, Cargo and Ballast piping within
the above tanks and spaces are to be examined and operationally tested to working pressure to attending
Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory. Special attention is to be
given to any ballast piping in cargo tanks and cargo piping in ballast tanks and void spaces, and Surveyors are
to be advised on all occasions when this piping, including valves and fittings are open during repair periods
and can be examined internally.

4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo tanks and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

4.3 Tank Protection

4.3.1 Where provided, the condition of the corrosion prevention system of cargo tanks is to be examined.

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4.3.2 A Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than GOOD condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

4.3.3 Thickness measurements are to be carried out as deemed necessary by the surveyor.

4.4 Extent of Overall and Close-up Survey

4.4.1 An Overall Survey of all tanks and spaces is to be carried out at each Class Renewal Survey.
4.4.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-I.4.
4.4.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the tanks under survey, the condition of the corrosion prevention system and also in the
following cases:

1) In particular, tanks having structural arrangements or details which have suffered defects in similar
tanks or on similar ships according to available information.

2) In tanks which have structures approved with reduced scantlings due to an approved corrosion
control system.

4.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-I.4 may be specially considered.

4.5 Extent of Thickness Measurement

4.5.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in
Table 4-I.5.
4.5.2 Provisions for extended measurements for areas with Substantial Corrosion are given in Annex B.5,
and as may be additionally specified in the Survey Programme as required by A.8. These extended thickness
measurements are to be carried out before the survey is credited as completed. Suspect Areas identified
at previous surveys are to be examined. Areas of substantial corrosion identified at previous surveys are to
have thickness measurements taken.
For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas are
required to be examined and additional thickness measurements are to be carried out at annual and
intermediate surveys.
4.5.3 The Surveyor may further extend the thickness measurements as deemed necessary.
4.5.4 For areas in tanks where hard protective coating are found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-I.5 may be specially considered.
4.5.5 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements.
4.5.6 In cases where two or three sections are to be measured, at least one is to include a Ballast Tank
within 0,5L amidships.

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4.6 Extent of Tank testing

4.6.1 The minimum requirements for ballast tank testing are given in 4.6.3 and Table 4-I.6, whereas, for
cargo tank testing are given in 4.6.4 and Table 4-I.6. The Surveyor may require tank testing to be extended
as deemed necessary.
4.6.2 Cargo tank testing carried out by the vessel’s crew under the direction of the Master may be
accepted by the surveyor provided the following conditions are complied with:

1) a tank testing procedure has been submitted by the owner and reviewed by BKI prior to the testing
being carried out;

2) the tank testing is carried out prior to overall survey or close-up survey;

3) the tank testing is carried out within Class Renewal Survey window and not more than three months
prior to the date on which the overall or close up survey is completed;

4) the tank testing has been satisfactorily carried out and there is no record of leakage, distortion or
substantial corrosion that would affect the structural integrity of the tank;

5) the satisfactory results of the testing is recorded in the vessel’s logbook; and

6) the internal and external condition of the tanks and associated structure are found satisfactory by
the surveyor at the time of the overall and close up survey.

4.6.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
4.6.4 Boundaries of cargo tanks are to be tested to the highest point that liquid will rise under service
conditions.
4.6.5 The testing of double bottom tanks and other spaces not designed for the carriage of liquid may
be omitted, provided a satisfactory internal examination together with an examination of the tanktop is
carried out.

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Table 4-I.4 Class Renewal Surveys of Double Hull Oil Tankers, Ore/Oil Ships etc. Minimum Requirements
for Close-Up Surveys

Class Renewal Survey

Class Renewal Survey No. I Class Renewal Survey No. II Class Renewal Survey No. III
No. IV and
age ≤ 5 5 < age ≤ 10 10 < age ≤ 15
Subsequent age > 15
As for Class Renewal
One web frame (1), in a All web frames (1), in a ballast All web frames (1), in all
Survey for age from
ballast tank (see Note 1) tank (see Note 1) ballast tanks
10 to 15 years
The knuckle area and the
upper part (5 metres Additional transverse
approximately) of one web areas as deemed
frame in each remaining necessary by BKI
ballast tank (6)

All web frames (7), including

One deck transverse, in a One deck transverse, in two deck transverse and cross
cargo oil tank (2) cargo oil tanks (2) ties, if fitted, in a cargo oil
tank

One web frame (7), including

deck transverse and cross
ties, if fitted, in each
remaining cargo oil tank
One transverse bulkhead (4), All transverse bulkheads, in
One transverse bulkhead (4),
in each ballast tank (see Note all cargo oil (3) and ballast (4)
in a ballast tank (see Note 1)
1) tanks
One transverse bulkhead (5), One transverse bulkhead (5),
in a cargo oil centre tank in two cargo oil centre tanks

One transverse bulkhead (5),

One transverse bulkhead (5),
in a cargo oil wing tank (see
in a cargo oil wing tank (see Note 2)
Note 2)
(1), (2), (3), (4), (5), (6) and (7) are areas to be subjected to close-up surveys and thickness measurements (see Fig. 4-I.2
and 4-I.3).
(1): Web frame in a ballast tank means vertical web in side tank, hopper web in hooper tank, floor in double bottom tank and
deck transverse in double deck tank (where fitted), including adjacent structural members. In fore and aft peak tanks web
frame means a complete transverse web frame ring including adjacent structural members
(2): Deck transverse, including adjacent deck structural members (or external structure on deck in way of the tank, where
applicable)
(3): Transverse bulkhead complete in cargo tanks, including girder system, adjacent structural members (such as longitudinal
bulkheads) and internal structure of lower and upper stools, where fitted
(4): Transverse bulkhead complete in ballast tanks, including girder system and adjacent structural members, such as
longitudinal bulkheads, girders in double bottom tanks, inner bottom plating, hopper side, connecting brackets
(5): Transverse bulkhead lower part in cargo tank, including girder system, adjacent structural members (such as longitudinal
bulkheads) and internal structure of lower stool, where fitted
(6): The knuckle area and the upper part (5 metres approximately), including adjacent structural members. Knuckle area is
the area of the web frame around the connections of the slope hopper plating to the inner hull bulkhead and the inner
bottom plating, up to 2 metres from the corners both on the bulkhead and the double bottom
(7): Web frame in a cargo oil tank means deck transverse, longitudinal bulkhead structural elements and cross ties, where
fitted, including adjacent structural members
Note 1:
Ballast tank: Apart from the fore and aft peak tanks, the term ”ballast tank”” has the following meaning:
.1 all ballast compartments (hopper tank, side tank and double-deck tank, if separate from double-bottom tank) located on
one side, i.e. portside or starboard side, and additionally double-bottom tank on portside plus starboard side, when the
longitudinal central girder is not watertight and, therefore, the double-bottom tank is a unique compartment from portside
to starboard side; or
.2 all ballast compartments (double-bottom tank, hopper tank, side tank and double-deck tank) located on one side, i.e.
portside or starboard side, when the longitudinal central girder is watertight and, therefore, the portside double-bottom
tank separate from the starboard-side double-bottom tank.
Note 2:
Where no centre cargo tanks are fitted (as in case of centre longitudinal bulkhead), transverse bulkheads in wing tanks are
to be surveyed

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Figure 4-I.2 Close up survey requirements for Double hull Oil Tankers. Areas (1) to (5)

Figure 4-I.3 Close up survey requirements for Double hull Oil Tankers. Areas (6) and (7)

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Table 4-I.5 Class Renewal Surveys of Double Hull Oil Tankers, Oil Ships etc. Minimum Requirements for
Thickness Measurements

Class Renewal Survey Class Renewal Survey Class Renewal Survey

Class Renewal Survey
No. II No. III No. IV and Subsequent
No. I age ≤ 5
5 < age ≤ 10 10 < age ≤ 15 age > 15
1. Suspect areas 1. Suspect areas 1. Suspect areas 1. Suspect areas
2. Within the cargo area: 2. Within the cargo area: 2. Within the cargo area:
.1 Each deck plate .1 Each deck plate .1 Each deck plate
.2 One transverse .2 Two transverse .2 Three transverse
section sections(1) sections(1)
.3 All wind and water strakes .3 Each bottom plate
Selected wind and Selected wind and
All wind and water strakes,
3. water strakes outside 3. water strakes outside 3.
full length
the cargo area the cargo area
Measurements, for Measurements, for Measurements, for
general assessment general assessment general assessment
and recording of and recording of and recording of
corrosion pattern, of corrosion pattern, of corrosion pattern, of
4. those structural 4. those structural 4. those structural
members subject to members subject to members subject to
close-up survey close-up survey close-up survey
according to according to according to
Table 4-I.4. Table 4-I.4. Table 4-I.4.
(1)
at least one section is to include a ballast tank within 0,5L amidships.

Table 4-I.6 Class Renewal Surveys of Double Hull Oil Tankers, Oil Ships, etc. Minimum Requirements for
Tank Testing

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
All ballast tank boundaries
Cargo tank boundaries facing ballast
tanks, void spaces, pipe tunnels, pump All cargo tank bulkheads
rooms or cofferdams

D. Chemical Tankers
1. General requirements
1.1 Application
1.1.1 The following requirements apply to all self-propelled Chemical tankers more than 500 GT with
integral tanks as defined in the Rules for Ships Carrying Dangerous Chemicals in Bulk (Pt.1, Vol.X).
If a chemical tanker is constructed with both integral and independent tanks, these requirements are
applicable only to that portion of the cargo length containing integral tanks. Combined gas carriers/chemical
tankers with independent tanks within the hull, are to be surveyed as gas carriers.
1.1.2 The requirements apply to surveys of hull structure and piping systems in way of cargo tanks, pump
rooms, cofferdams, pipe tunnels, void spaces within the cargo area and all Ballast Tanks. The requirements
are not applicable for independent tanks on deck.
1.1.3 Unless otherwise stipulated in the following, the requirements of Section 3 apply.
1.1.4 In the case of chemical tankers also qualified as oil or product carriers, additionally, requirements
in B. are to be observed.
1.1.5 Definitions of any terms used in this section are in accordance with Annex A.7.

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1.2 Extent of surveys

1.2.1 The surveys are to cover all installations, outfit and equipment related to the carriage and handling
of chemicals. They also cover the surveys required by the IMO Codes for Chemical Tankers 3) .
1.2.2 The protective equipment and the safety equipment required by the Codes for protection of the
personnel as well as other equipment and outfit which are no class requirement items are not covered by
the present Rules for Classification and Surveys. These items will, however, be included in the surveys, if
compliance with the requirements of an Administration has to be certified, see also the Rules for Ships
Carrying Dangerous Chemicals in Bulk (Pt.1, Vol.X).
1.2.3 Reference should be made to the procedures stated in the IBC Code regarding the authorization
of recognized institutions, surveys and issuance, validity and extension of certificates. The ”Certificate of
Fitness” required for chemical tankers is issued either by the Administration of the vessel’s flag state or by
BKI if authorized by the respective flag state.
1.2.4 The following defines the minimum extent of examinations. The surveys shall be extended where
substantial corrosion and/or structural defects are found and will include an additional Close Up Survey
(close visual inspection range, preferably within reach of hand) where deemed necessary by the Surveyor.

2. Annual Surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull and piping are maintained in a satisfactory condition and should take into account the service history,
condition and extent of the corrosion prevention system of ballast tanks and areas identified in the survey
reports file.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.

— Examination of watertight penetrations as far as practicable.

2.3 Examination of weather deck

— Examination of cargo tank openings including gaskets, covers, coamings and flame screens.

— Examination of cargo tanks pressure/vacuum valves and flame screens.

— Examination of flame screens on vents to all bunker tanks.

— Examination of cargo, crude oil washing, bunker and vent piping systems, including vent masts and
headers.

2.4 Examination of Cargo Pump Rooms and Pipe Tunnels, if fitted

— Examination of all pump room bulkheads for signs of oil leakage or fractures and, in particular, the
sealing arrangements of all penetrations of pump room bulkheads.

— Examination of the condition of all piping systems.

3)
”Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk” (BCH Code) for ships the keels
of which were laid on or after 12.4.1972, and with some limitations, also for ships built before that date; ”International Code for
the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk” (IBC Code) for ships, the keels of which were laid
on or after 1.7.1986. The IBC Code is also part of the MARPOL Convention (Annex II), and of the SOLAS Convention 1974 (Chapter
VII).

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2.5 Examination of Ballast tanks

2.5.1 Examination of Ballast Tanks where required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out.
2.5.2 When considered necessary by the Surveyor, or when extensive corrosion exists, thickness
measurements are to be carried out and if the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance with
Annex B.5.
These extended thickness measurements are to be carried out before the survey is credited as completed.
2.5.3 Suspect Areas identified at previous surveys are to be examined. Areas of substantial corrosion
identified at previous surveys are to have thickness measurements taken.

3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.
3.1.2 For weather decks, an examination as far as applicable of cargo, crude oil washing, bunker, ballast,
steam and vent piping systems as well as vent masts and headers is to be carried out.
3.1.3 If upon examination there is any doubt as to the condition of the piping, the piping may be required
to be pressure tested, thickness measured, or both.

3.2 Chemical Tankers 5 – 10 years of age, the following is to apply:

3.2.1 For ballast tanks, an Overall Survey of Representative Tanks selected by the Surveyor is to be carried
out. If such inspections reveal no visible structural defects, the examination may be limited to a verification
that the hard-protective coating remains in GOOD condition.
3.2.2 Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than GOOD condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

3.2.3 In addition to the requirements above, suspect areas identified at previous surveys are to be
examined.

3.3 Chemical Tankers 10 – 15 years of age, the following is to apply:

3.3.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.
3.3.2 In application of 3.3.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.3.3 In application of 3.3.1 above, an underwater survey may be considered in lieu of the requirements
of 4.2.

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3.4 Chemical Tankers over 15 years of age, the following is to apply:

3.4.1 The requirements of the Intermediate survey are to be to the same extent as the previous Class
Renewal Survey as required in 4. and A.8. However, pressure testing of cargo and ballast tanks and the
requirements for longitudinal strength evaluation of Hull Girder as required in A.12.1.2 are not required
unless deemed necessary by the attending Surveyor.
3.4.2 In application of 3.4.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.4.3 In application of 3.4.1 above, a survey in dry dock is to be part of the intermediate survey. The
overall and close-up surveys and thickness measurements, as applicable, of the lower portions of the cargo
tanks and water ballast tanks are to be carried out in accordance with the applicable requirements for
intermediate surveys, if not already performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 All cargo tanks, Ballast Tanks, including double bottom tanks, pump rooms, pipe tunnels, cofferdams
and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this examination is to be
supplemented by thickness measurement and testing required in 4.5 and 4.6, to ensure that the structural
integrity remains effective. The aim of the examination is to discover Substantial Corrosion, significant
deformation, fractures, damages or other structural deterioration, that may be present.
4.1.4 Cargo piping on deck and Cargo and Ballast piping within the above tanks and spaces are to be
examined and operationally tested to working pressure to attending Surveyor’s satisfaction to ensure that
tightness and condition remain satisfactory. Special attention is to be given to any ballast piping in cargo
tanks and cargo piping in ballast tanks and void spaces, and Surveyors are to be advised on all occasions
when this piping, including valves and fittings are open during repair periods and can be examined internally.

4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo tanks and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the cargo and ballast tanks are considered to be the parts below light ballast water
line.

4.3 Tank Protection

4.3.1 Where provided, the condition of the corrosion prevention system of cargo tanks is to be examined.

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4.3.2 A Ballast Tank is to be examined at subsequent annual intervals where:

1) a hard-protective coating has not been applied from the time of construction, or

2) a soft or semi-hard coating has been applied, or

3) substantial corrosion is found within the tank, or

4) the hard-protective coating is found to be in less than GOOD condition and the hard-protective
coating is not repaired to the satisfaction of the Surveyor.

4.3.3 Thickness measurements are to be carried out as deemed necessary by the surveyor.

4.4 Extent of Overall and Close-up Survey

4.4.1 An Overall Survey of all tanks and spaces is to be carried out at each Class Renewal Survey.
4.4.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-I.7.
4.4.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the tanks under survey, the condition of the corrosion prevention system and also in the
following cases:

1) In particular, tanks having structural arrangements or details which have suffered defects in similar
tanks or on similar ships according to available information.

2) In tanks which have structures approved with reduced scantlings due to an approved corrosion
control system.

4.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-I.7 may be specially considered.

4.5 Extent of Thickness Measurement

4.5.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-I.8.
4.5.2 Provisions for extended measurements for areas with Substantial Corrosion are given in Annex B.5,
and as may be additionally specified in the Survey Programme as required by A.8. These extended thickness
measurements are to be carried out before the survey is credited as completed. Suspect Areas identified
at previous surveys are to be examined. Areas of substantial corrosion identified at previous surveys are to
have thickness measurements taken.
4.5.3 The Surveyor may further extend the thickness measurements as deemed necessary.
4.5.4 For areas in tanks where hard protective coating are found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-I.8 may be specially considered.
4.5.5 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements.
4.5.6 In cases where two or three sections are to be measured, at least one is to include a Ballast Tank
within 0,5L amidships.

4.6 Extent of Tank testing

4.6.1 The minimum requirements for ballast tank testing are given in 4.6.2 and Table 4-I.9, whereas, for
cargo tank testing are given in 4.6.3 and Table 4-I.9. The Surveyor may require tank testing to be extended
as deemed necessary.

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4.6.2 Cargo tank testing carried out by the vessel’s crew under the direction of the Master may be
accepted by the surveyor provided the following conditions are complied with:

1) a tank testing procedure has been submitted by the owner and reviewed by BKI prior to the testing
being carried out;

2) there is no record of leakage, distortion or substantial corrosion that would affect the structural
integrity of the tank;

3) the tank testing has been satisfactorily carried out within Class Renewal Survey window not more
than 3 months prior to the date of the survey on which the overall or close up survey is completed;

4) the satisfactory results of the testing is recorded in the vessel’s logbook;

5) the internal and external condition of the tanks and associated structure are found satisfactory by
the surveyor at the time of the overall and close up survey.

4.6.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
4.6.4 Boundaries of cargo tanks are to be tested to the highest point that liquid will rise under service
conditions.
4.6.5 The testing of double bottom tanks and other spaces not designed for the carriage of liquid may
be omitted, provided a satisfactory internal examination together with an examination of the tanktop is
carried out.

4.7 Chemical Tankers over 10 years of age

4.7.1 Selected steel cargo pipes outside cargo tanks and ballast pipes passing through cargo tanks are to
be:

1) Thickness measured at random or selected pipe lengths to be opened for internal inspection;

2) Pressure tested to the maximum working pressure.

4.7.2 Special attention is to be given to cargo/slop discharge piping through Ballast Tanks and void spaces.

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Figure 4-I.4 Areas (A), (B), (C), (D) for close up survey of single skin chemical tankers

Figure 4-I.5 Areas (A), (B), (C), (D) for close up survey of single skin chemical tankers of combined type

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Table 4-I.7-1 Class renewal Survey of Single Skin Chemical Tankers Minimum Requirements for Close Up
Surveys

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
ONE WEB FRAME ALL WEB FRAMES ALL WEB FRAMES
(1) (1) (1) As renewal survey No. III
RING RINGS RINGS
in a ballast wing tank
in a ballast wing tank or ballast tank (see in all ballast tanks
Note I)

Additional transverse
ONE DECK ONE DECK ALL WEB FRAMES
(2) (2) (1) areas as deemed
TRANSVERSE TRANSVERSE RINGS
necessary by BKI
in each remaining
in a cargo tank or on
ballast tank or on in a cargo wing tank.
deck
deck

ONE DECK
(2)
TRANSVERSE
in a cargo wing tank
or on deck

ONE TRANSVERSE ONE DECK TRANS- ONE WEB FRAME

(4) (2) (1)
BULKHEAD VERSE RING
lower part in a in two cargo centre in each remaining
ballast tank tanks or on deck cargo tank

ONE TRANSVERSE BOTH TRANSVERSE ALL TRANSVERSE

(4) (3) (3)
BULKHEAD BULKHEADS BULKHEADS
lower part in a cargo
in a ballast wing tank in all cargo tanks
wing tank

ONE TRANSVERSE ONE TRANSVERSE ALL TRANSVERSE

(4) (4) (3)
BULKHEAD BULKHEAD BULKHEADS
Lower part in a cargo lower part in each
centre tank (see remaining ballast in all ballast tanks
Note II) tank

ONE TRANSVERSE
(4)
BULKHEAD
lower part in two
cargo centre tanks
(see Note II)

ONE TRANSVERSE
(4)
BULKHEAD
lower part in a cargo
wing tank

Note I: Ballast double hull tank means double bottom tank plus double side tank plus double deck tank, as applicable,
even if these tanks are separate.
Note II: Where no centre cargo tanks are fitted (as in the case of centre longitudinal bulkhead), transverse bulkheads
in wing tanks are to be surveyed.
(1)-(4): are areas to be subjected to close-up surveys and thickness measurements (see Fig. 4-I.4 and Fig. 4-I.5).
(1) Complete transverse web frame ring including adjacent structural members.
(2) Deck transverse including adjacent deck structural members.
(3) Transverse bulkhead complete including girder system and adjacent structural members.
(4) Transverse bulkhead lower part including girder system and adjacent structural members

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Table 4-I.7-2 Class renewal Survey of Double Skin Chemical Tankers Minimum Requirements for Close
Up Surveys

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
As renewal survey
(1) ONE WEB FRAME RING (1) ALL WEB FRAME RINGS (1) ALL WEB FRAME RINGS
No.III
in a ballast wing tank or
in a ballast double hull
ballast double hull tank in all ballast tanks
tank (see Note I)
(see Note I)

Additional transverse
(2) ONE DECK TRANSVERSE (6) THE KNUCKLE AREA AND (7) ALL WEB FRAME RINGS areas as deemed
THE UPPER PART (3 metres necessary by BKI
in a cargo tank or on deck approx.) of one web frame in a cargo wing tank
in each remaining ballast
tank
ONE TRANSVERSE
(4) (2) ONE DECK TRANSVERSE (7) ONE WEB FRAME RING
BULKHEAD
in each remaining cargo
in a ballast tank (see Note I) in two cargo tanks
tank

ONE TRANSVERSE ALL TRANSVERSE

(5) (3)
BULKHEAD BULKHEADS
in a cargo wing tank in all cargo tanks

ONE TRANSVERSE ONE TRANSVERSE ALL TRANS-VERSE

(5) (4) (4)
BULKHEAD BULKHEAD BULKHEADS
in a cargo centre tank (see in each ballast tank (see
in all ballast tanks
Note II) Note I)

ONE TRANSVERSE
(5)
BULKHEAD
in two cargo centre tanks
(see Note II)

ONE TRANSVERSE
(5)
BULKHEAD
in a cargo wing tank
(1), (2), (3), (4), (5), (6) and (7) are areas to be subjected to close-up surveys and thickness measurements
(see Fig. 4-I.6 – 4.I.8).
(1): Web frame in a ballast tank means vertical web in side tank, hopper web in hopper tank, floor in double bottom tank and
deck transverse in double deck tank (where fitted), including adjacent structural members. In fore and aft peak tanks web
frame means a complete transverse web frame ring including adjacent structural members.
(2): Deck transverse, including adjacent deck structural members (or external structure on deck in way of the tank, where
applicable).
(3): Transverse bulkhead complete in cargo tanks, including girder system, adjacent structural members (such as
longitudinal bulkheads) and internal structure of lower and upper stools, where fitted.
(4): Transverse bulkhead complete in ballast tanks, including girder system and adjacent structural members, such as
longitudinal bulkheads, girders in double bottom tanks, inner bottom plating, hopper side, connecting brackets.
(5): Transverse bulkhead lower part in cargo tank, including girder system, adjacent structural members (such as
longitudinal bulkheads) and internal structure of lower stool, where fitted.
(6): The knuckle area and the upper part (3 m approximately), including adjacent structural members. Knuckle area is the
area of the web frame around the connections of the slope hopper plating to the inner hull bulkhead and the inner bottom
plating, up to 2 m from the corners both on the bulkhead and the double bottom.
(7): Web frame in a cargo tank means deck transverse, longitudinal bulkhead vertical girder and cross ties, where fitted,
including adjacent structural members.

Note I: Ballast double hull tank means double bottom tank plus double side tank plus double deck tank, as applicable, even
if these tanks are separate.
Note II: Where no centre cargo tanks are fitted (as in the case of centre longitudinal bulkhead), transverse bulkheads in
wing tanks are to be surveyed.

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Figure 4-I.6 Representative transverse section of double skin chemical tanker. Areas 1 and 2

Figure 4-I.7 Representative transverse section of double skin chemical tanker. Areas 3, 4 and 5

Figure 4-I.8 Representative transverse section of double skin chemical tanker. Areas 6 and 7

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Table 4-I.8 Class Renewal Surveys of Chemical Tankers Minimum Requirements for Thickness
Measurements

Class Renewal Survey [No.] and ship’s age [years]

I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15 IV. and subsequent, age > 15
Within the cargo area:
Within the cargo area: Within the cargo area:
– each deck plate
– each deck plate – each deck plate
1 1 – three transverse sections1
– one transverse section – two transverse sections
– each bottom plate
Measurements of structural members subject to Close-Up Survey according to Table 4-I.7-1 and Table 4-I.7-2 for
general assessment and recording of corrosion pattern
Suspect Areas
Selected wind and water strakes, outside the cargo area All wind and water strakes
All wind and water strakes full length
within the cargo area
1
At least one section is to include a ballast tank within 0,5L amidships.

Table 4-I.9 Class Renewal Surveys of Chemical Tankers Minimum Requirements for Tank Testing

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
All ballast tank boundaries
Cargo tank boundaries
facing ballast tanks, void
All cargo tank bulkheads
spaces, pipe tunnels, pump
rooms or cofferdams

E. Bulk Carriers
1. General Requirements
1.1 Application
1.1.1 The following requirements apply to all self- propelled Single skin Bulk carriers of 500 gross tonnage
and above with qualifier notation ESP, other than Double skin Bulk Carriers.
1.1.2 The requirements apply to surveys of hull structure and piping systems in way of cargo holds,
cofferdams, pipe tunnels, void spaces and fuel oil tanks within the cargo area, and to all ballast tanks.
1.1.3 Unless otherwise stipulated in the following, the requirements of Section 3 apply.
1.1.4 For bulk carriers also designed for the carriage of crude oil, additionally, requirements in B. are to
be observed.
1.1.5 Additional requirements for survey, assessment and repair of hull structures, see Guidance for
Marine Industry (Pt.1, Vol.AC) Sec.4 R-76

1.2 Extent of surveys

1.2.1 The requirements contain the minimum extent of examination, thickness measurement and tank
testing. The surveys are to be extended where substantial corrosion and/or structural defects are found,
and will include an additional Close-Up Survey when necessary.
1.2.2 Bulk carriers that are required to comply with Rules for Hull (Pt.1, Vol.II) Sec.23, J (see 1.3.1) are
subject to the additional thickness measurement guidance contained in Annex B.6 with respect to the
vertically corrugated transverse watertight bulkhead between cargo holds Nos. 1 and 2 for purposes of
determining compliance with Rules for Hull (Pt.1, Vol.II) Sec.23, J prior to the relevant compliance deadline

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stipulated as follows and at subsequent Intermediate surveys (for ships over 10 years of age) and Class
Renewal Surveys for purposes of verifying continuing compliance with Rules for Hull (Pt.1, Vol.II) Sec.23, J.

1) for bulk carriers which were 20 years of age or more on 1 July 1998, by the due date of the first
intermediate, or the due date of the first Class Renewal Survey to be held after 1 July 1998, whichever
comes first;

2) for bulk carriers which were 15 years of age or more but less than 20 years of age on 1 July 1998, by
the due date of the first Class Renewal Survey to be held after 1 July 1998, but not later than 1 July
2002;

3) for bulk carriers which were 10 years of age or more but less than 15 years of age on 1 July 1998, by
the due date of the first intermediate, or the due date of the first Class Renewal Survey to be held
after the date on which the ship reaches 15 years of age but not later than the date on which the ship
reaches 17 years of age;

4) for bulk carriers which were 5 years of age or more but less than 10 years of age on 1 July 1998, by
the due date, after 1 July 2003, of the first intermediate or the first Class Renewal Survey after the
date on which the ship reaches 10 years of age, whichever occurs first;

5) for bulk carriers which were less than 5 years of age on 1 July 1998, by the date on which the ship
reaches 10 years of age.

6) completion prior to 1 July 2003 of an intermediate or Class Renewal Survey with a due date after 1
July 2003 cannot be used to postpone compliance. However, completion prior to 1 July 2003 of an
intermediate survey the window for which straddles 1 July 2003 can be accepted.

These requirements are to applied in conjunction with the damage stability requirements set forth in Rules
for Hull (Pt.1, Vol.II) Sec.36, C.2.3.
1.2.3 Bulk carriers which are required to comply with Annex B.11 are subject to the additional thickness
measurement guidance contained in Annex B.7 with respect to the side shell frames and brackets for the
purposes of determining compliance with Annex B.11 prior to the relevant compliance deadline stipulated
as follows and at subsequent intermediate and Class Renewal Surveys for purposes of verifying continuing
compliance with Annex B.11.

A) for bulk carriers which will be 15 years of age or more on 1 January 2004 by the due date of the first
Intermediate or Class Renewal Survey after that date;

B) for bulk carriers which will be 10 years of age or more on 1 January 2004 by the due date of the first
Class Renewal Survey after that date;

C) for bulk carriers which will be less than 10 years of age on 1 January 2004 by the date on which the
ship reaches 10 years of age.

D) completion prior to 1 January 2004 of an Intermediate or Class Renewal Survey with a due date after
1 January 2004 cannot be used to postpone compliance. However, completion prior to 1 January
2004 of an Intermediate survey the window for which straddles 1 January 2004 can be accepted.

OBO carriers subject to Annex B.11.1 are to be assessed for compliance with the requirements of Annex
B.11 and steel renewal, reinforcement or coating, where required in accordance with this Annex, is to be
carried out in accordance with the following schedule and at subsequent intermediate and Class Renewal
Surveys.

A) for OBO carriers which will be 15 years of age or more on 1 July 2005 by the due date of the first
Intermediate or Class Renewal Survey after that date;

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B) for OBO carriers which will be 10 years of age or more on 1 July 2005 by the due date of the first Class
Renewal Survey after that date;

C) for OBO carriers which will be less than 10 years of age on 1 July 2005 by the date on which the ship
reaches 10 years of age.

D) completion prior to 1 July 2005 of an Intermediate or Class Renewal Survey with a due date after 1
July 2005 cannot be used to postpone compliance. However, completion prior to 1 July 2005 of an
Intermediate survey the window for which straddles 1 July 2005 can be accepted.

1.2.4 For Bulk carriers with hybrid cargo hold arrangements, e.g. with some cargo holds of single side skin
and others of double side skin, the requirements of F. are to apply to cargo holds of double side skin and
associated wing spaces only.

1.3 Additional Safety Measures

1.3.1 Requirement subject to Rules for Hull (Pt.1, Vol.II) Sec.23, J and K.

The requirement of Rules for Hull (Pt.1, Vol.II) Sec.23, J(Evaluation of Scantlings of the Transverse Watertight
Corrugated Bulkhead between Cargo Holds Nos. 1 and 2, with Cargo Hold No. 1 Flooded) and Rules for Hull
(Pt.1, Vol.II) Sec.23, K (Evaluation of Allowable Hold Loading of Cargo Hold No. 1 with Cargo Hold No. 1
Flooded) apply to all Bulk carriers of 150 m in length and above, in the foremost hold, intending to carry
solid bulk cargoes having a density of 1,78 t/m3 , or above, with single deck, topside tanks and hopper tanks,
fitted with vertically corrugated transverse watertight bulkheads between cargo holds No. 1 and 2 where:

A) the foremost hold is bounded by the side shell only for ships which were contracted for construction
prior to 1 July 1998, and have not been constructed in compliance with Rules for Hull (Pt.1, Vol.II)
Sec.23, E,

B) the foremost hold is double side skin construction of less than 760 mm breadth measured
perpendicular to the side shell in ships, the keels of which were laid, or which were at a similar stage
of construction, before 1 July 1999 and have not been constructed in compliance with Rules for Hull
(Pt.1, Vol.II) Sec.23, E

In connection with this strength calculation additional thickness measurements have to be taken
of the aforementioned structures. Renewal and strengthening required are to be approved by
BKI. Thickness measurements and strength calculations are to be performed at all subsequent
Intermediate Surveys (for ships over 10 years) and Class Renewal Surveys.

1.3.2 Damage stability requirements

Bulk carriers of 150 m in length and above of single side skin construction have to comply with the damage
stability requirements as specified in Rules for Hull (Pt.1, Vol.II) Sec.36, C.2 (see also SOLAS Reg. XII/4).
For possible exemptions please refer to SOLAS Reg. XII/9.

1.3.3 Cargo hold hatch cover securing arrangements

Bulk carriers which were not built in accordance with the particular requirements 4) for evaluation of
the scantlings of hatch covers and hatch coamings of cargo holds have to comply with the additional
requirements 5) for cargo hatch cover securing arrangements.
4)
For requirements, see Rules for Hull (Pt.1, Vol.II) Sec.17, A-C
5)
For requirements, see Rules for Hull (Pt.1, Vol.II) Sec.17, F

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1.3.4 Side shell frames and brackets

Single side bulk carriers which were not built in accordance with the particular requirements for side
structures, as well as Oil/Bulk/Ore (OBO) carriers, have to be assessed for compliance with the respective
renewal criteria for side shell frames and brackets 6) .
In connection with this, additional thickness measurements and strength calculations have to be performed
for the aforementioned structures. Renewal and strengthening required are to be approved by BKI.
Thickness measurements and strength calculations have to be performed at all subsequent intermediate
and Class Renewal Surveys.

1.3.5 Water ingress detection and dewatering system

All bulk carriers have to comply with the requirements 7) concerning water level detectors in hold, ballast
and dry spaces, as well as with the availability requirements 14 8) of pumping systems for dewatering and
pumping ballast tanks forward of the collision bulkhead and bilges of dry spaces forward of the foremost
cargo hold. Function tests are to be carried out at a random basis at all subsequent Annual Surveys and in
full scope at Class Renewal Surveys.

1.3.6 Strength and securing of small hatches on exposed Fore Deck

All bulk carriers have to comply with the requirements 9) concerning the strength and securing devices for
small hatches fitted on the exposed fore deck.
Those hatches are designed for access to spaces below deck and are capable to be closed weather-tight or
watertight, as applicable. There opening is normally 2,5 m2 or less.

1.3.7 Strength of Fore Deck fittings and Equipment

All bulk carriers have to comply with the requirements 10) concerning the strength of air pipes, ventilator
pipes and their closing devices and windlasses.

1.3.8 Restriction from sailing with any hold empty

Bulk carriers of 150 m in length L and upwards of single side skin construction carrying dry cargoes having a
density of 1,78 t/m3 and above, have to comply with the requirements 11) concerning the loading of cargo
holds in full load condition (at least 90% of ship’s deadweight). Requirements are applicable after the vessel
reaches 10 years of age and only if the vessel meets not the requirements for withstanding flooding of any
one cargo hold.

1.4 Rescue and emergency response equipment

If breathing apparatus and/or other equipment is used as ’Rescue and emergency response equipment’
then it is recommended that the equipment should be suitable for the configuration of the space being
surveyed.
6)
For requirements, see Annex B.11
7)
For requirements, see SOLAS XII/12 and Guidance for Code and Convention Interpretations (Pt.1, Vol.Y) Sec.11.SC 180
8)
For requirements, see SOLAS XII/13 and Guidance for Code and Convention Interpretations (Pt.1, Vol.Y) Sec.11.SC 179
9)
For requirements, see Rules for Hull (Pt.1, Vol.II), Sec.17, D
10)
For requirements, see Rules for Hull (Pt.1, Vol.II), Sec.21, F.5
11)
For requirements, see SOLAS XII/14

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2. Annual surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that
the hull, weather decks, hatch covers, coamings and piping are maintained in a satisfactory condition and
should take into account the service history, condition and extent of the corrosion prevention system of
ballast tanks and areas identified in the survey report file.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.

— Examination of watertight penetrations as far as practicable.

2.3 Examination of weather deck, hatch covers and coamings

2.3.1 Confirmation is to be obtained that no unapproved changes have been made to the hatch covers,
hatch coamings and their securing and sealing devices since the last survey.
2.3.2 A thorough survey of cargo hatch covers and coamings is only possible by examination in the open
as well as closed positions and should include verification of proper opening and closing operation. As a
result, at least the hatch cover sets within the forward 25 % of the ships length and at least one additional
set, such that all the sets on the ship are assessed at least once in every five-year period, should be surveyed
open, closed and in operation to the full extent in each direction at each Annual Survey, including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed condition; and

— operational testing of hydraulic and power components, wires, chains and link drives

The closing of covers should include the fastening of all peripheral, and cross joint cleats or other securing
devices. Particular attention should be paid to the condition of hatch covers in the forward 25 % of the
ships length, where the sea loads are normally greatest.
2.3.3 If there are indications of difficulty in operation and securing hatch covers, additional sets above
those required in 2.3.2, at the discretion of the surveyor, should be tested in operation.
2.3.4 Where the cargo hatch securing system does not function properly, repairs should be carried out
under the supervision of the BKI’s surveyor. Where hatch covers or coamings undergo substantial repairs,
the strength of securing devices should be upgraded to comply with Annex 11 of IMO Resolution MSC 261
(84) as amended or Rules for Hull (Pt.1, Vol.II) Sec.17.B.5.
2.3.5 For each cargo hatch cover set, at each Annual Survey, the following items should be surveyed:

— cover panels, including side plates, and stiffener attachments that may be accessible in the open
position by Close-Up Survey (for corrosion, cracks, deformation);

— sealing arrangements of perimeter and cross joints (gaskets for condition and permanent
deformation, flexible seals on combination carriers, gasket lips, compression bars, drainage channels
and non-return valves);

— clamping devices, retaining bars, cleating (for wastage, adjustment, and condition of rubber
components);

— closed cover locating devices (for distortion and attachment);

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— chain or rope pulleys;

— guides;

— guide rails and track wheels;

— stoppers;

— wires, chains, tensioners and gypsies;

— hydraulic system, electrical safety devices and interlocks; and

— end and interpanel hinges, pins and stools where fitted.

2.3.6 At each hatchway, at each Annual Survey, the coamings, with plating, stiffeners and brackets should
be checked for corrosion, cracks and deformation, especially of the coaming tops, including close-up survey.
2.3.7 Where considered necessary, the effectiveness of sealing arrangements may be proved by hose or
chalk testing supplemented by dimensional measurements of seal compressing components.
2.3.8 Where portable covers, wooden or steel pontoons are fitted, the satisfactory condition of the
following should be confirmed:

— wooden covers and portable beams, carriers or sockets for the portable beam, and their securing
devices;

— steel pontoons, including close-up survey of hatch cover plating;

— tarpaulins;

— cleats, battens, and wedges;

— hatch securing bars and their securing devices;

— loading pads/bars and the side plate edge;

— guides plates and chocks;

— compression bars; drainage channels and drain pipes (if any).

2.3.9 Examination of flame screens on vents to all bunker tanks.

2.3.10 Examination of bunker and vent piping systems, including ventilators.

2.4 Examination of Cargo holds

2.4.1 Bulk Carriers 10-15 years of age, the following is to apply:
1) Overall Survey of all cargo holds.

2) Close-up survey of sufficient extent, minimum 25% of frames, to establish the condition of the lower
region of the shell frames including approx. lower one third length of side frame at side shell and
side frame end attachment and the adjacent shell plating in the forward cargo hold. Where this level
of survey reveals the need for remedial measures, the survey is to be extended to include a Close-up
Survey of all of the shell frames and adjacent shell plating of that cargo hold as well as a Close-up
survey of sufficient extent of all remaining cargo holds.

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3) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance
with Annex B.5. These thickness measurements are to be carried out before the annual survey is
credited as completed. Suspect Areas identified at previous surveys are to be examined. Areas of
substantial corrosion identified at previous surveys are to have thickness measurements taken.

For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be
omitted where a protective coating has been applied in accordance with the coating manufacturer’s
requirements and is maintained in good condition.

4) Where the protective coating in cargo holds is found to be in GOOD condition, the extent of close-up
surveys and thickness measurements may be specially considered.

5) All piping and penetrations in cargo holds, including overboard piping, are to be examined.

2.4.2 Bulk Carriers over 15 years of age, the following is to apply:

1) Overall Survey of all cargo holds.

2) Close-up survey of sufficient extent, minimum 25% of frames, to establish the condition of the lower
region of the shell frames including approx. lower one third length of side frame at side shell and
side frame end attachment and the adjacent shell plating in the forward cargo hold and one other
selected cargo hold. Where this level of survey reveals the need for remedial measures, the survey
is to be extended to include a Close-up Survey of all of the shell frames and adjacent shell plating of
that cargo hold as well as a Close-up Survey of sufficient extent of all remaining cargo holds.

3) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance
with Annex B.5. These extended thickness measurements are to be carried out before the annual
survey is credited as completed. Suspect Areas identified at previous surveys are to be examined.
Areas of substantial corrosion identified at previous surveys are to have thickness measurements
taken.

For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be
omitted where a protective coating has been applied in accordance with the coating manufacturer’s
requirements and is maintained in good condition.

4) Where a hard-protective coating is fitted in cargo holds and is found in GOOD condition, the extent
of close-up surveys and thickness measurements may be specially considered.

5) All piping and penetrations in cargo holds, including overboard piping, are to be examined.

2.5 Examination of Ballast tanks

2.5.1 Examination of Ballast Tanks when required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out. When considered necessary by the surveyor, or where
extensive corrosion exists, thickness measurements are to be carried out. If the results of these thickness
measurements indicate that Substantial Corrosion is found, the extent of thickness measurements is to
be increased in accordance with Annex B.5. These extended thickness measurements are to be carried out
before the survey is credited as completed. Suspect Areas identified at previous surveys are to be examined.
Areas of substantial corrosion identified at previous survey are to have thickness measurements taken.
For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be omitted
where a protective coating has been applied in accordance with the coating manufacturer’s requirements
and is maintained in good condition.

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2.6 Additional Annual survey requirements for the foremost cargo hold acc. to SOLAS Reg. XII/9.1
2.6.1 Ships subject to SOLAS XII/9.1 are those meeting all the following conditions:

— Bulk Carriers of 150 m in length and upwards of single side skin construction,

— carrying solid bulk cargoes having a density of 1780 kg/m3 and above,

— contracted for construction (see Note 1) before 1 July 1999, and

— constructed with an insufficient number of transverse watertight bulkheads to enable them to

withstand flooding of the foremost cargo hold in all loading conditions and remain afloat in a
satisfactory condition of equilibrium as specified in SOLAS XII/4.3.

Note 1:
“The “contracted for construction” date means the date on which the contract to build the vessel is signed
between the prospective owner and the shipbuilder. For further details regarding the date of “contract
for construction”, refer to IACS Procedural Requirement (PR) No.29.”
2.6.2 In accordance with SOLAS XII/9.1, for the foremost cargo hold of such ships, the additional survey
requirements listed in Annex B.8 shall apply.

2.7 Additional Annual survey requirements after determining compliance with SOLAS XII/12 and XII/13
2.7.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry space water
level detectors, the annual survey is to include an examination and a test, at random, of the water ingress
detection systems and of their alarms.
2.7.2 For ships complying with the requirements of SOLAS XII/13 for the availability of pumping systems,
the annual survey is to include an examination and a test, of the means for draining and pumping ballast
tanks forward of the collision bulkhead and bilges of dry spaces any part of which extends forward of the
foremost cargo hold, and of their controls.

3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.

3.2 Bulk carriers 5 - 10 years of age. The following is to apply:

3.2.1 Ballast Tanks
1) For tanks used for water ballast, an overall survey of representative spaces selected by the Surveyor
is to be carried out. The selection is to include fore and aft peak tanks and a number of other tanks,
taking into account the total number and type of ballast tanks. If such overall survey reveals no
visible structural defects, the examination may be limited to verification that the corrosion prevention
system remains efficient.

2) Where a hard coating is found to be in less than GOOD condition, corrosion or other defects are
found in water Ballast tanks or where a hard-Protective Coating was not applied from the time of
construction, the examination is to be extended to other Ballast tanks of the same type.

3) In ballast tanks other than double bottom tanks, where a hard-Protective Coating is found to be
in less than GOOD condition, and it is not renewed, or where soft or semi-hard coating has been
applied, or where a hard-protective coating was not applied from the time of construction, the tanks
in question are to be examined and thickness measurements carried out as considered necessary at

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annual intervals. When such breakdown of hard protective coating is found in ballast double bottom
tanks, or where a soft or semi-hard coating has been applied, or where a hard-protective coating
has not been applied, the tanks in question may be examined at annual intervals. When considered
necessary by the Surveyor, or where extensive corrosion exists, thickness measurements are to be
carried out.

4) In addition to the requirements above, suspect areas identified at previous surveys are to be overall
and close-up surveyed.

3.2.2 Cargo Holds

1) An overall survey of all cargo holds, including close-up survey of sufficient extent minimum 25 % of
frames, is to be carried out to establish the condition of:

A) Shell frames including their upper and lower end attachments, adjacent shell plating, and
transverse bulkheads in the forward cargo hold and one other selected cargo hold;
B) Areas found suspect at previous surveys.

2) Where considered necessary by the surveyor as a result of the overall and close-up survey as
described in 3.2.2.1), the survey is to be extended to include a close-up survey of all of the shell
frames and adjacent shell plating of that cargo hold as well as a close-up survey of sufficient extent
of all remaining cargo holds.

3.2.3 Extent of Thickness Measurements

1) Thickness measurements are to be carried out to an extent sufficient to determine both general
and local corrosion levels at areas subject to close-up survey as described in 3.2.2.1). The minimum
requirement for thickness measurements at the Intermediate Survey are areas found to be Suspect
Areas at previous surveys.

2) The extent of thickness measurement may be specially considered provided the Surveyor is satisfied
by the close-up survey, that there is no structural diminution and the hard-protective coatings are
found to be in a GOOD condition.

3) Where Substantial Corrosion is found, the extent of thickness measurements is to increase in

accordance with the requirements of Annex B.5. These extended thickness measurements are to be
carried out before the survey is credited as completed. Suspect Areas identified at previous surveys
are to be examined. Areas of substantial corrosion identified at previous surveys are to have thickness
measurements taken.

For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas may
be:

A) protected by coating applied in accordance with the coating manufacturer’s requirements

and examined at annual intervals to confirm the coating in way is still in good condition, or
alternatively
B) required to be measured at annual intervals.

4) Where the hard-protective coating in cargo holds, is found to be in GOOD condition, the extent of
close-up surveys and thickness measurements may be specially considered.

Explanatory note:
For existing bulk carriers, where owners may elect to coat or recoat cargo holds as noted above,
consideration may be given to the extent of the close-up and thickness measurement surveys. Prior to the
coating of cargo holds of existing ships, scantlings should be ascertained in the presence of a surveyor.

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3.3 Bulk Carriers 10 - 15 years of age. The following is to apply:

3.3.1 The requirements of the Intermediate Survey are to be to the same extent to the previous Class
Renewal Survey as required in 4. and A.8. However, internal examination of fuel tanks and pressure testing
of all tanks are not required unless deemed necessary by the attending surveyor.
3.3.2 In application of 3.3.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.3.3 In application of 3.3.1 above, an underwater survey may be considered in lieu of the requirements
of 4.2.

3.4 Bulk Carriers over 15 years of age. The following is to apply:

3.4.1 The requirements of the Intermediate Survey are to be to the same extent to the previous Class
Renewal Survey as required in 4. and A.8. However, internal examination of fuel tanks and pressure testing
of all tanks are not required unless deemed necessary by the attending surveyor.
3.4.2 In application of 3.4.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.4.3 In application of 3.4.1 above, a survey in dry dock is to be part of the intermediate survey. The
overall and close-up surveys and thickness measurements, as applicable, of the lower portions of the cargo
holds and water ballast tanks are to be carried out in accordance with the applicable requirements for
intermediate surveys, if not already performed.
Note:
Lower portions of the cargo hold and ballast tanks are considered to be the parts below light ballast water
line.

4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 All cargo tanks, Ballast Tanks, including double bottom tanks, pump rooms, pipe tunnels, cofferdams
and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this examination is to be
supplemented by thickness measurement and testing required in 4.5 and 4.6, to ensure that the structural
integrity remains effective. The aim of the examination is to discover Substantial Corrosion, significant
deformation, fractures, damages or other structural deterioration, that may be present.
4.1.4 All piping systems within the above Spaces are to be examined and operationally tested to working
pressure to attending Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory.
4.1.5 The survey extent of ballast tanks converted to void spaces is to be specially considered in relation
to the requirements for ballast tanks.

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4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo holds and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the cargo hold and ballast tanks are considered to be the parts below light ballast water
line.

4.3 Space Protection

4.3.1 Where provided, the condition of the corrosion prevention system of Ballast Tanks is to be examined.
For ballast tanks, excluding double bottom tanks, where a hard-protective coating is found to be in less than
GOOD condition and it is not renewed, or where soft or semi-hard coating has been applied, or where a
hard-protective coating has not been applied from the time of construction, the tanks in question are to be
examined at annual intervals. Thickness measurements are to be carried out as deemed necessary by the
surveyor.
When such breakdown of hard protective coating is found in water ballast double bottom tanks and it is
not renewed, where a soft or semi-hard coating has been applied, or where a hard-protective coating has
not been applied from the time of construction, the tanks in question may be examined at annual intervals.
When considered necessary by the surveyor, or where extensive corrosion exists, thickness measurements
are to be carried out.
4.3.2 Where a hard-protective coating is provided in cargo holds, and is found in GOOD condition, the
extent of close-up surveys and thickness measurements may be specially considered.

4.4 Hatch Covers and Coamings

The hatch covers and coamings are to be surveyed as follows:

4.4.1 A thorough inspection of the items listed in 2.3 is to be carried out, in addition to all hatch covers
and coamings.
4.4.2 Checking of the satisfactory operation of all mechanically operated hatch covers is to be made,
including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed condition;

— operational testing of hydraulic and power components, wires, chains, and link drives.

4.4.3 Checking the effectiveness of sealing arrangements of all hatch covers by hose testing or equivalent.
4.4.4 Close-up survey and thickness measurement (see Note 2) of the hatch cover and coaming plating
and stiffeners is to be carried out as given in Table 4-I.11 and Table 4-I.12.

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Table 4-I.10 Class Renewal Survey of Fuel Oil Tanks in The Cargo Length Area

Class Renewal Survey

Class Renewal Survey Class Renewal Survey Class Renewal Survey
No. IV
No. I No. II No. III
and Subsequent
Age ≤ 5 5 < Age ≤ 10 10 < Age ≤ 15
15 < Age
None One Two Half, minimum two
Notes:
1. These requirements apply to tanks of integral (structural) type.
2. If a selection of tanks is accepted to be examined, then different tanks are to be examined at each Class
Renewal Survey, on a rotational basis.
3. Peak tanks (all uses) are subject to internal examination at each Class Renewal Survey.
4. At Class Renewal Survey No.III and subsequent Class Renewal Surveys, one deep tank for fuel oil in the cargo
area is to be included, if fitted.

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Table 4-I.11 Minimum Requirements for Close-Up Surveys at Class Renewal Surveys of Single Skin Bulk
Carriers

Class Renewal Survey No. IV

Class Renewal Survey No. I Class Renewal Survey No. II Class Renewal Survey No. III
and Subsequent
Age ≤ 5 5 < Age ≤ 10 10 < Age ≤ 15
15 < Age
(A) All shell frames in the
forward and one other
selected cargo hold and (A) All shell frames in all cargo
(A) 25% of shell frames in
50% of frames in each of holds including upper and
the forward cargo hold (A) All shell frames in the forward
the remaining cargo holds, lower end attachments
at representative positions. cargo hold and 25% of shell
including upper and lower and adjacent shell plating.
frames in each of the
end attachments and
remaining cargo holds,
adjacent shell plating.
including upper and lower
end attachments and
(B) All transverse webs with
adjacent shell plating. For
(A) Selected frames in associated plating and Areas (B) - (E) as for Class
Bulk Carriers 100,000 DWT
remaining cargo holds. longitudinal in each water Renewal Survey No. III
and above, all shell frames in
ballast tank.
the forward cargo hold and
50% of shell frames in each of
(B) One transverse web with
the remaining cargo holds,
associated plating and
including upper and lower
longitudinal in two
end attachments and
representative water
adjacent shell plating.
ballast tanks of each
type (i.e. topside, or
hopper side tank).

(C) Two selected cargo hold

(B) One transverse web with
transverse bulkheads, (B) All transverse bulkheads in
associated plating and
including internal ballast tanks, including
longitudinal in each water
structure of upper and stiffening system
ballast tank.
lower stools, where fitted.

(D) All cargo hold hatch (B) Forward and aft transverse
Areas (C), (D) and (E) as for
covers and coamings bulkhead in one ballast tank,
Class Renewal Survey No.II
(plating and stiffeners). including stiffening system.

(C) All cargo holds transverse

bulkheads, including internal
structure of upper and lower
stools, where fitted.

(D) All cargo hold hatch covers

and coamings (plating and
stiffeners).

(E) All deck plating and under

deck structure inside line of
hatch openings between all
cargo hold hatches.
(A) Cargo hold transverse frames
(B) Transverse web frame or watertight transverse bulkhead in water ballast tanks
(C) Cargo hold transverse bulkheads plating, stiffeners and girders
(D) Cargo hold hatch covers and coamings. Subject to cargo hold hatch covers of approved design which structurally have no
access to the internals, close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.
(E) Deck plating and under deck structure inside line of hatch openings between cargo hold hatches.
See sketch in Annex B.7 for zones of side shell frames for ships subject to compliance with UR S31
Notes:
Close-up Survey of transverse bulkheads to be carried out at four levels:
Level (a) Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without
lower stool
Level (b) Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately
above the line of the shedder plates.
Level (c) About mid-height of the bulkhead.
Level (d) Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below
the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks.

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4.5 Extent of Overall and Close-up Survey

4.5.1 An Overall Survey of all tanks and spaces is to be carried out at each Class Renewal Survey. Fuel oil
tanks in the cargo length area are to be surveyed in according to Table 4-I.10.
4.5.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-I.11.
4.5.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the spaces under survey, the condition of the corrosion prevention system and where
spaces have structural arrangements or details which have suffered defects in similar spaces or on similar
ships according to available information.
4.5.4 For areas in spaces where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-I.11 may be specially considered.

4.6 Extent of Thickness Measurement

4.6.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-I.12.
For additional thickness measurement guidelines, applicable to the vertically corrugated transverse
watertight bulkhead between cargo hold No. 1 and 2 on ships subject to compliance with UR S19 and
S23, reference is to be made to 1.2.2 and Annex B.6.
For additional thickness measurement guidelines, applicable to the side shell frames and brackets on ships
subject to compliance with UR S31, reference is to be made to 1.2.3 and Annex B.7.
4.6.2 Provisions for extended measurements for areas with Substantial Corrosion are given in Annex B.5,
and as may be additionally specified in the Survey Programme as required by A.8. These extended thickness
measurements are to be carried out before the survey is credited as completed. Suspect Areas identified
at previous surveys are to be examined. Areas of substantial corrosion identified at previous surveys are to
have thickness measurements taken.
For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas may be:

1) protected by coating applied in accordance with the coating manufacturer’s requirements and
examined at annual intervals to confirm the coating in way is still in good condition, or alternatively

2) required to be measured at annual intervals.

4.6.3 The Surveyor may further extend the thickness measurements as deemed necessary.
4.6.4 For areas in tanks where hard protective coating is found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-I.12 may be specially considered.
4.6.5 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements, one of which is to be in the amidships area.
4.6.6 Representative thickness measurement to determine both general and local levels of corrosion in
the shell frames and their end attachments in all cargo holds and water ballast tanks is to be carried out.
Thickness measurement is also to be carried out to determine the corrosion levels on the transverse
bulkhead plating. The extent of thickness measurements may be specially considered provided the Surveyor
is satisfied by the close-up survey, that there is no structural diminution, and the hard-protective coating
where applied remains efficient.

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Table 4-I.12 Minimum Requirements for Thickness Measurement at Class Renewal Surveys of Single
Skin Bulk Carriers

Class Renewal Survey

Class Renewal Survey Class Renewal Survey Class Renewal Survey
No. IV
No. I No. II No. III
and Subsequent
Age ≤ 5 5 < Age ≤ 10 10 < Age ≤ 15
15 < Age
Suspect areas Suspect areas Suspect areas Suspect areas
Within the cargo length: Within the cargo length:
- each deck plate - each deck plate
outside line of cargo outside line of cargo
Within the cargo length: hatch openings hatch openings
Two transverse sections of - two transverse - three transverse
deck plating outside line of sections, one in the sections, one in the
cargo hatch openings amidship area, amidship area,
outside line of cargo outside line of cargo
hatch openings hatch openings
- all wind and water strakes - each bottom plate
Wind and water strakes in Selected wind and water
All wind and water
way of the two transverse strakes outside the cargo
strakes, full length
sections considered above length area

Selected wind and water

strakes outside the cargo
length area
Measurements, for Measurements, for
Measurements, for general
general assessment and general assessment and
assessment and recording of
recording of corrosion recording of corrosion
corrosion pattern, of those
pattern, of those pattern, of those
structural members subject
structural members structural members
to close-up survey according
subject to close-up survey subject to close-up survey
to Table 4-I.11
according to Table 4-I.11 according to Table 4-I.11
See 1.2.2 and Annex B.6 See 1.2.2 and Annex B.6
for additional thickness for additional thickness
measurement guidelines measurement guidelines
applicable to the vertically applicable to the vertically
corrugated transverse corrugated transverse
water-tight bulkhead water-tight bulkhead
between cargo hold No.1 between cargo hold No.1
and 2 on ships subject to and 2 on ships subject to
compliance with URs S19 compliance with URs S19
and S23. and S23.
See 1.2.3 and Annex B.7 for See 1.2.3 and Annex B.7 See 1.2.3 and Annex B.7
Additional thickness for additional thickness for additional thickness
measurement guidelines measurement guidelines measurement guidelines
applicable to the side shell applicable to the side shell applicable to the side
frames and brackets on frames and brackets on shell frames and brackets
ships subject to compliance ships subject to on ships subject to
with UR S31. compliance with UR S31. compliance with UR S31.

4.7 Extent of Tank testing

4.7.1 All boundaries of water ballast tanks, deep tanks and cargo holds used for water ballast within the
cargo length area are to be pressure tested. For Fuel Oil Tanks, only representative tanks are to be pressure
tested.
4.7.2 The Surveyor may extend the tank testing as deemed necessary
4.7.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
4.7.4 Boundaries of ballast holds are to be tested with a head of liquid to near to the top of hatches.

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4.7.5 Boundaries of fuel oil tanks are to be tested with a head of liquid to the highest point that liquid
will rise under service conditions. Tank testing of fuel oil tanks may be specially considered based on a
satisfactory external examination of the tank boundaries, and a confirmation from the Master stating that
the pressure testing has been carried out according to the requirements with satisfactory results.
4.7.6 The testing of double bottom tanks and other spaces not designed for the carriage of liquid may
be omitted, provided a satisfactory internal examination together with an examination of the tank top is
carried out.

4.8 Additional Class Renewal Survey requirements after determining compliance with SOLAS XII/12 and
XII/13
4.8.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry space water level
detectors, the Class Renewal Survey is to include an examination and a test of the water ingress detection
systems and of their alarms.
4.8.2 For ships complying with the requirements of SOLAS XII/13 for the availability of pumping systems,
the Class Renewal Survey is to include an examination and a test of the means for draining and pumping
ballast tanks forward of the collision bulkhead and bilges of dry spaces any part of which extends forward
of the foremost cargo hold, and of their controls.

F. Double skin Bulk Carriers

1. General Requirements
1.1 Application
1.1.1 The following requirements apply to all self-propelled Double skin Bulk carriers of 500 gross tonnage
and above with qualifier notation ESP.
1.1.2 The requirements apply to surveys of hull structure and piping systems in way of cargo holds,
cofferdams, pipe tunnels, void spaces and fuel oil tanks within the cargo area, and to all ballast tanks.
1.1.3 Unless otherwise stipulated in the following, the requirements of Section 3 apply.

1.2 Extent of surveys

1.2.1 The requirements contain the minimum extent of examination, thickness measurement and tank
testing. The surveys are to be extended where substantial corrosion and/or structural defects are found,
and will include an additional Close-Up Survey when necessary.
1.2.2 For bulk carriers with hybrid cargo hold arrangements, e.g. with some cargo holds of single side skin
and others of double side skin, the requirements of E. are to apply to cargo holds of single side skin.

2. Annual surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that
the hull, weather decks, hatch covers, coamings and piping are maintained in a satisfactory condition and
should take into account the service history, condition and extent of the corrosion prevention system of
ballast tanks and areas identified in the survey report file.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.
— Examination of watertight penetrations as far as practicable.

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2.3 Examination of weather deck, hatch covers and coamings

2.3.1 Confirmation is to be obtained that no unapproved changes have been made to the hatch covers,
hatch coamings and their securing and sealing devices since the last survey.
2.3.2 A thorough survey of cargo hatch covers, and coamings is only possible by examination in the open
as well as closed positions and should include verification of proper opening and closing operation. As a
result, at least the hatch cover sets within the forward 25 % of the ships length and at least one additional
set, such that all the sets on the ship are assessed at least once in every five-year period, should be surveyed
open, closed and in operation to the full extent in each direction at each Annual Survey, including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed condition; and

— operational testing of hydraulic and power components, wires, chains and link drives

The closing of covers should include the fastening of all peripheral, and cross joint cleats or other securing
devices. Particular attention should be paid to the condition of hatch covers in the forward 25 % of the
ships length, where the sea loads are normally greatest.
2.3.3 If there are indications of difficulty in operation and securing hatch covers, additional sets above
those required in 2.3.2, at the discretion of the surveyor, should be tested in operation.
2.3.4 Where the cargo hatch securing system does not function properly, repairs should be carried out
under the supervision of the BKI’s surveyor. Where hatch covers or coamings undergo substantial repairs,
the strength of securing devices should be upgraded to comply with Annex 11 of IMO Resolution MSC 261
(84) as amended or Rules for Hull (Pt.1, Vol.II) Sec.17.B.5.
2.3.5 For each cargo hatch cover set, at each Annual Survey, the following items should be surveyed:

— cover panels, including side plates, and stiffener attachments that may be accessible in the open
position by Close-Up Survey (for corrosion, cracks, deformation);

— sealing arrangements of perimeter and cross joints (gaskets for condition and permanent
deformation, flexible seals on combination carriers, gasket lips, compression bars, drainage channels
and non-return valves);

— clamping devices, retaining bars, cleating (for wastage, adjustment, and condition of rubber
components);

— closed cover locating devices (for distortion and attachment);

— chain or rope pulleys;

— guides;

— guide rails and track wheels;

— stoppers;

— wires, chains, tensioners and gypsies;

— hydraulic system, electrical safety devices and interlocks; and

— end and interpanel hinges, pins and stools where fitted.

2.3.6 At each hatchway, at each Annual Survey, the coamings, with plating, stiffeners and brackets should
be checked for corrosion, cracks and deformation, especially of the coaming tops, including close-up survey.
2.3.7 Where considered necessary, the effectiveness of sealing arrangements may be proved by hose or
chalk testing supplemented by dimensional measurements of seal compressing components.

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2.3.8 Where portable covers, wooden or steel pontoons are fitted, the satisfactory condition of the
following should be confirmed:

— wooden covers and portable beams, carriers or sockets for the portable beam, and their securing
devices;

— steel pontoons, including close-up survey of hatch cover plating;

— tarpaulins;

— cleats, battens, and wedges;

— hatch securing bars and their securing devices;

— loading pads/bars and the side plate edge;

— guides plates and chocks;

— compression bars; drainage channels and drain pipes (if any).

2.3.9 Examination of flame screens on vents to all bunker tanks.

2.3.10 Examination of bunker and vent piping systems, including ventilators.

2.4 Examination of Cargo holds

2.4.1 Double skin Bulk Carriers 10-15 years of age, the following is to apply:
1) Overall Survey of two selected cargo holds.

2) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance
with Annex B.5. These thickness measurements are to be carried out before the annual survey is
credited as completed. Suspect Areas identified at previous surveys are to be examined. Areas of
substantial corrosion identified at previous surveys are to have thickness measurements taken.

For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be
omitted where a protective coating has been applied in accordance with the coating manufacturer’s
requirements and is maintained in good condition.

3) All piping and penetrations in cargo holds, including overboard piping, are to be examined.

2.4.2 Double skin Bulk Carriers over 15 years of age, the following is to apply:
1) Overall Survey of all cargo holds.

2) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, the extent of thickness measurements is to be increased in accordance
with Annex B.5. These thickness measurements are to be carried out before the annual survey is
credited as completed. Suspect Areas identified at previous surveys are to be examined. Areas of
substantial corrosion identified at previous surveys are to have thickness measurements taken.

For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be
omitted where a protective coating has been applied in accordance with the coating manufacturer’s
requirements and is maintained in good condition.

3) All piping and penetrations in cargo holds, including overboard piping, are to be examined.

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2.5 Examination of Ballast tanks

2.5.1 Examination of Ballast Tanks when required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out. When considered necessary by the surveyor, or where
extensive corrosion exists, thickness measurements are to be carried out. If the results of these thickness
measurements indicate that Substantial Corrosion is found, the extent of thickness measurements is to
be increased in accordance with Annex B.5. These extended thickness measurements are to be carried out
before the survey is credited as completed. Suspect Areas identified at previous surveys are to be examined.
Areas of substantial corrosion identified at previous survey are to have thickness measurements taken.
For vessels built under the IACS Common Structural Rules, the annual thickness gauging may be omitted
where a protective coating has been applied in accordance with the coating manufacturer’s requirements
and is maintained in good condition.

2.6 Additional Annual survey requirements after determining compliance with SOLAS XII/12 and XII/13
2.6.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry space water
level detectors, the annual survey is to include an examination and a test, at random, of the water ingress
detection systems and of their alarms.
2.6.2 For ships complying with the requirements of SOLAS XII/13 for the availability of pumping systems,
the annual survey is to include an examination and a test, of the means for draining and pumping ballast
tanks forward of the collision bulkhead and bilges of dry spaces any part of which extends forward of the
foremost cargo hold, and of their controls.

2.7 Examination of double-side skin void spaces for bulk carriers exceeding 20 years of age and of 150
m in length and upwards

Examination of double-side skin void spaces, for bulk carriers exceeding 20 years of age and of 150 m in
length and upwards, are to be carried out when required as a consequence of the results of the renewal
survey (as required by para 4.3.3 and intermediate survey (as required by 3.3.1. When considered necessary
by the Administration, or when extensive corrosion exists, thickness measurements should be carried out.
If the results of these thickness measurements indicate that substantial corrosion is found, the extent of
thickness measurements should be increased in accordance with Annex B.5.4. These extended thickness
measurements should be carried out before the survey is credited as completed. Suspect areas identified at
previous surveys should be examined. Areas of substantial corrosion identified at previous surveys should
have thickness measurements taken.

3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.

3.2 Double skin Bulk carriers 5 - 10 years of age. The following is to apply:
3.2.1 Ballast Tanks
1) For tanks used for water ballast, an overall survey of representative spaces selected by the Surveyor
is to be carried out. The selection is to include fore and aft peak tanks and a number of other tanks,
taking into account the total number and type of ballast tanks. If such overall survey reveals no
visible structural defects, the examination may be limited to verification that the corrosion prevention
system remains efficient.

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2) Where POOR coating condition, corrosion or other defects are found in water Ballast tanks or where
a hard-Protective Coating was not applied from the time of construction, the examination is to be
extended to other Ballast tanks of the same type.

3) In ballast tanks other than double bottom tanks, where a hard-Protective Coating is found in POOR
condition, and it is not renewed, or where soft or semi-hard coating has been applied, or where a
hard-protective coating was not applied from the time of construction, the tanks in question are to
be examined and thickness measurements carried out as considered necessary at annual intervals.
When such breakdown of hard protective coating is found in ballast double bottom tanks, or where a
soft or semi-hard coating has been applied, or where a hard-protective coating has not been applied,
the tanks in question may be examined at annual intervals. When considered necessary by the
Surveyor, or where extensive corrosion exists, thickness measurements are to be carried out.

4) In addition to the requirements above, suspect areas identified at previous surveys are to be overall
and close-up surveyed.

3.2.2 Cargo Holds

1) An overall survey of all cargo holds.

2) Where considered necessary by the surveyor as a result of the overall survey as described in 1), the
survey is to be extended to include a close-up survey of those areas of structure in the cargo holds
selected by the Surveyor.

3.2.3 Extent of Thickness Measurements

1) Thickness measurements are to be carried out to an extent sufficient to determine both general and
local corrosion levels at areas subject to close-up survey as described in 3.2.2.1) and as provided in
3.2.1.3).

2) The extent of thickness measurement may be specially considered provided the Surveyor is satisfied
by the close-up survey, that there is no structural diminution and the hard-protective coatings are
found to be in a GOOD condition.

3) Where Substantial Corrosion is found, the extent of thickness measurements is to increase in

accordance with the requirements of Annex B.5. These extended thickness measurements are to be
carried out before the survey is credited as completed. Suspect Areas identified at previous surveys
are to be examined. Areas of substantial corrosion identified at previous surveys are to have thickness
measurements taken.

For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas may
be:

A) protected by coating applied in accordance with the coating manufacturer’s requirements

and examined at annual intervals to confirm the coating in way is still in good condition, or
alternatively
B) required to be measured at annual intervals.

4) Where the hard-protective coating in cargo holds, is found to be in GOOD condition, the extent of
close-up surveys and thickness measurements may be specially considered.

Note:
For existing bulk carriers, where owners may elect to coat or recoat cargo holds as noted above,
consideration may be given to the extent of the close-up and thickness measurement surveys. Prior to the
coating of cargo holds of existing ships, scantlings should be ascertained in the presence of a surveyor.

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3.3 Double skin Bulk Carriers 10 - 15 years of age. The following is to apply:
3.3.1 The requirements of the Intermediate Survey are to be to the same extent to the previous Class
Renewal Survey as required in 4. and A.8. However, internal examination of fuel tanks and pressure testing
of all tanks are not required unless deemed necessary by the attending surveyor.
3.3.2 In application of 3.3.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.3.3 In application of 3.3.1 above, an underwater survey may be considered in lieu of the requirements
of 4.2.

3.4 Double skin Bulk Carriers over 15 years of age. The following is to apply:
3.4.1 The requirements of the Intermediate Survey are to be to the same extent to the previous Class
Renewal Survey as required in 4. and A.8. However, internal examination of fuel tanks and pressure testing
of all tanks are not required unless deemed necessary by the attending surveyor.
3.4.2 In application of 3.4.1 above, the Intermediate survey may be commenced at the second annual
survey and be progressed during the succeeding year with a view to completion at the third annual survey
in lieu of the application of Section 3, B.1.3.1.7).
3.4.3 In application of 3.4.1 above, a survey in dry dock is to be part of the intermediate survey. The
overall and close-up surveys and thickness measurements, as applicable, of the lower portions of the cargo
holds and water ballast tanks are to be carried out in accordance with the applicable requirements for
intermediate surveys, if not already performed.
Note:
Lower portions of the cargo hold and ballast tanks are considered to be the parts below light ballast water
line.

4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 All cargo tanks, Ballast Tanks, including double bottom tanks, pump rooms, pipe tunnels, cofferdams
and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this examination is to be
supplemented by thickness measurement and testing required in 4.5 and 4.6, to ensure that the structural
integrity remains effective. The aim of the examination is to discover Substantial Corrosion, significant
deformation, fractures, damages or other structural deterioration, that may be present.
4.1.4 All piping systems within the above Spaces are to be examined and operationally tested to working
pressure to attending Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory.
4.1.5 The survey extent of ballast tanks converted to void spaces is to be specially considered in relation
to the requirements for ballast tanks.

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4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo holds and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.

4.3 Space Protection

4.3.1 Where provided, the condition of the corrosion prevention system of Ballast Tanks is to be examined.
For ballast tanks, excluding double bottom tanks, where a hard-protective coating is found to be in less than
GOOD condition and it is not renewed, or where soft or semi-hard coating has been applied, or where a
hard-protective coating has not been applied from the time of construction, the tanks in question are to be
examined at annual intervals. Thickness measurements are to be carried out as deemed necessary by the
surveyor.
When such breakdown of hard protective coating is found in water ballast double bottom tanks and it is
not renewed, where a soft or semi-hard coating has been applied, or where a hard-protective coating has
not been applied from the time of construction, the tanks in question may be examined at annual intervals.
When considered necessary by the surveyor, or where extensive corrosion exists, thickness measurements
are to be carried out.
4.3.2 Where a hard-protective coating is provided in cargo holds, and is found in GOOD condition, the
extent of close-up surveys and thickness measurements may be specially considered.
4.3.3 For double-side skin void spaces bounding cargo holds for bulk carriers exceeding 20 years of age
and of 150 m in length and upwards, where provided, the condition of the corrosion prevention system of
void spaces shall be examined. Where a hard protective coating is found to be in POOR condition, and it is
not renewed, or where a soft or semi-hard coating has been applied, or where a hard protective coating has
not been applied from the time of construction, the void spaces in question shall be examined at annual
intervals. Thickness measurements shall be carried out as deemed necessary by the surveyor.

4.4 Hatch Covers and Coamings

The hatch covers and coamings are to be surveyed as follows:

4.4.1 A thorough inspection of the items listed in 2.3 is to be carried out, in addition to all hatch covers
and coamings.
4.4.2 Checking of the satisfactory operation of all mechanically operated hatch covers is to be made,
including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed condition;

— operational testing of hydraulic and power components, wires, chains, and link drives.

4.4.3 Checking the effectiveness of sealing arrangements of all hatch covers by hose testing or equivalent.
4.4.4 Close-up survey and thickness measurement (see Note 2) of the hatch cover and coaming plating
and stiffeners is to be carried out as given in Table 4-I.14 and Table 4-I.15.

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4.5 Extent of Overall and Close-up Survey

4.5.1 An Overall Survey of all tanks and spaces is to be carried out at each Class Renewal Survey. Fuel oil
tanks in the cargo length area are to be surveyed as follows:

Table 4-I.13 Class Renewal Survey of Fuel Oil Tanks in the Cargo Length Area

Class Renewal Survey

Class Renewal Survey Class Renewal Survey Class Renewal Survey
No. IV
No. I No. II No. III
and Subsequent
Age ≤ 5 5 < Age ≤ 10 10 < Age ≤ 15
15 < Age
None One Two Half, minimum two
Notes:
1. These requirements apply to tanks of integral (structural) type.
2. If a selection of tanks is accepted to be examined, then different tanks are to be examined at each Class
Renewal Survey, on a rotational basis.
3. Peak tanks (all uses) are subject to internal examination at each Class Renewal Survey.
4. At Class Renewal Survey No. III and subsequent Class Renewal Surveys, one deep tank for fuel oil in the cargo
area is to be included, if fitted.

4.5.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-I.14.
4.5.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the spaces under survey, the condition of the corrosion prevention system and where
spaces have structural arrangements or details which have suffered defects in similar spaces or on similar
ships according to available information.
4.5.4 For areas in spaces where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-I.14 may be specially considered.

4.6 Extent of Thickness Measurement

4.6.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-I.13.
4.6.2 Provisions for extended measurements for areas with Substantial Corrosion are given in Annex B.5,
and as may be additionally specified in the Survey Programme as required by A.8. These extended thickness
measurements are to be carried out before the survey is credited as completed. Suspect Areas identified
at previous surveys are to be examined. Areas of substantial corrosion identified at previous surveys are to
have thickness measurements taken.
For vessels built under IACS Common Structural Rules, the identified substantial corrosion areas may be:

1) protected by coating applied in accordance with the coating manufacturer’s requirements and
examined at annual intervals to confirm the coating in way is still in good condition, or alternatively

2) required to be measured at annual intervals.

4.6.3 The Surveyor may further extend the thickness measurements as deemed necessary.
4.6.4 For areas in tanks where hard protective coating are found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-I.15 may be specially considered.
Note 2:
Subject to cargo hold hatch covers of approved design which structurally have no access to the internals,
close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.
4.6.5 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements, one of which is to be in the amidships area.

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4.6.6 Representative thickness measurement to determine both general and local levels of corrosion
in the shell frames and their end attachments in all cargo holds and water ballast tanks is to be carried
out. Thickness measurement is also to be carried out to determine the corrosion levels on the transverse
bulkhead plating. The extent of thickness measurements may be specially considered provided the Surveyor
is satisfied by the close-up survey, that there is no structural diminution, and the hard-protective coating
where applied remains efficient.

4.7 Extent of Tank testing

4.7.1 All boundaries of water ballast tanks, deep tanks and cargo holds used for water ballast within the
cargo length area are to be pressure tested. For Fuel Oil Tanks, only representative tanks are to be pressure
tested.
4.7.2 The Surveyor may extend the tank testing as deemed necessary
4.7.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
4.7.4 Boundaries of ballast holds are to be tested with a head of liquid to near to the top of hatches.
4.7.5 Boundaries of fuel oil tanks are to be tested with a head of liquid to the highest point that liquid
will rise under service conditions. Tank testing of fuel oil tanks may be specially considered based on a
satisfactory external examination of the tank boundaries, and a confirmation from the Master stating that
the pressure testing has been carried out according to the requirements with satisfactory results.
4.7.6 The testing of double bottom tanks and other spaces not designed for the carriage of liquid may
be omitted, provided a satisfactory internal examination together with an examination of the tank top is
carried out.

4.8 Additional Class Renewal Survey requirements after determining compliance with SOLAS XII/12 and
XII/13
4.8.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry space water level
detectors, the Class Renewal Survey is to include an examination and a test of the water ingress detection
systems and of their alarms.
4.8.2 For ships complying with the requirements of SOLAS XII/13 for the availability of pumping systems,
the Class Renewal Survey is to include an examination and a test of the means for draining and pumping
ballast tanks forward of the collision bulkhead and bilges of dry spaces any part of which extends forward
of the foremost cargo hold, and of their controls.

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Table 4-I.14-1 Class Renewal Survey of Double Skin Bulk Carriers, excluding Ore Carriers Minimum
Requirements for Close-Up Surveys

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
One transverse web with
associated plating and
longitudinal in two One transverse web with
All transverse webs with associated plating and
representative ballast tanks associated plating and
longitudinal as applicable in each water ballast
of each type. (This is to longitudinal as applicable in each
tank1
include the foremost topside ballast tank1
and double side ballast tank
on either side)1
Forward and aft transverse
Two selected cargo hold bulkheads including stiffening
transverse bulkheads, system in a transverse section
All transverse bulkheads including stiffening
including internal structure including topside, hopper side
system in each water ballast tank1
of upper and lower stools, and double side ballast tanks on
where fitted3 one side of the ship (i.e. port or
starboard)1
25% of ordinary
transverse web All ordinary transverse
frames, for transverse web frames for
25% of ordinary transverse web
framing system or transverse framing
frames, for transverse framing
25% of longitudinals system or all of
system or 25% of longitudinals
for longitudinal longitudinals for
for longitudinal framing system
framing system on longitudinal framing
on side shell and inner side
side shell and inner system on side shell
plating at forward, middle and
side plating at and inner side plating at
aft parts, in the fore-most
forward, middle and forward, middle and aft
double side tanks2
aft parts, in the parts, in all double side
foremost double side tanks2
tanks2
One transverse bulkhead in each
All cargo hold transverse bulkheads, including
cargo hold including internal
internal structure of upper and lower stools,
structure of upper and lower
where fitted3
stool, where fitted3
All cargo hold hatch covers and coamings (platings and stiffeners)4
All deck plating and under deck structure inside line of hatch openings between all
cargo hold hatches5
1-5
are areas to be subjected to Close-Up Surveys and thickness measurements
1
Trans verse web frame or watertight transverse bulkhead in topside, hopper side, double side and double bottom ballast
tank, in fore and aft peak tanks. Transverse web frame means a complete transverse web frame ring including
adjacent structural members.
2
Ordinary transverse frames in double side tanks.
3
Cargo hold transverse bulkheads plating, stiffeners and girders.
4
Cargo hold hatch covers and coamings. Subject to cargo hold hatch covers of approved design which structurally have no
access to the internals, close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.
5
Deck plating ins ide line of hatch openings between cargo hold hatches.
Notes:
Close-Up Survey of transverse bulkheads to be carried out at four levels:
– Level (a): immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships
without lower stool
– Level (b): immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and
immediately above the line of the shedder plates
– Level (c): about mid-height of the bulkhead
– Level (d): immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately
below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks

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Table 4-I.14-2 Class Renewal Survey of Double Skin Bulk Carriers (Ore Carriers) Minimum Requirements
for Close-Up Surveys

Class Renewal Survey [No.] and ship’s age [years]

IV. and subsequent,
I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15
age > 15
One web frame ring
All web frame rings comp-
complete including
lete including adjacent All web frame rings complete including adjacent
adjacent structural
structural members in a structural members in each ballast tank1
members in a ballast wing
ballast wing tank1
tank.1

One deck transverse

including adjacent deck
structural members in
each remaining ballast
tank1
Forward and aft
transverse bulkheads
including girder system One web frame ring complete including adjacent
and adjacent structural structural members in each wing void space.1
members in a ballast wing
tank1

Additional web frame rings in void spaces as deemed

necessary by Surveyor1
One transverse bulkhead One transverse bulkhead
lower part including lower part including girder
girder system and system and adjacent All transverse bulkheads including girder system and
adjacent structural structural members in adjacent structural members in each ballast tank1
members in a ballast each remaining ballast
tank1 tank1
Two selected cargo hold One transverse bulkhead
transverse bulkheads, in each cargo hold,
including internal including internal All cargo hold transverse bulkheads, including internal
structure of upper and structure of upper and structure of upper and lower stools, where fitted3
lower stools, where lower stools, where fitted
fitted3 3

All cargo hold hatch covers and coamings (platings and stiffeners)4
All deck plating and under deck structure inside line of hatch openings between all
cargo hold hatches5
1–5
are areas to be subjected to Close-Up Surveys and thickness measurements
1
Transverse web frame or watertight transverse bulkhead in ballast wing tanks and void spaces.
2
In fore and aft peak tanks transverse web frame means a complete transverse web frame ring including adjacent
structural members.
3
Cargo hold transverse bulkheads plating, stiffeners and girders
4
Cargo hold hatch covers and coamings
5
Deck plating and under deck structure ins ide line of hatch openings between cargo hold hatches

Note:
Close-Up Survey of transverse bulkheads to be carried out at four levels:
– Level (a): immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships
without lower stool
– Level (b): immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately
above the line of the shedder plates
– Level (c): about mid-height of the bulkhead
– Level (d): immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately
below the upper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks

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Table 4-I.15 Class Renewal Surveys of Double Skin Bulk Carriers Minimum Requirements for Thickness
Measurements

Class Renewal Survey [No.] and ship’s age [years]

I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15 IV. and subsequent, age > 15
Within the cargo area:
Within the cargo area:
– each deck plate outside
– each deck plate
Within the cargo area: line of cargo hatch
outside line of cargo
two transverse sections openings
hatch openings
of deck plating outside – 3 transverse sections,
– 2 transverse sections,
line of cargo hatch one in amidship area,
one in amidship area,
openings outside line of cargo
outside line of cargo
hatch openings
hatch openings
- each bottom plate
Wind and water strakes
All wind and water
in way of the two
strakes within the cargo All wind and water strakes
transverse sections
length area full length
indicated above
Selected wind and water strakes outside the cargo
length area
Measurement, for general assessment and recording of corrosion pattern, of the
structural members subject to close-up survey according to Table 4.-I.14-1 or 4-I.14-2

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II. Additional Requirements for Ships Not Subject to ESP Notation

A. Liquefied Gas Carrier
1. General requirements
1.1 Application
1.1.1 In addition to the requirements specified in Section 3, the requirements in this section apply to
Liquefied Gas carriers as defined in the Rules for Ships Carrying Liquefied Gasses in Bulk (Pt.1, Vol.IX).
1.1.2 The following requirements apply to surveys of hull structure and piping systems except piping of
cargo installation covered under 2.7, 3.3 and 4.7, in way of pump rooms, compressor rooms, cofferdams,
pipe tunnels, void spaces and fuel oil tanks within the cargo area, and all ballast tanks.
1.1.3 Unless otherwise stipulated in the following, the requirements in Section 3 apply. However, if the
duplicated survey items are exist, these are not to be applied twice.

1.2 Extent of surveys

1.2.1 The requirements contain the minimum extent of examination, thickness measurement and tank
testing. The surveys are to be extended where substantial corrosion and/or structural defects are found
and will include an additional Close-Up Survey when necessary.

2. Annual Surveys
2.1 General
2.1.1 The schedule of Annual Surveys is to be in accordance with the requirements of Section 3, B.1.1.1.
2.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull and piping are maintained in a satisfactory condition.

2.2 Examination of the hull

— Examination of the hull plating and its closing appliances as far as can be seen.

— Examination of watertight penetrations as far as practicable.

2.3 Examination of weather deck

— Examination of flame screens on vents to all bunker tanks.

— Examination of bunker and vent piping systems.

2.4 Examination of cargo pump rooms and compressor rooms and, as far as practicable, pipe tunnels if
fitted.
— Examination of all pump room and compressor room bulkheads for signs of leakage or fractures
and, in particular, the sealing arrangements of all penetrations of pump room and compressor room
bulkheads.

— Examination of the condition of all piping systems, except those covered by 2.7.

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2.5 Suspect Areas

2.5.1 Suspect Areas identified at previous surveys are to be examined. Thickness measurements are to
be taken of the areas of substantial corrosion and the extent of thickness measurements is to be increased
to determine the extent of areas of substantial corrosion.
Table 4-II.6 may be used as guidance for these additional thickness measurements. These extended
thickness measurements are to be carried out before the annual survey is credited as completed.

2.6 Examination of Ballast tanks

2.6.1 Examination of ballast tanks when required as a consequence of the results of the Class Renewal
Survey and Intermediate Survey is to be carried out. When considered necessary by the surveyor, or where
extensive corrosion exists, thickness measurement is to be carried out. If the results of these thickness
measurements indicate that Substantial Corrosion is found, then the extent of thickness measurements
are to be increased to determine the extent of areas of substantial corrosion.
Table 4-II.6 may be used as guidance for these additional measurements. These extended thickness
measurements are to be carried out before the annual survey is credited as completed.

2.7 Surveys of Cargo Installation

2.7.1 General
1) The log books are to be examined with regard to correct functioning of the cargo containment and
cargo handling systems. The hours per day of the reliquefication plants or the boil-off rate is to be
considered.

2) All accessible gas-tight bulkhead penetrations including gas-tight shaft sealings are to be visually
examined.

3) The means for accomplishing gas tightness of the wheelhouse doors and windows is to be examined.
All windows and side scuttles within the area required to be of the fixed type (non-opening) are to be
examined for gas tightness. The closing devices for all air intakes and openings into accommodation
spaces, service spaces, machinery spaces, control stations and approved openings in superstructures
and deckhouses facing the cargo area or bow and stern loading/unloading arrangements, are to be
examined.

2.7.2 Cargo handling systems

The cargo handling piping and machinery, e.g. cargo and process piping, cargo heat exchangers, vaporizers,
pumps, compressors and cargo hoses are in general to be visually examined, as far as possible, during
operation.

2.7.3 Cargo containment venting systems

Venting systems, including protection screens if provided, for the cargo tanks, interbarrrier spaces and hold
spaces are to be visually examined externally. It is to be verified that the cargo tank relief valves are sealed
and that the certificate for the relief valves opening/closing pressures is onboard.

2.7.4 Instrumentation and safety systems

1) The instrumentation of the cargo installations with regard to pressure, temperature and liquid level
is to be verified in good working order by one or more of the following methods:

— Visual external examination;

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— Comparing of read outs from different indicators;

— Consideration of read outs with regard to the actual cargo and/or actual conditions;
— Examination of maintenance records with reference to cargo plant instrumentation
maintenance manual;
— Verification of calibration status of the measuring instruments.

2) The logbooks are to be examined for confirmation that the emergency shutdown system has been
tested.

2.7.5 Environmental control for cargo containment systems

1) Inert gas/dry air installations including the means for prevention of backflow of cargo vapour to
gas-safe spaces are to be verified as being in satisfactory operating condition.

2) For membrane containment systems normal operation of the nitrogen control system for insulation
and interbarrier spaces shall be confirmed to the Surveyor by the Master.

2.7.6 Miscellaneous
1) It is to be verified that all accessible cargo piping systems are electrically bonded to the hull.

2) Arrangements for burning methane boil-off are to be visually examined as far as practicable. The
instrumentation and safety systems are to be verified as being in good working order in accordance
with 2.7.4.1).

3) The relevant instruction and information material such as cargo handling plans, filling limit
information, cooling down procedures, etc. are to be verified as being onboard.

4) Mechanical ventilation fans in gas dangerous spaces and zones are to be visually examined.

3. Intermediate Surveys
3.1 General
3.1.1 The schedule of Intermediate Surveys is to be in accordance with the requirements of Section 3,
B.1.2.1.

3.2 Ballast tanks

3.2.1 For ships between 5 and 10 years of age, an overall survey of representative ballast tanks is to be
carried out. If there is no hard-protective coating, soft or semi-hard coating or POOR coating condition, the
examination is to be extended to other ballast tanks of the same type.
3.2.2 For ships over 10 years of age, an overall survey of all ballast tanks is to be carried out.
3.2.3 If such examinations reveal no visible structural defects, the examination may be limited to a
verification that the corrosion prevention system remains efficient.
3.2.4 For ballast tanks, excluding double bottom tanks, if there is no hard protective coating, soft or
semi-hard coating, or POOR coating condition and it is not renewed, the tanks in question are to be
internally examined at annual intervals.
3.2.5 When such conditions are found in double bottom ballast tanks, the tanks in question may be
internally examined at annual intervals.

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3.2.6 The minimum requirements for close-up surveys at intermediate survey are given in Table 4-II.1.

Table 4-II.1 Intermediate Surveys (Hull) of Liquefied Gas Carriers Minimum Requirements for Close-Up
Surveys

10 < age ≤ 15 age > 15

Close-Up Survey of: Close-Up Survey of:
– all web frames and both transverse bulkheads in a – all web frames and both transverse bulkheads in two
representative ballast tank1,2 representative ballast tanks1,2
– the upper part of one web frame in another
representative ballast tank
– one transverse bulkhead in another representative ballast
tank2
1 Complete transverse web frame including adjacent structural members.
2 Transverse bulkhead complete, including girder system and adjacent members, and adjacent
longitudinal bulkhead structure.
Notes :
1. Ballast tanks include topside, double hull side, double bottom, hopper side, or any combined arrangement of the
aforementioned, and peak tanks where fitted.
2. For areas in tanks where protective coating is found to be in good condition, the extent of Close-Up Survey may be specially
considered by BKI.
3. For ships having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of
Close-Up Surveys may be specially considered by BKI.
4. The extent of Close-Up Surveys may be extended by the Surveyor as deemed necessary, taking into account the maintenance
of the tanks under survey, the condition of the corrosion prevention system and also in the following cases:
– in particular, in tanks having structural arrangements or details which have suffered defects in similar tanks, or on similar
ships according to available information;
– in tanks having structures approved with reduced scantlings.

3.3 Surveys of Cargo Installation

3.3.1 General

The requirements of 2.7 apply with the following additions:

3.3.2 Instrumentation and safety systems

1) The instrumentation of the cargo installation with regard to pressure, temperature and liquid level
is to be visually examined and to be tested by changing the pressure, temperature and level as
applicable and comparing with test instruments. Simulated testing may be accepted for sensors
which are not accessible or for sensors located within cargo tanks or inerted hold spaces. The testing
is to include testing of alarm and safety functions.

2) The piping of the gas detection system is to be visually inspected for corrosion and damage as far
as practicable. The integrity of the suction lines between suction points and analyzing units is to be
verified as far as possible. Gas Detectors are to be calibrated or verified with sample gases.

3) The emergency shutdown system is to be tested, without flow in the pipe lines, to verify that the
system will cause the cargo pumps and compressors to stop.

3.3.3 Electrical equipment

Electrical equipment in gas-dangerous spaces and zones is to be examined as far as practicable with
particular respect to the following:

— Protective earthing (Spot check).

— Integrity of enclosures.

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— Damage of outer sheath of cables.

— Function testing of pressurized equipment and of associated alarms.
— Testing of systems for de-energizing non-certified safe electrical equipment located in spaces
protected by air-locks, such as electrical motor-rooms, cargo control rooms, etc.
— Testing of insulation resistance of circuits. Such measurements are only to be made when the ship
is in a gas-free or inerted condition. Where proper records of testing are maintained consideration
may be given to accepting recent readings by the ship’s crew.

Note:
See also Guidance for Marine Industry (Pt.1, Vol.AC) Sec.6.R-120 Survey of electrical equipment installed
in hazardous areas on tankers

3.3.4 Miscellaneous

The instrumentation and safety systems for burning cargo as fuel are to be examined in accordance with
the requirements of 3.3.2.1).

4. Class Renewal Surveys

4.1 General
4.1.1 The schedule of Class Renewal Surveys is to be in accordance with the requirements of Section 3,
B.1.3.1.
4.1.2 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 4.1.4, is in a satisfactory condition and is fit for its intended purpose for the new period of class of 5 years
to be assigned, subject to proper maintenance and operation and to periodical surveys being carried out at
the due dates.
4.1.3 Ballast Tanks, including double bottom tanks, pump rooms, compressor rooms, pipe tunnels,
cofferdams and void spaces bounding cargo tanks, decks and outer hull are to be examined, and this
examination is to be supplemented by thickness measurement and testing required in 4.5 and 4.6, to
ensure that the structural integrity remains effective. The aim of the examination is to discover Substantial
Corrosion, significant deformation, fractures, damages or other structural deterioration, that may be
present.
4.1.4 All piping systems within the above spaces, except those covered by 4.7, are to be examined and
operationally tested to working pressure to attending Surveyor’s satisfaction to ensure that tightness and
condition remain satisfactory.
4.1.5 The survey extent of ballast tanks converted to void spaces is to be specially considered in relation
to the requirements for ballast tanks.
Note:
For survey of automatic air pipes refer to Section 3, B.1.3.2.13).

4.2 Dry Dock Survey

4.2.1 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo tanks and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the ballast tanks are considered to be the parts below light ballast water line.

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4.3 Tank Protection

4.3.1 Where provided, the condition of corrosion prevention system of ballast tanks is to be examined. For
ballast tanks, excluding double bottom tanks, where a hard-protective coating is found in POOR condition
and it is not renewed, where soft or semi-hard coating has been applied, or where a hard-protective coating
was not applied from time of construction, the tanks in question are to be examined at annual intervals.
Thickness measurements are to be carried out as deemed necessary by the surveyor.
When such breakdown of hard protective coating is found in double bottom ballast tanks and it is not
renewed, where a soft or semi-hard coating has been applied, or where a hard-protective coating was not
applied from the time of construction, the tanks in question may be examined at annual intervals. When
considered necessary by the surveyor, or where extensive corrosion exists, thickness measurements are to
be carried out.
4.3.2 Where the hard protective coating in ballast tanks is found to be in a GOOD condition, the extent of
close-up surveys and thickness measurements may be specially considered.

4.4 Extent of Overall and Close-up Survey

4.4.1 An Overall Survey of all tanks and spaces, excluding fuel oil, lube oil and fresh water tanks, is to be
carried out at each Class Renewal Survey.
Note:
For fuel oil, lube oil and fresh water tanks, reference is to be made to Table 3.3.
4.4.2 The minimum requirements for Close-up Surveys at Class Renewal Survey are given in Table 4-II.2.
4.4.3 The Surveyor may extend the Close-up Survey as deemed necessary taking into account the
maintenance of the tanks under survey, the condition of the corrosion prevention system and where tanks
have structural arrangements or details which have suffered defects in similar tanks or on similar ships
according to available information.
4.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD, the extent of Close-up
Surveys according to Table 4-II.2 may be specially considered.
Note:
For examination of automatic air pipes reference is to be made to Table 3.4.

4.5 Extent of Thickness Measurement

4.5.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-II.3.
4.5.2 The Surveyor may extend the thickness measurements as deemed necessary. When thickness
measurements indicate substantial corrosion, the extent of thickness measurements is to be increased to
determine the extent of areas of substantial corrosion.
Table 4-II.6 may be used as guidance for these additional thickness measurements.
4.5.3 For areas in tanks where hard protective coating is found to be in a GOOD condition, the extent of
thickness measurements according to Table 4-II.3 may be specially considered.
4.5.4 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements.

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Table 4-II.2 Class Renewal Surveys (Hull) of Liquefied Gas Carriers Minimum Requirements for Close-Up
Surveys

Class Renewal Survey [No.] and ship’s age [years]

I. age ≤ 5 II. 5 < age ≤ 10 III. and subsequent, age > 10
All web frames in a ballast tank, which is to be a
One web frame in a representative
double hull side tank or a top side tank. If such
ballast tank of the topside, hopper side All web frames in all ballast tanks1
1 tanks are not fitted, another ballast tank is to be
and double hull side type
selected1

One transverse bulkhead in a ballast All transverse bulkheads in all

One web frame in each remaining ballast tank1
tank3 ballast tanks2
One transverse bulkhead in each ballast tank2
1 Complete transverse web frame including adjacent structural members.
2 Transverse bulkhead complete, including girder system and adjacent members, and adjacent longitudinal bulkhead
structure.
3 Transverse bulkhead lower part including girder system and adjacent structural members.

Notes:
1. Ballast tanks include topside, double hull side, double bottom, hopper side, or any combined arrangement of the
aforementioned, and peak tanks where fitted.
2. For areas in tanks where coatings are found to be in good condition, the extent of Close-Up Surveys may be specially
considered by BKI.
3. For ships having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of
Close-Up Surveys may be specially considered by BKI.
4. The Surveyor may extend the Close-Up Survey as deemed necessary, taking into account the maintenance of the tanks under
survey, the condition of the corrosion prevention system and also in the following cases:
– in particular, in tanks having structural arrangements or details which have suffered defects in similar tanks, or on similar
ships according to available information;
– in tanks having structures approved with reduced scantlings.

4.6 Extent of Tank testing

4.6.1 All boundaries of ballast tanks and deep tanks used for water ballast within the cargo length area
are to be pressure tested. For Fuel Oil Tanks, the representative tanks are to be pressure tested.
4.6.2 The Surveyor may extend the tank testing as deemed necessary.
4.6.3 Tank testing of fuel oil tanks is to be carried out with a head of liquid to the highest point that liquid
will rise under service conditions. Tank testing of fuel oil tanks may be specially considered based on a
satisfactory external examination of the tank boundaries, and a confirmation from the Master stating that
the pressure testing has been carried out according to the requirements with satisfactory results.

4.7 Surveys of Cargo Installation

4.7.1 General

The requirements of 3.3 apply with the following additions:

4.7.2 Cargo containment survey

1) All cargo tanks are to be examined internally.
2) Special attention is to be given to the cargo tank and insulation in way of chocks, supports and keys.
Removal of insulation may be required in order to verify the condition of the tank or the insulation
itself if found necessary by the Surveyor.
Where the arrangement is such that the insulation cannot be examined, the surrounding structures
of wing tanks, double bottom tanks and cofferdams are to be examined for cold spots when the cargo
tanks are in the cold condition unless voyage records together with the instrumentation give sufficient
evidence of the integrity of the insulation system.

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3) Non-destructive testing:

A) Non-destructive testing is to supplement cargo tank inspection with special attention to be given
to the integrity of the main structural members, tank shell and highly stressed parts, including
welded connections as deemed necessary by the surveyor. However, for type C tanks, this does
not mean that non-destructive testing can be dispensed with totally. The following items are,
inter alia, considered as highly stressed parts:
— cargo tanks supports and anti-rolling/anti-pitching devices,
— web frames or stiffening rings,
— swash bulkhead boundaries,
— dome and stump connections to tank shell,
— foundations for pumps, towers, ladders, etc.,
— pipe connections.
B) For independent tanks type B, the extent of non-destructive testing shall be as given in a
programme specially prepared for the cargo tank design.

4) The tightness of all cargo tanks is to be verified by an appropriate procedure. Provided that the
effectiveness of the ship’s gas detection equipment has been confirmed, it will be acceptable to utilize
this equipment for the tightness test of independent tanks below deck.

5) Where findings of 1) to 4) or an examination of the voyage records raises doubts as to the structural
integrity of a cargo tank, a hydraulic or hydro-pneumatic test is to be carried out. For integral tanks
and for independent tanks type A and B, the test pressure is to be in accordance with proper pressure
based on design of each tank (correspond to the Maximum Allowable Relief Valve Setting, MARVS of
the tank). For independent tanks type C, the test pressure is not to be less than 1,25 times the MARVS.

6) At every other Class Renewal Survey (i.e., 2nd, 4th, 6th, etc.), all independent cargo tanks type C are
to be either:

A) Hydraulically or hydro-pneumatically tested to 1,25 times MARVS, followed by nondestructive

testing in accordance with 3).A), or
B) Subjected to a thorough, planned non-destructive testing. This testing is to be carried out in
accordance with a programme specially prepared for the tank design. If a special programme
does not exist, the following applies:
— cargo tank supports and anti-rolling/anti-pitching devices,
— stiffening rings,
— Y-connections between tank shell and a longitudinal bulkhead of bilobe tanks,
— swash bulkhead boundaries,
— dome and sump connections to the tank shell,
— foundations for pumps, towers, ladders etc.,
— pipe connections.

At least 10% of the length of the welded connections in each of the above mentioned areas is to be
tested. This testing is to be carried out internally and externally as applicable. Insulation is to be
removed as necessary for the required non-destructive testing.

7) As far as practicable all hold spaces and hull insulation (if provided), secondary barriers and tank
supporting structures are to be visually examined. The secondary barrier of all tanks is to be
checked for their effectiveness by means of a pressure/vacuum test, a visual examination or another
acceptable method.

8) Membrane and semi-membrane tank

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A) For membrane and semi-membrane tanks systems, inspection and testing are to be carried out
in accordance with programmes specially prepared in accordance with an approved method for
the actual tank system.
B) For membrane containment systems a tightness test of the primary and secondary barrier shall
be carried out in accordance with the system designers’ procedures and acceptance criteria
as approved by BKI. Low differential pressure tests may be used for monitoring the cargo
containment system performance, but are not considered an acceptable test for the tightness
of the secondary barrier.
C) For membrane containment systems with glued secondary barriers if the designer’s threshold
values are exceeded, an investigation is to be carried out and additional testing such as
thermographic or acoustic emissions testing should be carried out.

9) The pressure/vacuum relief valves, rupture disc and other pressure relief devices for interbarrier
spaces and hold spaces are to be opened, examined, tested and readjusted as necessary, depending
on their design.

10) The pressure relief valves for the cargo tanks are to be opened for examination, adjusted, function
tested, and sealed. If the cargo tanks are equipped with relief valves with non-metallic membranes
in the main or pilot valves, such non-metallic membranes are to be replaced. Where a proper
record of continuous overhaul and retesting of individually identifiable relief valves is maintained,
consideration will be given to acceptance on the basis of opening, internal examination, and testing
of a representative sampling of valves, including each size and type of liquefied gas or vapor relief
valve in use, provided there is logbook evidence that the remaining valves have been overhauled and
tested since crediting of the previous Class Renewal Survey.

4.7.3 Piping systems

1) The cargo, liquid nitrogen and process piping systems, including valves, actuators, compensators,
etc. are to be opened for examination as deemed necessary. Insulation is to be removed as deemed
necessary to ascertain the condition of the pipes. If the visual examination raises doubt as to the
integrity of the pipelines, a pressure test at 1,25 times the MARVS for the pipeline is to be carried
out. After re-assembly the complete piping systems are to be tested for leaks.

2) The pressure relief valves are to be function-tested. A random selection of valves is to be opened for
examination and adjusted.

4.7.4 Components

Cargo pumps, compressors, process pressure vessels, liquid nitrogen tanks, heat exchangers and other
components, including prime movers, used in connection with cargo handling and methane boil-off burning
are to be examined as required in the BKI Rules for periodical survey of machinery.

4.7.5 Miscellaneous
.1 Systems for removal of water or cargo from interbarrier spaces and holds are to be examined and
tested as deemed necessary.
.2 All gas-tight bulkheads are to be inspected. The effectiveness of gas-tight shaft sealing is to be verified.
.3 The following equipment is to be examined: hoses and spool pieces used for segregation of piping
systems for cargo, inert gas and bilging.
.4 It is to be verified that all cargo piping systems are electrically bonded to the hull.

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Table 4-II.3 Class Renewal Surveys (Hull) of Liquefied Gas Carriers Minimum Requirements for Thickness
Measurements

Class Renewal Survey [No.] and ship’s age [years]

I. age ≤ 5 II. 5 < age ≤ 10 III. 10 < age ≤ 15 IV. and subsequent, age > 15
One section of deck plating Within the cargo area: Within the cargo area: Within the cargo area:
for the full beam of the ship – each deck plate three
– each deck plate – each deck plate
within 0,5L amidships in way transverse sections1
of a ballast tank, if any – one transverse section
– each bottom plate duct keel
within 0,5L amidships in – two transverse sections1
plating and internals
way of a ballast tank, if any
– all wind and water strakes
All wind and water strakes, full
Selected wind and water strakes outside the cargo area
length
Measurements, for general assessment and recording of corrosion pattern, of those structural members subject to Close-Up
Survey according to Table 4-II.2
Suspect areas
1 At least one section is to include a ballast tank within 0,5L amidships, if any.
Notes:
1. For ships having independent tanks of type C, with a midship section similar to that of a general cargo ship, the extent of
thickness measurements may be increased to include the tank top plating at the discretion of the Surveyor.
2. For areas in spaces where coatings are found to be in good condition, the extent of thickness measurements may be specially
considered by BKI.
3. The Surveyor may extend the thickness measurements as deemed necessary. Where substantial corrosion is found, the extent
of thickness measurements is to be increased to the satisfaction of the Surveyor.

B. General Dry Cargo Ships

1. General requirements
1.1 Application
1.1.1 In addition to the requirements specified in Section 3, the requirements in this section apply to all
self-propelled general dry cargo ships of 500 GT and above carrying solid cargoes other than12) :
— bulk carriers and double skin bulk carriers subject to the enhanced survey programme (ESP)

— dedicated container carriers

— Ro-Ro cargo ships

— refrigerated cargo ships

— dedicated wood chip carriers

— dedicated cement carriers

— livestock carriers

— deck cargo ship13)

— general dry cargo ships of double side-skin construction, with double side-skin extending for the
length of the cargo area, and for the height of the cargo hold to the upper deck14)
1.1.2 For General Dry Cargo Ships with hybrid cargo hold arrangements, e.g. with some cargo holds of
single-side skin and others of double-side skin, the requirements are to be applied only to structure in way
of the single-side skin cargo hold region.
12)
The requirements of paragraphs 3.7 and 5.7 also apply to those cargo ships, which, although belonging to the ship types
listed in 1.1.1 that are excluded from the application of this section, are fitted with a single cargo hold.
13)
A deck cargo ship is a ship that is designed to carry cargo exclusively above deck without any access for cargo below deck.
14)
Special consideration may also be given to ships that are of double side-skin construction but with single skin in way of several
frame spaces e.g. in way of a cargo hold entrance or in way of forebody hull form at the forward end of the foremost cargo hold

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1.1.3 The requirements apply to surveys of hull structure and piping systems in way of cargo holds,
cofferdams, pipe tunnels, void spaces and fuel oil tanks within the cargo area and all ballast tanks.
1.1.4 The requirements contain the minimum extent of examination, thickness measurements and tank
testing. The survey is to be extended when Substantial Corrosion and/or structural defects are found and
include additional Close-up Survey when necessary.

2. Procedures for Thickness Measurements

2.1 General
2.1.1 The required thickness measurements, if not carried out by BKI itself, are to be witnessed by BKI
Surveyor. The Surveyor is to be on board to the extent necessary to control the process. In this case, the
control of thickness measurement process is to be in accordance with the separate requirements specified
by BKI.
2.1.2 The thickness measurement firm is to be part of the survey planning meeting to be held prior to
commencing the survey.
2.1.3 Thickness measurements of structures in areas where Close-up Surveys are required shall be carried
out simultaneously with Close-up Surveys. See Section 3, D.1.4.

2.2 Certification of Thickness Measurement Firm

The thickness measurements are to be carried out by a firm certified by BKI according to principles stated
in Section 3, A.5.3.1.

2.3 Reporting
2.3.1 A thickness measurement report is to be prepared. The report is to give the location of
measurements, the thickness measured as well as corresponding original thickness. Furthermore, the
report is to give the date when the measurements were carried out, type of measurement equipment,
names of personnel and their qualifications and has to be signed by the operator.
2.3.2 The Surveyor is to review the final thickness measurement report and countersign the cover page.

3. Annual Survey
3.1 General
3.1.1 The due range of Annual Survey is to be in accordance with the requirements of Section 3, B.1.1.1.
3.1.2 The survey is to consist of an examination for the purpose of ensuring, as far as practicable, that the
hull, hatch covers, coming and piping are maintained in a satisfactory condition.

3.2 Examination of the hull

3.2.1 Examination of the hull plating and its closing appliances as far as can be seen.
3.2.2 Examination of watertight penetrations as far as practicable.

3.3 Examination of weather decks, hatch covers and coamings

3.3.1 Confirmation is to be obtained that no unapproved changes have been made to the hatch covers,
hatch coamings and their securing and sealing devices since the last survey.

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3.3.2 Where mechanically operated steel covers are fitted, checking the satisfactory condition of:

— hatch covers; including close-up survey of hatch cover plating;

— tightness devices of longitudinal, transverse and intermediate cross junctions (gaskets, gasket lips,
compression bars, drainage channels);

— clamping devices, retaining bars, cleating;

— chain or rope pulleys;

— guides;

— guide rails and track wheels;

— stoppers, etc;

— wires, chains, gypsies, tensioning devices;

— hydraulic system essential to closing and securing;

— safety locks and retaining devices.

3.3.3 Where portable covers, wooden or steel pontoons are fitted, checking the satisfactory condition
where applicable of:

— wooden covers and portable beams, carriers or sockets for the portable beam, and their securing
devices;

— steel pontoons;

— tarpaulins;

— cleats, battens and wedges;

— hatch securing bars and their securing devices;

— loading pads/bars and the side plate edge;

— guide plates and chocks;

— compression bars, drainage channels and drain pipes (if any).

3.3.4 Checking the satisfactory condition of hatch coaming plating and their stiffeners including close-up
survey.
3.3.5 Random checking of the satisfactory operation of mechanically operated hatch covers is to be made
including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed condition;

— operational testing of hydraulic and power components, wires, chains, and link drives.

Note:
For survey of air pipes, flame screens on vents and ventilators refer to Section 3, B.1.1.2.

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3.4 Suspect Areas

Suspect Areas identified at previous surveys are to be examined. Thickness measurements are to be taken of
the areas of substantial corrosion and the extent of thickness measurements is to be increased to determine
the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance for these additional
thickness measurements. These extended thickness measurements are to be carried out before the annual
survey is credited as completed.

3.5 Examination of Cargo Holds

3.5.1 For Ships 10-15 years of age, the following is to apply:
1) Overall Survey of one forward and one after cargo hold and their associated tween deck spaces.

2) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, then the extent of thickness measurements is to be increased to
determine the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance for these
additional measurements. These extended thickness measurements are to be carried out before the
annual survey is credited as completed.

3.5.2 For Ships over 15 years of age, the following is to apply:

1) Overall Survey of all cargo holds and tween deck spaces.

2) Close-up examination of sufficient extent, minimum 25% of frames, to establish the condition of the
lower region of the shell frames including approx. lower one third length of side frame at side shell
and side frame end attachment and the adjacent shell plating in a forward lower cargo hold and one
other selected lower cargo hold. Where this level of survey reveals the need for remedial measures,
the survey is to be extended to include a Close-up Survey of all of the shell frames and adjacent shell
plating of those cargo holds and associated tween deck spaces (as applicable) as well as a Close-up
Survey of sufficient extent of all remaining cargo holds and tween deck spaces (as applicable).

3) When considered necessary by the surveyor, or where extensive corrosion exists thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, then the extent of thickness measurements is to be increased to
determine the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance for these
additional measurements. These extended thickness measurements are to be carried out before the
annual survey is credited as completed.

4) Where the protective coating in cargo holds, as applicable, is found to be in GOOD condition the
extent of close-up surveys may be specially considered.

5) All piping and penetrations in cargo holds, including overboard piping, are to be examined.

3.6 Examination of ballast tanks

Examination of ballast tanks when required as a consequence of the results of the Class Renewal Survey and
Intermediate Survey is to be carried out. When considered necessary by the surveyor, or where extensive
corrosion exists, thickness measurement is to be carried out. If the results of these thickness measurements
indicate that Substantial Corrosion is found, then the extent of thickness measurements are to be increased
to determine the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance for these
additional measurements. These extended thickness measurements are to be carried out before the annual
survey is credited as completed.

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3.7 Additional requirements for single hold cargo ships after determining compliance with SOLAS
II-I/23-3 and II-I/2515)

For ships complying with the requirements of SOLAS II-I/25 for hold water level detectors, the annual survey
is to include an examination and a test, at random, of the water ingress detection system and of their alarms.

4. Intermediate Survey
4.1 General
4.1.1 The due range of Intermediate Survey is to be in accordance with the requirements of Section 3,
B.1.2.1.
4.1.2 Those items which are additional to the requirements of the Annual Survey may be surveyed either
at or between the 2nd and 3rd Annual Survey.
4.1.3 A survey planning meeting is to be held prior to the commencement of the survey.
4.1.4 Concurrent crediting to both Intermediate Survey (IS) and Class Renewal Survey (SS) for surveys and
thickness measurements of spaces are not acceptable.

4.2 Scope
4.2.1 General

The survey extent is dependent on the age of the vessel as specified in 4.2.2 to 4.2.4.

4.2.2 Ships 5 - 10 Years of Age, the following is to apply:

1) Examination Ballast tanks
A) For ballast tanks, an Overall Survey of Representative Tanks selected by the Surveyor is to be
carried out. If such overall survey reveals no visible structural defects, the examination may be
limited to a verification that the corrosion prevention system remains efficient.
B) Where POOR coating condition, soft or semi-hard coating, corrosion or other defects are
found in ballast tanks or where a hard-protective coating was not applied from the time of
construction, the examination is to be extended to other ballast tanks of the same type.
C) In ballast tanks other than double bottom tanks, where a hard-protective coating is found in
POOR condition, and it is not renewed, where soft or semi-hard coating has been applied,
or where a hard-protective coating was not applied from time of construction, the tanks in
question are to be examined and thickness measurements carried out as considered necessary
at annual intervals. When such breakdown of hard protective coating is found in double bottom
ballast tanks, where a soft or semi-hard coating has been applied, or where a hard-protective
coating has not been applied, the tanks in question may be examined at annual intervals.
When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurements are to be carried out.
D) In addition to the requirements above, areas found suspect at previous surveys are to be
surveyed in accordance with the provisions indicated in 3.4.
2) Cargo Holds
A) An Overall Survey of one forward and one after cargo hold and their associated tween deck
spaces.
B) Areas found suspect at previous surveys are to be surveyed in accordance with the provisions
indicated in 3.4.
15)
The requirements of paragraphs 3.7 and 5.7 also apply to those cargo ships, which, although belonging to the ship types
listed in 1.1.1 that are excluded from the application of this Section, are fitted with a single cargo hold.

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4.2.3 Ships 10-15 Years of Age, the following is to apply:

1) Examination Ballast tanks

A) For ballast tanks, an overall survey of all tanks is to be carried out. If such overall survey reveals
no visible structural defects, the examination may be limited to a verification that the corrosion
prevention system remains efficient.
B) The requirements of 4.2.2.1). C) and D) also apply.

2) Cargo Holds

A) An Overall Survey of all cargo holds and tween deck spaces.

B) Areas found suspect at previous surveys are to be surveyed in accordance with the provisions
indicated in 3.4.
C) When considered necessary by the surveyor, or where extensive corrosion exists, thickness
measurement is to be carried out. If the results of these thickness measurements indicate that
Substantial Corrosion is found, then the extent of thickness measurements is to be increased
to determine the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance
for these additional measurements. These extended thickness measurements are to be carried
out before the survey is credited as completed.

4.2.4 Ships over 15 Years of Age, the following is to apply:

1) The requirements of the Intermediate Survey are to be to the same extent as the previous Class
Renewal Survey as required in 5., except for item 2.c) in column 4 of Table 4-II.5. However, tank
testing specified in 5.6, survey of automatic air pipe heads (see Notes in 5.1.6 and 5.4.4) and internal
examination of fuel oil, lube oil and fresh water tanks (see 5.4.1) are not required unless deemed
necessary by the attending surveyor.

2) In application of 1), the intermediate survey may be commenced at the second annual survey and be
progressed during the succeeding year with a view to completion at the third annual survey in lieu of
the application of Section 3, B.1.3.1.7).

3) In lieu of the requirements of 5.1.7, an in-water survey, according to the provisions of Section 3,
B.1.6.1.1), may be considered as equivalent.

5. Class Renewal Surveys

5.1 General
5.1.1 The due range of Renewal Surveys is to be in accordance with the requirements of Section 3, B.1.3.1.
5.1.2 A survey planning meeting is to be held prior to the commencement of the survey.
5.1.3 The Renewal Survey is to include, in addition to the requirements of the Annual Surveys,
examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required
in 5.1.5, are in a satisfactory condition and fit for the intended purpose for the new period of class of 5
years to be assigned, subject to proper maintenance and operation and to periodical surveys being carried
out at the due dates.
5.1.4 All cargo holds, ballast tanks, including double bottom tanks, pump rooms, compressor rooms, pipe
tunnels, cofferdams and void spaces bounding cargo tanks, decks and outer hull are to be examined, and
this examination is to be supplemented by thickness measurement and testing as required in 5.5 and 5.6,
to ensure that the structural integrity remains effective.
The aim of the examination is to discover Substantial Corrosion, significant deformation, fractures, damages
or other structural deterioration, that may be present.

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5.1.5 All piping systems within the above spaces are to be examined and operationally tested to working
pressure to attending Surveyor’s satisfaction to ensure that tightness and condition remain satisfactory.
5.1.6 The survey extent of ballast tanks converted to void spaces is to be specially considered in relation
to the requirements for ballast tanks.
Note:
For survey of automatic air pipes refer to Section 3, B.1.3.2.13)
5.1.7 A survey in dry dock is to be a part of the Class Renewal Survey. The overall and close-up surveys
and thickness measurements, as applicable, of the lower portions of the cargo holds and ballast tanks are
to be carried out in accordance with the applicable requirements for Class Renewal Surveys, if not already
performed.
Note:
Lower portions of the cargo holds and ballast tanks are considered to be the parts below light ballast
water line.

5.2 Tank Protection

5.2.1 Where provided, the condition of corrosion prevention system of ballast tanks is to be examined. For
ballast tanks, excluding double bottom tanks, where a hard-protective coating is found in POOR condition
and it is not renewed, where soft or semi-hard coating has been applied, or where a hard-protective coating
was not applied from time of construction, the tanks in question are to be examined at annual intervals.
Thickness measurements are to be carried out as deemed necessary by the surveyor.
5.2.2 When such breakdown of hard protective coating is found in double bottom ballast tanks and it
is not renewed, where a soft or semi-hard coating has been applied, or where a hard-protective coating
was not applied from the time of construction, the tanks in question may be examined at annual intervals.
When considered necessary by the surveyor, or where extensive corrosion exists, thickness measurements
are to be carried out.
5.2.3 Where the hard-protective coating in tanks is found to be in a GOOD condition, the extent of close-up
surveys and thickness measurements may be specially considered.

5.3 Hatch Covers and Coamings

A thorough inspection of the items listed in 3.3 is to be carried out.

5.3.1 Checking of the satisfactory operation of all mechanically operated hatch covers is to be made,
including:

— stowage and securing in open condition;

— proper fit and efficiency of sealing in closed conditions:

— operational testing of hydraulic and power components, wires, chains and link drives.

5.3.2 Checking the effectiveness of sealing arrangements of all hatch covers by hose testing or equivalent
is to be carried out.
5.3.3 Close-up survey and thickness measurement16) of the hatch cover and coaming plating and
stiffeners is to be carried out as given in Table 4-II.4 and Table 4-II.5.
16)
Subject to cargo hold hatch covers of approved design which structurally have no access to the internals, close-up
survey/thickness measurement shall be done of accessible parts of hatch covers structures.

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5.4 Extent of Overall and Close-up Survey

5.4.1 An Overall Survey of all tanks and spaces, excluding fuel oil, lube oil and fresh water tanks, is to be
carried out at each Class Renewal Survey.
Note:
For fuel oil, lube oil and fresh water tanks, reference is to be made to Table 3.3.
5.4.2 The minimum requirements for close-up surveys at Class Renewal Survey are given in Table 4-II.4.
5.4.3 The Surveyor may extend the close-up survey as deemed necessary taking into account the
maintenance of the tanks under survey, the condition of the corrosion prevention system and where tanks
have structural arrangements or details which have suffered defects in similar spaces or on similar ships
according to available information.
5.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD condition, the extent
of close-up surveys according to Table 4-II.4 may be specially considered.
Note:
For examination of automatic air pipe heads, reference is to be made to Table 3.4.

5.5 Extent of Thickness Measurement

5.5.1 The minimum requirements for thickness measurements at Class Renewal Survey are given in Table
4-II.5.
5.5.2 The Surveyor may extend the thickness measurements as deemed necessary. When thickness
measurements indicate substantial corrosion, the extent of thickness measurements is to be increased to
determine the extent of areas of substantial corrosion. Table 4-II.6 may be used as guidance for these
additional thickness measurements.
5.5.3 For areas in tanks where hard protective coatings are found to be in a GOOD condition, the extent
of thickness measurement according to Table 4-II.5 may be specially considered.
5.5.4 Transverse sections are to be chosen where the largest reductions are suspected to occur or are
revealed from deck plating measurements.

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Table 4-II.4 Minimum Requirements for Close-Up Survey at Hull Class Renewal Survey of General Dry
Cargo Ships
Class Renewal survey [No.] and ship’s age [years]
IV. and
I.age ≤ 5 II. 5< age ≤10 III. 10 < age ≤ 15
subsequent, age >15
All shell frames in the
forward lower cargo All shell frames in all
Selected shell frames in hold and 25% cargo holds and tween
one forward and one frames in each of the deck spaces including
Selected shell frames in all cargo
A. aft cargo hold and A. A. remaining cargo holds and A. upper and lower end
holds and tween deck spaces.
associated tween deck tween deck spaces including attachments and
spaces. upper and lower end adjacent
attachments and adjacent shell plating.
shell plating.

One selected cargo hold One transverse bulk-head in All cargo hold transverse Areas (B – F) as for Class
B. B. B.
transverse bulkhead. each cargo hold. bulkheads Renewal survey No.III.

Forward and aft transverse

All cargo hold hatch All transverse bulkheads in
bulkhead in one side ballast
D. covers and coamings B. B. ballast tanks, including
tank, including stiffening
(plating and stiffeners). stiffening system.
system

One transverse web with

associated plating and framing All transverse webs with
in two representative associated plating and
C. C.
ballast tanks of each type (i.e. framing in each ballast
topside,hopper side, side tank tank.
or double bottom tank).

All cargo hold hatch covers and All cargo hold hatch covers
D. coamings (plating and D. and coamings (plating and
stiffeners) stiffener)

Selected areas of all deck plating All deck plating and

and under-deck structure inside underdeck structure inside
E. E.
line of hatch openings between line of hatch openings
cargo hold hatches. between cargo hold hatches.

Selected areas of inner bottom All areas of inner bot-tom

F. F.
plating. plating.
A. Cargo hold transverse frames.
B. Cargo hold transverse bulkhead plating, stiffeners and girders.
C. Transverse web frame or watertight transverse bulkhead in ballast tanks.
D. Cargo hold hatch covers and coamings. Subject to cargo hold hatch covers of approved design which Structurally have no access to the
internals, close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.
E. Deck plating and underdeck structure inside line of hatch openings between cargo hold hatches.
F. Inner bottom plating.
See Fig. 4-II.1 and 4-II.2 for the areas corresponding to A, B, C, D, E and F.

Note:
Close-upsurvey of cargo hold transverse bulkheads to be carried out at the following levels:
– immediately above the inner bottom and immediately above the tween decks, as applicable
– mid-height of the bulkheads for holds without tween decks
– immediately below the main deck plating and tween deck plating

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Table 4-II.5 Minimum Requirements for the Thickness Measurement at Hull Class Renewal Surveys of
General Dry Cargo Ships

Class Renewal survey [No.] and ship’s age [years]

I.age ≤ 5 II. 5 < age ≤10 III. 10 < age ≤ 15 IV. and subsequent, age >15
1. Suspect areas. 1. Suspect areas. 1. Suspect areas. 1. Suspect areas.

2. One transverse section of 2. Two transverse sections

deck plating in way of a within the amidships 0,5L in 2. Within the cargo length
cargo space within the way of two different cargo area:
amidships 0,5L. spaces.
a) A minimum of three
transverse sections within
the amidships 0,5L.
3. Measurement for general 3. Measurement for general
Assessment and recording assessment and recording
of corrosion pattern of of corrosion pattern of b) Each deck plate outside line
those structural members those structural members of cargo hatch ope-nings.
subject to closeup survey subject to close-up survey
according to Table 4-II.4. according to Table 4-II.4.
c) Each bottom plate,
including lower turn of
bilge.
4. Within the cargo length
area, each deck plate d) Duct keel or pipe tunnel
outside line of cargo hatch plating and internals.
openings.

3. Measurement for general

assessment and recording
5. All wind and water strakes of corrosion pattern of
within the cargo length area. those structural members
subject to close-up survey
according to Table 4-II.4.

6. Selected wind and water 4. All wind and water strakes

strakes outside full length
Notes:
1. Thickness measurement locations should be selected to provide the best representative sampling of areas likely
to be most exposed to corrosion, considering cargo and ballast history and arrangement and condition of
protective coatings.
2. For ships less than 100 m in length, the number of transverse sections required at Class Renewal Survey No. III
may be reduced to one and the number of transverse sections at Class Renewal Survey No.IV and
subsequent surveys may be reduced to two.

Table 4-II.6 Additional Thickness Measurements In Way of Substantial corrosion

Structural Member Extent of Measurement Pattern of Measurement

Plating Suspect area and adjacent plates. 5 point pattern over 1 m2 .
Stiffeners Suspect area. 3 measurements each in line across web and flange.

5.6 Extent of Tank Testing

5.6.1 All boundaries of ballast tanks and deep tanks used for water ballast within the cargo area are to be
pressure tested. For fuel oil tanks, the representative tanks are to be pressure tested.
5.6.2 The Surveyor may extend the tank testing as deemed necessary.

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5.6.3 Tank testing of fuel oil tanks is to be carried out with a head of liquid to the highest point that liquid
will rise under service conditions. Tank testing of fuel oil tanks may be specially considered based on a
satisfactory external examination of the tank boundaries, and a confirmation from the Master stating that
the pressure testing has been carried out according to the requirements with satisfactory results.

5.7 Additional requirements for single hold cargo ships after determining compliance with SOLAS
II-I/2515)
For ships complying with the requirements of SOLAS II-I/25 for hold water level detectors, the Class Renewal
Survey is to include an examination and a test of the water ingress detection system and their alarms.

Figure 4-II.1 Areas for Close-Up Survey of General Dry Cargo Ships

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Figure 4-II.2 Areas for Close-Up Survey of General Dry Cargo Ships

C. Shell Doors, Stern Doors, Inner Doors and Bow Doors of Ro-Ro Ships
1. Application
1.1 In addition to the requirements specified in Section 3, the requirements in this section are applicable
to the survey of bow, inner, side shell and stern doors of Ro-Ro passenger (Ro-Pax) and Ro-Ro cargo ships,
to the extent appropriate to the arrangement and equipment of each ship.

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1.2 Special consideration may be given in application of relevant sections of this subsection to commercial
vessels owned or chartered by Governments, which are utilized in support of military operations or service.

2. Annual Surveys
2.1 The survey is to consist of an examination to verify, as far as is practicable, that the bow, inner, side
shell and stern doors are maintained in a satisfactory condition.
2.2 Confirmation is to be obtained that no unapproved changes have been made to the bow, inner, side
shell and stern doors since the last survey.
2.3 Documents
If an Operating and Maintenance Manual (OMM) is required, it is to be verified that an approved copy is
on board and any possible modifications are included.
It is to be verified that documented operating procedures for closing and securing doors are kept on board
and posted at an appropriate place.
The surveyor shall examine the OMM with special attention to the register of inspections and its contents
as a basis for the survey.
2.4 Structural examination
Bow, inner, side shell and stern doors are to be examined with particular attention paid to:

1) Structural arrangement of doors including plating, secondary stiffeners, primary structure, hinging
arms and welding;

2) Shell structure surrounding the opening of the doors and the securing, supporting and locking devices
including shell plating, secondary stiffeners, primary structure, and welding;

3) Hinges and bearings, thrust bearings;

4) Hull and door side supports for securing, supporting and locking devices;

5) Close-up survey of securing, supporting and locking devices including welding, refer to Table 4-II.7.

Whenever a crack is found, an examination with NDT is to be carried out in the surrounding area and for
similar items as considered necessary by the surveyor.
2.5 Measurement of clearances
Clearances of hinges, bearings and thrust bearings are to be taken, where no dismantling is required. Where
the function test is not satisfactory, dismantling may be required to measure the clearances. If dismantling
is carried out, a visual examination of hinge pins and bearings together with NDT of the hinge pin is to be
carried out. Clearances of securing, supporting and locking devices are to be measured, where indicated in
the OMM.
2.6 Sealing arrangement
An examination of packing material / rubber gaskets and retaining bars or channels, including welding is to
be carried out.
2.7 Drainage arrangement
An examination of drainage arrangement, including bilge wells and drain pipes is to be carried out, where
fitted. A test of the bilge system between the inner and outer doors is to be carried out.

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2.8 Function test of doors

Checking of the satisfactory operation of the bow, inner, side shell and stern doors during a complete
opening and closing operation is to be made, as applicable, including:

1) Proper working of the hinging arms and hinges;

2) Proper engagement of the thrust bearings;

3) Device for locking the door in the open position;

4) Securing, supporting and locking devices;

5) Proper sequence of the interlock system for the opening / closing system and the securing and locking
devices;

6) Mechanical lock of the securing devices;

7) Proper locking of hydraulic securing devices in the event of a loss of the hydraulic fluid, according to
the procedure provided by the OMM;

8) Correct indication of open / closed position of doors and securing / locking devices at navigation
bridge and other control stations;

9) Isolation of the hydraulic securing / locking devices from other hydraulic systems;

10) Confirmation that the operating panels are inaccessible to unauthorized persons;

11) Verification that a notice plate giving instructions to the effect that all securing devices are to be
closed and locked before leaving harbour is placed at each operating panel and supplemented by
warning indicator lights;

12) Examination of electrical equipment for opening, closing and securing the doors.

2.9 Function test of the indicator system

Checking of the satisfactory operation of the indicator system, where fitted, is to be carried out, as
applicable, including:

1) Proper visible indication and audible alarm on the navigation bridge panel, according to the selected
function ”harbour / sea voyage” and on the operating panel;

2) Lamp test function on both panels;

3) Verification that it is not possible to turn off the indicator light on both panels;

4) Verification of failsafe performance, according to the procedure provided by the OMM;

5) Confirmation that power supply for indicator system is supplied by the emergency source or other
secure power supply and independent of the power supply for operating the doors;

6) Proper condition of sensors and protection from water, ice formation and mechanical damage.

2.10 Test of water leakage detection system

Where fitted, the water leakage detection system is to be tested including proper audible alarm on the
navigation bridge panel and on the engine control room panel, according to the procedure provided by the
OMM.
2.11 Test of television surveillance system
Where fitted, the television surveillance system is to be tested including proper indication on the navigation
bridge monitor and on the engine control room monitor.

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2.12 Tightness test

A hose test or equivalent is to be carried out. If the visual examination and function test have shown
satisfactory results, the tightness test of shell doors on Ro-Ro cargo ships need not be carried out unless
considered necessary by the attending surveyor.
2.13 NDT and Thickness Measurements
When considered necessary by the surveyor, NDT and thickness measurements may be required after visual
examination and function test.

3. Renewal Surveys
3.1 The Class Renewal Survey is to include, in addition to the requirements of the Annual Survey as
required in 2.1, examination, tests and checks of sufficient extent to verify that the bow, inner, side
shell and stern doors, are in satisfactory condition and considered able to remain in compliance with
applicable requirements, subject to proper maintenance and operation in accordance with the Operation
and Maintenance Manual (OMM) or manufacturer’s recommendations and the periodical surveys being
carried out at the due dates for the five year period until the next Renewal Survey.
3.2 The examinations of the doors are to be supplemented by thickness measurements and testing to
verify compliance with applicable requirements so that the structural and weathertight integrity remain
effective. The aim of the examination is to identify corrosion, significant deformation, fractures, damages
or other structural deterioration, that may be present.
3.3 The bow, inner, side shell and stern doors are to be surveyed as follows:
3.3.1 A survey of the items listed in 2.4, including close-up survey of securing, supporting and locking
devices, together with welding, is to be carried out, refer to Table 4-II.7.
3.3.2 Non-destructive testing and thickness measurements are to be carried out on securing, supporting
and locking devices, including welding, to the extent considered necessary by the surveyor. Whenever a
crack is found, an examination with NDT is to be carried out in the surrounding area and for similar items
as considered necessary by the surveyor.
3.3.3 The maximum thickness diminution of hinging arms, securing, supporting and locking devices is to
be treated according to the BKI normal procedure for primary structures, but is not to be more than 15% of
the as-built thickness or the maximum corrosion allowance of BKI, whichever is less. Certain designs may
be subject to BKI’s special consideration.
3.3.4 Checking the effectiveness of sealing arrangements by hose testing or equivalent is to be carried
out.
3.3.5 Clearances of hinges, bearings and thrust bearings are to be taken. Unless otherwise specified in
the OMM or by manufacturer’s recommendation, the measurement of clearances on Ro-Ro cargo ships
may be limited to representative bearings where dismantling is needed in order to measure the clearances.
If dismantling is carried out, a visual examination of hinge pins and bearings together with NDT of the hinge
pin is to be carried out.
3.3.6 The non-return valves of the drainage system are to be dismantled and examined.
The following is a list of the devices and fittings and associated welding to be subject to close-up survey by
the attending Surveyor.

Table 4-II.7 Minimum Requirements for Close-Up Surveys of Doors, Locking, Securing and Supporting
Devices and Fittings

Cylinder securing pins, supporting brackets, back-up brackets (where fitted) and their welded connections;
Hinge pins, supporting brackets, back-up brackets (where fitted) and their welded connections;
Locking Hooks, securing pins, supporting brackets, back-up brackets (where fitted) and their welded connections;
Locking pins, supporting brackets, back-up brackets (where fitted) and their welded connections;
Locating and stopper devices and their welded connections.

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D. Livestock Carrier
1. General remarks. Kind of surveys.
1.1 The following arrangements relate to livestock carriers as defined in the Guidelines for Livestock
Carriers (Pt.7, Vol.4).
1.2 Unless otherwise stipulated in the following, the requirements in Section 3 apply.

2. Annual survey
2.1 The survey is to include a general examination of:

— spaces for the livestock and related hatch covers (to be surveyed according to Section 3, B.1.1.

— ventilation means, including prime movers

— main, emergency and portable lighting systems in live-stock spaces, passageways and access routes

— the drainage system

— fodder and fresh water system.

3. Class renewal survey

3.1 The equipment related to ventilation, lighting and the related power supply is to be surveyed to the
same extent as required for similar equipment at the class renewal survey as indicated in Section 3, B.1.3.
3.2 The drainage, fodder and fresh water systems, including piping and pumps, are to be surveyed to the
same extent as required for similar equipment at the class renewal survey as indicated in Section 3, B.1.3.
The fresh water tanks are to be internally examined in accordance with the periodicity given in Table 3.3.

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Sec 5 Retrospective Requirements for Existing Ships

Section 5 Retrospective Requirements for Existing

Ships
A. General requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
B. Construction – structure, subdivision and stability, machinery and electrical
installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
C. Construction –Fire protection, fire detection and fire extinction . . . . . . . . . . 5-3
D. Additional safety measures for bulk carriers . . . . . . . . . . . . . . . . . . . . . 5-5
E. Strength and securing of small hatches on the exposed fore deck and air pipes,
ventilator pipes and their closing devices thereover . . . . . . . . . . . . . . . . . 5-9
F. Loading instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
G. Requirements for the fitting of side shell doors, stern doors, bow doors and inner
doors of ro-ro passenger ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
H. Watertightness of chain lockers . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
I. Ice class draught mark of ships intended for navigation in ice . . . . . . . . . . . . 5-12
J. Requirements for electrical distribution system including harmonic filters . . . . . 5-12

A. General requirements
1. This Section contains class-related retrospective requirements of SOLAS Convention and/or IACS URs
for the existing self-propelled ships engaged on international voyages.

B. Construction – structure, subdivision and stability, machinery and electrical installations

1. Safe access to tanker bows as SOLAS 1996-1998 Chapter II-1 Reg. 3-3
1) Application:

A) every tanker constructed on or after 1 July 1998;

B) for tankers constructed before 1 July 1998, such means of access are to be provided at the first
scheduled dry-docking after 1 July 1998, but not later than 1 July 2001.

2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.21, O.

3) For Interpretation to this requirement to Guidance for Code and Convention Interpretation (Pt.1,
Vol.Y) Sec.11 SC 138

2. Emergency towing arrangements on tankers as SOLAS 1999/2000 Chapter II-1 Reg. 3-4
1) Application:

A) every tanker of not less than 20,000 tonnes deadweight constructed on or after 1 July 2002;
B) for tankers of not less than 20,000 tonnes deadweight constructed before 1 July 2002, the design
and construction of emergency towing arrangements are to be approved.

2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.24, F.4.

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3. Stability of ro-ro passenger ships in damaged condition as SOLAS 1996-1998 Chapter II-1 Reg.8
1) Application:

A) ro-ro passenger ships constructed on or after 1 January 2009 are to comply with Rules for Hull
(Pt.1, Vol.II) Sec.36, C.;
B) ro-ro passenger ships constructed on or after 1 July 1997 and before 1 January 2009 are
to comply with the November 1995 amendments, which were adopted by resolution 1 of
the Conference of Contracting Governments to SOLAS, 1974 and amendments adopted by
resolution MSC.47(66);
C) ro-ro passenger ships constructed before 1 July 1997 are to comply with the Rules not later
than the date of the first periodical survey after the date of compliance prescribed in Table 5.1,
according to the value of A/Amax.

Table 5-.1 Compliance Value A/Amax

Value of A/Amax Compliance not later than

Less than 85% 1 October 1998
85% or more but less than 90% 1 October 2000
90% or more but less than 95% 1 October 2002
95% or more but less than 97.5% 1 October 2004
97.5% or more 1 October 2005

4. Special requirements for ro-ro passenger ships certified to carry 400 persons or more as SOLAS
1996-1998 Chapter II-1 Reg.8.3
1) Application: Notwithstanding the requirements of 2.:

A) ro-ro passenger ships constructed on or after 1 January 2009 are to comply with Rules for Hull
(Pt.1, Vol.II) Sec.36;
B) ro-ro passenger ships certified to carry 400 persons or more constructed on or after 1 July 1997
and before 1 January 2009 are to comply with the November 1995 amendments, which were
adopted by resolution 1 of the Conference of Contracting Governments to SOLAS, 1974 and
amendments adopted by resolution MSC.47(66);
C) ro-ro passenger ships certified to carry 400 persons or more constructed before 1 July 1997
are to comply with the requirements of 2) of this paragraph not later than the date of the first
periodical survey after the date of compliance prescribed in Table 5.2 and Table 5.3 or age of
the ship 1) equal to or greater than 20 years, whichever is the latest.

Table 5-.2 Compliance Value A/Amax for 400 persons or more

Value of A/Amax Compliance not later than

Less than 85% 1 October 1998
85% or more but less than 90% 1 October 2000
90% or more but less than 95% 1 October 2002
95% or more but less than 97.5% 1 October 2004
97.5% or more 1 October 2010
1)
The age of the ship means the time counted from the date on which the keel was laid or the date on which it was at a similar
stage of construction or from the date on which the ship was converted to a ro-ro passenger ship.

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Table 5-.3 Number of persons permitted to be carried

Number of persons permitted to be carried Compliance not later than

1500 or more 1 October 2002
1000 or more but less than 1500 1 October 2006
600 or more but less than 1000 1 October 2008
400 or more but less than 600 1 October 2010

5. Construction and initial tests of watertight decks, trunks, etc., in ro-ro passenger ships
1) Ro-ro passenger ships constructed before 1 July 1997 are to comply with the requirements of the
Rules not later than the date of the first periodical survey after 1 July 1997.

2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.11 and as applicable requirement in Annex
A.6.

6. Watertight integrity of the ro-ro deck (bulkhead deck) and below the ro-ro deck
1) Application:

A) ro-ro passenger ships constructed on or after 1 July 1997;

B) ro-ro passenger ships constructed before 1 July 1997 are to comply with the requirements of
the Rules not later than the date of the first periodical survey after 1 July 1997.

2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.11 and as applicable requirement in Annex
A.6.

7. Integrity of the hull and superstructure, damage prevention and control

Application:
All ro-ro passenger ships constructed before 1 January 2009 are to comply with regulation 23-2 of the
November 1995 amendments, which were adopted by resolution 1 of the Conference of Contracting
Governments to SOLAS, 1974, but ro-ro passenger ships constructed before 1 July 1997 are to comply
with paragraph 2 of regulation 23-2 of the above-mentioned amendments not later than the date of
the first periodical survey after 1 July 1997.

8. Supplementary emergency lighting for ro-ro passenger ships

1) Application:

All ro-ro passenger ships, except that for ships constructed before 22 October 1989, this
requirement is to apply not later than 22 October 1990.

2) Technical requirements: see Rules for Electrical Installations Pt.1, Vol.IV) Sec.16, F.

C. Construction –Fire protection, fire detection and fire extinction

1. Protection of cargo pump-rooms in tankers
1) Application:

All tankers constructed before 1 July 2002 are to be fitted with the devices and a system
for continuous monitoring of the concentration of hydrocarbon gases as required, at the first
scheduled dry-docking after 1 July 2002, but not later than 1 July 2005.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.15, B.1 (SOLAS Reg.
II-2/4.5.10.1.1 and 4.5.10.1.4).

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2. Carriage of emergency escape breathing devices

1) Application: All ships constructed before 1 July 2002 are to carry the required emergency escape
breathing devices not later than the date of the first survey after 1 July 2002.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Annex B, G.4 (SOLAS Reg.
II-2/13.3.4.2 to 13.3.4.5 and 13.4.3).

3. Part E, Operational requirements of SOLAS II-2

1) Application: All ships constructed before 1 July 2002 are to comply with the relevant requirements
not later than the date of the first survey after 1 July 2002.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.15 (relevant
requirements of SOLAS II-2/Part E, excluding Reg. 16.3.2.2 and 16.3.2.3).

4. Fire-extinguishing systems using Halon 1211, 1301, and 2402 and perfluorocarbons
1) Application: New installation of such systems is prohibited for all ships constructed before 1 July
2002.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.12 (SOLAS Reg.
II-2/10.4.1.3).

5. Deep-fat cooking equipment

1) Application: New installation of such equipment or replacement of the existing equipment with such
equipment for all ships constructed before 1 July 2002 is to comply with the relevant requirements.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.12, N.3 (SOLAS Reg.
II-2/10.6.4).

6. Fixed water-based local application fire-extinguishing system

1) Application: Passenger ships and ro-ro passenger ships of 2000 gross tonnage and above
constructed before 1 July 2002 are to be fitted with the required fixed water-based local application
fire-extinguishing system not later than 1 October 2005.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.12, L.3 (SOLAS Reg.
II-2/10.5.6).

7. Diesel engines: High-pressure fuel delivery lines protected with a jacketed piping system, surfaces
with temperatures above 2200 C and isolation of fuel piping
1) Application: All ships (ships to which the Rules apply, the same below) constructed on or after 1
February 1992 but before 1 July 1998 are to comply with the relevant requirements not later than 1
July 2003. However, an appropriate cover of the fuel injection pump serving more than one nozzles,
in engines having a power output of 375 kW or below, may replace the required jacketed protection
system.

2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.12, B.6.4 (SOLAS Reg.
II- 2/4.2.2.5.2, 4.2.2.5.3 and 4.2.2.6.1).

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8. Secondary means for pressure/vacuum relief in cargo tanks

1) Application: All tankers constructed before 1 July 1998 are to comply with the relevant requirements
before the date of the first scheduled dry-docking after 1 July 1998, but not later than 1 July 2001.
2) Technical requirements: see Rules for Hull Pt.1, Vol.II) Sec.22, A (SOLAS Reg. II-2/11.6.3.2 and
4.5.3.2.3).

9. Additional requirements for means of escape of ro-ro passenger ships

1) Application: Ro-ro passenger ships constructed before 1 July 1997 are to comply with the relevant
requirements at the date of the first periodical survey after 1 July 1997.
2) Technical requirements: see Rules for Hull Pt.1, Vol.II) Sec.22, A (SOLAS Reg. II-2/13.7).

10. Inert gas systems

1) Application: All tankers constructed before 1 September 1984:
A) Tankers of 20000 tonnes deadweight and upwards and carrying crude oil are to be fitted with a
required inert gas system:
a) for tankers of 70000 tonnes deadweight and upwards, not later than 1 September 1984 or
the date of delivery of the ship, whichever comes later;
b) for tankers of less than 70000 tonnes deadweight, not later than 1 May 1985 or the date
of delivery of the ship, whichever comes later. However, tankers of less than 40000 tonnes
deadweight, which are not fitted with oil tank washing machines having an individual
discharge capacity of more than 60 m3 /h, may not be fitted with the inert gas system.
B) Tankers of 40000 tonnes deadweight and upwards and carrying oils other than crude oil as well
as tankers of 20000 tonnes deadweight and upwards and carrying oils other than crude oil,
both of which are fitted with oil tank washing machines having an individual discharge capacity
of more than 60 m3 /h, are to be fitted with the required inert gas system:
a) for tankers of 70000 tonnes deadweight and upwards, not later than 1 September 1984 or
the date of delivery of the ship, whichever comes later;
b) for tankers of less than 70000 tonnes deadweight, not later than 1 May 1985 or the date
of delivery of the ship, whichever comes later.
2) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec. 11, O.1.6.4.1.7
(Chapter 15 of the International Code for Fire Safety Systems (FSS Code)).

D. Additional safety measures for bulk carriers

1. Evaluation of scantlings of the transverse watertight corrugated bulkhead between cargo holds Nos.1
and 2, with cargo hold No.1 flooded, for existing bulk carriers
1) These requirements apply to all bulk carriers of 150 m in length and above, in the foremost hold,
intending to carry solid bulk cargoes having a density of 1,78 t/m3 or above, with single deck, topside
tanks and hopper tanks, fitted with vertically corrugated transverse watertight bulkheads between
cargo holds Nos.1 and 2 where:
A) the foremost hold is bounded by the side shell only for ships which were contracted for
construction prior to 1 July 1998, and have not been constructed in compliance with IACS
Unified Requirement S18; or
B) the foremost hold is double side skin construction of less than 760 mm breadth measured
perpendicular to the side shell in ships, the keels of which were laid, or which were at a similar
stage of construction, before 1 July 1999 and have not been constructed in compliance with
IACS Unified Requirement S18 (Rev.2, Sept. 2000).

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2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.23, J

2. Evaluation of Allowable Hold Loading of cargo hold No.1 with cargo hold No.1 flooded, for existing
bulk carriers
1) Application: All bulk carriers of 150 m in length and above, in the foremost hold, intending to carry
solid bulk cargoes having a density of 1,78 t/m3 or above, with single deck, topside tanks and hopper
tanks, where:

A) the foremost hold is bounded by the side shell only for ships which were contracted for
construction prior to 1 July 1998, and have not been constructed in compliance with IACS
Unified Requirement S20; or
B) the foremost hold is double side skin construction of less than 760 mm breadth measured
perpendicular to the side shell in ships, the keels of which were laid, or which were at a similar
stage of construction, before 1 July 1999 and have not been constructed in compliance with
IACS Unified Requirement S20.

Early completion of a Renewal survey coming due after 1 July 1998 to postpone compliance is not
allowed.

2) Technical requirements: see Rules for Hull (Pt.1, Vol.II) Sec.23, E

3. Implementation of IACS Unified Requirements S19 and S22 for existing single side skin bulk carriers
1) Application:

A) The requirements for the corrugated bulkhead between cargo holds Nos.1 and 2 in Rules
Machinery Installations (Pt.1, Vol.III) Sec.15, B.4.3 and the requirements for strengthening of
double bottom structure of No.1 hold in Rules Machinery Installations (Pt.1, Vol.III) Sec.15,
B.4.3.4 are to be applied in conjunction with the damage stability requirements set forth in this
paragraph for withstanding flooding of the foremost cargo hold. The schedule for compliance
is given in Rules Machinery Installations (Pt.1, Vol.III) Sec.15, B.4.3.4

2) Technical requirements: see Section 4, I.E.1.2.2

Table 5-.4 Age of ship

No. Age of ship Schedule for compliance

1 20 years or more on 1 July 1998 Due date of the first intermediate survey, or due date
of the first Renewal survey to be held after 1 July 1998,
whichever comes first
2 15 years or more but less than 20 Due date of the first Renewal survey to be held after 1 July
years on 1 July 1998 1998, but not later than 1 July 2002
3 10 years or more but less than 15 Due date of the first intermediate survey or Renewal
years on 1 July 1998 survey to be held after the date on which the ship reaches
15 years of age but not later than the date on which the
ship reaches 17 years of age
4 5 years or more but less than 10 Due date, after 1 July 2003, of the first intermediate or
years on 1 July 1998 the first Renewal survey after the date on which the ship
reaches 10 years of age, whichever occurs first
5 Less than 5 years on 1 July 1998 The date on which the ship reaches 10 years of age

Note:
For the ships listed under No.4 of Table 5.4, attention is to be paid to the following:

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1. Where the due date of the intermediate or Renewal survey is after 1 July 2003 (the due date of the
intermediate survey means the third anniversary date of the annual survey) and the intermediate or
Renewal survey is completed before 1 July 2003, the evaluation required by 1., 2. and 3. is not allowed
to be postponed, i.e. it is to be completed within 3 months after the due date of this intermediate
survey or by the due date of the Renewal survey.

2. Where the due date of the intermediate survey is before 1 July 2003 and the intermediate survey is
completed before 1 July 2003, this intermediate survey may be accepted, i.e. the evaluation required
by 1., 2. and 3. may be performed at the first Renewal survey after 1 July 2003.

4. Cargo hatch cover securing arrangements for bulk carriers

1) Application: All bulk carriers which were not built in accordance with Rules for Hull (Pt.1, Vol.II)
Sec.17, B.

2) Schedule for compliance: The ships to which A) applies are to comply with C) in accordance with the
following schedule:

A) for ships which are 15 years of age or more on 1 January 2004 by the due date of the first
intermediate or Renewal survey after that date;
B) for ships which are 10 years of age or more on 1 January 2004 by the due date of the first
Renewal survey after that date;
C) for ships which are less than 10 years of age on 1 January 2004 by the date on which the ship
reaches 10 years of age.

Completion prior to 1 January 2004 of an intermediate or Renewal survey with a due date after 1
January 2004 cannot be used to postpone compliance. However, completion prior to 1 January 2004
of an intermediate survey the window for which straddles 1 January 2004 can be accepted.

3) Technical requirements: Hatch cover securing devices and stoppers for cargo hold hatchways No.1
and No.2 which are wholly or partially within 0,25 L of the fore perpendicular (except pontoon type
hatch covers) are to comply with Rules for Hull (Pt.1, Vol.II) Sec.17, B.5.6 and 5.7.

5. Renewal criteria for side shell frames and brackets in single side skin bulk carriers and single side skin
OBO carriers
1) Application:

A) The requirements apply to the side shell frames and brackets of cargo holds bounded by the
single side shell of bulk carriers which were not built in accordance with IACS UR S122) Rev. 1
or subsequent revisions.
B) The requirements also apply to the side shell frames and brackets of cargo holds bounded by
the single side shell of Oil/Bulk/Ore (OBO) carriers of single side skin construction.

2) Schedule for compliance:

A) Bulk carriers are to be assessed for compliance with the requirements and steel renewal,
reinforcement or coating, where required, is to be carried out in accordance with the following
schedule and at subsequent intermediate and Renewal surveys:
a) for bulk carriers which are 15 years of age or more on 1 January 2004 by the due date of
the first intermediate or Renewal survey after that date;
b) for bulk carriers which are 10 years of age or more on 1 January 2004 by the due date of
the first Renewal survey after that date;
2)
IACS UR S12 - Side Structures in Single Side Skin Bulk Carriers.

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c) for bulk carriers which are less than 10 years of age on 1 January 2004 by the date on which
the ship reaches 10 years of age.
Completion prior to 1 January 2004 of an intermediate or Renewal survey with a due date
after 1 January 2004 cannot be used to postpone compliance. However, completion prior to
1 January 2004 of an intermediate survey the window3) for which straddles 1 January 2004 can
be accepted.
B) OBO carriers are to be assessed for compliance with the requirements and steel renewal,
reinforcement or coating, where required, is to be carried out in accordance with the following
schedule and at subsequent intermediate and Renewal surveys:
a) for OBO carriers which are 15 years of age or more on 1 July 2005 by the due date of the
first intermediate or Renewal survey after that date;
b) for OBO carriers which are 10 years of age or more on 1 July 2005 by the due date of the
first Renewal survey after that date;
c) for OBO carriers which are less than 10 years of age on 1 July 2005 by the date on which
the ship reaches 10 years of age.
Completion prior to 1 July 2005 of an intermediate or Renewal survey with a due date after 1
July 2005 cannot be used to postpone compliance. However, completion prior to 1 July 2005 of
an intermediate survey the window for which straddles 1 July 2005 can be accepted.
3) The evaluation criteria are given in Annex B.11

6. Survey of the cargo hold structure of bulk carriers

Bulk carriers constructed before 1 July 1999, of 150 m in length and upwards of single side skin construction,
of 10 years of age and over, are not to carry solid bulk cargoes having a density of 1,78 t/m3 and above unless
it has satisfactorily undergone either:
1) a periodical survey in accordance with the enhanced programme of inspections required by SOLAS
regulation XI-1/2; or
2) a survey of all cargo holds to the same extent as required for periodical surveys in the enhanced
survey programme of inspections required by regulation XI-1/2.

7. Requirements for the fitting of a forecastle

1) Application: All bulk carriers (including ore carriers and combination carriers) which are contracted
for construction on or after 1 January 2004, as defined in Section 4.I.E and F.
2) Technical requirements: Rules for Hull (Pt.1, Vol.II) Sec.23.G is to be complied with.

8. Hold, ballast and dry space water level detectors

1) Application: All bulk carriers of 500 gross tonnage and upwards and engaged on international
voyages.
2) Schedule for compliance:
A) bulk carriers constructed on or after 1 July 2004 are to comply with the requirements of this
paragraph on the date of being commissioned;
B) the water level alarm of bulk carriers constructed before 1 July 2004 is to comply with the
requirements of this paragraph not later than the date of the annual, intermediate or Renewal
survey of the ship to be carried out after 1 July 2004, whichever comes first.
3) Technical requirements: see Rules for Electrical Installations (Pt.1, Vol.IV) Sec.18.
3)
Windows means the time span allowed for completing a specific type of survey.

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9. Availability of pumping systems

1) Application: Bulk carriers.

2) Schedule for compliance: Bulk carriers constructed before 1 July 2004 are to comply with the
requirements of this paragraph not later than the date of the first intermediate or Renewal survey of
the ship to be carried out after 1 July 2004, but in no case later than 1 July 2007.

3) Technical requirements: see Rules for Machinery Installations (Pt.1, Vol.III) Sec.11 ,M.4.13 and Rules
for Electrical Installations (Pt.1, Vol.IV) Sec.18.

10. Restriction on sailing with any cargo hold being empty

Bulk carriers of 150 m in length and upwards of single side skin construction, designed to carry cargoes
having a density of 1.78 t/m3 and above, where they comply neither with the requirement of SOLAS
Reg. XII/5.1 for having sufficient strength to withstand flooding of any one cargo hold nor with resolution
MSC.168(79) Standards and Criteria for Side Structures of Bulk Carriers of Single-Side Skin Construction, are
not allowed to sail after the date of reaching 10 years of age if any cargo hold is loaded below 10% of the
maximum permissible loading of that hold in the full load condition. For the purpose of this paragraph, the
full load condition means that the ship is loaded to not less than 90% of its deadweight in relation to the
freeboard assigned.

E. Strength and securing of small hatches on the exposed fore deck and air pipes, ventilator
pipes and their closing devices thereover
1. Application
1) General dry cargo ships (excluding container ships, vehicle carriers, ro-ro ships and woodchip
carriers), ore carriers, combination carriers (e.g. oil/bulk/ore carriers, ore/oil carriers) and bulk
carriers that are contracted for construction prior to 1 January 2004, of 100 m in length or more.

2. Schedule for compliance:

1) The requirements of 3. are to be complied with in accordance with the following schedule:

A) for ships which are 15 years of age or more on 1 January 2004 by the due date of the first
intermediate or Renewal survey after that date;
B) for ships which are 10 years of age or more on 1 January 2004 by the due date of the first
Renewal survey after that date;
C) for ships which are less than 10 years of age on 1 January 2004 by the date on which the ship
reaches 10 years of age.

Completion prior to 1 January 2004 of an intermediate or Renewal survey with a due date after 1
January 2004 cannot be used to postpone compliance. However, completion prior to 1 January 2004
of an intermediate survey the window for which straddles 1 January 2004 can be accepted.

2) Ships (on the exposed deck over the forward 0,25L, applicable to all ship types of sea-going service of
80 m in length or more, where the height of the exposed deck in way of the hatch is less than 0,1L or
22 m above the summer load waterline, whichever is the lesser) that are contracted for construction
on or after 1 January 2004 are to comply by the time of delivery.

3. Technical requirements
1) The strength and securing of the small hatches on the exposed deck giving access to spaces forward
of the collision bulkhead (and to spaces which extend over this line aft-wards) is to comply with Rules
for Hull (Pt.1, Vol.II) Sec.17, D.2.

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2) Air pipes, ventilator pipes and their closing devices in way of the locations referred to in A) above are
to comply with Rules for Hull (Pt.1, Vol.II) Sec.17, D.2.

F. Loading instruments
1. Loading instruments for strength calculation
1) Application:

A) Type I ships of 100 m or over in length, as defined in Rules for Hull (Pt.1, Vol.II) Sec.5, A.4.
B) Bulk carriers (including ore carriers and combination carriers) of 150 m or over in length, as
defined in Rules for Hull (Pt.1, Vol.II) Sec.5, A.4.

2) Schedule for compliance:

A) Bulk carriers (including ore carriers and combination carriers) of 150 m or over in length and
contracted for construction before 1 July 1998 are to be fitted with loading instruments not
later than the date of delivery or 1 January 1999, whichever is later.
B) Ships contracted for construction on or after 1 July 1998 are to be fitted with loading instruments
before the date of delivery.

3) Technical requirements: Rules for Hull (Pt.1, Vol.II) Sec.5, A.4. and Guidelines for Certification of
Loading Computer System (Pt.4, Vol.1) are to be complied with.

2. Loading instruments for providing intact stability information

1) Application: All bulk carriers less than 150 m in length and constructed on or after 1 July 2006.

2) Technical requirements: Rules for Hull (Pt.1, Vol.II) Sec.23, B is to be complied with.

3. Onboard computers for stability calculations

1) Application: All ships contracted for construction on or after 1 July 2005 and fitted with computers
for stability calculations.

2) Technical requirements: Guidelines for Certification of Loading Computer System (Pt.4, Vol.1) Sec. 1
is to be complied with.

G. Requirements for the fitting of side shell doors, stern doors, bow doors and inner doors of
ro-ro passenger ships
1. Side shell doors and stern doors
1) Application: All existing ro-ro passenger ships with the date of building before 30 June 1996:

A) The structural condition of side shell doors and stern doors, especially the primary structure, the
securing and supporting arrangements and the hull structure alongside and above the doors,
are to be specially examined and any defects rectified.

2) The following measures are to be complied with by all existing ro-ro passenger ships with the date of
building before 30 June 1996:

A) The structural arrangement of securing devices and supporting devices of inwards opening
doors in way of these securing devices and, where applicable, of the surrounding hull structure
is to be reassessed in accordance with the applicable requirements of Rules for Hull (Pt.1, Vol.II)
Sec.6, H.2.1 and modified accordingly.

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B) The securing and locking arrangements for side shell doors and stern doors which may lead to
the flooding of a special category space or ro-ro space as defined in Rules for Hull (Pt.1, Vol.II)
Sec.6, H.1.3 are to comply with the following requirements:
a) separate indicator lights and audible alarms are to be provided on the navigation bridge
and on each operating panel to indicate that the doors are closed and that their securing
and locking devices are properly positioned;
b) the indication panel is to be provided with a lamp test function. It is not to be possible to
turn off the indicator light;
c) the indication panel on the navigation bridge is to be equipped with a mode selection
function “harbour/sea voyage”, so arranged that audible alarm is given if the ship leaves
harbour with side shell or stern doors not closed or with any of the securing devices not in
the correct position;
d) a water leakage detection system with audible alarm and television surveillance is to be
arranged to provide an indication to the navigation bridge and to the engine control room
of any leakage through the doors.
C) Documented operating procedures for closing and securing side shell and stern doors are to be
kepton board and posted at the appropriate places.

2. Bow doors and inner doors

1) Application: All existing ro-ro passenger ships with the date of building before 30 June 1996. Technical
requirements are as follows:
A) The structural condition of bow doors and inner doors, especially the primary structure, the
securing and supporting arrangements and the hull structure alongside and above the doors,
are to be specially examined and any defects rectified.
B) The requirements of Rules for Hull (Pt.1, Vol.II) Sec.6, H.8 concerning operating procedures of
the bow door and inner door are to be complied with.
2) The following measures are to be complied with by all existing ro-ro passenger ships with the date of
building before 30 June 1996:
A) The location and arrangement of inner doors are to comply with Rules for Hull (Pt.1, Vol.II) Sec.6,
H.1.2.4.
B) Ships with visor door are to comply with Rules for Hull (Pt.1, Vol.II) Sec.6, H.3.1.3 requiring
redundant provision of securing devices preventing the upward opening of the bow door. In
addition, where the visor door is not self-closing under external loads (i.e. the closing moment
My calculated in accordance with Rules for Hull (Pt.1, Vol.II) Sec.6, H.6.2.7 is less than zero)
then the opening moment Mo is not to be taken less than -My. If drainage arrangements in
the space between the inner and bow doors are not fitted, the value of Mo is to be specially
considered. Where available space above the tank top does not enable the full application of
Rules for Hull (Pt.1, Vol.II) Sec.6, H.3.1.3 equivalent measures are to be taken to ensure that the
door has positive means for being kept closed during seagoing operation.
C) Ships with visor door are to comply with Rules for Hull (Pt.1, Vol.II) Sec.6, H.6.2.8 requiring
securing and supporting devices excluding hinges to be capable of bearing the vertical design
force (Fz – 10W) without exceeding the permissible stresses given in with visor door are to
comply with Rules for Hull (Pt.1, Vol.II) Sec.6, H.4.3.3
D) For side-opening doors, the structural arrangements for supporting vertical loads, including
securing devices, supporting devices and, where applicable, hull structure above the door, are
to be re-assessed in accordance with the applicable requirements of Rules for Hull (Pt.1, Vol.II)
Sec.6, H.6 and modified accordingly. The securing and locking arrangements for bow doors and
inner doors which may lead to the flooding of a special category space or ro-ro space as defined
in the Rules for Hull (Pt.1, Vol.II) Sec.6, H.6.1.3 are to comply with the following requirements:

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a) separate indicator lights and audible alarms are to be provided on the navigation bridge
and on each operating panel to indicate that the doors are closed and that their securing
and locking devices are properly positioned;
b) the indication panel is to be provided with a lamp test function. It is not to be possible to
turn off the indicator light;
c) the indication panel on the navigation bridge is to be equipped with a mode selection
function “harbour/sea voyage”, so arranged that audible alarm is given if the ship leaves
harbour with bow doors or inner doors not closed or with any of the securing devices not
in the correct position;
d) a water leakage detection system with audible alarm and television surveillance is to be
arranged to provide an indication to the navigation bridge and to the engine control room
of any leakage through the doors.

H. Watertightness of chain lockers

1) Application: Ships of 24 m or over in length, the keels of which are laid or which are at a similar stage
of construction on or after 1 July 2003.

2) Technical requirements: Rules for Hull (Pt.1, Vol.II) Sec.18, E is to be complied with.

I. Ice class draught mark of ships intended for navigation in ice

1. Marking of warning triangle and ice class draught
1) Application: Ships having class notations of Ice Class B1* to B3.

2) Schedule for compliance:

A) Ships constructed on or after 1 July 2007, of which the summer load line in fresh water is located
at a higher level than the upper ice waterline (UIWL), are to comply with the requirements of
this paragraph before the date of delivery.
B) Ships constructed before 1 July 2007, of which the summer load line in fresh water is located
below the upper ice waterline (UIWL), are to comply with the requirements of this paragraph
not later than the first scheduled dry docking after 1 July 2007.

3) Technical requirements: The ship’s sides are to be provided with a warning triangle and with an ice
class draught mark at the maximum permissible ice class draught amidships, in accordance with Rules
for Hull (Pt.1, Vol.II) Sec.15.

2. Documentation and certification requirements regarding ice class draught

1) Application: Ships having class notations of Ice Class B1* to B3.

2) Schedule for compliance: The requirements of this paragraph are to be complied with not later than
1 July 2007 or the date of subsequent renewal of the classification certificate.

3) Technical requirements: Rules for Hull (Pt.1, Vol.II) Sec.15.

J. Requirements for electrical distribution system including harmonic filters

1. Application: for ships contracted for construction before 1 July 2017, the electrical distribution system of
which includes harmonic filters. However, harmonic filters installed for single application frequency drives
such as pump motors may be excluded from these requirements.
2. Schedule for compliance: for ships to which 1., the due date of the first periodical survey on or after 1
July 2017.

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3. Technical requirements: as a minimum, harmonic distortion levels of main busbar on board such existing
ships are to be measured annually under seagoing conditions as close to the periodical machinery survey
as possible so as to give a clear representation of the condition of the entire plant to the surveyor.
Harmonic distortion readings are to be carried out when the greatest amount of distortion is indicated by
the measuring equipment. An entry showing which equipment was running and/or filters in service is to
be recorded in the log so this can be replicated for the next periodical survey. Harmonic distortion levels
are also to be measured following any modification to the ship’s electrical distribution system or associated
consumers by suitably trained ship’s personnel or from a qualified outside source. Records of all the above
measurements are to be made available to the surveyor at each periodical survey.

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Annex A Annexes to Section 1-3

A.1 Procedures for Confined Space Safe Entry . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
B. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
C. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
A.2 Hull Survey for New Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
A. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
B. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
C. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
D. Qualification and monitoring of personnel . . . . . . . . . . . . . . . . . . . . . . A-8
E. Survey of the hull structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
F. Review of the construction facility . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
G. New building survey planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
H. Examination and test plan for newbuilding activities . . . . . . . . . . . . . . . . A-11
I. Proof of the consistency of surveys . . . . . . . . . . . . . . . . . . . . . . . . . A-11
J. Ship Construction File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
K. Requirements for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part A-1
Regulation 3-10 (Goal-based ship construction standards for bulk carriers and oil
tankers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
A.3 The Wastage Allowance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-34
A.4 Class Requirements of Laid-Up Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
B. Safety conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-36
C. Preservation measures for lay-up and maintenance . . . . . . . . . . . . . . . . . A-37
A.5 Survey of Watertight Cable Transits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-43
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-43
B. Cable Transit Seal Systems Register . . . . . . . . . . . . . . . . . . . . . . . . . A-43
C. Installation and Maintenance of Watertight Cable Transits . . . . . . . . . . . . . A-44
A.6 Testing Procedures of Watertight Compartments . . . . . . . . . . . . . . . . . . . . . . A-45
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-45
B. SOLAS Ships (Ships Built in Compliance with SOLAS 1974 as Amended) . . . . . . . A-45
C. SOLAS Exempt/ Equivalent Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . A-54
D. Non-SOLAS Ships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-55
A.7 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-57
A.8 List of Contact Points for Changing Classification Status . . . . . . . . . . . . . . . . . . . A-66

A.1 Procedures for Confined Space Safe Entry

A. General
This annex contains the minimum requirements to help and keep Surveyors safe when conducting confined
space entry. BKI is free to take measures beyond those required in this Annex, but shall as a minimum
prescribe the requirements contained in this Annex and that they meet any relevant occupational safety
and health legislative requirements in place at locations where work is conducted.
Guidance for Marine Industry (Pt.1, Vol.AC) Sec.4.R-72 and IMO Res. A.1050(27) can be referred to for
further guidance on confined space safe entry practice. When in any doubt about the safety associated

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with the confined space, the attending surveyor has the right to refuse entry.

B. Definitions
1. Confined Space

Confined Space means a space that has any of the following characteristics:
— Limited openings for entry and exit
— Unfavourable natural ventilation
— Not intended for continuous worker occupancy

It may include, but is not limited to:

— boilers,
— pressure vessels,
— cargo spaces (cargo holds, or cargo tanks),
— enclosed cargo space access trunks ,
— ballast tanks,
— double bottoms,
— double hull spaces,
— fuel oil tanks,
— lube oil tanks,
— sewage-tanks,
— pump-rooms,
— compressor rooms,
— cofferdams,
— void spaces,
— duct keels,
— inter-barrier spaces,
— engine crankcases,
— excavations and pits.

2. Confined Space Entry (CSE)

Confined Space Entry is the process of entering, working in and exiting a confined space.

3. Competent Person

Competent person means a person with sufficient theoretical knowledge and practical experience to make
an informed assessment of the likelihood of oxygen deficient/enriched or a dangerous atmosphere being
present or subsequently arising in the space. Competent person must be trained and qualified in the
hazards of Confined Spaces and in use of atmospheric monitoring devices. The Competent Person role
may be performed by a Marine Chemist.

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4. Responsible Person

Responsible Person means a person authorized to permit entry to a confined space and having sufficient
knowledge of the procedure to be followed and other activities that are being undertaken that could impact
on the safety of those in a confined space.

5. Attendant

Attendant is a person who is suitably trained and responsible for maintaining a watch over those entering
the confined space, for maintaining communications with those inside the space and for initiating the
emergency procedures in the event of an incident occurring.

6. Marine Chemist

A Marine Chemist is a person holding a valid and suitably recognized qualification as a marine chemist or
equivalent.

7. Adjacent Space Connected Space

7.1 An adjacent space means a space that shares a common boundary with a compartment that contains
a hazardous atmosphere. Such a space has no opening or connections into the hazardous compartment
whatsoever and is a contiguous barrier. Such a space may only contain a hazardous atmosphere in the event
of the failure of that barrier.
7.2 Connected space means a space that is connected, by either permanent or intermittent means to a
source space that may contain a hazardous atmosphere. A space separated by a door shall be considered
‘connected’ as it is impossible to tell from outside the space whether it is open or not. A connected space
shall be seen as containing a hazardous atmosphere until testing proves otherwise as that atmosphere could
be trapped.

8. Hazardous Atmosphere:

A hazardous atmosphere in a confined spaces is an environment that may expose personnel to the risk of
death, incapacitation, injury, acute illness, toxicity or an inability to self-rescue. This type of atmosphere
can arise due to all or any combination of following conditions:
— Lack of natural air movement
— Oxygen-deficient environment
— Flammable environment including oxygen enrichment
— Toxic environment, and/or
— Any other hazardous atmospheric condition.

9. Surveyor

For the purpose of this Procedural Requirement a surveyor is any person employed by BKI conducting
activities within a confined space on behalf of this BKI.

10. Permit to Enter/Permit to Work

A Permit to Enter or Permit to Work is a documented authorization that has been signed and dated,
including time of issue by the Responsible Person, which states that the space has been tested by a
Competent Person and that the space is safe for entry; what precautions, equipment etc. are required
validity of the permit, and what works are to be done. The validity of the permit is not to exceed 8 hours.

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C. Requirements

The requirements are categorised in three groups.

1. Training
1.1 All Surveyors who are expected to enter and work in confined spaces shall be trained in Occupational
Safety and Health requirements for such activities. This training shall include:

— Recognizing a confined space.

— Role of the Competent Person, Responsible Person, Attendant and Marine Chemist.

— How to recognize the hazards and manage the risks associated with Confined Space Entries.

— Permit to Work (PTW) systems / control procedures at the workplace.

— Requirements for atmosphere testing and the interpretation of their results.

— Use of personal multi gas meters.

— Access, exit and safe working requirements.

— Emergency arrangements

1.2 Competency in the areas covered by the training identified in 1.1 shall be periodically assessed,
either as part of activity monitoring or some other suitable means. The maximum period between these
assessments of competency is 3 years. Appropriate refresher training shall be provided as determined
necessary from the competency assessment. The delivery mechanism for this refresher training is for the
individual societies to determine.

2. Confined Space Entry Procedure

2.1 The minimum requirements for Surveyors entry into a confined space are given as follows:

— Safe entry procedures (such as entry permit, “safe for workers” certificate, “safe for hot work”
certificate, etc.) are in place, current and are being followed.

— The Responsible and Competent Persons are identified.

— The access and exit arrangements (including Permanent Means of Access) to and within the confined
space are considered safe. Where available, multiple entry and exit ways shall be opened.

— Communications arrangements are adequate.

— The confined space is adequately clean to allow safe working.

— The confined space lighting is adequate for entry/exit and to allow safe working in a confined space.

— The atmosphere has been demonstrated as being safe (safe limits for entry are atmospheric oxygen
the range of 20,6 % to 22% by volume 1) , combustible gases not more than 1% of lower flammable
limit, toxics vapours and gases not more than 50% of the occupational exposure limits).

— Adequate ventilation arrangements are in place and functioning throughout the period the surveyors
are inside the confined space.
1)
OSHA Standard 1926.1202 stipulates, the minimum safe level of oxygen for humans in a confined space is 19,5% while
maximum is 23,5% by volume and the alarms for Personal multi-gas meters shall be set within this range. The oxygen limits 20,6%
to 22% are safe limits for ”ENTRY” inside a confined space by a surveyor. Though the personnel multi-gas meters are set at 19,5%
and 23,5% the surveyor can refuse entry inside the confined space if he/she notes that the measured entry oxygen value indicated
on the entry permit form is outside the range of 20,6% to 22% for enhancing the safety.

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— Isolation of the confined space, as applicable, from other tanks, cargo spaces, pipes, etc. and of
machinery in the space, is confirmed.

— Extreme temperature effects are adequately considered.

— Electrical equipment in the confined space is suitable and in acceptable condition.

— A dedicated Attendant is provided by the vessel’s management or the management of the facility
where the surveyor’s activities are carried out for the complete duration of the time spent working
in the confined space and the Attendant has suitable means of initiating emergency response.

— Adequate emergency response arrangements are in place and ensure that appropriate rescue
equipment is made available at the entrance of the confined space. Understanding that rescue in
a confined space can be time critical, if a confined space is such that rescue will be extremely difficult
using available equipment, surveyors shall refuse entry until the risk can be mitigated to an acceptable
level.

2.2 No surveyor shall be the first to enter a confined space, and they shall be accompanied at all times
where the size of the space permits.
2.3 Surveyor shall not enter the confined space if they are required to wear breathing apparatus.
2.4 Surveyor shall not enter the confined space if the surrounding noise can adversely impact effective
communication.
2.5 Surveyors shall not enter a confined space if other work, such as welding, blasting is being carried out.
2.6 Surveyors shall not enter cargo spaces that have cargoes that are oxygen depleting, self heating, or
emitting toxic gases.
2.7 Surveyors shall not enter compartments that have been fumigated, or adjacent / connected
compartments to those that have been fumigated, unless certified gas free by a marine chemist.
2.8 Special attention needs to be given to tanks that carry ballast water which has been treated with
chemicals.
2.9 On ships fitted with ballast water treatment system using ozone generators, surveyors shall ensure
following prior entry into ballast tanks:

— Ozone levels inside the tank must be checked (not to exceed 0,1 ppm (0,2 mg/m³)).

— Confirm that the amount of residual water inside the ballast tank is no more than the normal stripping
level.

Surveys of tanks by means of rafts or boats on such ships shall be permitted if an exchange of ballast water
has been carried out and the ballast tank contains untreated water only.
2.10 Surveyor shall not enter the confined space if hazardous atmosphere is present or suspected in an
adjacent space, and/or connected space until the following is carried out:

— A risk assessment is completed by the vessel’s Management Company and the risk is mitigated.

— All identified controls are confirmed in place prior to confined space entry.

— The atmosphere in space connected to the space being entered, if any, is checked and deemed to be
safe.

2.11 No surveyors shall not be part of a rescue team.

2.12 Surveyors shall immediately leave a confined space, by the nearest safe exit, if any alarms sound, or
any physical impairment or distress is experienced by the surveyor.

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2.13 Surveyors shall keep in mind and check the structural integrity of access and exit arrangements
(including Permanent Means of Access) inside confined spaces, especially in ballast tanks and cargo holds.
The surveyor shall refuse entry into any spaces with suspect/deficient access ladders etc. until the structural
integrity has been found satisfactory.
2.14 The vessel’s management or the management of the facility shall have established procedures for
confined space entry.
2.15 If any of minimum requirements addressed in 2.1 through 2.14 are not complied with or in any other
situation where the surveyor has a valid concern over the safety of the confined space, he/she shall refuse
entry into the confined space.
2.16 The points addressed in 2.1 through 2.14 above shall be considered as part of survey planning and
reviewed as changes occur during any Confined Space Entry.

3. Equipment for Surveyors Entering a Confined Space

3.1 The following minimum set of Personal Protective Equipment shall be made available by BKI to its
Surveyors for conducting a Confined Space Entry:

— Protective clothing

— Safety shoes/boots

— Hard hat

— Work gloves

— Protective glasses and/or goggles

— Ear defenders and/or ear plugs

— An individual multi gas meter, in good working order, serviced and calibrated as per the
manufacturer’s instructions

— A flashlight, appropriate to the nature of the confined space to be entered, and in good working order

3.2 The Surveyors must always use the necessary personal protective equipment according to the specific
conditions and the survey being carried out.

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A.2 Hull Survey for New Construction

A. Scope
The scope of this Annex includes the following main activities:
1. Examination of the parts of the ship covered by classification rules and by applicable statutory
regulations for hull construction, to obtain appropriate evidence that they have been built in compliance
with the rules and regulations, taking account of the relevant approved drawings.
2. Appraisal of the manufacturing, construction, control and qualification procedures, including welding
consumables, weld procedures, weld connections and assemblies, with indication of relevant approval
tests.
3. Witnessing inspections and tests as required in the classification rules used for ship construction
including materials, welding and assembling, specifying the items to be examined and/or tested and how
(e.g. by hydrostatic, hose or leak testing, non destructive examination, verification of geometry) and by
whom.
4. Appraisal of material and equipment used for ship construction and their inspection at works is not
included in this Annex. Details of requirements for hull and machinery steel forgings and castings and for
normal and higher strength hull structural steel are given in Rules for Materials (Pt.1, Vol.V), Sec. 6, 7
and 4, B respectively. Acceptance of these items is verified through the survey process carried out at the
manufacturer’s works and the issuing of the appropriate certificates.
5. In addition to above, for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part A-1 Regulation
3-10 (Goal-based ship construction standards for bulk carriers and oil tankers), see also K.

B. Definitions2)
1. The hull structure is defined as follows:

— hull envelope including all internal and external structures;

— superstructures, deckhouses and casings;

— welded foundations, e.g. main engine seatings;

— hatch coamings, bulwarks;

— all penetrations fitted and welded into bulkheads, decks and shell;

— the fittings of all connections to decks, bulkheads and shell, such as air pipes and ship side valves

— all ILLC 1966, as amended, items;

— welded attachments to shell, decks and primary members, e.g. crane pedestals, bitts and bollards,
but only as regards their interaction on the hull structure.

2. Reference to documents also includes electronic transmission or storage.

3. Definition of survey methods which the surveyor is directly involved in: Patrol, Review, Witness.
3.1 Patrol, the act of checking on an independent and unscheduled basis that the applicable processes,
activities and associated documentation of the shipbuilding functions identified in Table A.2.1 continue to
conform to classification and statutory requirements.
3.2 Review, the act of examining documents in order to determine traceability, identification and to
confirm that processes continue to conform to classification and statutory requirements.
2)
Terminology for hull terms and hull survey terms can be found in Guidance for Marine Industry (Pt.1, Vol.AC) Sec.5.R-82.

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3.3 Witness is the attendance at scheduled inspections in accordance with the agreed Inspection and Test
Plans to the extent necessary to check compliance with the survey requirements.

C. Applications
1. This Annex covers the survey of all new construction of steel ships intended for classification and for
international voyages except for:

— those defined in SOLAS I/3;

— high speed craft as defined in I/1.3.1 of the 2000 High Speed Craft Code;

— Mobile Offshore Drilling Units as defined in I/1.2.1 of the MODU Code.

2. This Annex covers all statutory items, relevant to the hull structure and coating, i.e. Load Line and
SOLAS Safety Construction.
3. This Annex does not cover the manufacture of equipment, fittings and appendages regardless whether
they are made inside or outside of the shipyard, examples being as follows. Evidence of acceptance shall be
provided by accompanying documentation from class surveyor at manufacturer and verified at the shipyard:

— hatch covers;

— doors and ramps integral with the shell and bulkheads;

— rudders and rudder stock;

— all forgings and castings integral to the hull.

4. This Annex applies to the installation into the ship, welding and testing of:
4.1 the items listed in 3. above;
4.2 equipment forming part of the watertight and weather tight integrity of the ship.
5. This Annex applies to the hull structures and coating constructed at any of the following:
5.1 shipbuilder’s facilities;
5.2 sub-contractors at the shipbuilder’s facilities;
5.3 sub-contractors at their own facilities or at other remote locations.

D. Qualification and monitoring of personnel

1. Exclusive surveyors of BKI are to confirm through patrol, review and witness as defined in B.3, that the
ships are built using approved plans in accordance with the relevant rules and statutory requirements. The
surveyors are to be qualified to be able to carry out the tasks.
2. BKI is to establish and implement relevant management procedures to ensure that the activities of the
Surveyors are monitored.

E. Survey of the hull structure

1. Table A.2.1 provides a list of surveyable items for the hull structure and coating covered by this Annex,
including:
1.1 description of the shipbuilding functions;
1.2 classification and statutory survey requirements;
1.3 survey method required for classification;
1.4 relevant IACS and statutory requirement references;

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1.5 documentation to be available for the classification surveyor during construction.

1.5.1 The shipbuilder is to provide the classification surveyors access to documentation required by
classification, this includes documentation retained by the shipbuilder or other third parties.
1.5.2 The list of documents approved or reviewed by BKI for the specific new construction are as follows:
— plans and supporting documents
— examination and testing plans
— NDE plans
— welding consumable details
— welding procedure specifications
— welding plan or details
— welder’s qualification records
— NDE operator’s qualification records
1.6 Documents to be inserted into the ship construction file. Refer to Sub-section J. for details.
1.7 A list of specific activities which are relevant to the shipbuilding functions. This list is not exhaustive
and can be modified to reflect the construction facilities or specific ship type.
2. Evidence is also to be made available, as required, by the shipbuilder, to the surveyor whilst the
construction process proceeds to prove that the material and equipment supplied to the ship has been
built or manufactured under survey relevant to the classification rules and statutory requirements.

F. Review of the construction facility3)

1. The Surveyor is to familiarize themselves with the yard’s production facilities, management processes,
and Safety for consideration in complying with the requirements of Table A.2.1 prior to any steelwork or
construction taking place in the following circumstances:
1.1 where surveyor has none or no recent experience of the construction facilities – typically after a one
year lapse - or when significant new infrastructure has been added;
1.2 where there has been a significant management or personnel re-structuring having an impact on the
ship construction process;
1.3 or where the shipbuilder contracts to construct a vessel of a different type or substantially different
in design.

G. New building survey planning

1. Prior to commencement of surveys for any newbuilding project, BKI is to discuss with the shipbuilder
at a kick off meeting the items listed in Table A.2.1. The purpose of the meeting is to review and agree how
the list of specific activities shown in Table A.2.1 is to be addressed. The meeting is to take into account the
shipbuilder’s construction facilities and ship type including the list of proposed subcontractors.
A record of the meeting is to be made, based upon the contents of the Table A.2.1 – the Table can be used
as the record with comments made into the appropriate column. If BKI has nominated a surveyor for a
specific newbuilding project then the surveyor is to attend the kick off meeting.
The builder should agree to undertake ad hoc investigations during construction as may be requested by
Class where areas of concern arise and the builder to agree to keep BKI advised of the progress of any
investigation. Whenever an investigation is undertaken, the builder is to be requested, in principle, to
agree to suspend relevant construction activities if warranted by the severity of the problem.
3)
Reference is made to Table A.2.2 as an example.

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

2. The records are to take note of specific published Administration requirements and interpretations of
statutory requirements.
3. The shipyard shall be requested to advise of any changes to the activities agreed at the kick off
meeting and these are to be documented in the survey plan. e.g. if the shipbuilder chooses to use
or change sub-contractors, or to incorporate any modifications necessitated by changes in production
or inspection methods, rules and regulations, structural modifications, or in the event where increased
inspection requirements are deemed necessary as a result of a substantial non-conformance or otherwise.
4. Shipbuilding quality standards for the hull structure during new construction are to be reviewed
and agreed during the kick-off meeting. Structural fabrication is to be carried out in accordance with
Guidance for Marine Industry (Pt.1, Vol.AC) Sec.3.R-47, “Shipbuilding and Repair Quality Standard”, or a
Recognized Fabrication Standard (RFS) which has been accepted by BKI prior to the commencement of
fabrication/construction. The work is to be carried out in accordance with the Rules and under survey of
BKI.
BKI may accept an RFS as an alternative to Guidance for Marine Industry (Pt.1, Vol.AC) Sec.3.R-47 provided
that 4.1 or 4.2 is complied with as applicable.
4.1 Where a RFS is well established and has well documented history (3 or more years prior to the new
ship contract) of successful application to similar designs as the new ship and that history is for the same
Shipyard as the new ship. Then the Shipyard is to create a summary document referencing the RFS to be
used in construction and highlighting any limitations to usage of the selected RFS. This summary document
is to be included with the “record of kick-off meeting” for the ship.
The summary document is also to be included in the SCF, (for Tankers and Bulk Carriers subject to SOLAS
Chapter II-1 Part A-1 Regulation 3-10 refer to Rules for Oil Tanker and Bulk Carriers (Pt.1, Vol.XVII.A), Table
3.3 Tier II Item 11), as applicable.
4.2 Where a RFS is new or revised or otherwise not as per 4.1 the following steps are to be carried out:

1) The tolerances and fabrications standards of the RFS are to be compared with those of Guidance
for Marine Industry (Pt.1, Vol.AC) Sec.3.R-47. Any that are less stringent than those of Guidance for
Marine Industry (Pt.1, Vol.AC) Sec.3.R-47 are to be identified.

2) The tolerances and fabrication standards of the RFS identified in 1) are to be assessed to determine
the acceptability for use and/or any restrictions for usage for the subject (or proposed) design. Details
of how the acceptability for use and/or restrictions are to be recorded, and,

3) A summary document including the outcomes of 1) and 2) is to be compiled. This document is to

also include a reference to the RFS, details of the tolerance and fabrication standards not analysed
as part of 2) and any limitations to the usage of the RFS.

The summary document is to be included with the “record of the kick-off meeting” of the ship. The summary
document is also to be included in the SCF, (for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part
A-1 Regulation 3-10 refer to Rules for Oil Tanker and Bulk Carriers (Pt.1, Vol.XVII.A), Table 3.3 Tier II Item
11), as applicable.
5. The kick-off meeting may be attended by other parties (owner, administrations, etc.) subject to
agreement by the shipbuilder.
6. In the event of series ship production4) , the requirement for a kick off meeting in 1. may be waived for
the second and subsequent ships provided that no changes to the specific activities agreed in the kick off
meeting for the first ship are introduced. If any changes are introduced, these are to be agreed in a new
dedicated meeting and documented in a record of such meeting.
4)
Series Ship Production: vessels in the series subsequent to the first one (prototype), i.e. sister ships built in the same shipyard.

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

H. Examination and test plan for newbuilding activities

1. The shipbuilder is to provide plans of the items which are intended to be examined and tested. These
plans need not be submitted for approval and examination at the time of the kick off meeting. They are to
include:
1.1 proposals for the examination of completed steelwork - generally referred to as the block plan and
are to include details of joining blocks together at the pre-erection and erection stages or at other relevant
stages;
1.2 proposals for fit up examinations where necessary;
1.3 proposals for testing of the structure (leak and hydrostatic) as well as for all watertight and
weathertight closing appliances;
1.4 proposals for non-destructive examination;
1.5 any other proposals specific to the ship type or to the statutory requirements.
2. The plans and any modifications to them are to be submitted to the surveyors in sufficient time to allow
review before the relevant survey activity commences.
3. In addition to above, for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part A-1 Regulation
3-10 see also K.1.

I. Proof of the consistency of surveys

1. BKI is to be able to provide evidence, e.g. through records, check lists, inspection and test records,
etc. that its surveyors have complied with the requirements of the newbuilding survey planning and duly
participated in the relevant activities shown in the shipbuilder’s examination and test plans.
2. In addition, BKI is to maintain records of deficiencies found during the patrolling activities required in
Table A.2.1 and described in B.3.1.
Records shall include the date when deficiency was found, description of the deficiency and the date the
deficiency was cleared.

J. Ship Construction File

1. The purposes of this requiremenrts are applicable to all ships except the Tankers and Bulk Carriers
subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10 for which the K.3 is to be applied. The shipbuilder is
to deliver documents for the Ship Construction File. In the event that items have been provided by another
party such as the shipowner and where separate arrangements have been made for document delivery
which excludes the shipbuilder, that party has the responsibility.
The Ship Construction File shall be reviewed for content in accordance with the requirements 2.
2. It is recognised that the purpose of documents held in the Ship Construction File on board the ship,
is to facilitate inspection (survey) and repair and maintenance, and, therefore, is to include in addition to
documents listed in Table A.2.1, but not be limited to:
2.1 As-built structural drawings including scantling details, material details, and, as applicable, wastage
allowances, location of butts and seams, cross section details and locations of all partial and full penetration
welds, areas identified for close attention and rudders (Refer to Section 3 and 4);
2.2 Manuals required for classification and statutory requirements, e.g. loading and stability, bow doors
and inner doors and side shell doors and stern doors – operations and maintenance manuals (Refer to Rules
for Hull (Pt.1, Vol.II), Sec. 6, H and J);
2.3 ship structure access manual, as applicable;
2.4 copies of certificates of forgings and castings welded into the hull (Refer to Rules for Materials (Pt.1,
Vol.V), Sec. 6 and 7);

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

2.5 details of equipment forming part of the watertight and weather tight integrity of the ship;
2.5.1 Cable Transit Seal Systems Register (Register), to be prepared by the shipbuilder for watertight
cable transits. The Register can be in either a hard copy or digitized media. For an example of a register
see Annex A.5, Table A.5.1. It is to include a marking/identification system, documentation referencing
manufacturer manual(s) for each type of cable transit installed, the Type Approval certification for each type
of transit system, applicable installation drawings, and a recording of each installed transit documenting the
as built condition after final inspection in the shipyard. This is to include sections to record any inspection,
modification, repair and maintenance
2.6 tank testing plan including details of the test requirements (Refer to Annex A.6);
2.7 corrosion protection specifications (Refer to Rules for Hull (Pt.1, Vol.II), Sec. 38, F and G.1.1);
2.8 details for the in-water survey, if applicable, information for divers, clearances measurements
instructions etc., tank and compartment boundaries;
2.9 docking plan and details of all penetrations normally examined at drydocking;
2.10 Coating Technical File, for ships subject to compliance with the IMO Performance Standard for
Protective Coatings (PSPC) as a class requirement under Rules for Bulk Carrier and Oil Tanker (Pt.1, Vol.XVII)

K. Requirements for Tankers and Bulk Carriers subject to SOLAS Chapter II-1 Part A-1
Regulation 3-10 (Goal-based ship construction standards for bulk carriers and oil tankers)
1. Examination and test plan for newbuilding activities
The shipbuilder is to provide plans of the items which are intended to be examined and tested in accordance
with BKI Rules in a document known as the Survey Plan, taking into account the ship type and design. This
Survey Plan shall be reviewed at the time of the kick off meeting, and must include:
1.1 A set of requirements, including specifying the extent and scope of the construction survey(s) and
identifying areas that need special attention during the survey(s), to ensure compliance of construction
with mandatory ship construction standards including:

1) Types of surveys (visual, non-destructive examination, etc.) depending on location, materials,

welding, casting, coatings, etc.

2) Establishment of a construction survey schedule for all assembly stages from the kick-off meeting,
through all major construction phases, up to delivery.

3) Inspection/survey plan, including provisions for critical areas identified during design approval.

4) Inspection criteria for acceptance.

5) Interaction with shipyard, including notification and documentation of survey results.

6) Correction procedures to remedy construction defects.

7) List of items that would require scheduling or formal surveys.

8) Determination and documentation of areas that need special attention throughout ship’s life,
including criteria used in making the determination.

1.2 A description of the requirements for all types of testing during survey, including test criteria.

2. Design Transparency
For ships subject to compliance with IMO Res. MSC.287(87), IMO Res. MSC.290(87), IMO Res.
MSC.454(100) and IMO MSC.1/Circ.1343, readily available documentation is to include the main goal-based
parameters and all relevant design parameters that may limit the operation of the ship.

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

3. Ship Construction File (SCF)

Refer to Rules for Oil Tanker and Bulk Carriers (Pt.1, Vol.XVII.A), Sec. 3, C.

4. Determination of number of Surveyor(s)

BKI will assign adequate number of suitable qualified surveyor(s) for newbuilding projects according to the
construction progress of each ship to meet appropriate coverage of the examination and testing activities
as agreed in the Survey Plan.

Biro Klasifikasi Indonesia - January 2025 Edition Page A-13

 Table A.2.1 Hull Surveyable Items Activities
Ref. Shipbuilding Survey Survey Method IACS BKI reference Statutory Documentation Documentation Specific activities Classification
function Requirements for required for requirements and available to for ship society

Page A-14
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
shipbuilding
quality control
function
Pt 1 Seagoing Ships

1 welding
Classification review approval Rules for Welding consumable Identify
welding
1.1 approved status and patrol, (Pt.1, Vol.VI), Sec. specification and not required consumables
consumables
separately at the verify storage, 5 approval status against approved
manufacturer handling and list
treatment in verify temporary e.g. kept dry,
Annex A Annexes to Section 1-3

accordance with and permanent covered,

manufacturer’s storage facilities where
requirements applicable
Vol I Rules for Classification and Surveys

heated
verify traceability e.g. random
batch
number
checking
review of welder Guidance for shipyards records verify welder
welder
1.2 certification and Marine Industry with individual’s not required qualification
qualification
patrol (Pt.1, Vol.AC) identification standard, e.g.
Sec.3.R-47 class or
recognised
standard
approval
verify welder
approved for
weld position
verify validity of
qualification
certificate
1.3 Welding - All weld joint review and patrol Rules for Welding Approved weld not required verify procedures
mechanical configurations, (Pt.1,Vol.VI), Sec. procedure are available at
properties positions and 12, F specification and relevant
(welding materials to be welding plan workstations
procedures) covered by weld relevant to the ship
procedures project or process
approved by the
classification
society or by
another IACS
member available
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
the classification witness verify weld
society witnesses procedures
all new weld records have
procedure been approved
Pt 1 Seagoing Ships

qualification tests and cover all

carried out in the weld processes
shipyard whenever and positions in
the classification accordance with
society is surveying classification or
in the shipyard recognised
Annex A Annexes to Section 1-3

standards and
are available for
the surveyors
reference
Vol I Rules for Classification and Surveys

shipbuilders not required verify condition

Welding correctly calibrated maintenance and of machinery and
1.3a patrol and review

Biro Klasifikasi Indonesia - January 2025 Edition

equipment and maintained calibration records equipment.
verify machines
are calibrated by
appropriate staff
verify calibration
carried out in
accordance with
manufacturer’s
recommendations
verify calibration
in accordance
with
maintenance
schedule
Guidance for Verify welding
Welding satisfactory
1.3b patrol Marine Industry not required areas clean, dry,
environment environment
(Pt.1, Vol.AC) well lit.
Sec.3.R-47 Confirm relevant
measures taken
for any pre or
post heat
treatment,
drying of
surfaces prior to
welding
A.2

Page A-15
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-16
surveyor during for the
construction project
Confirm shielding
gases, fluxes
protected
1.3c welding sufficient number Review and patrol Rules for Welding verify
Pt 1 Seagoing Ships

supervision of skilled (Pt.1, Vol.VI), Sec. supervision is

supervisors 10 and Guidance effective
for Marine
Industry (Pt.1,
Vol.AC) Sec.3.R-47
Substantially free visual examination. Rules for Welding Shipbuilders and not required Identify
Annex A Annexes to Section 1-3

from significant surface detection (Pt.1, Vol.VI), Sec. recognised workstations

welding-surface
1.4 indications, techniques, review 10 and Guidance standards and Rules where NDE is
discontinuities
satisfactory profile of documents and for Marine as applicable, carried out, e.g.
and size patrol of operator Industry (Pt.1, welding and NDE panel line butt
Vol I Rules for Classification and Surveys

Vol.AC) Sec.3.R-47 plans, NDE reports, welds, castings

operator into hull
qualifications structure
Verify NDE
carried out in
accordance with
approved plans
where applicable
Verify suitability
of NDE methods
Verify operators
suitably qualified
particularly
where
sub-contractors
have been
employed
Verify NDE is
carried out
according to the
acceptable
process
Review NDE
records
A.2

Biro Klasifikasi Indonesia - January 2025 Edition

 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
1.5 Welding - NDE is to be Radiography and Rules for Welding Shipbuilders and not required Identify
embedded carried out by ultrasonic testing, (Pt.1, Vol.VI), Sec. recognised workstations
discontinuities qualified operators review of 10 and Guidance standards and where NDE is
capable of documents and for Marine Rules as carried out, e.g.
Pt 1 Seagoing Ships

ensuring that patrol of operator, Industry (Pt.1, applicable, welding panel line butt
welds are examination of Vol.AC) Sec.3.R-47 and NDE plans, welds, castings
substantially free films NDE reports, into hull
from significant operator structure
indications qualifications Verify NDE
carried out in
Annex A Annexes to Section 1-3

accordance with
approved plans
where applicable
Verify suitability
Vol I Rules for Classification and Surveys

of NDE methods
Verify operators

Biro Klasifikasi Indonesia - January 2025 Edition

suitably qualified
particularly
where
sub-contractors
have been
employed
Verify that
records have
been completed
and in
accordance with
recognised
standards, e.g.
IQI and
sensitivity
recorded
Verify that
reports and
radiographs have
been evaluated
correctly by the
shipbuilder.
Systematic
review of
radiographs
carried out by
the surveyor
A.2

Page A-17
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-18
surveyor during for the
construction project
Verify equipment
calibration
satisfactory and
in accordance
Pt 1 Seagoing Ships

with
manufacturers
and recognised
standards
requirements
Verify NDE is
Annex A Annexes to Section 1-3

carried out
according to the
acceptable
process
Vol I Rules for Classification and Surveys

2 Steel
preparation and
fit up :
2.1 surface traceability and patrol Guidance for material certificates, not required Verify stockyard
preparation acceptability of Marine Industry shipbuilder’s storage
marking and material, check of (Pt.1, Vol.AC) marking/cutting satisfactory
cutting steel plates & Sec.3.R-47 production Verify material
profiles materials documents at the traceability, e.g.
type, scantling workstage stamping
identification, documents retained identification
testing marks at the facility against material
certification,
archiving of
records
Verify transfer
marking after
treatment line
Verify standard
of shotblasting
and priming
Verify suitability
of primer
Verify that steel
grades can be
identified
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
Verify machinery
adjusted to
maintain within
IACS or
Pt 1 Seagoing Ships

manufacturers
recommendations.
Verify accuracy
of marking and
cutting
Verify storage of
Annex A Annexes to Section 1-3

piece parts.
2.2 straightening Approval of patrol and review Guidance for recognised not required Verify that
straightening Marine Industry standards, approved straightening
methods/ (Pt.1, Vol.AC) procedures processes are
Vol I Rules for Classification and Surveys

procedures against Sec.3.R-47 approved for the

deformation grade and type of

Biro Klasifikasi Indonesia - January 2025 Edition

steel, e.g. tmcp,
z plate.
Verify that plates
and sections are
within
recognised
tolerances
2.3 forming Maintain material patrol Guidance for Shipbuilders not required Verify that
properties. Marine Industry procedure for hot temperature
Acceptance of (Pt.1, Vol.AC) forming control is
forming method Sec.3.R-47 exercised by the
against unproper operator.
deformations
Verify that
suitable methods
of temperature
control are
available when
forming special
steels and
materials
Verify that
forming
processes are
acceptable
A.2

Page A-19
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-20
surveyor during for the
construction project
2.4 conformity with Check patrol Guidance for Shipbuilders and not required Verify the
alignment/fit alignment/fit Marine Industry recognised processes to
up/gap criteria up/gap against (Pt.1, Vol.AC) standards and Rules ensure
reference Sec.3.R-47 as applicable, satisfactory fit up
Pt 1 Seagoing Ships

standards and alignment at

all workstations
Verify that edge
preparations are
re- instated
where lost during
Annex A Annexes to Section 1-3

fitting operations
Verify remedial
procedures are in
place to
Vol I Rules for Classification and Surveys

compensate for
wide gaps and
alignment
deviations
2.5 conformity for Check witness and review Guidance for Shipbuilders and Approved plans Verify that the
critical areas, alignment/fit Marine Industry recognised of critical areas if information
when defined, up/gap against (Pt.1, Vol.AC) standards and Rules applicable relevant to the
with approved drawings Sec.3.R-47 as applicable, latest approved
alignment/fit up approved plan or drawings is
or weld standard, builder’s available at the
configuration records workstations
Verify the
processes to
ensure
satisfactory fit up
and alignment at
all workstations
Verify that edge
preparations are
re- instated
where lost during
fitting operations
Verify remedial
procedures are in
place to
compensate for
wide gaps and
alignment
deviations
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
3 Steelwork compliance with patrol of the Guidance for approved plans, Verify that the
process, e.g. approved process and MarineIndustry shipbuilders information
sub drawings, visual witness of the (Pt.1, Vol.AC) inspection records, relevant to the
assembly, examination of completed item Sec.3.R-47 Shipbuilders and latest approved
Pt 1 Seagoing Ships

block, grand welding and recognised drawings is

and mega material, check standards and available at the
block alignment and Rules as workstations
assembly, deformations applicable, Verify that
pre-erection construction plan correct weld
and (steelwork sizes have been
Annex A Annexes to Section 1-3

erection, sub-division) adopted

closing Verify operation
plates of the welding
processes at the
Vol I Rules for Classification and Surveys

different work
stages is

Biro Klasifikasi Indonesia - January 2025 Edition

satisfactory
Verify that piece
parts are
identifiable
Verify that fit ups
are within
recognised
tolerances
Verify that
correct welding
requirements
specified in
reference 1 of
this table have
been adopted
Verify processes
for closing plates
etc. are
acceptable
Confirm that
steelwork is in
accordance with
the approved
plan
A.2

Page A-21
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-22
surveyor during for the
construction project
4 Remedial work welding, check review records and Guidance for permanent record of Verify that
and alteration against witness Marine Industry shipyard surveyable records have
deformation, (Pt.1, Vol.AC) item been maintained
alignment Sec.3.R-47 of significant
Pt 1 Seagoing Ships

deviations from
the approved
plans, for
situations such as
mis cut openings,
re-routing outfit
Annex A Annexes to Section 1-3

items
Verify that all
deviations
brought to the
Vol I Rules for Classification and Surveys

attention of the
classification
society by the
shipbuilder are
acceptable
5 Tightness Absence of leaks Review and Annex A.6 Reg. II-1/11 of approved tank approved tank Confirm that
testing, including witness of the test SOLAS as testing plan, testing plan tank testing is
leak and hose amended; shipbuilders carried out in
testing, inspection records accordance with
hydropneumatic the approved
testing plan
Confirm the
methods used to
carry out leak
testing
Confirm that
correct test
pressures
maintained for
leak, hose and
hydro and
hydropneumatic
testing is
satisfactory
Verify that adequate records
of the tank testing have been
maintained
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
6 Structural testing structural Review and Annex A.6 Reg, II-1/11 of approved tank approved tank Confirm that
adequacy of the witness of the test SOLAS as testing plan, testing plan tank testing is
design amended; shipbuilders carried out in
inspection records accordance with
Pt 1 Seagoing Ships

the approved
plan
Confirm that
correct test
pressures
maintained for
Annex A Annexes to Section 1-3

testing is
satisfactory
Verify that
adequate records
Vol I Rules for Classification and Surveys

of the tank
testing have

Biro Klasifikasi Indonesia - January 2025 Edition

been maintained
7 corrosion Salt water ballast Review and report Rules for Hull (Pt.1, Reg. II-1/3-2 of manufacturer’s and corrosion Verify that
protection tanks with on builder’s & Vol.ll), Sec. 24A.10, SOLAS as amended builder’s protection applied coatings
systems, e.g. boundaries formed manufacturer’s 38.F and G.I.I and specification specifications are approved and
coatings, by the hull documentation Guidelines for review records of
cathodic envelope, and also Code and application
protection, bulk carrier hold Convention
impressed internal surfaces, Interpretation
current except coamings and (Pt.1, Vol.Y), Sec.
for coating hatch covers shall 11, SC
system subject have an efficient
to PSPC protective coating.
Safety aspects of
cathodic systems
to be dealt with
separately.
Verify that
adequate records
have been
maintained and
copied to the
ship construction
file
A.2

Page A-23
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-24
surveyor during for the
construction project
Application Review AFS Convention Painting Paint Verify that
Antifouling Specification Specification and adequate records
Systems Mfg Declaration have been
maintained and
Pt 1 Seagoing Ships

copied to the
ship construction
file
7.1 Application of monitor Patrolling and Guidelines for Reg. II-1/3-2 of Signed and Verified Coating Technical Verify that
Protective implementation of Review Code and SOLAS as Tripartite Agreement File applied coatings
Coatings for the coating Convention amended; are approved and
Annex A Annexes to Section 1-3

Dedicated inspection Interpretation review records of

Seawater Ballast requirements (Pt.1, Vol.Y), Sec. application in
Tanks in all Types 11, SC 223 accordance with
of Ships and Chapter 7 of
Vol I Rules for Classification and Surveys

Double-Side Skin Annex to

Spaces of Bulk MSC.21S(82).
8 Installation,
welding and
testing of the
following:
8.1 hatch covers tightness and witness Annex A.6 and Reg. 13-14-15 and approved tank details required, Confirm leak test
securing Rules for Hull (Pt.1, 16 of ILLC’66 testing plan, structural of hatch covers
Vol.II), Sec. 17.B.6 shipbuilders drawings
inspection records
Confirm
operation and
securing test
8.2 doors and ramps tightness and witness Annex A.6 Reg. II-1/18 of approved tank details required Confirm leak test
integral with the securing SOLAS as testing plan,
shell and amended; Reg. 12 shipbuilders
bulkheads and 21 of ILLC ’66 inspection records
Confirm
operation and
securing test
Confirm safety
device operation
Ensure correct
maintenance
logs/manuals
supplied with the
ship construction
file
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
8.3 rudders fitting witness Annex A.6 approved plan, details required, Confirm
shipbuilders structural alignment and
inspection records drawings mounting and
fitting up to the
Pt 1 Seagoing Ships

connection to
the tiller
Confirm function
test
Verify fitting of
pintles and all
Annex A Annexes to Section 1-3

securing bolts
Verify all fit up
records including
all clearances
Vol I Rules for Classification and Surveys

maintained and
placed into ship

Biro Klasifikasi Indonesia - January 2025 Edition

construction file
8.4 forgings and compliance with patrol of the Rules for Materials approved plans, copies of Verify casting
castings approved process and (Pt.1, Vol.V), Sec. 6 shipbuilders certificates of and forgings
drawings, visual witness of the and 7 inspection records, forgings and against material
examination of completed item Shipbuilders and castings certificate
welding and recognised
material, check standards and Rules
alignment and as applicable,
deformations construction plan
(steelwork
sub-division)
Verify that
correct welding
and fit up
requirements
specified in
reference 1, 2.4
and 2.5 of this
table have been
adopted
Verify that
material
certificates are
included in the
ship construction
file
A.2

Page A-25
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-26
surveyor during for the
construction project
appendages Verify that
correct welding
and fit up
requirements
Pt 1 Seagoing Ships

specified in
reference 1, 2.4
and 2.5 of this
table have been
adopted
8.5 equipment tightness and Witness Guidance for the Reg. II-1/16 and approved tank details required Verify that
Annex A Annexes to Section 1-3

forming the securing Approval and Type Reg. II- 1/16-1 of testing plan, correct welding
watertight and Approval of SOLAS as shipbuilders and fit up
weathertight Materials and amended; Reg. inspection records requirements
integrity of the Manufactures 17-18-19-20-22-23 specified in
Vol I Rules for Classification and Surveys

ship, e.g. (Pt.1, Vol.W), Sec. of ILLC ’66 reference 1, 2.4

overboard 3, R and 2.5 of this
discharges, air table have been
pipes, ventilators adopted
Verify
Compliance with
Load line
Convention 1966
as amended - i.e.
all fittings in
accordance with
the record of
freeboard
assignment
Verify air pipes,
vents etc closing
device are
approved type
Verify material
certificates for
overboard
discharges where
applicable
A.2

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 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals
surveyor during for the
construction project
Verify record of
freeboard
assignment and
all material
Pt 1 Seagoing Ships

certificates
included in the
ship construction
file
Freeboard marks Within allowable witness Guidance for the Reg. 4-5-6-7 and 8 details required Verify freeboard
and draft marks tolerances and in Approval and Type of ILLC’66 marks in
Annex A Annexes to Section 1-3

accordance with Approval of accordance with

the freeboard Materials and load line
assignment Manufactures assignment
(Pt.1, Vol.W), Verify draft
Vol I Rules for Classification and Surveys

Sec.3, R marks in
accordance with

Biro Klasifikasi Indonesia - January 2025 Edition

the agreed
tolerances
specified by the
builder unless
more onerous
flag state
requirements
Principal within allowable review and witness Guidance for details required Verify principal
dimensions tolerances Marine Industry dimensions in
(Pt.1, Vol.AC) accordance with
Sec.3.R-47 recognised
standard
Verify
dimensions
included in ship
construction file
Safety no outstanding witness Reg. I/7 or Reg. Verify that
Construction imperfections or I/10 of SOLAS as Administration
Certification defects amended, as requirements
appropriate have been
incorporated into
the hull structure
A.2

Page A-27
 Table A.2.1: Hull Surveyable Items Activities (continued)
Ref. Shipbuilding Survey Survey Method IACS / BKI Statutory Documentation Documentation Specific activities Classification
function Requirements for required for reference requirements and available to for ship society
Classification Classification relevant reference classification construction file proposals

Page A-28
surveyor during for the
construction project
8.6 Watertight cable compliance with patrol of the Reg. II-1/13 and shipbuilder’s Cable Transit Seal Verify that
transit seal approved process and 13-1 of SOLAS as inspection records, systems Register correct welding
systems drawings, visual witness of the amended manufacturer’s and fit up
examination of completed item specification requirements,
Pt 1 Seagoing Ships

fitting. check including as

alignment and specified in
securing reference 1, 2.4
and 2.5 of this
table have been
adopted
Annex A Annexes to Section 1-3

Verity watertight
cable transit seal
systems are type
approved.
Vol I Rules for Classification and Surveys

Verify the format

and content of
the Register.

Shipbuilder’s name
project
project duration
kick off meeting date
representing builder
representing class society
* IACS Recommendations are not mandatory requirements.
A.2

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

Table A.2.2 Shipyard Review Record

Name of Shipyard Date

1. Details of any Management Systems

Obtained Approval Certified by Expiry Date Remarks (scope,ect)

ISO-9001
ISO 14001
ISO 45001
Other:

2. Construction facilities:
Document such as a brochure of shipyard can be attached in lieu of completing this section.
2.1 Building Berth (B) or Dock (D)

Length Width Depth* Building Capacity Crane

B/D Name
(m) (m) (m) (Gross Tonnage) (Ton x No.)

*In case of berth, Depth is not applicable

2.2 Outfitting Quays

Length Width Depth* Berthing Capacity Crane

Name
(m) (m) (m) (Gross Tonnage) (Ton x No.)

2.3 Main Fabrication and erection facilities

2.3.1 Main and cutting of steel plates (including internal member)

- Marking method (Manual, Photo x , EPM x , NC x others )

- NC cutting machine (Gas x , Plasma x , Lasser x )
Control procedure of NC (On-line, other)
- Cutting equipment (Edge planer x , Roll-share x )

2.3.2 Marking and cutting of section bar

- Marking method ( Manual, NC ) - Marking of reference curved line ( Manual, NC )

- Cutting method ( Manual, NC ) - In case of NC (Gas x , Plasma x )

2.3.3 One-side automatic welding machine (Yes, No)

- Type of welding machine (Flux Backing x , Flux and Copper Backing x other )
- Existence of special surface plate for plate welding (Yes, No)

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

2.3.4 Fillet welding machine

Fillet welding machine (Gravity, Automatic) Percentage of automatization except gravity : about %
- Line welder (No, Yes: submarged arc x heads, CO2 x heads)
- Small automatic fillet welding machine (No, Yes: Name: x )
- Welding robot (No, Yes: Portal x , Rectangular x , Articulated X )

2.3.5 Painting equipment

- Plate shot blasting/primer coating machine ( No, Yes: Max. Width m, Length m)
- Section bar shote ( No, Yes: Max. Length m)
- Special coating factory ( No, Yes: mx mx sections )

2.3.6 Vertical automatic welding machine

Vertical automatic welding machine ( No, Yes: EG x , SEG x , ES x )

EG : Electrogas SEG : Simplified Electrogas ES : Electroslag

2.3.7 Other main fabrication facilities

3. Shipyard control of Qualified Welders

(1) Normal Steel

maintenance
certification traceability supervision
of qualification
Shipyard worker confirm system in place Yes / no Yes / no Yes / no Yes / no
Subcontracted workers confirm system in place Yes / no Yes / no Yes / no Yes / no

4. Feature of Construction Procedure

(1) Subcontract of hull block (weigth)

- Sub members (No, Yes: Ratio of subcontracted works %, No., of subcontructors )
- Block (No, Yes: Ratio of subcontracted works %, No., of subcontructors )
(2) Method of plate block assembly
- Method fitting and welding longitudinals and transverse webs on jointed panels
- Method welding longitudinal on jointed panels prior to fitting and welding transverse webs
- Method fitting and welding a frame consists of longitudinals and transverse webs on jointed panels
- Method jointning panels with pre-assembled longitudinals by welding prior to fitting and welding
transverse webs
- Other (please specify in (5) below)
(3) pre-erection outfitting carried out
grand block/mega block adopted
Method of erection at building berth/dock
- Max. Weight of loading block : ton
- Construction method in buliding dock/berth/land construction etc. (1 ship, 1.5 ships: Semi-tandem, dual
entrance
- Block loading process (single starting block, multi starting blocks, inserting block : No, Yes)
(4) Final dock (No, Yes: In-house, Other place of the same company, use other company)
(5) Other feature of contruction procedure

5. Quality Control System : (Refer to Quality manual, if available)

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Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

Item and description Result Remark

(1) Existence of the organization chart including the departments
of design, purchasing, maunufactiring and quality assurance
- Are the function, responsibility and competence of the
organization clear?
(2) Quality control organization
- Existence of quality control organization
person including the
- Number of employees in this organization
chief
- Existence of procedures or plans related to test and
inspections
(3) Pre-inspection system of shipyard
- Is pre-inspection carried out prior to Class
inspection?
- Are pre-inspection assigned? (Check the list) persons
- Number of pre-inspectors (releted to hull only)
- Are inspection result markedmark on the object and /or
recorded in the checklist
(4) Records of inspection and tests
- Are records made and kept properly?
- Does the responsible person verify the records?
- Can the adoption of necessary corrective actions against
non conformity happened be checked?
(5) Condition at the time of the surveys in the presence of class
surveyors
- Is the schedule of the surveys changed often?
- Are pre inspection, shipyard inspection and repairs
completed beforehand?
- Are the sufficient preparations for surveys such as
scaffoldings, lighting, cleaning made ?
Note: Above mentioned (3) and (4) include the acceptance inspection of subcontracted items.

6. Measure for Safety and Health

Item and description Result Remarks

(1) Are conditions of scaffolding, nets, safety belt, lighting and
ventilation good?
(2) Does sufficient attention paid for radiographic examination
and operation of cherry picker?
Note :

7. Control System of Non-Destructive Examination (NDE)

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Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

Item and description Result Remarks

(1) Number of NDE supervisors in shipyard (including persons
responsible for judging result)
persons
(2) Dependence on subcontracted NDE work
- Number of shipyard employees persons
- Number of sub contractors persons
(3) NDE sub contractor company’s name and official technical
Name
qualifications
(approved by)
Name
(approved by)
(4) Grade and number of NDE employees with official technical
qualifications in shipyard
- Specialized in radiography Grade persons
- Specialized in ultrasonic Grade persons
- Specialized in surface detection Grade persons

(5) If non destructive examinations are subcontracted, the

grade and number of officially qualified persons
- Specialized in radiography Grade persons
- Specialized in ultrasonic Grade persons
- Specialized in surface detection Grade persons

(6) Non destructive examination equipment (in house)

- Number of radiographic equipment
- Number of ultrasonic equipment
Note : Even if all works are subcontracted, it is recommendable to attach the qualified person(s) who can verify the works.

8. Quality Control on Production Line

Item and description Result Remarks

8.1 Preventative measures for misuse of materials
Title of supervisor:
(1) Job title of supervisor and person in charge of collating ordered
steel and received steel, and checking of mill sheet Title of person in charge:

(2) Are means for checking the material grade in hand

prescribed for high grade steels
(3) Are regulations prescribed for checking the material grade
for high tensile steel for low temperature applications?

Are there regulations for inscribing high tensile steel on the

surface of the high tensile steel and special indication for steel
for low temperatre applications?
(4) Are procedures for re using of remaining cut off mild steel?
(5) Are there procedures for re using of remaining cut off high-
tensile steel?
(6) In the case of (4) and (5) above, can a collation be made with the
mill sheet?
(7) Section of controlling the lists of remaining cut off steel Name of section:

Note:
- In case of high tensile steel, are means identifying different grades
- In the case of (3) and (4) above, are the materials approved by other classes controlled similarly?

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Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.2

Item and description Result Remarks

8.2 Shot blasting/Primer coating
(1) Existence of surface preparation standards
(2) Existence of coating thickness control standards
- Existence of thickness measurement records
Note:
The standard is to include the description related traceability after shot blasting and primer coating.
8.3 Marking and cutting (Assembly work)
(1) Existence of standards for accuracy and periodical
inspection of tape measures, tapes, stencils, etc.
(2) Existence of standards for accuracy of cut dimensions and edge
preparation
(3) Existence of standards for finish of cutting face
(4) What is the frequency and extent of maintenance and
inspection carried out for ensuring accuracy of NC cutter and/or
flame planer?
(5) In case of NC, are the disks, tapes etc. maintained in good
condition?
(6) What are the measures adopted and guidance given to make
the worker fully conversant with cutting work standards for
maintaining accuracy?
Note:
- In case of (2) and (3) above, check items are to include confirmation of edge preparations free from piercing hole.
- NC for section bars is also to be in accordance with the above.
8.4 Bending and strain free
(1) Existence of standards for maximum heating temperatures
during water cooling and at the time of bending and distortion
removal of steel by quick heating and cooling
(2) Existence of regulations for plate thickness and bending radius
for flange processing
(3) What are the measures adopted and guidance given to make
the worker fully conversant with maintaining quality and accuracy
during the bending process?
Note:
8.5 Control of Welding Procedure
(1) Are all welding procedures applied to the ships approved by BKI or
other IACS members?
Note:
8.6 Treatment of serious non-conformities
(1) Are repair plans submitted to BKI when serious non
conformities happened?
(2) Were the NDE (RT/UT) plans submitted at appropriate timing?
(3) Was the extent of tests extended considering the results of the
test?
Note:
8.7 Hydrostatic and Watertight Test
(1) Is the test plan submitted to BKI?
(2) Are vacuum tests applied to?
(3) Are local air injection tests during sub assembly works applied
to?
Note :

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.3

A.3 The Wastage Allowance

1. Where thickness measurements according to result in corrosion and wear values exceeding those
stated in the following, the respective hull structural elements will have to be renewed. Where reduced
material thickness was admitted for the new building (effective system of corrosion prevention), the
permissible corrosion allowances are to be based on the unreduced rule thickness.
2. Longitudinal strength
Maximum permissible reduction of midship section modulus: 10% is to be taken from requirement given
in Rules for Hull (Pt.1, Vol.II) Sec.5.C.1 and Sec.5.C.2, whichever is the greater.
3. Local strength
Maximum permissible large surface reduction of plate thickness and web thickness of profiles: tk
for t ≤ 11,5 mm: tk = 1,5 mm
for t > 11,5 mm: tk = 0,09·t + 0,45 mm, max. 3,0 mm
t = plate and/or web thickness in [mm], as stipulated in the Construction Rules.
Maximum permissible locally limited reduction of thickness: 0,2t.
In ballast tanks in way of 1,5 m below the weather deck, if the weather deck is the tank deck:
tk = 2,5 mm
In cargo oil tanks in way of 1,5 m below the weather deck, if the weather deck is the tank deck and for
horizontal structural elements in cargo oil and fuel tanks: tk = 2,0 mm.
In dry cells, such as fore to aft passageways of container ships and comparable spaces, and for hatch covers
of dry cargo hold:
for t ≤ 11,5 mm: tk = 1,0 mm
for t > 11,5 mm: tk = 0,09·t, max. 2.5 mm
Maximum permissible surface reduction of the side shell in way of the ice belt: 2,0 mm.
4. Anchor equipment
For anchors, reduction of weight shall not exceed 10%. For chain cables, reduction of the mean diameter
shall not exceed 12%.
5. Hatch covers and hatch coaming
5.1.1 Corrosion additions for hatch cover and hatch coaming are in accordance with Rules for Hull (Pt.1,
Vol. II), Table 17.1.
5.1.2 Steel renewal is required where the gauged thickness is less than tnet + 0,5 mm for:

— single skin hatch covers,

— the plating of double skin hatch covers, and

— coaming structures the corrosion additions tK of which are provided in Rules for Hull (Pt.1, Vol. II),
Table 17.1.

5.1.3 Where the gauged thickness is within the range tnet + 0,5 mm and tnet + 1,0 mm, coating (applied
in accordance with the coating manufacturer’s requirements) or annual gauging may be adopted as an
alternative to steel renewal. Coating is to be maintained in GOOD condition, as defined in Annex A.7.
5.1.4 For the internal structure of double skin hatch covers, thickness gauging is required when hatch
cover top or bottom plating renewal is to be carried out or when this is deemed necessary, at the discretion
of Surveyor, on the basis of the plating corrosion or deformation condition. In these cases, steel renewal
for the internal structures is required where the gauged thickness is less than tnet .

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Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.3

5.1.5 For corrosion addition tK = 1,0 mm the thickness for steel renewal is tnet and the thickness for coating
or annual gauging is when gauged thickness is between tnet and tnet + 0,5 mm.
5.1.6 For coaming structures, the corrosion additions tK of which are not provided in Rules for Hull
(Pt.1, Vol. II), Table 17.1, steel renewal and coating or annual gauging are to be in accordance with BKI
requirements.
6. Transverse corrugated watertight bulkheads built in accordance Rules for Hull (Pt.1, Vol.II), Section
23, E and J (IACS UR S18 and S19)
6.1 For bulk carriers of 150 m in length and upwards, contracted for construction on or after 1 July 1998
and carrying solid bulk cargoes having a density of 1.0 t/m3 and above, Steel renewal is required where the
gauged thickness is less than tnet + 0.5 mm. Where the gauged thickness is within the range tnet + 0.5 mm
and tnet + 1.0 mm, coating (applied in accordance with the coating manufacturer’s requirements) or annual
gauging may be adopted as an alternative to steel renewal.
The corrosion addition tk is to be taken equal to 3.5 mm.
6.2 For the following bulk carriers of 150 m in length and upwards and carrying solid bulk cargoes having a
density of 1.78 t/m3 and above, steel renewal for the gauged thickness of transverse watertight corrugated
bulkheads between cargo holds Nos.1 and 2, according to Annex B.6.5:

1) Bulk carriers contracted for construction before 1 July 1998 and not complying with Rules for Hull
(Pt.1, Vol.II) Sec.23.E;

2) Bulk carriers the keels of which were laid or which were at a similar stage of construction before 1
July 1999 and not complying with Rules for Hull (Pt.1, Vol.II) Sec.23.E.

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.4

A.4 Class Requirements of Laid-Up Ships

A. General
1. Vessels which are laid up before surveys due to be overdue, shall submit Lay-up Application attached
with “Lay-up Maintenance Program” to BKI for inspection and approval. The lay-up maintenance program
includes:
1.1 The safety conditions to be kept throughout the lay-up period
1.2 The measures taken to preserve the maintenance of the ship throughout the lay-up period
1.3 The survey requirements to be complied with for lay-up, maintenance of class in lay-up and
re-commissioning.

B. Safety conditions
1. Power supply

Adequate power supply is to be supplied, or readily available, all around the clock (24 hours), either from
independent means on board the ship or from shore.

2. Manning

Watch personnel are to be provided. The number of the watch personnel will depend on the size of the
ship, the lay-up site and mooring arrangements, the shore assistance available in case of fire, leakage or
flooding. A permanent shore communication installation (radio, telephone) is also to be available.

3. Fire protection and fire fighting

Fire protection and fire-fighting either fixed or portable shall be working order and in operation, and
automatic fire alarm systems, where provided, are to be in working order and in operation.

4. Protection against explosion

Cargo spaces and piping systems are to be cleaned and ventilated to prevent gas from forming any pockets.
An inert gas system in operation is recommended for the cargo spaces of oil and chemical tankers.
All flammable materials, sludge, etc. are to be removed from the ship’s bilge, tank tops, double bottom
tanks, engine room, pump rooms and similar spaces.Hot work is not being carried out during lay-up, unless
special precautionary measures are taken.

5. Safety equipment

All the equipment usually recommended for the safety of the watch personnel is to be provided, kept in
working order and tested regularly.
The usual life-saving equipment such as liferafts, life-buoys, breathing apparatus, oxygen masks and distress
signals is to be provided and made accessible.
The requirements of the flag Administration and of the local port authorities of the lay-up site are usually
to be applied.

6. Emergency power

The emergency source of power, emergency generator and/or emergency air compressor are to be kept in
working order and tested weekly.

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Vol I Rules for Classification and Surveys
Annex A Annexes to Section 1-3 A.4

C. Preservation measures for lay-up and maintenance

1. A lay-up log-book is to be kept on board, in which the maintenance work and tests carried out during the
layup period are to be entered with the corresponding dates. The nature and frequency of the maintenance,
inspections and tests are also to be defined in the lay-up log book.
The following measures for preservation and maintenance during the lay-up period are to be taken by
Owners according to the type of ship, hull equipment, machinery installations and the specific cases of
lay-up conditions.
2. Exposed parts of the hull
2.1 Underwater parts of the hull are to be protected against corrosion. It is advisable to provide
an impressed current cathodic protection system where the quantity of corrosive waste discharge is
particularly high. When such systems are provided, they are to be serviced and checked at regular intervals.
The condition of sacrificial anodes is to be evaluated at the annual lay-up condition surveys.
2.2 The coating of the hull above the waterline, exposed decks, access doors or covers on exposed decks,
and hatch covers is to be maintained in satisfactory condition.
All accesses leading to internal spaces are to be kept closed.
All vent pipes and ventilation trunks are to be kept closed.
3. Internal spaces
3.1 Cargo tanks and cargo holds are to be emptied, cleaned and kept dry.
Ballast tanks are to be kept either full or empty. When ballast spaces are kept filled with sea water, special
care is to be taken to keep such spaces topped up and protected against corrosion. When provided,
sacrificial anodes are to be renewed when deemed necessary. The topping up is to be regularly verified.
3.2 Chain lockers are to be drained, cleaned and kept dry. Coating with bituminous paint is recommended.
3.3 Fuel oil and lubricating oil tanks are to be drained regularly.
Lubricating oil analysis is to be performed regularly and the oil renewed when the result is not satisfactory.
Prior to being refilled, tanks are to be cleaned.
Empty lubricating oil tanks are to be cleaned and kept dry.
Fresh water or distilled water tanks are to be kept full or empty. Empty tanks are to be cleaned and kept
dry. Where cement wash is used as a coating, this is to be examined and, if necessary, repaired prior to
filling.
3.3.1 The bilge and tank top in engine rooms are to be cleaned and kept dry.
Hull sea inlet and outlet valves not in use are to be kept closed.
3.4 Deck fittings
3.4.1 The windlass, capstans and winches are to be regularly greased and turned once a week.
All wire cables are to be kept greased.
Visible parts of chains are to be coal-tarred and examined regularly.
Chocks and hawse pipes are to be coated with bituminous paint or equivalent if deemed necessary.
Cargo piping on deck is to be drained, blown through if deemed necessary and kept dry by opening up
drains.
Electrical machinery and navigational equipment are to be protected by watertight covers.
3.5 Machinery

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Annex A Annexes to Section 1-3 A.4

3.5.1 Machinery - General

Exposed mechanical parts of machinery are to be greased.
All rotating machinery such as diesel engines, reciprocating engines, pumps, turbines, electric motors and
generators are to be turned at regular intervals with a limited number of revolutions (the lubricating oil
system should be put in operation or proper priming applied). Units are not to be stopped in the same
position as the previous one.
3.5.2 Reduction gears
For large reduction gears, a fan activating the circulation of hot air in closed circuit with air hoses is to be
fitted (intake at lower part of casing and discharge at upper part).
3.5.3 Auxiliary turbine-driven machinery
Stators are to be drained and kept dry.
Shaft sealing glands are to be lubricated.
Lubricating oil is to be analysed and renewed when deemed necessary. Prior to oil renewal, the oil casings
are to be cleaned.
Exhaust steam pipes are to be kept dry.
Stuffing boxes are to be dismantled.
Turbines are to be turned weekly an integer number of revolutions plus one quarter of a revolution.
3.5.4 Condensers and heat exchangers
Condensers and heat exchangers are to be drained and kept dry.
Desiccant is to be placed in steam spaces.
Water sides are to be washed with fresh water.
The condition of the zinc anodes is to be periodically checked.
When tubes are fitted with plastic or fibre packing, water sides are to be filled with alkaline distilled water.
When tubes are expanded or fitted with metal packing, water sides are to be provided with desiccants and
kept dry.
3.5.5 Auxiliary machinery
Air receivers are to be drained, opened up and cleaned.
Pressure relief valves are to be cleaned and slightly lubricated.
Air compressor crankcases are to be drained, cleaned and refilled with clean oil. Cylinders and valves are
to be lubricated. Coolers are to be drained and dried. Air drains are to be opened and the system dried.
Air start lines are to be drained and dried.
De-aerators are to be drained and dried.
Feed pumps and extraction pumps are to be drained and dried.
Air ejectors are to be drained and dried.
Main circulation pumps are to be drained and dried.
Evaporators are to be drained, cleaned and dried.
3.5.6 Piping
Pipes not in use are to be drained and kept dry.

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Annex A Annexes to Section 1-3 A.4

3.5.7 Diesel engines

Daily tank fuel oil outlet pipes and all injection equipment are to be filled with filtered gas oil.
Fresh water circuits are to be filled with water mixed with rust inhibitors. Fresh water pH is to be checked
monthly.
Oil of hydraulic regulators is to be replaced.
Sea water cooling pipes are to be drained.
Crankcases are to be provided with desiccant.
Starting valves are to be lubricated (internally and externally).
Motor oil is to be sprayed in cylinders and on all external parts liable to corrosion.
Cams and cylinders are to be motor oil sprayed monthly.
Turbo-compressor/charger ball bearings are to be oil sprayed and rotated for an integer number of
revolutions plus one quarter of a revolution.
Engine air inlets and exhaust gas pipes are to be sealed.
Scavenge spaces are to be cleaned
Engines are to be turned weekly.
3.5.8 Shaft lines
Shaft lines are to be coated with grease.
Shaft bearing cooling pipes are to be drained.
For sea water lubricated propeller shafts, the packing gland of the engine room stuffing box is to be
tightened.
For oil lubricated sterntubes, lubricating oil is to be analysed and renewed if not satisfactory. The oil level
in the tank is to be verified regularly.
Propeller shaft lines are to be rotated an integer number of revolutions plus one quarter of a revolution.
3.6 Electrical installations
3.6.1 Main and secondary switchboards, sub-feeder panels, fuse panels and starters are to be made tight.
Desiccant is to be provided.
Contacts of relays, breakers and switch-breakers are to be coated with neutral vaseline.
Bearings of generators are to be cleaned of old grease and protected with new oil or grease.
Carbon brushes are to be lifted off their commutations.
3.6.2 Electrical insulation of each item is to be kept at a minimum 200000 Ω and general insulation is
to be not less than 50000 Ω. Local electric heating may be necessary to improve the level of insulation,
particularly in the generators/ alternators and large motors.
A megger test is to be performed regularly.
3.7 Steering gear
3.7.1 Exposed mechanical parts are to be greased or oil sprayed. For electrical parts the same preservation
measures given in 3.6 are to be taken.
It is recommended that the steering gear should be operated monthly.
3.8 Boilers
3.8.1 Smoke sides of boilers are to be swept, washed clean with basic hot water and hot air dried.

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3.8.2 Water and steam sides should preferably be preserved using the dry method, keeping the moisture
at the lowest possible level, the ideal level being between 30% and 35%. It is advisable to ensure that no
residual water remains to cause rapid corrosion. Drum doors are to be kept closed.
In other cases, it is advisable to keep the boilers, superheaters and economisers filled with water having a
pH around 10,5. Hydrazine hydrate treatment of the water is preferable to reduce risks of corrosion caused
by dissolved oxygen.
The water is to be regularly analysed.
3.8.3 Air heaters are to be cleaned and kept dry.
Uptake, shell and fan outlets are to be cleaned and kept closed with watertight hoods.
Burners are to be dismantled, and atomisers greased.
Desiccant is to be provided in furnaces where deemed necessary.
Expansion arrangements (sliding feet) are to be suitably greased.
The internal condition of boilers is to be checked every three months.
3.8.4 Boilers may also be preserved sealed with inert gas (nitrogen), provided that cocks and valves are
tight and the installation allows an internal pressure of at least 0,05 bar to be maintained to prevent air
penetration. Regular checks of the overpressure are to be carried out and results recorded in the log-book.
3.9 Automation equipment
3.9.1 Recommendations for electronic components are the same as those given for electrical installations.
For pneumatic parts the manufacturers’ recommendations are to be followed and the system is to be
checked regularly.
Pressure, temperature or level sensors are generally not affected by damage when not used. However,
when available, the manufacturers’ recommendations are to be followed.
4. Lay-up site and mooring arrangements
4.1 The choice and suitability of the lay-up site, as well as the type of mooring conditions, the mooring
arrangements and their efficiency during the lay-up period remain the responsibility of the Owner. However,
at the Owner’s request, the mooring arrangement may be reviewed by BKI.
4.2 Recommendations for the lay-up site
4.2.1 The following recommendations are to be considered by Owners regarding the choice and suitability
of the lay-up site.
The site should be:

— sheltered from open sea, strong currents and waves

— not exposed to whirling winds or turbulent tidal waves

— not exposed to moving ice

— clear of corrosive waste waters

— provided with adequate ship/shore communications.

4.3 Recommendations for the mooring arrangements

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4.3.1 The following recommendations are to be considered by Owners with respect to the mooring
arrangements:
— ground holding should be adequate
— vessels laid-up to buoys or anchored should be moored in such a way as to be prevented from
swinging with normal wind and tidal changes
— chain cables should not be subject to cross-contact or twisting and stern anchorage should generally
be provided.
— laid-up ships should be in ballast condition in order to reduce the effects of wind. Due consideration
should be given to the still water bending moment. For guidance, normal ballast draft should be
roughly between 30% and 50% of the maximum draft.
4.3.2 Ships should normally be moored singly. However, when several ships are moored together, the
following provisions are to be made:
— ships are to be moored bow to stern
— ships are to be of approximately the same size
— the number of ships moored together is, in principle, not to exceed six
— breast-lines are to be of similar elasticity
— fenders are to be provided.
4.4 Review of the mooring arrangements
4.4.1 At the Owners’ request, the mooring arrangements may be reviewed by BKI.
4.4.2 The proposal for the mooring arrangements is in such case to be submitted by the Owner and is to
include the following information.
.1 Mooring site:
— geographical area (to be specified on a map)
— characteristics of the sea bottom
— water depth
— preferential angular sectors (effects of wind/tide/current) indicated according to statistical studies
— wave characteristics (amplitude, periods)
.2 Geometry of mooring arrangements:
— ship’s position and direction
— shore anchorage
— diagram showing mooring equipment (fore and aft)
— angle between chain cables and ship’s centreline
.3 Characteristics of mooring equipment:
— maximum holding strength of each anchor
— type of mooring lines (chains, cables, sinkers, etc.)
— length of each section
— weight of each section
— mechanical characteristics of each section (breaking load)
— weight of sinkers.

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4.4.3 On completion of the installation, the mooring arrangements are to be inspected by BKI. When the
ship is anchored, the underwater installation is to be inspected by a diver whose report is to be presented
to BKI.
4.4.4 It is the responsibility of the Owners to ascertain the efficiency of the mooring arrangements during
the lay-up period. The mooring arrangements are to be re-examined at regular intervals (at least each year
when the ship is anchored) and when abnormal weather conditions occur at the lay-up site.

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A.5 Survey of Watertight Cable Transits

A. General
1. Application
1.1 These requirements apply to all ships contracted for construction on or after 1st July 2021 and are in
addition to the requirements of Section 3, B.1.1 and B.1.3 and Annex A.2.
1.2 Watertight cable transits are to be installed and maintained in accordance with the manufacturer’s
requirements and in accordance with the requirements of the relevant Type Approval certification.
1.3 Watertight cable transit seal systems should be inspected in accordance with Table A.2.1 item 8.6.

B. Cable Transit Seal Systems Register

1. New Construction
1.1 A Cable Transit Seal Systems Register (Register) is to be provided by the shipbuilder for all watertight
cable transits fitted to the ship. For an example of a register see Table A.5.1. The Register can be in either a
hard copy or digitized media. It is to include a marking / identification system, documentation referencing
manufacturer manual(s) for each type of cable transit installed, the Type Approval certification for each type
of transit system, applicable installation drawings, and a recording of each installed transit documenting the
as built condition after final inspection in the shipyard. It is to include sections to record any inspection,
modification, repair and maintenance.
1.2 The Register shall be reviewed by the attending Surveyor to confirm it contains a list of the watertight
cable transits, applicable cable transit information and sections to maintain in-service maintenance and
survey records.
1.3 For manned ships the Register is to be held onboard of the ship. For unmanned ships, if a suitable
storage location does not exist onboard, the Register may be held ashore. The Register is to be readily
available for the attending surveyor.

Table A.5.1 Recommendatory Sample-Cable Transit Seal System Register

Name of Ship : Sample
IMO No. : 12345
Place : Hamburg
Date : XX/XX/2017

Inspected by : Smith
Transits 4
Total Openings 4
NOTES :
Inspected side

C = Compound (not known brand)

FRAME

R = Smith Blocks
CONDITION (G.F.P)

TRANSIT
Type Approved

B = MCT Williams
MAINTAINED

CHECKED BY
INSPECTED

MODIFIED
REPAIRED

H = Heavy corrosion
BRAND

N = Nelson, Terasaki DATE

MB = Mixed brands
MM = Mixed module sizes
Drawing number ID Location F B Type Opening number NVD = No Visible Defects
CPA = Checkpoints rectangular frames
CPB = Checkpoints round frames

GIA-07-1047-000-883 TT-MCT-011 C d=50 X NVD PTO 26/02/2015

GIA-07-1047-000-883 TT-MCT-012 C 450x200 X NVD PTO 26/02/2015
GIA-07-1047-000-883 TT-MCT-013 C 550x200 X NVD PTO 26/02/2015
GIA-07-1047-000-883 TT-MCT-014 C 750x200 X Open, drilled hole not closed PTO 26/02/2015

2. Ships in Service
2.1 The owner is to maintain the Register to record any disruption (repair, modification or opening out
and closing) to a cable transit or to record the installation of a new cable transit.

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C. Installation and Maintenance of Watertight Cable Transits

1. At new construction and periodic surveys it is to be confirmed that:

— Cable transits have been installed, and where disrupted have been reinstated, in accordance with the
manufacturer’s requirements and in accordance with the requirements of Type Approval.

— Where specified, appropriate specialized tools have been used.

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A.6 Testing Procedures of Watertight Compartments

A. General
1. Testing to confirm the watertightness of tanks and watertight boundaries and the structural adequacy
of tanks which form the watertight subdivisions5) of ships is to be completed. Verification of the
weathertightness of structures and shipboard outfitting is to be carried out. The tightness of all tanks
and tight boundaries of new ships and those tanks and boundaries whose structural integrity is affected
by major conversions or major repairs6) is to be confirmed prior to the delivery of the ship or prior to the
completion of the modification or repair as relevant.
2. Testing procedures of watertight compartments for ships built in compliance with SOLAS 1974 as
amended (including ships which are to comply with the requirements Rules for Bulk Carrier and Oil Tanker
(Pt.1, Vol.XVII) ) are to be carried out in accordance with B., unless:
1) The shipyard provides documentary evidence of the Owner’s agreement to a request to the Flag
Administration for an exemption from the application of Chapter II-1, Regulation 11 of SOLAS 1974
as amended, or for an equivalency agreeing that the content of C. is equivalent to Chapter II-1,
Regulation 11 of SOLAS 1974 as amended; and

2) The above-mentioned exemption/equivalency has been granted by the responsible Flag

Administration.
3. Testing procedures of watertight compartments are to be carried out in accordance with C. for ships not
built in compliance with SOLAS 1974 as amended (SOLAS ships (including ships which are to comply with
the requirements Rules for Bulk Carrier and Oil Tanker (Pt.1, Vol.XVII) )) and those ships built in compliance
with SOLAS 1974 as amended (SOLAS ships) for which:
1) The shipyard provides documentary evidence of the Owner’s agreement to a request to the Flag
Administration for an exemption from the application of Chapter II-1, Regulation 11 of SOLAS 1974
as amended, or for an equivalency agreeing that the content of C. is equivalent to Chapter II-1,
Regulation 11 of SOLAS 1974 as amended; and

2) The above-mentioned exemption/equivalency has been granted by the responsible Flag

Administration.
4. Testing procedures of watertight compartments are to be carried out in accordance with D for
non-SOLAS ships, see SOLAS Chapter I, Regulation 1 and Regulation 3.

B. SOLAS Ships (Ships Built in Compliance with SOLAS 1974 as Amended)

1. Application

1.1 All gravity tanks7) and other boundaries required to be watertight or weathertight are to be tested in
accordance with this Procedure and proven to be tight and structurally adequate as follows:
— Gravity Tanks for their tightness and structural adequacy,

— Watertight Boundaries Other Than Tank Boundaries for their watertightness, and

— Weathertight Boundaries for their weathertightness

1.2 The testing of cargo containment systems of liquefied gas carriers is to be in accordance with the
testing requirements in Rules for Ships Carrying Liquefied Gases in Bulk (Pt.1, Vol.IX), Sec. 4, E.4.21 to
E.4.26 will apply.
5)
Watertight subdivision means the transverse and longitudinal subdivisions of the ship required to satisfy the subdivision
requirements of SOLAS Chapter II-1.
6)
Major repair means a repair affecting structural integrity.
7)
Gravity tank means a tank that is subject to vapour pressure not greater than 70 kPa.

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1.3 The testing of structures not listed in Table A.6.1 or Table A.6.2 is to be specially considered.

2. Test Types and Definitions

2.1 The following two types of tests are specified in this requirement:
2.1.1 Structural Test

A test to verify the structural adequacy of tank construction. This may be a hydrostatic test or, where the
situation warrants, a hydropneumatic test.

2.1.2 Leak Test

A test to verify the tightness of a boundary. Unless a specific test is indicated, this may be a
hydrostatic/hydropneumatic test or an air test. A hose test may be considered an acceptable form of leak
test for certain boundaries, as indicated by footnote 3 of Table A.6.1

2.2 The definition of each test type is as follows:

Hydrostatic test:
A test wherein a space is filled with a liquid to a specified head.
(Leak and Structural)
Hydropneumatic test: A test combining a hydrostatic test and an air test, wherein a space is
(Leak and Structural) partially filled with a liquid and pressurized with air.
Hose Test: A test to verify the tightness of a joint by a jet of water with the joint
(Leak) visible from the opposite side.
A test to verify tightness by means of air pressure differential and leak
Air Test:
indicating solution. It includes tank air test and joint air tests, such as
(Leak)
compressed air fillet weld tests and vacuum box tests.
Compressed Air Fillet Weld Test: An air test of fillet welded tee joints wherein leak indicating solution is
(Leak) applied on fillet welds.
Vacuum Box Test: A box over a joint with leak indicating solution applied on the welds. A
(Leak) vacuum is created inside the box to detect any leaks.
Ultrasonic Test: A test to verify the tightness of the sealing of closing devices such as hatch
(Leak) covers by means of ultrasonic detection techniques.
A test to verify that no visual dye penetrant indications of potential
Penetration Test:
continuous leakages exist in the boundaries of a compartment by means
(Leak)
of low surface tension liquids (i.e. dye penetrant test).

2.3 The “top of the overflow” is defined as being the top of any overflow system which is used to prevent
overfilling of a tank. Such system can be an overflow pipe, airpipe, intermediate tank. For gravity tanks
(i.e. sewage, grey water and similar tanks, not filled with pumps) the top of the overflow is to be taken as
the highest point of the filling line.

Note:

Gauging devices are not considered equivalent to an overflow system with the exception of fuel oil
overflow tanks not intended to hold fuel which have been fitted with a level alarm.

Where a tank is fitted with multiple means of preventing overfilling, the decision on which overflow system
is to be used to determine the test head is to be based on the highest point to which the liquid may rise in
service.

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3. Test Procedures
3.1 General

Tests are to be carried out in the presence of a Surveyor at a stage sufficiently close to the completion of
work with all hatches, doors, windows, etc. installed and all penetrations including pipe connections fitted,
and before any ceiling and cement work is applied over the joints. Specific test requirements are given in
3.4 and Table A.6.1. For the timing of the application of coating and the provision of safe access to joints,
see 3.5, 3.6 and Table A.6.3.

3.2 Structural test procedures

3.2.1 Type and time of test

Where a structural test is specified in Table A.6.1 or Table A.6.2, a hydrostatic test in accordance with 3.4.1
will be acceptable. Where practical limitations (strength of building berth, light density of liquid, etc.)
prevent the performance of a hydrostatic test, a hydropneumatic test in accordance with 3.4.2 may be
accepted instead.
A hydrostatic test or hydropneumatic test for the confirmation of structural adequacy may be carried out
while the ship is afloat, provided the results of a leak test are confirmed to be satisfactory before the ship is
afloat. Alternative equivalent tank testing procedures may be considered for tanks which are constructed
from composite materials such as glass reinforced plastic (GRP) and fibre reinforced plastic (FRP) based on
the recommendations of the composite manufacturer.

3.2.2 Testing Schedule for New Construction or Major Structural Conversion

1) Tanks which are intended to hold liquids, and which form part of the watertight subdivision of the
ship, shall be tested for tightness and structural strength as indicated in Table A.6.1 and Table A.6.2.
2) The tank boundaries are to be tested from at least one side. The tanks for structural test are to
be selected so that all representative structural members are tested for the expected tension and
compression.
3) The watertight boundaries of spaces other than tanks for structural testing may be exempted,
provided that the water-tightness of boundaries of exempted spaces is verified by leak tests and
inspections. Structural testing may not be exempted and the requirements for structural testing of
tanks in 1) to 2) shall apply, for ballast holds, chain lockers and a representative cargo hold if intended
for in-port ballasting.
4) Tanks which do not form part of the watertight subdivision of the ship1, may be exempted from
structural testing provided that the water-tightness of boundaries of exempted spaces is verified by
leak tests and inspections.

3.3 Leak test procedures

For the leak tests specified in Table A.6.1, tank air tests, compressed air fillet weld tests, vacuum box
tests in accordance with 3.4.4 through 3.4.6, or their combination, will be acceptable. Hydrostatic or
hydropneumatic tests may also be accepted as leak tests provided that 3.5, 3.6 and 3.7 are complied with.
Hose tests will also be acceptable for such locations as specified in Table A.6.1, Footnote 3, in accordance
with 3.4.3.
The application of the leak test for each type of welded joint is specified in Table A.6.3.
Air tests of joints may be carried out in the block stage provided that all work on the block that may affect
the tightness of a joint is completed before the test. See also 3.5.1 for the application of final coatings and
3.6 for the safe access to joints and the summary in Table A.6.3.

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3.4 Test Methods

3.4.1 Hydrostatic test

Unless another liquid is approved, hydrostatic tests are to consist of filling the space with fresh water or
sea water, whichever is appropriate for testing, to the level specified in Table A.6.1 or Table A.6.2. See also
3.7.
In cases where a tank is designed for cargo densities greater than sea water and testing is with fresh water
or sea water, the testing pressure height is to simulate the actual loading for those greater cargo densities
as far as practicable but the test pressure shall not exceed the maximum design internal pressure at the top
of tank.
All external surfaces of the tested space are to be examined for structural distortion, bulging and buckling,
other related damage and leaks.

3.4.2 Hydropneumatic test

Hydropneumatic tests, where approved, are to be such that the test condition, in conjunction with the
approved liquid level and supplemental air pressure, will simulate the actual loading as far as practicable.
The requirements and recommendations for tank air tests in 3.4.4 will also apply to hydropneumatic tests.
See also 3.7.
All external surfaces of the tested space are to be examined for structural distortion, bulging and buckling,
other related damage and leaks.

3.4.3 Hose test

Hose tests are to be carried out with the pressure in the hose nozzle maintained at least at 2 x 105 Pa during
the test. The nozzle is to have a minimum inside diameter of 12 mm and be at a perpendicular distance
from the joint not exceeding 1,5 m. The water jet is to impinge directly upon the weld. Where a hose test is
not practical because of possible damage to machinery, electrical equipment insulation or outfitting items,
it may be replaced by a careful visual examination of welded connections, supported where necessary by
means such as a dye penetrant test or ultrasonic leak test or the equivalent.

3.4.4 Tank air test

All boundary welds, erection joints and penetrations, including pipe connections, are to be examined
in accordance with approved procedure and under a stabilized pressure differential above atmospheric
pressure not less than 0,15 x 105 Pa, with a leak indicating solution such as soapy water/detergent or a
proprietary brand applied.
A U-tube with a height sufficient to hold a head of water corresponding to the required test pressure is
to be arranged. The cross sectional area of the U-tube is not to be less than that of the pipe supplying
air to the tank. Arrangements involving the use of two calibrated pressure gauges to verify the required
test pressure may be accepted taking into account the provisions in F5.1 and F7.4 of Guidance for Marine
Industry (Pt.1, Vol.AC) Sec.7 R-140, “Recommendation for Safe Precautions during Survey and Testing of
Pressurized Systems”.
A double inspection is to be made of tested welds. The first is to be immediately upon applying the leak
indication solution; the second is to be after approximately four or five minutes in order to detect those
smaller leaks which may take time to appear.

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3.4.5 Compressed air fillet weld test

In this air test, compressed air is injected from one end of a fillet welded joint and the pressure verified at
the other end of the joint by a pressure gauge. Pressure gauges are to be arranged so that an air pressure
of at least 0,15 x 105 Pa can be verified at each end of all passages within the portion being tested.
Note:
Where a leak test is required for fabrication involving partial penetration welds, a compressed air test is
also to be applied in the same manner as to fillet weld where the root face is large, i.e., 6-8 mm.

3.4.6 Vacuum box test

A box (vacuum testing box) with air connections, gauges and an inspection window is placed over the joint
with a leak indicating solution applied to the weld cap vicinity. The air within the box is removed by an
ejector to create a vacuum of 0,20 x 105 – 0,26 x 105 Pa inside the box.

3.4.7 Ultrasonic test

An ultrasonic echo transmitter is to be arranged inside of a compartment and a receiver is to be arranged on

the outside. The watertight/weathertight boundaries of the compartment are scanned with the receiver in
order to detect an ultrasonic leak indication. A location where sound is detectable by the receiver indicates
a leakage in the sealing of the compartment.

3.4.8 Penetration test

A test of butt welds or other weld joints uses the application of a low surface tension liquid at one side of
a compartment boundary or structural arrangement. If no liquid is detected on the opposite sides of the
boundaries after the expiration of a defined period of time, this indicates tightness of the boundaries. In
certain cases, a developer solution may be painted or sprayed on the other side of the weld to aid leak
detection.

3.4.9 Other test

Other methods of testing, except as provided in C., may be considered by BKI upon submission of full
particulars prior to the commencement of testing.

3.5 Application of coating

3.5.1 Final coating

For butt joints welded by an automatic process, the final coating may be applied any time before the
completion of a leak test of spaces bounded by the joints, provided that the welds have been carefully
inspected visually to the satisfaction of the Surveyor.
Surveyors reserve the right to require a leak test prior to the application of final coating over automatic
erection butt welds. For all other joints, the final coating is to be applied after the completion of the leak
test of the joint. See also Table A.6.3.

3.5.2 Temporary coating

Any temporary coating which may conceal defects or leaks is to be applied at the time as specified for the
final coating (see 3.5.1). This requirement does not apply to shop primer.

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3.6 Safe access to joints

For leak tests, safe access to all joints under examination is to be provided. See also Table A.6.3.

3.7 Hydrostatic or hydropneumatic tightness test

In cases where the hydrostatic or hydropneumatic tests are applied instead of a specific leak test, examined
boundaries must be dew-free, otherwise small leaks are not visible.

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Table A.6.1 Test Requirements for Tanks and Boundaries

Tank or boundary
No. Test type Test head or pressure Remarks
to be tested
The greater of
Leak and - top of the overflow10 ,
1 Double bottom tanks4
structural1 - to 2,4 m above top of
tank2 , or
- to bulkhead deck
including pump room double
See 3.4.4 through 3.4.6, as bottom and bunker tank
2 Double bottom voids5 Leak
applicable protection double hull
required by MARPOL Annex I
The greater of
Leak and - top of the overflow10 ,
3 Double side tanks
structural1 - to 2,4 m above top of
tank2 , or
- to bulkhead deck
See 3.4.4 through 3.4.6, as
4 Double side voids Leak
applicable
Deep tanks other than The greater of
Leak and
5 those listed elsewhere - top of the overflow10 ,
structural1
in this table - to 2,4 m above top of
tank2
The greater of
Leak and - top of the overflow10 ,
6 Cargo oil tanks
structural1 - to 2,4 m above top of
tank2 , or
- to top of tank2 plus
the design vapour pressure
Ballast hold of bulk Leak and
7 Top of cargo hatch coaming
carriers structural1
The greater of
Leak and
8 Peak tanks - top of the overflow10 ,
structural1
- to 2,4 m above top of
tank2
.1 Fore peak spaces See 3.4.3 through 3.4.6, as
9 Leak
with equipment applicable
See 3.4.4 through 3.4.6, as
.2 Fore peak voids Leak
applicable
3. Aft peak spaces with See 3.4.3 through 3.4.6, as
Leak
equipment applicable
See 3.4.4 through 3.4.6, as After peak to be tested after
.4 Aft peak voids Leak
applicable installation of stern tube
See 3.4.4 through 3.4.6, as
10 Cofferdams Leak
applicable
See 3.4.3 through 3.4.6, as
11 .1 Watertight bulkheads Leak8
applicable
.2 Superstructure end See 3.4.3 through 3.4.6, as
Leak
bulkheads applicable
.3 Cable penetrations in
Hose See 3.4.3
watertight bulkheads
Watertight doors
See 3.4.3 through 3.4.6, as
12 below freeboard or Leak6,7
applicable
bulkhead deck
Double plate rudder See 3.4.4 through 3.4.6, as
13 Leak
blades applicable
Shaft tunnels clear of See 3.4.3 through 3.4.6, as
14 Leak3
deep tanks applicable

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Table A.6.1: Test Requirements for Tanks and Boundaries (continued)

Tank or boundary
No. Test type Test head or pressure Remarks
to be tested
See 3.4.3 through 3.4.6, as
15 Shell doors Leak3
applicable
Weathertight hatch Hatch covers closed by
See 3.4.3 through 3.4.6, as
16 covers and closing Leak3,7 tarpaulins and battens
applicable
appliances excluded
Dual purpose
See 3.4.3 through 3.4.6, as In addition to structural test in
17 tanks/dry cargo hatch Leak3,7
applicable item 6 or 7
covers
Leak and
18 Chain lockers Top of chain pipe
structural1
L.O. sump. tanks and
other similar See 3.4.3 through 3.4.6, as
19 Leak9
tanks/spaces under applicable
main engines
The greater of:
Leak and
20 Ballast ducts - ballast pump maximum
structural1
pressure, or
- relief valve
The greater of:
- top of the overflow10 ,
Leak and
21 Fuel Oil Tanks - to 2,4 m above top of
structural1
tank2 , or
- to top of tank2 plus the design
vapour pressure, or
- to bulkhead deck
Fuel oil overflow
22 tanks not intended The greater of:
to hold fuel
Leak and
- top of the overflow10 ,
structural1
- to 2,4 m above top of
tank2 , or
- to bulkhead deck
See 3.4.3 through 3.4.6, as
23 Azimuthing Pod Leak
applicable
Notes:
1. Refer to Sub-section 3.2.2
2. The top of a tank is the deck forming the top of the tank, excluding any hatchways.
3. Hose Test may also be considered as a medium of the test. See 2.2.
4. Including tanks arranged in accordance with the provisions of SOLAS regulation II-1/9.4.
5. Including duct keels and dry compartments arranged in accordance with the provisions of SOLAS regulation
II-1/11.2 and II-1/9.4 respectively, and/or oil fuel tank protection and pump room bottom protection arranged
in accordance with the provisions of MARPOL Annex I, Chapter 3, Part A regulation 12A and Chapter 4, Part A,
regulation 22 respectively.
6. Where water tightness of a watertight door has not been confirmed by prototype test, testing by filling
watertight spaces with water is to be carried out. See SOLAS regulation II-1/16.2 and MSC.1/Circ.1572/Rev.1
7. As an alternative to the hose testing,other testing methods listed in 3.4.7 through 3.4.9 may be applicable
subject to adequacy of such testing methods being verified. See SOLAS regulation II-1/11.1. For watertight
Bulkheads (item 11.1) alternatives to the hose testing may only be used wherea hose test is not practicable.
8. A “Leak and structural test”,see 3.2.2 Is to be carried out for a representative cargo hold if intended for in-port
ballasting. The Filling level requirement for testing cargo holds intended for in-port ballasting is to be the
maximum loading that will occur in-port as indicated in the loading manual.
9. Where L.O. sump tanks and other similar spaces under main engines intended to hold liquid form part of the
watertight subdivision of the ship, they are to be tested as per the requirements of Item 5, Deep tanks other
than those listed elsewhere in this table.
10. Refer to 2.3

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Table A.6.2 Additional Test Requirements for Special Service Ships/Tanks

Type of Structures to be Test Head or

No. Type of Test Remarks
Ship/Tank tested Pressure
Refer to Rules for
Ships Carrying
1. Liquefied gas carriers Integral tanks Leak and structural Liquefied Gases in
Bulk (Pt.1, Vol.IX),
Sec. 4, E.4.25
Refer to Rules for Refer to Rules for
Hull structure
Ships Carrying Ships Carrying
supporting
Liquefied Gases in Liquefied Gases in
Membrane or semi-
Bulk (Pt.1, Vol.IX), Bulk (Pt.1, Vol.IX),
membrane tanks
Sec. 4, E.4.24 Sec. 4, E.4.24
Refer to Rules for Refer to Rules for
Ships Carrying Ships Carrying
Independent tanks
Liquefied Gases in Liquefied Gases in
type A
Bulk (Pt.1, Vol.IX), Bulk (Pt.1, Vol.IX),
Sec. 4, E.4.21 Sec. 4, E.4.21
Refer to Rules for Refer to Rules for
Ships Carrying Ships Carrying
Independent tanks
Liquefied Gases in Liquefied Gases in
type B
Bulk (Pt.1, Vol.IX), Bulk (Pt.1, Vol.IX),
Sec. 4, E.4.22 Sec. 4, E.4.22
Refer to Rules for Refer to Rules for
Ships Carrying Ships Carrying
Independent tanks
Liquefied Gases in Liquefied Gases in
type C
Bulk (Pt.1, Vol.IX), Bulk (Pt.1, Vol.IX),
Sec. 4, E.4.23 Sec. 4, E.4.23
The greater of
- top of the
Leak and
2. Edible liquid tanks Independent tanks overflow, or
Structural1
- to 0,9 m above
top of tank2
Where a cargo
The greater of tank is designed
- to 2,4 m above for the carriage
Integral or
Leak and top of tank2 , or of cargoes with
3. Chemical carriers independent cargo
structural1 - to top of tank2 specific
tanks
plus the design gravities larger
vapour pressure than 1,0,
see 3.4.1
Notes:
1 Refer to section 3.2.2
2 Top of tank is deck forming the top of the tank excluding any hatchways.

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Table A.6.3 Application of Leak Test, Coating and Provision of Safe Access for Type of Welded Joints

Coating1 Safe Access2

Type of welded joints Leak test
After leak test but
Before leak test Leak test Structural test
before Structural test
Not Not
Automatic Not required Allowed3 N/A
Butt required required
Manual or Semi Not
Required Not allowed Allowed Required
automatic4 required
Boundary
Not
Fillet including Required Not allowed Allowed Required
required
penetrations
Notes:
1. Coating refers to internal (tank/hold coating), where applied, and external (shell/deck) painting. It does not
refer to shop primer.
2. Temporary means of access for verification of the leak test.
3. The condition applies provided that the welds have been carefully inspected visually to the satisfaction of
the Surveyor.
4. Flux Core Arc Welding (FCAW) semiautomatic butt welds need not be tested provided that careful visual
inspections show continuous uniform weld profile shape, free from repairs, and the results of NDE testing
show no significant defects.

C. SOLAS Exempt/ Equivalent Ships

1. Application
1.1 Testing procedures are to be carried out in accordance with the requirements of B. in association with
the following alternative procedures of 3.2.2 “Testing Schedule for New Construction or Major Structural
Conversion”.
1.2 The tank boundaries are to be tested from at least one side. The tanks for structural test are to be
selected so that all representative structural members are tested for the expected tension and compression.
1.3 Structural tests are to be carried out for at least one tank of a group of tanks having structural
similarity (i.e. same design conditions, alike structural configurations with only minor localised differences
determined to be acceptable by the attending Surveyor) on each ship provided all other tanks are tested
for leaks by an air test. The acceptance of leak testing using an air test instead of a structural test does not
apply to cargo space boundaries adjacent to other compartments in tankers and combination carriers or to
the boundaries of tanks for segregated cargoes or pollutant cargoes in other types of ships.
1.4 Additional tanks may require structural testing if found necessary after the structural testing of the
first tank.
1.5 For tanks which are less than 2 m3 in volume, structural testing may be replaced by leak testing.
1.6 Where the structural adequacy of the tanks of a ship were verified by the structural testing required
by either Table A.6.1 or C.1.3, subsequent ships in the series (i.e. sister ships built from the same plans at
the same shipyard) may be exempted from structural testing of tanks, provided that:

1) Water-tightness of boundaries of all tanks and spaces are verified by leak tests and thorough
inspections are carried out.

2) Structural testing is carried out for at least one tank or space of each type among all tanks/ spaces of
each sister ship.

3) Additional tanks and spaces may require structural testing if found necessary after the structural
testing of the first tank or if deemed necessary by the attending Surveyor.

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For cargo space boundaries adjacent to other compartments in tankers and combination carriers or
boundaries of tanks for segregated cargoes or pollutant cargoes in other types of ships, structural tests
are to be carried out for at least one tank of a group of tanks having structural similarity (i.e. same design
conditions, alike structural configurations with only minor localized differences determined to be acceptable
by the attending Surveyor) on each vessel provided all other tanks are tested for leaks by an air test.
1.7 Sister ships built (i.e. keel laid) two years or more after the delivery of the last ship of the series, may
be tested in accordance with 1.6 at the discretion of BKI, provided that:

1) General workmanship has been maintained (i.e. there has been no discontinuity of shipbuilding or
significant changes in the construction methodology or technology at the yard, shipyard personnel
are appropriately qualified and demonstrate an adequate level of workmanship as determined by
BKI); and

2) An NDT plan is implemented and evaluated by BKI for the tanks not subject to structural tests.
Shipbuilding quality standards for the hull structure during new construction are to be reviewed and
agreed during the kick-off meeting. The work is to be carried out in accordance with the Rules and
under survey of BKI.

D. Non-SOLAS Ships
1. Application
1.1 Testing procedures are to be carried out in accordance with the requirements of B in association with
the following alternative procedures for B.3.2.2 “Testing Schedule for New Construction or Major Structural
Conversion”.
1.2 The tank boundaries are to be tested from at least one side. The tanks for structural test are to be
selected so that all representative structural members are tested for the expected tension and compression.
1.3 The requirements given in Table A-6.1 to structurally test tanks to 2,4 metres above the top of the tank
do not apply. Instead, the minimum test pressure for structural testing is to be taken as 0,3D + 0,76 metres
above the top of the tank where the top of the tank is the deck forming the top of the tank, excluding any
hatchways and D is the depth of the ship. The minimum test pressure need not be taken greater than 2,4
metres above the top of the tank.
1.4 Structural tests are to be carried out for at least one tank of a group of tanks having structural
similarity (i.e. same design conditions, alike structural configurations with only minor localised differences
determined to be acceptable by the attending Surveyor) on each vessel provided all other tanks are tested
for leaks by an air test. The acceptance of leak testing using an air test instead of a structural test does not
apply to cargo space boundaries adjacent to other compartments in tankers and combination carriers or
the boundaries of tanks for segregated cargoes or pollutant cargoes in other types of ships.
1.5 Additional tanks may require structural testing if found necessary after the structural testing of the
first tank.
1.6 For tanks which are less than 2 m3 in volume, structural testing may be replaced by leak testing.
1.7 Where the structural adequacy of the tanks and spaces of a vessel were verified by the structural
testing required by either B or D.1.4, subsequent vessels in the series (i.e. sister ships built from the same
plans at the same shipyard) may be exempted from structural testing of tanks, provided that:

1) water-tightness of boundaries of all tanks and spaces are verified by leak tests and thorough
inspections are carried out.

2) structural testing is carried out for at least one tank or space among all tanks/spaces of each sister
vessel.

3) additional tanks and spaces may require structural testing if found necessary after the structural
testing of the first tank or if deemed necessary by the attending Surveyor.

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For cargo space boundaries adjacent to other compartments in tankers and combination carriers or
boundaries of tanks for segregated cargoes or pollutant cargoes in other types of ships, structural tests
are to be carried out for at least one tank of a group of tanks having structural similarity (i.e. same design
conditions, alike structural configurations with only minor localised differences determined to be acceptable
by the attending Surveyor) on each vessel provided all other tanks are tested for leaks by an air test.
1.8 Sister ships built (i.e. keel laid) two years or more after the delivery of the last ship of the series, may
be tested in accordance with 1.7 at the discretion of BKI, provided that:

1) general workmanship has been maintained (i.e. there has been no discontinuity of shipbuilding or
significant changes in the construction methodology or technology at the yard, shipyard personnel
are appropriately qualified and demonstrate an adequate level of workmanship as determined by
BKI); and

2) an NDT plan is implemented and evaluated by BKI for the tanks not subject to structural tests.
Shipbuilding quality standards for the hull structure during new construction are to be reviewed and
agreed during the kick-off meeting. The work is to be carried out in accordance with the Rules and
under survey of BKI.

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A.7 Definitions
Adequate means for protection against corrosion (Propeller and Tube Shaft)
An adequate means for protection against corrosion is an approved means for full protection of the core
shaft against sea water intrusion and subsequent corrosion attack. Such means are used for the protection
of common steel material against corrosion particularly in combination with water lubricated bearings.
Typical means are for example:

— continuous metallic, corrosion resistant liners, continuous cladding,

— multiple layer synthetic coating,

— multiple layer of fiberglass,

— combinations of above mentioned,

— rubber / elastomer covering coating.

The means for protection against corrosion are installed / applied according to class approved procedures.
Air pipe head
Air pipe heads installed on the exposed decks are those extending above the freeboard deck or
superstructure decks.
Alternative means (Propeller and Tube Shaft)
”Alternative Means: are shafting arrangements with configuration other than described in the present
document.”
Bulk Carrier
Ship which is constructed generally with single deck, double bottom, topside tanks and hopper side tanks
in cargo spaces, and is intended primarily to carry dry cargo in bulk. Combination carriers are included. Ore
and combination carriers are not covered by Rules for Bulk Carrier and Oil Tanker (Pt.1, Vol.XVII) .
The ship type notation ”BULK CARRIER”, or equivalent, and the notation ”ESP” shall be assigned to sea
going self-propelled ships8) which are constructed generally with single deck, double bottom, hopper side
tanks and topside tanks and with single or double side skin construction in cargo length area and intended
primarily to carry dry cargoes in bulk. Typical midship sections are given in Fig. A.7.1.

Figure A.7.1 Typical midship section

Ballast Tank
A Ballast Tank is a tank that is being used primarily for salt water ballast.
Cargo Area
8)
Self-propelled ships are ships with mechanical means of propulsion not requiring assistance from another ship during normal
operation.

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Cargo Area is that part of the ship which contains cargo tanks, slop tanks and cargo/ballast pump-rooms,
cofferdams, ballast tanks and void spaces adjacent to cargo tanks and also deck areas throughout the entire
length and breadth of the part of the ship over the above-mentioned spaces.
Cargo Length Area
Cargo Length Area is that part of the ship which includes cargo holds and adjacent areas including fuel tanks,
cofferdams, ballast tanks and void spaces.
Close Loop (system) Oil Lubricated bearing (Propeller and Tube Shaft)
Closed loop oil lubricating systems use oil to lubricate the bearings and are sealed against the environment
(seawater) by adequate sealing / gland devices.
Closed Loop System Fresh Water Lubricated Bearing (Propeller and Tube Shaft)
Closed loop water lubricating systems use fresh water to lubricate the bearings and are sealed against the
environment (such as seawater) by adequate sealing / gland devices.
Chemical Tanker
A ship constructed or adapted and used for the carriage in bulk of any liquid product listed in Chapter 17 of
the International Code for The Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk,
IBC Code.
The ship type notation “CHEMICAL TANKER”, or equivalent, and the notation “ESP” shall be assigned to
sea going self-propelled ships8) which are constructed generally with integral tanks and intended primarily
to carry chemicals in bulk. This type notation shall be assigned to tankers of both single or double hull
construction, as well as tankers with alternative structural arrangements. Typical midship sections are given
in Fig. A.7.2.

Figure A.7.2 Typical midship section

Combination Carrier
1. “Combination carrier” is a general term applied to ships intended for the carriage of both oil and dry
cargoes in bulk; these cargoes are not carried simultaneously, with the exception of oily mixture retained
in slop tanks. The ship types defined in 2. and 3. below shall be considered to be combination carriers.
2. The ship type notation ”OIL/BULK/ORE (OBO) CARRIER”, or equivalent, and the notation ”ESP” shall
be assigned to sea going self-propelled ships8) which are constructed generally with single deck, double
bottom, hopper side tanks and topside tanks, and with single or double side skin construction in the cargo
length area, and intended primarily to carry oil or dry cargoes, including ore, in bulk. Typical midship
sections are given in Fig. A.7.3.
Note:
OIL/BULK/ORE carriers that do not comply with MARPOL I/19 may be subject to International and/or
National Regulations requiring phase out.

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Figure A.7.3 Typical midship section

3. The ship type notation ’ORE/OIL CARRIER”, or equivalent, and the notation ”ESP” shall be assigned
to sea going self-propelled ships8) which are constructed generally with single deck, two longitudinal
bulkheads and a double bottom throughout the cargo length area and intended primarily to carry ore
cargoes in the centre holds or of oil cargoes in centre holds and wing tanks. Typical midship sections are
given in Fig. A.7.4.
Note:
ORE/OIL carriers that do not comply with MARPOL I/19 may be subject to International and/or National
Regulations requiring phase out.

Figure A.7.4 Typical midship section

Conditions of Class
Conditions of class mean requirements to the effect that specific measures, repairs, surveys etc. are to be
carried out within a specific time limit in order to retain Classification.
Corrosion Prevention System
A Corrosion Prevention System is normally considered a full hard protective coating. Hard Protective
Coating is usually to be epoxy coating or equivalent. Other coating systems, which are neither soft nor
semi-hard coatings, may be considered acceptable as alternatives provided that they are applied and
maintained in compliance with the manufacturer’s specifications.
Corrosion Resistant Shaft (Propeller and Tube Shaft)
Corrosion resistant shaft is made in approved corrosion resistant steel as core material for the shaft.

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Close Up Survey
A survey where the details of structural components are within the close visual inspection range of the
surveyor, i.e. normally within reach of hand.
Coating Condition
Coating condition is defined as follows:

GOOD condition with only minor spot rusting.

FAIR condition with local breakdown at edges of stiffeners and weld connections and/or light
rusting over 20% or more of areas under consideration, but less than as defined for POOR
condition.

POOR condition with general breakdown of coating over 20% or more of areas or hard scale at
10% or more of areas under consideration

Critical Structural Area

Locations which have been identified from calculations to require monitoring of from the service history of
the subject ship or from similar ships or sister ships, if applicable, to be sensitive to cracking, buckling or
corrosion which would impair the structural integrity of the ship.
Double class vessel
A vessel which is classed by two Societies and where each Society works as if it is the only Society classing
the vessel, and does all surveys in accordance with its own requirements and schedule.
Double Hull Oil Tanker
A ship which is constructed primarily for the carriage of oil in bulk, which have the cargo tanks protected by
a double hull which extends for the entire length of the cargo area, consisting of double sides and double
bottom spaces for the carriage of water ballast or void spaces.
Double Skin Bulk Carrier
A ship which is constructed generally with single deck, double bottom, top-side tanks and hopper side tanks
in cargo spaces, and is intended primarily to carry dry cargo in bulk, including such types as ore carriers and
combination carriers, in which all cargo holds are bounded by a double-side skin (regardless of the width
of the wing space). Ore and combination carriers are not covered by Rules for Bulk Carrier and Oil Tanker
(Pt.1, Vol.XVII)
Dual class vessel
A vessel which is classed by two Societies between which there is a written agreement regarding sharing of
work.
First Society
First Society’ is a Society classing a vessel which, under request of the Owner, enters a double or dual class
arrangement with another Society.
Flanged connection (Propeller and Tube Shaft)
Flanged connection is the coupling Methodology, between the shaft and the propeller, achieved by a flange,
built in at the shaft aft end, bolted to propeller boss.
Fresh Water sample test (Propeller and Tube Shaft)
Fresh water sample test should be carried out at regular intervals not exceeding six (6) months. Samples
are to be taken under service conditions and are to be representative of the water circulating within the
stern tube. Analysis results are to be retained on board and made available to the surveyor.

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At time of survey the sample for the test has to be taken at the presence of the surveyor. Fresh water
sample test shall include the following parameters:
— chlorides content,
— pH value,
— presence of bearing particles or other particles (only for laboratory analysis, not required for tests
carried out in presence of the surveyor).

Gaining Society
Means a Classification Society which accepts a vessel for its classification only after all overdue surveys; and
overdue conditions of class previously issued against the vessel have been completed by or as specified by
the losing Society.
Grooving Corrosion
Grooving corrosion is typically local material loss adjacent to weld joints along abutting stiffeners and at
stiffener or plate butts or seams.
Keyless connection (Propeller and Tube Shaft)
Keyless connection is the forced coupling Methodology between the shaft and the propeller without a key
achieved through interference fit of the propeller boss on the shaft tapered end.
Keyed connection (Propeller and Tube Shaft)
Keyed connection is the forced coupling Methodology between the shaft and the propeller with a key and
keyway achieved through the interference fit of the propeller boss on the shaft tapered end.
Locking device
A device that locks a securing device in the closed position.
Losing society
Means the Classification Society from which class is being transferred. In the case of vessels classed by more
than one Society, ‘losing Society’ means all Classification Societies from which class is being transferred.
Lubricating oil analysis (Propeller and Tube Shaft)
Lubricating oil analysis is to be carried out at regular intervals not exceeding six (6) months taking into
account Guidance for Marine Industry (Pt.1, Vol.AC) Sec.2.R-36. The documentation on lubricating oil
analysis is to be available on board. Oil samples, to be submitted for the analysis, should be taken under
service conditions.
Ore carrier
The ship type notation ”ORE CARRIER”, or equivalent, and the notation ”ESP” shall be assigned to sea going
self-propelled ships8) which are constructed generally with single deck, two longitudinal bulkheads and a
double bottom throughout the cargo length area and intended primarily to carry ore cargoes in the centre
holds only. Typical midship section are given in Fig. A.7.5.

Figure A.7.5 Typical midship section

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Oil sample examination (Propeller and Tube Shaft)

An oil sample examination is a visual examination of the stern tube lubricating oil taken in presence of the
surveyor with a focus on water contamination.
Oil Tanker
A ship which is constructed primarily to carry oil in bulk in cargo tanks forming an integral part of the ships
/footnote hull, including ship types such as combination carriers (Ore/Oil ships etc.). but excluding ships
carrying oil in independent tanks not part of the ship’s hull such as asphalt carriers.
The ship type notation ”OIL TANKER”, or equivalent, and the notation ”ESP” shall be assigned to sea going
self-propelled ships8) which are constructed with integral cargo tanks and intended primarily to carry oil in
bulk. This type notation shall be assigned to tankers of both single and double hull construction, as well as
tankers with alternative structural arrangements, e.g. mid-deck designs. Typical midship sections are given
in Fig. A.7.6.
Note:
OIL/BULK/ORE carriers that do not comply with MARPOL I/19 may be subject to International and/or
National Regulations requiring phase out.

Figure A.7.6 Typical midship section

Open Systems (water) (Propeller and Tube Shaft)

Open water lubricating systems use water to lubricate the bearings and are exposed to the environment.
Overall Survey
A survey intended to report on the overall condition of the hull structure and determine the extent of
additional Close-up Surveys.
Outstanding
Outstanding means still to be dealt with.
Overdue
Overdue means overdue on the date the losing Society receives the request by the gaining Society for its
current classification survey status.
Prompt and Thorough Repair
Permanent repair completed at the time of survey to the satisfaction of the surveyor, therein removing the
need for the imposition of any associated condition of class.

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Propeller Shaft (Propeller and Tube Shaft)

Propeller shaft is the part of the propulsion shaft to which the propeller is fitted. It may also be called screw
shaft or tail shaft.
Representative Space
Those which are expected to reflect the condition of other Spaces of similar type and service and with
similar corrosion prevention systems. When selecting Representative Spaces account is to be taken of the
service and repair history on board and identifiable Critical Structural Areas and/or Suspect Areas.
Remaining Society
Remaining Society is a Society which keeps an existing vessel in class, when the class by the other Society
involved in the double or dual class arrangement is suspended or withdrawn.
Remote Inspection Techniques (RIT)
Remote Inspection Technique is a means of survey that enables examination of any part of the structure
without the need for direct physical access of the surveyor (refer to Guidance for Marine Industry (Pt.1,
Vol.AC) Sec.3.R-42).
Renewal Thickness
The minimum allowable thickness, in mm, below which renewal of structural members is to be carried out.
Ro-Ro Ship
Ship is a ship fitted with which utilizes a loading ramp which to enables wheeled vehicles to be rolled-on
and rolled-off the ship.
Ro-Ro passenger ship (Ro-Pax)
Passenger ship with Ro-Ro spaces or special category spaces.
Ro-Ro spaces
Ro-Ro spaces - spaces not normally sub-divided in any way and normally extending to either a substantial
length or the entire length of the ship, in which motor vehicles with fuel in their tanks for their own
propulsion and / or goods (packaged or in bulk, in or on rail or road cars, vehicles (including road or
rail tankers), trailers, containers, pallets, demountable tanks or in or on similar stowage units or, other
receptacles) can be loaded and unloaded normally in a horizontal direction.
Indonesian Safety regulation
Regulations issued by Indonesian Government as a flag State of the ships.
Second Society
Second Society is a Society which is requested by an Owner to accept an existing vessel already classed by
another Society into its class under double or dual class arrangement.
Securing device
A device used to keep the door closed by preventing it from rotating about its hinges.
Self-Unloading Bulk Carriers
The ship type notation “SELF-UNLOADERS”, or equivalent, and the notation ”ESP” shall be assigned to sea
going self-propelled ships8) which are constructed generally with single deck, double bottom, hopper side
tanks and topside tanks and with single or double side skin construction in cargo length area and intended
to carry and self-unload dry cargoes in bulk. Typical midship sections are given in Fig. A.7.7.

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Figure A.7.7 Typical midship sections

Spaces
Spaces are separate compartments including holds, tanks, cofferdams and void spaces bounding cargo
holds, decks and the outer hull.
Special category spaces
Special category spaces - those enclosed vehicle spaces above or below the bulkhead deck, into and
from which vehicles can be driven and to which passengers have access. Special category spaces may be
accommodated on more than one deck provided that the total overall clear height for vehicles does not
exceed 10m.
Service records (Propeller and Tube Shaft)
Service records are regularly recorded data showing in-service conditions of the shaft(s) and may include, as
applicable: lubricating oil temperature, bearing temperature and oil consumption records (for oil lubricated
bearings) or water flow, water temperature, salinity, pH, make-up water and water pressure (for closed loop
fresh water lubricated bearings depending on design).
Shaft (Propeller and Tube Shaft)
For the purpose of this Unified Requirement shaft is a general definition that could mean:

— Propeller shaft

— Tube shaft

Special Consideration
Special Consideration or specially considered (in connection with close-up surveys and thickness
measurements) means sufficient close-up inspection and thickness measurements are to be taken to
confirm the actual average condition of the structure under the coating.
Stern tube (Propeller and Tube Shaft)
Tube or pipe fitted in the shell of a ship at the stern (or rear part of the ship), below the water- line, through
which passes the tube shaft or aftermost section of the propeller-shaft.
Stern tube is the housing of the shaft bearings, generally two (one aft and one fore), that sustain the shaft
and allows its rotation with less frictional resistance. The stern tube also accommodates the shaft sealing
arrangement.
The definition does not include the intermediate shaft(s) which is (are) considered part of the propulsion
shafting inside the vessel.
Stern tube Sealing System (Propeller and Tube Shaft)

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Stern tube Sealing system is the equipment installed on the inboard extremity and, for closed systems, at
outboard extremity of the stern tube.
Inboard Seal is the device fitted on the fore part of the stern tube that achieve the sealing against the
possible leakage of the lubricant media in to the ship internal.
Outboard seal is the device fitted on the aft part of the stern tube that achieve the sealing against the
possible sea water ingress and the leakage of the lubricant media.
Substantial Corrosion
An extent of corrosion such that assessment of corrosion pattern indicates wastage in excess of 75% of
allowable margins, but within acceptable limits. For vessels built under Rules for Bulk Carrier and Oil Tanker
(Pt.1, Vol.XVII) , substantial corrosion is an extent of corrosion such that the assessment of the corrosion
pattern indicates a measured thickness between tren + 0,5 mm and tren where tren is the renewal thickness
as defined in this sub-annex.
Supporting device
A device used to transmit external or internal loads from the door to a securing device and from the securing
device to the ship’s structure, or a device other than a securing device, such as a hinge, stopper or other
fixed device, that transmits loads from the door to the ship’s structure.
Suspect Area
Locations showing Substantial Corrosion and/or are considered by the surveyor to be prone to rapid
wastage.
Total Loss
A constructive total loss is a situation where the cost of repairs plus the cost of salvage equal or exceed the
value of the vessel. It also covers cases where the vessel has been abandoned in the reasonable belief that
a total loss is inevitable. The calculation can be affected by environmental cleanup costs.
Transverse Section
A Transverse Section includes all longitudinal members such as plating, longitudinals and girders at the
deck, sides, bottom, inner bottom and hopper side plating, longitudinal bulkheads and bottom plating in
top wing tanks. For transversely framed vessels, a transverse section includes adjacent frames and their
end connections in way of transverse sections.
Tube Shaft (Propeller and Tube Shaft)
Tube shaft is a shaft placed between the intermediate shaft and propeller shaft, normally arranged within
a stern tube or running in open water. It may also be called Stern Tube Shaft.
Water Lubricated Bearing (Propeller and Tube Shaft)
Water lubricated bearings are bearings cooled / lubricated by water (fresh or salt).
Withdrawing Society
Withdrawing Society’ is a Society which withdraws its class to an existing vessel in class under double or
dual class arrangement. The withdrawing Society is sometimes referred to simply as the “losing”, when the
context is obvious.

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Annex A Annexes to Section 1-3 A.8

A.8 List of Contact Points for Changing Classification Status

Table A.8.1 List of Contact Points for Changing Classification Status

Office / Person in
Society Tel. Number Fax Number e-mail address
Department charge
+ 62 21 4301017 + 62 21 43936175
PT. BIRO
Head of
KLASIFIKASI
BKI Survey Or Or svy@bki.co.id
INDONESIA
Division
(Head Office)
+62 21 4301703 +62 21 43901973

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Annex B Annexes to Section 4-I

Annex B Annexes to Section 4-I

B.1 Owner’s Inspection Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
B.2 Example of Survey Programme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
B.3 Survey Planning Questionnaire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
B.4 Technical Assessment in Conjunction with the Planning of Enhanced Surveys for Class
Renewal Survey Hull . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
B.5 Requirements for Extent of Thickness Measurement at Areas of Substantial Corrosion . . . B-16
B.6 Guidelines for the Gauging of the Vertically Corrugated Transverse Watertight Bulkhead
Between Holds No. 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26
B.7 Guidelines for the Thickness Measurements of Side Shell Frames and Brackets in Single-Side
Skin Bulk Carriers Required to Comply with URS 31 . . . . . . . . . . . . . . . . . . . . . B-29
B.8 Additional Annual Survey Requirements for the Foremost Cargo Hold of Ships Subject to
Regulation XII/9 of the Convention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-32
B.9 Strength of Cargo Hatch Cover Securing Arrangements for Bulk Carriers . . . . . . . . . . B-33
B.10 Criteria for Longitudinal Strength of Hull Girder for Oil Tankers . . . . . . . . . . . . . . . B-33
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-33
B. Evaluation of longitudinal strength . . . . . . . . . . . . . . . . . . . . . . . . . . B-33
C. Sampling method of thickness measurements for longitudinal strength evaluation
and repair methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-34
B.11 Renewal Criteria for Side Shell Frames and Brackets in Single Side Skin Bulk Carriers and
Single Side Skin OBO Carriers not Built in accordance with UR S12 Rev.1 or subsequent
revisions (UR S31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-35
B.12 ESP Survey Reporting Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-46
B.13 Recommended Procedures for Thickness Measurements . . . . . . . . . . . . . . . . . . B-63
A. Recommended Procedures for Thickness Measurements of Ships . . . . . . . . . B-63
B. Recommended Procedures for Thickness Measurements of Ships Built According to
The Net Scantling Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-73
C. Recommended Procedures for Thickness Measurements of Bulk Carriers . . . . . B-100
D. Recommended Procedures for Thickness Measurements of Double Hull Oil Tankers B-118
E. Recommended Procedures for Thickness Measurements of Double Skin Bulk CarriersB-134

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Annex B Annexes to Section 4-I B.1

B.1 Owner’s Inspection Report

Owner’s inspection report – Structural condition

- Ship’s name:
- For tank/hold No:
- Grade of steel: deck : side :
bottom : longitudinal bulkhead :
Coating Modification
Elements Cracks Buckles Corrosion Pitting Other
condition /Repair
Deck

Bottom

Side

Side framing

Long. Bulkheads

Trans. Bulkheads

- Repairs carried out due to:

- Thickness measurements carried out (dates):
- Results in general:
- Overdue surveys:
- Outstanding conditions of class:

- Comments:

Date of inspection : .....................................................................................................................

Inspected by : .....................................................................................................................
Signature : .....................................................................................................................

B.2 Example of Survey Programme

Basic information and particulars

Name of ship:
IMO number:
Flag State:
Port of registry:
Gross tonnage:
Deadweight (metric tonnes):
Length between perpendiculars (m):
Shipbuilder:
Hull number:
Recognized organization (RO):
RO ship identity:
Date of build of the ship:
Owner:
Thickness measurement firm:

Prepared by the owner in cooperation with BKI:

Date: ………………………………………… (name and signature of authorized owner’s representative)
Date: ………………………………………… (name and signature of authorized BKI Surveyor)

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1. Preamble
1.1 Scope
1.1.1 The present survey programme covers the minimum extent of overall surveys, close-up surveys,
thickness measurements and pressure testing within the cargo length area, cargo holds, ballast tanks,
including fore and aft peak tanks, required by the Rules in Section 4-I.
1.1.2 The arrangements and safety aspects of the survey should be acceptable to the attending
surveyor(s).

1.2 Documentation

All documents used in the development of the survey programme should be available on board during the
survey as required by Section 4-I.A.3.

2. Arrangement of cargo holds, tanks and spaces

This section of the survey programme should provide information (either in the form of plans or text) on
the arrangement of cargo holds, tanks and spaces that fall within the scope of the survey.

3. List of cargo holds, tanks and spaces with information on their use, extent of coatings and corrosion
prevention system

This section of the survey programme should indicate any changes relating to (and should update) the
information on the use of the holds and tanks of the ship, the extent of coatings and the corrosion
prevention system provided in the survey planning questionnaire.

4. Conditions for survey

This section of the survey programme should provide information on the conditions for survey, e.g.
information regarding cargo hold and tank cleaning, gas freeing, ventilation, lighting, etc.

5. Provisions and method of access to structures

This section of the survey programme should indicate any changes relating to (and should update) the
information on the provisions and methods of access to structures provided in the survey planning
questionnaire.

6. List of equipment for survey

This section of the survey programme should identify and list the equipment that will be made available for
carrying out the survey and the required thickness measurements.

7. Survey requirements
7.1 Overall survey

This section of the survey programme should identify and list the spaces that should undergo an overall
survey for this ship.

7.2 Close-up survey

This section of the survey programme should identify and list the hull structures that should undergo a
close-up survey for this ship.

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8. Identification of tanks for tank testing

This section of the survey programme should identify and list the cargo holds and tanks that should undergo
tank testing for this ship.

9. Identification of areas and sections for thickness measurements

This section of the survey programme should identify and list the areas and sections where thickness
measurements should be taken.

10. Minimum thickness of hull structures

This section of the survey programme should specify the minimum thickness for hull structures of this ship
that are subject to survey, according to (a) or (b):
(a) Determined from the attached wastage allowance table and the original thickness to the hull
structure plans of the ship;
(b) Given in the following table(s):

Original as-built Minimum thickness Substantial corrosion

Area or location
thickness (mm) (mm) thickness (mm)
Deck
Plating
Longitudinals
Longitudinal girders
Cross deck plating
Cross deck stiffeners
Bottom
Plating
Longitudinals
Longitudinal girders
Inner bottom
Plating
Longitudinals
Longitudinal girders
Floors
Ship side in way of topside tanks
Plating
Longitudinals
Ship side in way of hopper side
tanks
Plating
Longitudinals
Ship side in way of tanks (if
applicable)
Plating
Longitudinals
Longitudinal stringers
Ship side in way of cargo holds
Plating
Side frames webs
Side frames flanges
Upper brackets webs
Upper brackets flanges
Lower brackets webs
Lower brackets flanges

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Continued from previous table

Original as-built Minimum thickness Substantial corrosion
Area or location
thickness (mm) (mm) thickness (mm)
Longitudinal bulkhead (if
applicable)
Plating
Longitudinals (if applicable)
Longitudinal girders (if applicable)
Transverse bulkheads
Plating
Stiffeners (if applicable)
Upper stool plating
Upper stool stiffeners
Lower stool plating
Lower stool stiffeners
Transverse web frames in topside
tanks
Plating
Flanges
Stiffeners
Transverse web frames in hopper
tanks
Plating
Flanges
Stiffeners
Hatch covers
Plating
Stiffeners
Hatch coamings
Plating
Stiffeners

Note:
The wastage allowance tables should be attached to the survey programme.

11. Thickness measurement firm

This section of the survey programme should identify changes, if any, relating to the information on the
thickness measurement firm provided in the survey planning questionnaire.

12. Damage experience related to the ship

This section of the survey programme should, using the tables provided below, provide details of the hull
damages for at least the last three years in way of the cargo holds, ballast tanks and void spaces within the
cargo length area. These damages are subject to survey.
Hull damages sorted by location for this ship

Cargo hold, tank or

Possible cause, Description of Date of
space number or Location Repair
if known the damages repair
area

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Hull damages for sister or similar ships (if available) in the case of design-related damage

Cargo hold, tank or

Possible cause, Description of Date of
space number or Location Repair
if known the damages repair
area

13. Areas identified with substantial corrosion from previous surveys

This section of the survey programme should identify and list the areas of substantial corrosion from
previous surveys.

14. Critical structural areas and suspect areas

This section of the survey programme should identify and list the critical structural areas and the suspect
areas, when such information is available.

15. Other relevant comments and information

This section of the survey programme should provide any other comments and information relevant to the
survey.

B.3 Survey Planning Questionnaire

1. The following information will enable the owner in cooperation with the Administration to develop a
survey programme complying with the requirements of the Rules. It is essential that the owner provides,
when completing the present questionnaire, up-to-date information. The present questionnaire, when
completed, should provide all information and material required by the Rules.
Particulars
Ship’s name:
IMO number:
Flag State:
Port of registry:
Owner:
Recognized organization:
RO Ship identity:
Gross tonnage:
Deadweight (metric tonnes):
Date of build:

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2. Information on access provision for close-up surveys and thickness measurement:

The owner should indicate, in the table below, the means of access to the structures subject to close-up
survey and thickness measurement. A close-up survey is an examination where the details of structural
components are within the close visual inspection range of the attending surveyor, i.e. normally within
reach of hand.

Hold/Tank Temporary Direct Other means

Structure Rafts Ladders
No. staging access (please specify)
F.P. Fore peak
A.P. Aft peak
Hatch side coamings
Cargo
Topside sloping
holds
plate
Upper stool plating
Cross deck
Side shell, frames
Cargo and brackets
holds Transverse bulkhead
Hopper tank plating
Lower stool
Tank top
Under deck
structure
Topside
Side shell and
tanks
structure
Sloping plate and
structure
Webs and
bulkheads
Hopper sloping
Hopper
plate and structure
tanks
Side shell and
structure
Bottom structure
Webs and bulkheads
Hopper
Double-bottom
tanks
structure
Upper stool internal
structure
Lower stool internal
structure
History of bulk cargoes of a corrosive nature (e.g. high sulphur content)

3. Owner’s inspections
Using a format similar to that of the table below (which is given as an example), the owner should provide
details of the results of their inspections, for the last 3 years in accordance with the Rules on all cargo holds
and ballast tanks and void spaces within the cargo area.

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Tank/Hold Corrosion Coating Coating Structural Hold and tank

No. protection (1) extent (2) condition (3) deterioration (4) history (5)
Cargo
tanks/holds
Topside tanks
Hopper tanks
Double-side skin
tanks
Double-bottom
tanks
Upper stools
Lower stools
Ballast Tank
Fore peak
Aft peak
Miscellaneous
other spaces:
Note:
Indicate tanks which are used for oil/ballast.
(1) HC = hard coating; SC = soft coating;
SH = semi-hard coating; NP = no protection
(2) U = upper part; M = middle part;
L = lower part; C = complete
(3) G = good; F = fair; P = poor;
RC = recoated (during the last three years)
(4) N = no findings recorded; Y = findings recorded, description of findings should be attached to this questionnaire
(5) DR = Damage & Repair; L = Leakages;
CV = Conversion (description to be attached to this questionnaire)

Name of owner’s representative:…………………………………………………….

Signature:…………………………………………………………………………………………

Date: ……………………………………………………………………………………………….
Reports of port State control inspections

List the reports of port State control inspections containing hull structural related deficiencies and relevant
information on rectification of the deficiencies:

Safety management system

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List non-conformities related to hull maintenance including the associated corrective actions:

Name and address of the approved thickness measurement firm:

B.4 Technical Assessment in Conjunction with the Planning of Enhanced

Surveys for Class Renewal Survey Hull
1. Introduction

These Annex contain information and suggestions concerning technical assessments which may be of use
in conjunction with the planning of enhanced renewal examination. As indicated in Section 4-I, this Annex
are a recommended tool which may be invoked at the discretion of BKI, when considered necessary and
appropriate, in conjunction with the preparation of the required survey programme. Following references
may be observed if necessary.

— Reference 1: TSCF “Guidelines Manual for the Inspection and Condition Assessment of Tanker
Structures, 1986”

— Reference 2: TSCF “Condition Evaluation and Maintenance of Tanker Structures, 1992”

— Reference 3: TSCF “Guidelines for the Inspection and maintenance of Double Hull Tanker Structures,
1995.”

— Reference 4: TSCF “Guidelines Manual for Tanker Structures, 1997.”

— Reference 5 : IACS “Bulk Carriers : Guidelines for Surveys, Assessment and Repair of Hull Structures”

2. Purpose and principles

2.1 Purpose

The purpose of the technical assessments described in these Annex is to assist in identifying critical
structural areas, nominating suspect areas and in focusing attention on structural elements or areas of
structural elements which may be particularly susceptible to, or evidence a history of, wastage or damage.
This information may be useful in nominating locations, areas, holds and tanks for thickness measurement,
close-up survey and tank testing.
Critical structural areas are locations which have been identified from calculations to require monitoring
or from the service history of the subject ship or from similar or sister ships (if available) to be sensitive to
cracking, buckling or corrosion which would impair the structural integrity of the ship.

2.2 Minimum requirements

These Annex may not be used to reduce the requirements of Close up and Thickness measurement
in Section 4-I and relevant requirement for close-up survey, thickness measurement and tank testing,
respectively, which are, in all cases, to be complied with as a minimum.

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2.3 Timing

As with other aspects of survey planning, the technical assessments described in these Annex should be
completed by the owner or operator in cooperation with BKI in advance of the commencement of the class
renewal survey, i.e. prior to commencing the survey and normally at least 12 to 15 months before the
survey’s completion due date.

2.4 Aspects to be considered

2.4.1 Technical assessments, which may include quantitative or qualitative evaluation of relative risks of
possible deterioration, of the following aspects of a particular ship may be used as a basis for the nomination
of holds, tanks and areas for survey:
— design features such as stress levels on various structural elements, design details and extent of use
of high-tensile steel;
— former history with respect to corrosion, cracking, buckling, indents and repairs for the particular
ship as well as similar vessels, where available; and
— information with respect to types of cargo carried, protection of tanks, and condition of coating, if
any, of holds and tanks.
2.4.2 Technical assessments of the relative risks of susceptibility to damage or deterioration of various
structural elements and areas should be judged and decided on the basis of recognized principles and
practices.

3. Technical assessment
3.1 General
3.1.1 There are three basic types of possible failure which may be the subject of technical assessment in
connection with planning of surveys: corrosion, cracks and buckling. Contact damages are not normally
covered by the survey plan since indents are usually noted in memoranda and assumed to be dealt with as
a normal routine by surveyors.
3.1.2 Technical assessments performed in conjunction with the survey planning process should, in
principle, be as shown schematically in Fig. B.4.1 which depicts, schematically, how technical assessments
can be carried out in conjunction with the survey planning process. The approach is based on an evaluation
of experience and knowledge basically related to:
1) design; and
2) corrosion.
3.1.3 The design should be considered with respect to structural details which may be susceptible to
buckling or cracking as a result of vibration, high stress levels or fatigue.
3.1.4 Corrosion is related to the ageing process, and is closely connected with the quality of corrosion
protection at new building, and subsequent maintenance during the service life. Corrosion may also lead
to cracking and/or buckling.

3.2 Methods
3.2.1 Design details
.1 Damage experience related to the ship in question and similar ships, where available, is the main source
of information to be used in the process of planning. In addition, a selection of structural details from the
design drawings should be included.
.2 Typical damage experience to be considered will consist of:

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— number, extent, location and frequency of cracks; and

— location of buckles.

This information may be found in the survey reports and/or the owner’s files, including the results of the
owner’s own inspections. The defects should be analysed, noted and marked on sketches.
In addition, general experience should be utilized. For example, Fig. B.4.2 shows typical locations in bulk
carriers which experience has shown may be susceptible to structural damage. Also, reference1) should
be made which contains a catalogue of typical damages and proposed repair methods for various ship
structural details.
Such figures should be used together with a review of the main drawings, in order to compare with the
actual structure and search for similar details which may be susceptible to damage. An example is shown
in Fig. B.4.3 and Fig. B.4.4.
In particular, Chapter 3 of Ref.3 deals with various aspects specific to double hull tankers, such as stress
concentration locations, misalignment during construction, corrosion trends, fatigue considerations and
areas requiring special attention, which are to be considered in working out the survey planning. While
Chapter 4 of Ref. 3 addresses experience gained on structural defects in double hulls (chemical tankers, OBO
carriers, ore/oil carriers, gas carriers), which are also to be considered in working out the survey planning.
The review of the main structural drawings, in addition to using the above-mentioned figures, should
include checking typical design details where cracking has been experienced. The factors contributing to
damage should be carefully considered.
The use of high-tensile steel (HTS) is an important factor. Details showing good service experience where
ordinary, mild steel has been used may be more susceptible to damage when HTS, and its higher associated
stresses, are utilized. There is extensive and, in general, good experience with the use of HTS for longitudinal
material in deck and bottom structures. Experience in other locations, where the dynamic stresses may be
higher, is less favourable, e.g. side structures.
In this respect, stress calculations of typical and important components and details, in accordance with
relevant methods, may prove useful and should be considered.
The selected areas of the structure identified during this process should be recorded and marked on the
structural drawings to be included in the survey programme.

3.2.2 Corrosion
In order to evaluate relative corrosion risks, the following information is generally to be considered:

— usage of tanks, holds and spaces;

— condition of coatings;

— cleaning procedures;

— previous corrosion damage;

— ballast use and time for cargo holds;

— risk of corrosion in cargo holds and ballast tanks; and

— location of ballast tanks adjacent to heated fuel oil tanks.

1)
For oil tanker see Ref.2, for bulk carrier see Ref.5, for chemical tankers and double hull oil tankers see Ref.3 and Ref.5, for
double side bulk carrier see Ref.3 and Ref.5
Ref. 3, which contains catalogues of typical damages and proposed repair methods for double hull oil tanker structural details
which may to some extent be similar to structural details in double skin bulk carrier

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The references2) gives definitive examples which can be used for judging and describing coating condition,
using typical pictures of conditions.
Reference3) should be used as the basis for the evaluation of corrosion risk, together with the age of the ship
and relevant information on the anticipated condition of the ship as derived from the information collected
in order to prepare the survey programme.
The various tanks, holds and spaces should be listed with the corrosion risks nominated accordingly.
Special attention is to be given to the areas where the double hull tanker is particularly exposed to corrosion.
To do this end, the specific aspects addressing corrosion in double hull tankers indicated in 3.4 (Corrosion
trends) of Ref.3 are to be taken into account.

3.2.3 Locations for close-up survey and thickness measurement

On the basis of the table of corrosion risks and the evaluation of design experience, the locations for initial
close-up survey and thickness measurement (sections) may be nominated.
The sections subject to thickness measurement should normally be nominated in tanks, holds and spaces
where corrosion risk is judged to be the highest.
The nomination of tanks, holds and spaces for close-up survey should, initially, be based on highest
corrosion risk, and should always include ballast tanks. The principle for the selection should be that the
extent is increased by age or where information is insufficient or unreliable.

2)
For oil tanker and bulk carrier see Ref.2, for chemical tanker, double hull oil tanker and double side bulk carrier see Ref.4
3)
For oil tanker see Ref.2, for bulk carrier see Ref.5, for chemical tanker and double hull oil tanker see Ref.4, for double side
bulk carrier see Ref.4 and Ref.5

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Figure B.4.1 Technical assessment and the survey planning process

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Figure B.4.2 Typical locations susceptible to structural damage or corrosion in bulk carriers

Figure B.4.3 Typical damage and repair example (reproduced from reference 5)

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Figure B.4.4 Typical damage and repair example (reproduced from reference 1)

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B.5 Requirements for Extent of Thickness Measurement at Areas of

Substantial Corrosion
1. Oil Tankers within the cargo area length
1.1 Bottom structure

Structural member Extent of measurement Pattern of measurement

Minimum of three bays across tank,
including aft bay. Five-point pattern for each panel between
1. Bottom plating
Measurements around and under all longitudinals and webs
bell mouths
Minimum of three longitudinals in
Three measurements in line across flange
2. Bottom longitudinals each bay where bottom plating
and three measurements on vertical web
Measured
Vertical line of single measurements on web
plating with one measurement between
3. Bottom girders and At fore and aft transverse bulkhead each panel stiffener, or a minimum of three
brackets bracket toes and in centre of tanks measurements. Two measurements across
face flat. Five-point pattern on
girder/bulkhead brackets
Three webs in bays where bottom
4. Bottom transverse plating measured, with Five-point pattern over 2 m2 area. Single
webs measurements at both ends and measurements on face flat.
middle
5. Panel stiffening Where fitted Single measurements

1.2 Deck structure

Structural member Extent of measurement Pattern of measurement

Minimum of three measurements per plate
1. Deck plating Two bands across tank
per band
Three measurements in line vertically on
Minimum of three longitudinals in
2. Deck longitudinals webs, and two measurements on flange (if
each of two bays
fitted)
Vertical line of single measurements on web
plating with one measurement between
3. Deck girders and At fore and aft transverse bulkhead, each panel stiffener, or a minimum of three
brackets bracket toes and in centre of tanks measurements. Two measurements across
face flat. Five-point pattern on
girder/bulkhead brackets
Minimum of two webs with
Five-point pattern over about 2 m2 area.
4. Deck transverse webs measurements at middle and both
Single measurements on face flat
ends of span
5. Panel stiffening Where available Single measurements

1.3 Shell and longitudinal bulkheads

Structural member Extent of measurement Pattern of measurement

1. Deckhead and bottom
Plating between each pair of
strakes, and strakes in
longitudinals in a minimum of three Single measurement
way of stringer
bays
platforms
Plating between every third pair of
2. All other strakes Single measurement
longitudinals in same three bays

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
3. Longitudinals
Three measurements across web and one
– deckhead and bottom Each longitudinal in same three bays
measurement on flange
strakes
4. Longitudinals Every third longitudinal in same three Three measurements across web and one
– all others bays measurement on flange
5. Longitudinals Minimum of three at top, middle and
Five-point pattern over area of bracket
– bracket bottom of tank in same three bays
Three webs with minimum of three Five-point pattern over about 2 m2 area, plus
6. Web frames and cross locations on each web, including in single measurements on web frame and
ties way of cross tie connections cross tie face flats

1.4 Transverse bulkheads and swash bulkheads

Structural member Extent of measurement Pattern of measurement

Plating between pair of stiffeners at
1. Deckhead and bottom
three locations approximately Five-point pattern between stiffeners over
strakes, and strakes in
quarter, half and three-quarters 1 m length
way of stringer platforms
width of tank
Plating between pair of stiffeners at
2. All other strakes Single measurement
middle location
Plating for each change of scantling
3. Strakes in corrugated
at centre of panel and at flange or Five-point pattern over about 1 m2 of plating
bulkheads
fabricated connection
For web, five-point pattern over span
between bracket connections (two
measurements across web at each bracket
4. Stiffeners Minimum of three typical stiffeners
connection, and one at centre of span). For
flange, single measurements at each bracket
toe and at centre of span
Minimum of three at top, middle and
5. Brackets Five-point pattern over area of bracket
bottom of tank
Measurements at toe of bracket and For web, five-point pattern over about 1 m2
6. Deep webs and girders
centre of span area. Three measurements across face flat
Five-point pattern over 1 m2 area plus single
All stringers with measurements at
7. Stringer platforms measurements near bracket toes and on
both ends and middle
face flats

2. Double-hull Oil Tankers within the cargo area length

2.1 Bottom, inner bottom and hopper structure

Structural member Extent of measurement Pattern of measurement

Minimum of three bays across
double-bottom tank, including aft
Bottom, inner bottom and Five-point pattern for each panel between
bay
hopper structure plating longitudinals and floors
Measurements around and under all
suction bell mouths
Bottom, inner bottom and Minimum of three longitudinals in
Three measurements in line across flange
hopper structure each bay where bottom plating
and three measurements on vertical web
longitudinals measured
Vertical line of single measurements on
Bottom girders, including At fore and aft watertight floors and girder plating with one measurement
the watertight ones in centre of tanks between each panel stiffener, or a
minimum of three measurements

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
Three floors in bays where bottom
Bottom floors, including plating measured, with
Five-point pattern over 2 m2 area
the watertight ones measurements at both ends and
middle
Hopper structure web Three floors in bays where bottom Five-point pattern over 1 m2 of plating.
frame ring plating measured Single measurements on flange
Hopper structure - lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
transverse - upper ⅔ of bulkhead Five-point pattern over 2 m2 of plating
watertight bulkhead or For web, five-point pattern over span (two
swash bulkhead measurements across web at each end and
- stiffeners (minimum of three) one at centre of span). For flange, single
measurements at each end and centre of
span
Panel stiffening Where applicable Single measurements

2.2 Deck structure

Structural member Extent of measurement Pattern of measurement

Minimum of three measurements per plate
Deck plating Two transverse bands across tank
per band
Every third longitudinal in each of Three measurements in line vertically on
Deck longitudinals two bands with a minimum of one webs and two measurements on flange (if
longitudinal fitted)
Vertical line of single measurements on web
plating with one measurement between
Deck girders and brackets At fore and aft transverse bulkhead, each panel stiffener, or a minimum of three
(usually in cargo tanks only) bracket toes and in centre of tanks measurements. Two measurements across
flange. Five-point pattern on
girder/bulkhead brackets
Minimum of two webs, with
Five-point pattern over 1 m2 area. Single
Deck transverse webs measurements at both ends and
measurements on flange
middle of span
Vertical web and transverse
Minimum of two webs, and both
bulkhead in wing ballast Five-point pattern over 1 m2 area
transverse bulkheads
tank (2 m from deck)
Panel stiffening Where applicable Single measurements

2.3 Structure in wing ballast tanks

Structural member Extent of measurement Pattern of measurement

Side shell and longitudinal
bulkhead plating:
- upper strake and strakes - Plating between each pair of
in way of horizontal longitudinals in a minimum of - Single measurement
girders three bays (along the tank)
- Plating between every third pair of
- all other strakes - Single measurement
longitudinals in same three bays
Side shell and longitudinal
bulkhead longitudinals on:
- Each longitudinal in same three - Three measurements across web and one
- upper strake
bays measurement on flange
- Each third longitudinal in same - Three measurements across web and one
- all other strakes
three bays measurement on flange

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
Minimum of three at top, middle and
Longitudinals - brackets Five-point pattern over area of bracket
bottom of tank in same three bays
Vertical web and transverse
bulkheads (excluding
deckhead area):
- strakes in way of - Minimum of two webs and both - Five-point pattern over approximately
horizontal girders transverse bulkheads 2 m2 area
- Minimum of two webs and both - Two measurements between each pair of
- other strakes
transverse bulkheads vertical stiffeners
Plating on each girder in a minimum Two measurements between each pair of
Horizontal girders
of three bays longitudinal girder stiffeners
Panel stiffening Where applicable Single measurements

2.4 Longitudinal bulkheads in cargo tanks

Structural member Extent of measurement Pattern of measurement

Deckhead and bottom
Plating between each pair of
strakes, and strakes in way
longitudinals in a minimum of three Single measurement
of the horizontal stringers of
bays
transverse bulkheads
Plating between every third pair of
All other strakes Single measurement
longitudinals in same three bays
Longitudinals on deckhead Three measurements across web and one
Each longitudinal in same three bays
and bottom strakes measurement on flange
Every third longitudinal in same three Three measurements across web and one
All other longitudinals
bays measurement on flange
Minimum of three at top, middle and
Longitudinals brackets Five-point pattern over area of bracket
bottom of tank in same three bays
Three webs with minimum of three Five-point pattern over approximately 2 m2
Web frames and cross ties locations on each web, including in area of webs, plus single measurements on
way of cross tie connections flanges of web frame and cross ties
Five-point pattern over approximately 2 m2
Lower end brackets
Minimum of three brackets area of brackets, plus single measurements
(opposite side of web frame)
on bracket flanges

2.5 Transverse watertight and swash bulkheads in cargo tanks

Structural member Extent of measurement Pattern of measurement

- Transverse band within 25 mm of
Upper and lower stool, Five-point pattern between stiffeners over
welded connection to inner
where fitted 1 m length
bottom/deck plating
- Transverse band within 25 mm of
welded connection to shelf plate
Deckhead and bottom Plating between pair of stiffeners at
Five-point pattern between stiffeners over
strakes, and strakes in way three locations: approximately ¼, ½
1 m length
of horizontal stringers and ¾ width of tank
Plating between pair of stiffeners at
All other strakes Single measurement
middle location
Plating for each change of scantling at
Strakes in corrugated Five-point pattern over approximately 1 m2
centre of panel and at flange of
bulkheads of plating
fabricated connection

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
For web, five-point pattern over span
between bracket connections (two
measurements across web at each bracket
Stiffeners Minimum of three typical stiffeners
connection and one at centre of span)
For flange, single measurements at each
bracket toe and at centre of span
Minimum of three at top, middle and
Brackets Five-point pattern over area of bracket
bottom of tank
Five-point pattern over 1 m2 area, plus
All stringers with measurements at
Horizontal stringers single measurements near bracket toes and
both ends and middle
on flanges

3. Bulk Carriers within the cargo area

3.1 Shell plating

Structural member Extent of measurement Pattern of measurement

1. Bottom and side shell a. Suspect plate, plus four adjacent a. Five-point pattern for each panel
plating plates between longitudinals
b. See other tables for particulars on
gauging in way of tanks and cargo
holds
2. Bottom/side shell Minimum of three longitudinals in Three measurements in line across web
longitudinals way of suspect areas Three measurements on flange

3.2 Transverse bulkheads in cargo holds

Structural member Extent of measurement Pattern of measurement

a. Transverse band within 25 mm of a. Five-point pattern between stiffeners over
1. Lower stool
welded connection to inner bottom 1 m length
b. Transverse band within 25 mm of
b. Ditto
welded connection to shelf plate
a. Transverse band at approximately
2. Transverse bulkhead a. Five-point pattern over 1 m2 of plating
mid-height
b. Transverse band at part of
bulkhead adjacent to upper deck or
b. Five-point pattern over 1 m2 of plating
below upper stool shelf plate (for
those ships fitted with upper stools)

3.3 Deck structure including cross strips, main cargo hatchways, hatch covers, coamings and topside
tanks

Structural member Extent of measurement Pattern of measurement

Five-point pattern between under deck
1. Cross-deck strip plating Suspect cross-deck strip plating
stiffeners over 1 m length
a. Five-point pattern at each end and
2. Under-deck stiffeners a. Transverse member
mid-span
b. Longitudinal member b. Five-point pattern on both web and flange
a. Side and end skirts, each three
3. Hatch covers a. Five-point pattern at each location
locations
b. Three longitudinal bands, outboard
b. Five-point measurement each band
strakes (2) and centreline strake (1)

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
Each side and end of coaming, one
Five-point measurement. Each. band, i.e.
4. Hatch coamings band lower third, one band upper
end or side coaming
two-thirds of coaming
5. Topside water ballast
a. Watertight transverse bulkheads
tanks
i. lower third of bulkhead i. five-point pattern over 1 m2 of plating
ii. upper two-thirds of bulkhead ii. five-point pattern over 1 m2 of plating
iii. stiffeners iii. five-point pattern over 1 m length
b. Two representative swash
transverse bulkheads
i. lower third of bulkhead i. five-point pattern over 1 m2 of plating
ii. upper two-thirds of bulkhead ii. five-point pattern over 1 m2 of plating
iii. stiffeners iii. five-point pattern over 1 m length
c. Three representative bays of slope
plating
i. lower third of tank i. five-point pattern over 1 m2 of plating
ii. upper two-thirds of tank ii. five-point pattern over 1 m2 of plating
d. five-point pattern both web and flange
d. Longitudinals, suspect and
over 1 m length
adjacent
6. Main deck plating Suspect plates and adjacent (4) Five-point pattern over 1 m2 of plating
7. Main deck Minimum of three longitudinals Five-point pattern on both web and flange
longitudinals where plating measured over 1 m length
8. Web
Suspect plates Five-point pattern over 1 m2
frames/transverses

3.4 Double-bottom and hopper structure

Structural member Extent of measurement Pattern of measurement

1. Inner/double-bottom Five-point pattern for each panel between
Suspect plate plus all adjacent plates
plating longitudinals over 1 m length
2. Inner/double-bottom Three longitudinals where plates Three measurements in line across web, and
longitudinals measured three measurements on flange
3. Longitudinal girders or
Suspect plates Five-point pattern over about 1 m2
transverse floors
4. Watertight bulkheads
a. Lower third of tank a. Five-point pattern over 1 m2 of plating
(WT floors)
b. Five-point pattern alternate plates over
b. Upper two thirds of tank
1 m2 of plating
5. Web frames Suspect plate Five-point pattern over 1 m2 of plating
6. Bottom/side shell Minimum of three longitudinals in Three measurements in line across web, and
longitudinals way of suspect areas three measurements on flange

3.5 Cargo holds

Structural member Extent of measurement Pattern of measurement

a. at each end and mid span:
Side shell frames Suspect frame and each adjacent
five-point pattern of both web and flange
b. Five-point pattern within 25 mm of
welded attachment to both shell and
lower slope plate

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

4. Double skin Bulk Carriers within the cargo area

4.1 Bottom, inner bottom and hopper structure

Structural member Extent of measurement Pattern of measurement

Bottom, inner bottom and Minimum of three bays across Five-point pattern for each panel between
hopper structure plating double-bottom tank, including aft bay longitudinals and floors
Measurements around and under all
suction bell mouths
Bottom, inner bottom and Minimum of three longitudinals in Three measurements in line across flange
hopper structure each bay where bottom plating and three measurements on the vertical
longitudinals measured web
Vertical line of single measurements on
Bottom girders,
At fore and aft watertight floors and girder plating with one measurement
including the watertight
in centre of tanks between each panel stiffener, or a minimum
ones
of three measurements
Three floors in the bays where
Bottom floors, including bottom plating measured, with Five-point pattern over 2 m
the watertight ones measurements at both ends and 2 area
middle
Hopper structure web Three floors in bays where bottom Five-point pattern over 1 m2 of plating
frame ring plating measured Single measurements on flange
Hopper structure – lower ⅓ of bulkhead - five-point pattern over 1 m2 of plating
transverse – upper ⅔ of bulkhead - five-point pattern over 2 m2 of plating
watertight bulkhead or - For web, five-point pattern over span
swash bulkhead (two measurements across web at each
– stiffeners (minimum of three) end and one at centre of span). For
flange, single measurements at each end
and centre of span
Panel stiffening Where applicable Single measurements

4.2 Deck structure including cross strips, main cargo hatchways, hatch covers, coamings and topside
tanks

Structural member Extent of measurement Pattern of measurement

Five-point pattern between under deck
Cross deck strip plating Suspect cross deck strip plating
stiffeners over 1 m length
Under deck stiffeners Transverse members Five-point pattern at each end and mid span
Longitudinal member Five-point pattern on both web and flange
Side and end skirts, each three
Hatch covers Five-point pattern at each location
locations
Three longitudinal bands, outboard
Five-point measurement each band
strakes (2) and centreline strake (1)
Each side and end of coaming, one
Five-point measurement each band, i.e. end
Hatch coamings band lower ⅓, one band upper ⅔ of
or side coaming
coaming
Topside ballast tanks a) watertight transverse bulkheads:
– Lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
– Upper ⅔ of bulkhead Five-point pattern over 1 m2 of plating
– Stiffeners Five-point pattern over 1 m length
b) two representative swash
transverse bulkheads:
– Lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
– Upper ⅔ of bulkhead Five-point pattern over 1 m2 of plating
– Stiffeners Five-point pattern over 1 m length
c) three representative bays of slope
plating:

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

Continued from previous table

Structural member Extent of measurement Pattern of measurement
– Lower ⅓ of tank Five-point pattern over 1 m2 of plating
– Upper ⅔ of tank Five-point pattern over 1 m2 of plating
d) Longitudinals, suspect and Five-point pattern on both web and flange
adjacent over 1 m length
Main deck plating Suspect plates and adjacent (4) Five-point pattern over 1 m2 of plating
Five-point pattern on both web and flange
Main deck longitudinals Suspect plates
over 1 m length
Web frames/ Transverses Suspect plates Five-point pattern over 1 m2 of plating

4.3 Structure in double-side spaces of double-side skin bulk carriers including wing void spaces of ore
carriers

Structural member Extent of measurement Pattern of measurement

Side shell and inner
plating:
- Plating between each pair of
- Upper strake and strakes
transverse frames/longitudinals in
in way of horizontal - Single measurement
a minimum of three bays (along
girders
the tank)
- Plating between every third pair of
- All other strakes - Single measurement
longitudinals in same three bays
Side shell and inner
side transverse frames/
longitudinals on:
- Each transverse frame/longitudinal - Three measurements across web and one
- upper strake
in same three bays measurement on flange
- Each third transverse
- Three measurements across web and one
- all other strakes frame/longitudinal in same three
measurement on flange
bays
Transverse frames/ Minimum of three at top, middle and
Five-point pattern over area of bracket
longitudinals: – brackets bottom of tank in same three bays
Vertical web and
transverse bulkheads:
– strakes in a way of – Minimum of two webs and – Five-point pattern over approximately
horizontal girders both transverse bulkheads 2 m2 area
– Minimum of two webs and – Two measurements between each pair of
– other strakes
both transverse bulkheads vertical stiffeners
Plating on each girder in a minimum Two measurements between each pair of
Horizontal girders
of three bays longitudinal girder stiffeners
Panel stiffening Where applicable Single measurements

4.4 Transverse bulkheads in cargo holds

Structural member Extent of measurement Pattern of measurement

- Transverse band within 25 mm of - Five-point pattern between stiffeners
Lower stool, where fitted welded connection to inner bottom over 1 m length
- Transverse bands within 25 mm of - Five-point pattern between stiffeners
welded connection to shelf plate over 1 m length
- Transverse band at approximately
Transverse bulkheads mid height - Five-point pattern over 1 m2 of plating
- Transverse band at part of
bulkhead adjacent to upper deck or
below upper stool shelf plate (for - Five-point pattern over 1 m2 of plating
those ships fitted with upper
stools)

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

5. Chemical Tankers within the cargo area

5.1 Bottom, inner bottom and hopper structure

Structural member Extent of measurement Pattern of measurement

Minimum of three bays across
Bottom, inner bottom and Five-point pattern for each panel between
double-bottom tank, including aft
hopper structure plating longitudinals and floors
bay
Measurements around and under all
suction bell mouths
Bottom, inner bottom and Minimum of three longitudinals in
Three measurements in line across flange
hopper structure each bay where bottom plating
and three measurements on vertical web
longitudinals measured
Vertical line of single measurements on
girder plating with one measurement
Bottom girders, including At fore and aft watertight floors and between each panel stiffener, or a
the watertight ones in centre of tanks minimum of three measurements
Two measurements across face flat where
fitted.
Three floors in bays where bottom
Bottom floors, including plating measured, with
Five-point pattern over 2 m2 area
the watertight ones measurements at both ends and
middle
Hopper structure web Three floors in bays where bottom Five-point pattern over 1 m2 of plating.
frame ring plating measured Single measurements on flange
Hopper structuretransverse - lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
watertight bulkhead or - upper ⅔ of bulkhead Five-point pattern over 2 m2 of plating
swash bulkhead For web, five-point pattern over span (two
measurements across web at each end and
- stiffeners (minimum of three) one at centre of span). For flange, single
measurements at each end and centre of
span
Panel stiffening Where applicable Single measurements

5.2 Deck structure

Structural member Extent of measurement Pattern of measurement

Minimum of three measurements per plate
Deck plating Two transverse bands across tank
per band
Every third longitudinal in each of Three measurements in line vertically on
Deck longitudinals two bands with a minimum of one webs and two measurements on flange (if
longitudinal fitted)
Vertical line of single measurements on web
plating with one measurement between
At fore and aft transverse bulkhead, each panel stiffener, or a minimum of three
Deck girders and brackets
bracket toes and in centre of tanks measurements. Two measurements across
flange. Five-point pattern on
girder/bulkhead brackets
Minimum of two webs, with
Five-point pattern over 1 m2 area. Single
Deck transverse webs measurements at both ends and
measurements on flange
middle of span
Vertical web and transverse
bulkhead in wing ballast Minimum of two webs, and both
Five-point pattern over 1 m2 area
tank for double hull transverse bulkheads
design (2 m from deck)
Panel stiffening Where applicable Single measurements

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.5

5.3 Side shell and longitudinal bulkheads

Structural member Extent of measurement Pattern of measurement

Side shell and longitudinal
bulkhead plating:
- Deckhead and bottom - Plating between each pair of
strakes, and strakes in longitudinals in a minimum of - Single measurement
way of horizontal girders three bays (along the tank)
- Plating between every third pair of
- all other strakes - Single measurement
longitudinals in same three bays
Side shell and longitudinal
bulkhead longitudinals on:
- deckhead and bottom - Each longitudinal in same three - Three measurements across web and one
strakes bays measurement on flange
- Each third longitudinal in same - Three measurements across web and one
- all other strakes
three bays measurement on flange
Minimum of three at top, middle and
Longitudinals - brackets Five-point pattern over area of bracket
bottom of tank in same three bays
Vertical web and
transverse
bulkheads (excluding deck
area):
- strakes in way of - Minimum of two webs and both - Five-point pattern over approximately
horizontal girders transverse bulkheads 2 m2 area
- Minimum of two webs and both - Two measurements between each pair of
- other strakes
transverse bulkheads vertical stiffeners
Three webs with minimum of three
Web frames and cross ties Five-point pattern over approximately 2 m2
locations on each web, including in
for other tanks than area of webs, plus single measurements on
way of cross tie connections and
double side tanks flanges of web frame and cross ties
lower end bracket
Plating on each girder in a minimum Two measurements between each pair of
Horizontal girders
of three bays longitudinal girder stiffeners
Panel stiffening Where applicable Single measurements

5.4 Transverse watertight and swash bulkheads in cargo tanks

Structural member Extent of measurement Pattern of measurement

- Transverse band within 25 mm of
Upper and lower stool, Five-point pattern between stiffeners over
welded connection to inner
where fitted 1 m length
bottom/deck plating
- Transverse band within 25 mm of
welded connection to shelf plate
Deckhead and bottom Plating between pair of stiffeners at
Five-point pattern between stiffeners over
strakes, and strakes in way three locations: approximately ¼, ½
1 m length
of horizontal stringers and ¾ width of tank
Plating between pair of stiffeners at
All other strakes Single measurement
middle location
Plating for each change of scantling at
Strakes in corrugated Five-point pattern over approximately 1 m2
centre of panel and at flange of
bulkheads of plating
fabricated connection
For web, five-point pattern over span
between bracket connections (two
measurements across web at each bracket
Stiffeners Minimum of three typical stiffeners
connection and one at centre of span)
For flange, single measurements at each
bracket toe and at centre of span

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.6

Continued from previous table

Structural member Extent of measurement Pattern of measurement
Minimum of three at top, middle and
Brackets Five-point pattern over area of bracket
bottom of tank
Five-point pattern over 1 m2 area, plus
All stringers with measurements at
Horizontal stringers single measurements near bracket toes and
both ends and middle
on flanges
Measurements at toe of bracket and For web, five-point patter over about 1 m2 .
Deep web and girders
at centre of span Three measurements across the face flat

B.6 Guidelines for the Gauging of the Vertically Corrugated Transverse

Watertight Bulkhead Between Holds No. 1 and 2
1. Gauging is necessary to determine the general condition of the structure and to define the extent
of possible repairs and/or reinforcements of the vertically corrugated transverse watertight bulkhead for
verification of the compliance with Rules for Hull (Pt.1, Vol.II) Sec.23.J.
2. Taking into account the buckling model specified in Rules for Hull (Pt.1, Vol.II) Sec.23.J, in the evaluation
of strength of the bulkhead, it is essential to determine the thickness diminution at the critical levels shown
in Fig. B.6.1 and Fig. B.6.2 of this annex.
3. The gauging should be carried out at the levels as described below. To adequately assess the scantlings
of each individual vertical corrugation, each corrugation flange, web, shedder plate and gusset plate within
each of the levels given below should be gauged.
Level (a) Ships without lower stool (see Fig. B.6.1):
Locations:

— The mid-breadth of the corrugation flanges at approximately 200 mm above the line of shedder
plates;

— The middle of gusset plates between corrugation flanges, where fitted;

— The middle of the shedder plates;

— The mid-breadth of the corrugation webs at approximately 200 mm above the line of shedder plates.

Level (b) Ships with lower stool (see Fig. B.6.2):

Locations:

— The mid-breadth of the corrugation flanges at approximately 200 mm above the line of shedder
plates;

— The middle of gusset plates between corrugation flanges, where fitted;

— The middle of the shedder plates;

— The mid-breadth of the corrugation webs at approximately 200 mm above the line of shedder plates.

Level (c) Ships with or without lower stool (see Fig. B.6.1 and Fig. B.6.2):
Locations:

— The mid-breadth of the corrugation flanges and webs at about the mid-height of the corrugation.

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.6

Figure B.6.1 Ships without lower stool

Figure B.6.2 Ships with lower stool

4. Where the thickness changes within the horizontal levels, the thinner plate should be gauged.
5. Renewal/reinforcement shall be done in accordance with the following requirements (see Note 1).
1) Steel renewal is required where the gauged thickness is less than tnet + 0,5 mm, tnet being the
thickness used for the calculation of bending capacity and shear stresses as given in Rules for Hull
(Pt.1, Vol.II) Sec.23.J.4.2. or the local net plate thickness as given in Rules for Hull (Pt.1, Vol.II)
Sec.23.J.4.7. Alternatively, reinforcing doubling strips may be used providing the net thickness is not
dictated by shear strength requirements for web plates (see Rules for Hull (Pt.1, Vol.II) Sec.23.J.4.5
and Rules for Hull (Pt.1, Vol.II) Sec.23.J.4.6.2) or by local pressure requirements for web and flange
plates (see Rules for Hull (Pt.1, Vol.II) Sec.23.J.4.7).

2) Where the gauged thickness is within the range tnet + 0,5 mm and tnet + 1,0 mm, coating (applied in
accordance with the coating manufacturer’s requirements) or annual gauging may be adopted as an
alternative to steel renewal.

Note 1 :
See also Annex UR S19, Rev.5:

Annex 1 : Guidance on Renewal/Reinforcement of Vertically Corrugated Transverse Watertight Bulkhead

Between Cargo Holds Nos. 1 And 2.

Annex 2 : Guidance to Access Capability of Carriage Of High Density Cargoes on Existing Bulk Carriers
According to The Strength of Transvers Bulkhead Between Cargo Holds Nos.1 And 2.

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3) Where steel renewal or reinforcement is required, a minimum thickness of tnet + 2,5 mm is to be

replenished for the renewed or reinforced parts.

4) When:

0,8·(ReH ·tfl ) ≥Reh,2 ·tst

where:

ReH,1 = minimum upper yield stress, in N/mm2 , of the material used for the corrugation flanges
minimum upper yield stress, in N/mm2 , of the material used for the lower stool side
Reh,2 =
plating or floors (if no stool is fitted)
flange thickness, in mm, which is found to be acceptable on the basis of the criteria
specified in a) above or, when steel renewal is required, the replenished thickness
tfl = according to the criteria specified in b) above. The above flange thickness dictated by local
pressure requirements (see Rules for Hull (Pt.1, Vol.II), Sec.23.J.4.7) need not be
considered for this purpose
tst = as built thickness, in mm, of the lower stool side plating or floors (if no stool is fitted)

Gussets with shedder plates, extending from the lower end of corrugations up to 0,1·` or reinforcing
doubling strips (on bulkhead corrugations and stool side plating) are to be fitted.

If gusset plates are fitted, the material of such gusset plates is to be the same as that of the corrugation
flanges. The gusset plates are to be connected to the lower stool shelf plate or inner bottom (if no
lower stool is fitted) by deep penetration welds (see Fig. B.6.3).

5) Where steel renewal is required, the bulkhead connections to the lower stool shelf plate or inner
bottom (if no stool is fitted) are to be at least made by deep penetration welds (see Fig. B.6.3).

6) Where gusset plates are to be fitted or renewed, their connections with the corrugations and the
lower stool shelf plate or inner bottom (if no stool is fitted) are to be at least made by deep penetration
welds (see Fig. B.6.3).

Figure B.6.3 Connection by deep penetration welds

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B.7 Guidelines for the Thickness Measurements of Side Shell Frames and
Brackets in Single-Side Skin Bulk Carriers Required to Comply with URS
31
1. General

Thickness measurements should be conducted to determine the general condition of the structure and to
define the extent of possible steel renewals or other measures for the webs and flanges of side shell frames
and brackets for verification of the compliance with URS 31 (adopted in Annex B.11).

2. Zones of side shell frames and brackets

2.1 For the purpose of steel renewal, sand blasting and coating, four zones A, B, C and D are defined as
shown in Fig. B.7.1.
2.2 Zones A and B should be considered the most critical zones.

Figure B.7.1 Zones of side shell frames and brackets

3. Pitting and grooving

3.1 Pits can grow in a variety of shapes, some of which should be ground before assessment.
3.2 Pitting corrosion may be found under coating blisters, which should be removed before inspection.
3.3 To measure the remaining thickness of pits or grooving the normal ultrasonic transducer (generally 10
mm diameter) will not suffice. A miniature transducer (3 to 5 mm diameter) should be used. Alternatively,
the firm conducting the thickness measurement should use a pit gauge to measure the depth of the pits
and grooving and calculate the remaining thickness.
3.4 Assessment based upon area
This is the method specified in paragraph 2.5 of annex 2 to resolution MSC.168 (79) and is based upon the
intensity determined from Fig.B.7.2 below.

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Figure B.7.2 Pitting intensity diagrams (from 5 to 25 % intensity)

3.5 If pitting intensity is higher than 15 percent in an area (see Fig.B.7.2), then thickness measurements
should be taken to determine the extent of the pitting corrosion. The 15 per cent is based upon pitting or
grooving on only one side of the plate.
3.6 In cases where pitting is evident as defined above (exceeding 15%) then an area of 300 mm diameter
or more (or, where this is impracticable on the frame flange or the side shell, hopper tank plating or topside
tank plating attached to the side frame, an equivalent rectangular area), at the most pitted part, should be
cleaned to bare metal, and the thickness measured in way of the five deepest pits within the cleaned area.
The least thickness measured in way of any of these pits is to be taken as the thickness to be recorded.
3.7 The minimum acceptable remaining thickness in any pit or groove is equal to:
3.7.1 75 per cent of the as built thickness, for pitting or grooving in the cargo hold side frame webs and
flanges.
3.7.2 70 per cent of the as built thickness, for pitting or grooving in the side shell, hopper tank and topside
tank plating attached to the cargo hold side frame, over a width up to 30 mm from each side of it.

4. Thickness measurement methodology

4.1 Numbers of side frames to be measured should be equivalent to those of the class renewal survey or
intermediate survey corresponding to the ship’s age. Representative thickness measurements should be
taken for each zone as specified below.
4.2 Special consideration to the extent of the thickness measurements may be given by the Administration
or organization recognized by the Administration, if the structural members show no thickness diminution
with respect to the as built thicknesses and the coating is found in ”as new” condition (i.e. without
breakdown or rusting).
4.3 Where thickness measurement readings close to the criteria are found, the number of hold frames to
be measured should be increased.
4.4 If renewal or other measures according to resolution MSC.168 (79) should be applied on individual
frames in a hold, then all frames in that hold should have thickness measurements taken.

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4.5 There is a variety of construction methods used for side shell frames in bulk carriers. Some have
faceplates (T sections) on the side shell frames, some have flanged plates and some have bulb plates. The
use of faceplates and flanged sections is considered similar for thickness measurement purposes in that
both the web and faceplate or web and flange plate should be measured. If bulb plate has been used,
then web of the bulb plate should be measured in the normal manner and the sectional modulus should
be specially considered if required.
4.6 Gauging’s for Zones A, B and D (Web plating)
The pattern for thickness measurements in Zones A, B and D should be a five-point pattern. See Fig. B.7.3.
The five-point pattern should be over the depth of the web and the same area vertically. The thickness
measurement report should reflect the average reading.

Figure B.7.3 Typical five-point pattern on the web plate

4.7 Thickness measurements for Zone C (Web plating)

Depending on the condition of the web in way of Zone C, the web may be measured by taking three readings
over the length of Zone C and averaging them. The average reading should be compared with the allowable
thickness. If the web plating has general corrosion then this pattern should be expanded to a five-point
pattern as noted above.
4.8 Thickness measurements for section a) and b) (flanges and side shell plating)
Where the lower bracket length or depth does not meet the requirements in annex 1 to resolution
MSC.168(79), thickness measurements should be taken at sections a) and b) to calculate the actual section
modulus required in paragraph 3.4 of annex 2 to resolution MSC.168(79) (see Fig.B.7.4). At least two
readings on the flange/faceplate should be taken on each side of the frame (i.e. fore and aft) in way of
section a) and section b).

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Annex B Annexes to Section 4-I B.8

Figure B.7.4 Sections a) and b)

B.8 Additional Annual Survey Requirements for the Foremost Cargo Hold of
Ships Subject to Regulation XII/9 of the Convention
1. General

In the case of bulk carriers over five years of age, the annual survey should include, in addition to the
requirements of the annual surveys prescribed in chapter 3 of the ESP Code, an examination of the following
items.

2. Extent of survey
2.1 For bulk carriers of 5 to 15 years of age
2.1.1 An overall survey of the foremost cargo hold, including close-up survey of sufficient extent,
minimum 25 per cent of frames, should be carried out to establish the condition of:
— shell frames including their upper and lower end attachments, adjacent shell plating, and transverse
bulkheads; and
— areas found to be suspect areas at the previous class renewal survey.
2.1.2 Where considered necessary by the surveyor as a result of the overall and close-up survey as
described in 2.1.1 above, the survey should be extended to include a close-up survey of all of the shell
frames and adjacent shell plating of the cargo hold.

2.2 For bulk carriers exceeding 15 years of age

An overall survey of the foremost cargo hold, including close-up survey should be carried out to establish
the condition of:
— all shell frames including their upper and lower end attachments, adjacent shell plating, and
transverse bulkheads; and
— areas found to be suspect areas at the previous class renewal survey.
— Extent of thickness measurement
2.2.1 Thickness measurement should be carried out to an extent sufficient to determine both general and
local corrosion levels at areas subject to close-up survey, as described in 2.1 and 2.2 above. The minimum
requirement for thickness measurements are areas found to be suspect areas at the previous class renewal
survey. Where substantial corrosion is found, the extent of thickness measurements should be increased
with the requirements of Annex B.5.

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2.2.2 The thickness measurement may be dispensed with provided the surveyor is satisfied by the
close-up survey, there is no structural diminution and the protective coating, where applied, remains
effective.

3. Special consideration

Where the protective coating, as referred to in the explanatory note below, in the foremost cargo hold
is found to be in GOOD condition, the extent of close-up surveys and thickness measurements may be
specially considered.
Explanatory note:
For existing bulk carriers, where owners may elect to coat or recoat cargo holds as noted above,
consideration may be given to the extent of the close-up and thickness measurement surveys. Prior to
the coating of cargo holds of existing ships, scantlings should be ascertained in the presence of a surveyor.

B.9 Strength of Cargo Hatch Cover Securing Arrangements for Bulk Carriers
See Rules for Hull (Pt.1, Vol.II) Sec.17.F.

B.10 Criteria for Longitudinal Strength of Hull Girder for Oil Tankers
A. General
1.1 These criteria are to be used for the evaluation of longitudinal strength of the ship’s hull girder as
required by Section 4, I.A.12.1.2.
1.2 In order that ship’s longitudinal strength to be evaluated can be recognized as valid, fillet welding
between longitudinal internal members and hull envelopes are to be in sound condition so as to keep
integrity of longitudinal internal members with hull envelopes.

B. Evaluation of longitudinal strength

On oil tankers of 130 m in length and upwards and of over 10 years of age, the longitudinal strength of the
ship’s hull girder is to be evaluated in compliance with the requirements of this annex on the basis of the
thickness measured, renewed or reinforced, as appropriate, during the special survey.
The condition of the hull girder for longitudinal strength evaluation is to be determined in accordance with
the methods specified in C.
2.1 Calculation of transverse sectional areas of deck and bottom flanges of hull girder
2.1.1 The transverse sectional areas of deck flange (deck plating and deck longitudinals) and bottom flange
(bottom shell plating and bottom longitudinals) of the ship’s hull girder are to be calculated by using the
thickness measured, renewed or reinforced, as appropriate, during the special survey.
2.1.2 If the diminution of sectional areas of either deck or bottom flange exceeds 10% of their respective
as-built area (i.e. original sectional area when the ship was built), either one of the following measures is
to be taken:
1) to renew or reinforce the deck or bottom flanges so that the actual sectional area is not less than
90% of the as-built area; or

2) to calculate the actual section moduli (Wact ) of transverse section of the ship’s hull girder by applying
the calculation method specified in Rules for Hull (Pt.1, Vol.II) Sec.5.C.4, by using the thickness
measured, renewed or reinforced, as appropriate, during the special survey.
2.2 Requirements for transverse section modulus of hull girder

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2.2.1 The actual section moduli of transverse section of the ship’s hull girder calculated in accordance
with the foregoing 2.1.2.2) is not to be less than the requirements given in Annex A.3.

C. Sampling method of thickness measurements for longitudinal strength evaluation and

repair methods
1. Extent of longitudinal strength evaluation

Longitudinal strength should be evaluated within 0,4L amidships for the extent of the hull girder length
that contains tanks therein and within 0,5L amidships for adjacent tanks which may extend beyond 0,4L
amidships, where tanks means ballast tanks and cargo tanks.

2. Sampling method of thickness measurement

2.1 Pursuant to the requirements of Section 4-I, B.4.5 or Section 4-I, C.4.5 for Oil Tanker and Double Hull
Oil Tankers subsequently, transverse sections should be chosen such that thickness measurements can be
taken for as many different tanks in corrosive environments as possible, e.g. ballast tanks sharing a common
plane boundary with cargo tanks fitted with heating coils, other ballast tanks, cargo tanks permitted to be
filled with sea water and other cargo tanks. Ballast tanks sharing a common plane boundary with cargo
tanks fitted with heating coils and cargo tanks permitted to be filled with sea water should be selected
where present.
2.2 The minimum number of transverse sections to be sampled should be in accordance with Table 4-I.2
or Table 4-I.5 for Oil Tanker and Double Hull Oil Tankers subsequently. The transverse sections should be
located where the largest thickness reductions are suspected to occur or are revealed from deck and bottom
plating measurements prescribed in 2.3 and should be clear of areas which have been locally renewed or
reinforced.
2.3 At least two points should be measured on each deck plate and/or bottom shell plate required to be
measured within the cargo area in accordance with the requirements of Table 4-I.2 or Table 4-I.5 for Oil
Tanker and Double Hull Oil Tankers subsequently.
2.4 Within 0,1H (where H is the ship’s moulded depth) of the deck and bottom at each transverse section
to be measured in accordance with the requirements of Table 4-I.2 or Table 4-I.5 for Oil Tanker and Double
Hull Oil Tankers subsequently, every longitudinal and girder should be measured on the web and face plate,
and every plate should be measured at one point between longitudinals.
2.5 For longitudinal members other than those specified in 2.4 to be measured at each transverse section
in accordance with the requirements of Table 4-I.2 or Table 4-I.5 for Oil Tanker and Double Hull Oil Tankers
subsequently, every longitudinal and girder should be measured on the web and face plate, and every plate
should be measured at least in one point per strake.
2.6 The thickness of each component should be determined by averaging all of the measurements taken
in way of the transverse section on each component.

3. Additional measurements where the longitudinal strength is deficient

3.1 Where one or more of the transverse sections are found to be deficient in respect of the longitudinal
strength requirements given in this annex, the number of transverse sections for thickness measurement
should be increased such that each tank within the 0,5L amidships region has been sampled. Tank spaces
that are partially within, but extend beyond, the 0,5L region, should be sampled.
3.2 Additional thickness measurements should also be performed on one transverse section forward and
one aft of each repaired area to the extent necessary to ensure that the areas bordering the repaired section
also comply with the requirements of Section 4-I for Oil Tanker or Double Hull Oil Tankers as applicable.

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4. Effective repair methods

4.1 The extent of renewal or reinforcement carried out to comply with this annex should be in accordance
with 4.2.
4.2 The minimum continuous length of a renewed or reinforced structural member should be not less
than twice the spacing of the primary members in way. In addition, the thickness diminution in way of the
butt joint of each joining member forward and aft of the replaced member (plates, stiffeners, girder webs
and flanges, etc.) should not be within the substantial corrosion range (75% of the allowable diminution
associated with each particular member). Where differences in thickness at the butt joint exceed 15% of
the lower thickness, a transition taper should be provided.
4.3 Alternative repair methods involving the fitting of straps or structural member modification should
be subject to special consideration. In considering the fitting of straps, it should be limited to the following
conditions:

1) to restore and/or increase longitudinal strength;

2) the thickness diminution of the deck or bottom plating to be reinforced should not be within the
substantial corrosion range (75% of the allowable diminution associated with the deck plating);

3) the alignment and arrangement, including the termination of the straps, is in accordance with a
standard recognized by BKI;

4) the straps are continuous over the entire 0,5L amidships length; and

5) continuous fillet welding and full penetration welds are used at butt welding and, depending on the
width of the strap, slot welds. The welding procedures applied should be acceptable to the BKI.

4.4 The existing structure adjacent to replacement areas and in conjunction with the fitted straps, etc.
should be capable of withstanding the applied loads, taking into account the buckling resistance and the
condition of welds between the longitudinal members and hull envelope plating.

B.11 Renewal Criteria for Side Shell Frames and Brackets in Single Side Skin
Bulk Carriers and Single Side Skin OBO Carriers not Built in accordance
with UR S12 Rev.1 or subsequent revisions (UR S31)
1. Application and definitions

These requirements apply to the side shell frames and brackets of cargo holds bounded by the single side
shell of bulk carriers constructed with single deck, topside tanks and hopper tanks in cargo spaces intended
primarily to carry dry cargo in bulk, which were not built in accordance with UR S12 Rev. 1 or subsequent
revisions.
In addition, these requirements also apply to the side shell frames and brackets of cargo holds bounded
by the single side shell of Oil/Bulk/Ore (OBO) carriers, as defined in Annex A.7 but of single side skin
construction.
In the case a vessel as defined above does not satisfy above definition in one or more holds, the
requirements in this sub section do not apply to these individual holds.
For the purpose of this sub section, “ships” means both “bulk carriers” and “OBO carriers” as defined above,
unless otherwise specified.
Bulk Carriers and OBO carriers subject to these requirements are to be assessed for compliance with the
requirements of this sub section and steel renewal, reinforcement or coating, where required in accordance
with this sub section, is to be carried out in accordance with Section 4, I.E.1.2.3.

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These requirements define steel renewal criteria or other measures to be taken for the webs and flanges
of side shell frames and brackets as per 2.
Reinforcing measures of side frames are also defined as per 2.3.
Finite element or other numerical analysis or direct calculation procedures cannot be used as an alternative
to compliance with the requirements of this sub section, except in cases of unusual side structure
arrangements or framing to which the requirements of this sub section cannot be directly applied. In such
cases, the analysis criteria and the strength check criteria are to be in accordance with BKI Rules.

1.1 Ice strengthened ships

1.1.1 Where ships are reinforced to comply with an ice class notation, the intermediate frames are not to
be included when considering compliance with this sub section.
1.1.2 The renewal thicknesses for the additional structure required to meet the ice strengthening notation
are to be based on the BKI requirements.
1.1.3 If the ice class notation is requested to be withdrawn, the additional ice strengthening structure,
with the exception of tripping brackets (see 2.1.2.1.b and 2.3), is not to be considered to contribute to
compliance with this sub section.

2. Renewal or other measures

2.1 Criteria for renewal or other measures
2.1.1 Symbols

tM = thickness as measured [mm]

tREN = thickness at which renewal is required, See 2.1.2
tREN d/t = thickness criteria based on d/t ratio, See 2.1.2.1
tREN S = thickness criteria based on strength, See 2.1.2.2
tCOAT = 0,75 ·tw
tw = thickness in mm as required by Rules for Hull (Pt.1, Vol. II) Sec.23.B.5.2
tAB = thickness as built [mm]
tC = See Table B.11.1 below

Table B.11.1 tC values, in mm

Ship’s length L, Holds other than No. 1 Hold No. 1 Ship’s

in m Span and upper Span and upper
Lower brackets Lower brackets
brackets brackets
≤ 100 2,0 2,5 2,0 3,0
150 2,0 3,0 3,0 3,5
≥ 200 2,0 3,0 3,0 4,0
Note: For intermediate ship lengths, tc is obtained by linear interpolation between the above values.

2.1.2 Criteria for webs (Shear and other checks)

The webs of side shell frames and brackets are to be renewed when the measured thickness (tM ) is equal
to or less than the thickness (tREN ) as defined below:
tREN is the greatest of:

— tCOAT - tC

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— 0,75 tAB
— tREN,d/t (applicable to Zone A and B only), see Fig.B.11.1
— tREN,S (where required by 2.1.2.2)

Figure B.11.1 Lower part and zones of side frames

.1 Thickness criteria based on d/t ratio

Subject to b) and c) below, tREN,d/t is given by the following equation:
tREN,d/t = (web depth in mm)/R
where:
R = for frames:
65 k0,5 for symmetrically flanged frames
55 k0,5 for asymmetrically flanged frames
for lower brackets (see a) below):
87 k0,5 for symmetrically flanged frames
73 k 0,5 for asymmetrically flanged frames
for ordinary hull structural steel and according to Table B.11.1 for higher
k = 1,0
tensile steel

In no instance is tREN,d/t for lower integral brackets to be taken as less than tREN,d/t for the frames they
support.
a) Lower brackets

Lower brackets are to be flanged or face plate is to be fitted, ref. 2.1.3.

In calculating the web depth of the lower brackets, the following will apply:
— The web depth of lower bracket may be measured from the intersection of the sloped bulkhead
of the hopper tank and the side shell plate, perpendicularly to the face plate of the lower bracket
(see Fig. B.11.2).
— Where stiffeners are fitted on the lower bracket plate, the web depth may be taken as the
distance between the side shell and the stiffener, between the stiffeners or between the
outermost stiffener and the face plate of the brackets, whichever is the greatest.

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Figure B.11.2 Connecting bracket in the hopper tank

b) Tripping bracket alternative

When tM is less than tREN,d/t at section b of the side frames, tripping brackets in accordance with
2.3 may be fitted as an alternative to the requirements for the web depth to thickness ratio of side
frames, in which case tREN,d/t may be disregarded in the determination of tREN in accordance with
2.1.2. The value of tM is to be based on zone B according to Annex B.7, see Fig. B.11.1.

c) Immediately abaft collision bulkhead

For the side frames, including the lower bracket, located immediately abaft the collision bulkheads,
whose scantlings are increased in order that their moment of inertia is such to avoid undesirable
flexibility of the side shell, when their web as built thickness tAB is greater than 1,65 · tREN,S , the
thickness tREN,d/t may be taken as the value t’REN,d/t obtained from the following equation:
q
0
tREN,d/t = 3 t2REN,d/t tREN,S

where tREN,S is obtained from 3.3

.2 Thickness criteria based on shear strength check

Where t M in the lower part of side frames, as defined in Fig. B.11.1, is equal to or less than tCOAT , tREN,S is
to be determined in accordance with 3.3.
.3 Thickness of renewed webs of frames and lower brackets
Where steel renewal is required, the renewed webs are to be of a thickness not less than tAB , 1,2 · tCOAT
or 1,2 · tREN , whichever is the greatest.
.4 Criteria for other measures
When tREN < tM ≤ tCOAT , measures are to be taken, consisting of all the following:

a) Sand blasting, or equivalent, and coating (see 2.2).

b) Fitting tripping brackets (see 2.3), when the above condition occurs for any of the side frame zones
A, B, C and D, shown in Fig. B.11.1. Tripping brackets not connected to flanges are to have soft toe,
and the distance between the bracket toe and the frame flange is not to be greater than about 50
mm, see Fig. B.11.3.

c) Maintaining the coating in ”as-new” condition (i.e. without breakdown or rusting) at Class Renewal
Survey and Intermediate Surveys.

The above measures may be waived if the structural members show no thickness diminution with respect
to the as built thicknesses and coating is in ”as-new” condition (i.e. without breakdown or rusting).

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When the measured frame webs thickness tM is such that tREN < tM ≤ tCOAT and the coating is in GOOD
condition, sand blasting and coating as required in a) above may be waived even if not found in “as-new”
condition, as defined above, provided that tripping brackets are fitted and the coating damaged in way of
the tripping bracket welding is repaired.

Figure B.11.3 Tripping Bracket

2.1.3 Criteria for frames and brackets (Bending check)

When lower end brackets were not fitted with flanges at the design stage, flanges are to be fitted so as to
meet the bending strength requirements in 3.4. The full width of the bracket flange is to extend up beyond
the point at which the frame flange reaches full width. Adequate back-up structure in the hopper is to be
ensured, and the bracket is to be aligned with the back-up structure.
Where the length or depth of the lower bracket does not meet the requirements in Rules for Hull (Pt.1,
Vol. II) Sec.23.B.5.2 a bending strength check in accordance with 3.4 is to be carried out and renewals or
reinforcements of frames and/or brackets effected as required therein.
The bending check needs not to be carried out in the case the bracket geometry is modified so as to comply
with Rules for Hull (Pt.1, Vol. II) Sec.23.B.5.2 requirements.

2.2 Thickness measurements, steel renewal, sand blasting and coating

For the purpose of steel renewal, sand blasting and coating, four zones A, B, C and D are defined, as shown in
Fig.B.11.1. When renewal is to be carried out, surface preparation and coating are required for the renewed
structures as given in Rules for Hull (Pt.1, Vol. II) Sec.38.G for cargo holds of new buildings.
Representative thickness measurements are to be taken for each zone and are to be assessed against the
criteria in 2.1.

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When zone B is made up of different plate thicknesses, the lesser thickness is to be used for the application
of the requirements in this sub section.
In case of integral brackets, when the criteria in 2.1 are not satisfied for zone A or B, steel renewal, sand
blasting and coating, as applicable, are to be done for both zones A and B.
In case of separate brackets, when the criteria in 2.1 are not satisfied for zone A or B, steel renewal, sand
blasting and coating is to be done for each one of these zones, as applicable.
When steel renewal is required for zone C according to 2.1, it is to be done for both zones B and C. When
sand blasting and coating is required for zone C according to 2.1, it is to be done for zones B, C and D.
When steel renewal is required for zone D according to 2.1, it needs only to be done for this zone. When
sand blasting and coating is required for zone D according to 2.1, it is to be done for both zones C and D.
Special consideration may be given by BKI to zones previously renewed or re-coated, if found in “as-new”
condition (i.e., without breakdown or rusting).
When adopted, on the basis of the renewal thickness criteria in 2.1, in general coating is to be applied in
compliance with the requirements of Rules for Hull (Pt.1, Vol. II) Sec.38.G, as applicable.
Where, according to the requirements in 2.1, a limited number of side frames and brackets are shown to
require coating over part of their length, the following criteria apply.

a) The part to be coated includes:

— the web and the face plate of the side frames and brackets,
— the hold surface of side shell, hopper tank and topside tank plating, as applicable, over a width
not less than 100 mm from the web of the side frame.

b) Epoxy coating or equivalent is to be applied.

In all cases, all the surfaces to be coated are to be sand blasted prior to coating application.
When flanges of frames or brackets are to be renewed according to this sub section, the outstanding
breadth to thickness ratio is to comply with the requirements in Rules for Hull (Pt.1, Vol.II) Sec.23.B.5.2.

2.3 Reinforcing measures

Reinforcing measures are constituted by tripping brackets, located at the lower part and at midspan of side
frames (see Fig. B.11.3). Tripping brackets may be located at every two frames, but lower and midspan
brackets are to be fitted in line between alternate pairs of frames.
The thickness of the tripping brackets is to be not less than the as-built thickness of the side frame webs to
which they are connected.
Double continuous welding is to be adopted for the connections of tripping brackets to the side shell frames
and shell plating.
Where side frames and side shell are made of Higher Strength Steel, Normal Strength Steel tripping brackets
may be accepted, provided the electrodes used for welding are those required for the particular Higher
Strength Steel grade, and the thickness of the tripping brackets is equal to the frame web thickness,
regardless of the frame web material.

2.4 Weld throat thickness

In case of steel renewal the welded connections are to comply with Rules for Hull (Pt.1, Vol. II) Sec.23.
B.5.4.

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.11

2.5 Pitting and grooving

Criteria for pitting and grooving see Annex B.7.3.

2.6 Renewal of all frames in one or more cargo holds

When all frames in one or more holds are required to be renewed according to this sub section, the
compliance with the requirements in Rules for Hull (Pt.1, Vol. II) Sec.23.B.5 may be accepted in lieu of
the compliance with the requirements in this sub section, provided that:

— It is applied at least to all the frames of the hold(s)

— The coating requirements for side frames of “new ships” are complied with

— The section modulus of side frames is calculated according to BKI Rules.

2.7 Renewal of damaged frames

In case of renewal of a damaged frame already complying with this sub section, the following requirements
apply:

— The conditions accepted in compliance with this sub section are to be restored as a minimum.

— For localised damages, the extension of the renewal is to be carried out according to the standard
practice of BKI.

3. Strength check criteria

In general, loads are to be calculated and strength checks are to be carried out for the aft, middle and
forward frames of each hold. The scantlings required for frames in intermediate positions are to be obtained
by linear interpolation between the results obtained for the above frames.
When scantlings of side frames vary within a hold, the required scantlings are also to be calculated for
the mid frame of each group of frames having the same scantlings. The scantlings required for frames
in intermediate positions are to be obtained by linear interpolation between the results obtained for the
calculated frames.

3.1 Load model

The following loading conditions are to be considered:

— Homogeneous heavy cargo (density greater than 1,78 t/m3 )

— Homogeneous light cargo (density less than 1,78 t/m3 )

— Non homogeneous heavy cargo, if allowed

— Multiport loading/unloading conditions need not be considered.

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Annex B Annexes to Section 4-I B.11

3.1.1 Forces

The forces Pfr,a and Pfr,b , in kN, to be considered for the strength checks at sections a) and b) of side frames
(specified in Fig. B.11.4; in the case of separate lower brackets, section b) is at the top of the lower bracket),
are given by:
Pfr,a = Ps + max(P1 , P2 )
h – 2hB
Pfr,b = Pfr,a
h

Figure B.11.4 Section a) and b)

Where :

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.11

ps = still water
 force, inkN
ps,U + ps,L
s·h when the upper end of the side frame span h (see Fig. B.11.1 is
= 2
belowthe load water line
0 ps,L
s·h when the upper end of the side frame span h (see Fig. B.11.1 is at or
= 2
above the load water line
p1 = waveforce, in kN,  in head sea
p1,U + p1,L
= s·h
2
p2 = waveforce, in kN,  in head sea
p2,U + p2,L
= s·h
2
side frame span and lower bracket length, in m, defined in Fig. B.11.1 and Fig. B.11.4,
h, hb =
respectively
distance, in m, between the lower end of side frame span h (see Fig. B.11.1) and the
h’ =
load water line
a = frame spacing, in m
still water pressure, in kN/m2 , at the upper and lower end of the side frame span h
ps,U , ps,L =
(see Fig. B.11.1), respectively
wave pressure, in kN/m2 , as defined in 3.1.2.1) below for the upper and lower end of
p1,U , p1,L =
the side frame span h, respectively
wave pressure, in kN/m2 , as defined in 3.1.2.2) below for the upper and lower end of
p2,U , p2,L =
the side frame span h, respectively

3.1.2 Wave Pressure

1) Wave pressure p1

— The wave pressure p1 , in kN/m2 , at and below the waterline is given by:
 
B
p1 = 150 p11 + 135 – 1, 2 (T – z)
2 (B + 75)
p11 = 3ks C + kf
— The wave pressure p1 , in kN/m2 , at and above the waterline is given by:
p1 = p1wl – 7, 5 (z – T)

2) Wave pressure p2

— The wave pressure p2 , in kN/m2 , at and below the waterline is given by:
 
50cr 0.5 · B + kf  z
p2 = 13 0, 5 · B + CB 0.7 + 2
2(B + 75) 14 T
— The wave pressure p2 , in kN/m2 , at and above the waterline is given by:
p2 = p2wl – 5, 0 (z – T)

where :

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Annex B Annexes to Section 4-I B.11

p1wl = p1 wave sea pressure at the waterline

p2wl = p2 wave sea pressure at the waterline
L = length, in m
B = greatest moulded breadth, in m
CB = block coefficient, but not to be taken less than 0,6
T = maximum design draught, in m
C = coefficient
300 – L 1,5
 
= 10, 75 – for 90 ≤ L ≤ 300 m
100
= 10,75
 for 300 m < L 
2kr
Cr = 1, 25 – 0, 025 √ k
GM
k = 1,2 for ships without bilge keel
= 1,0 for ships with bilge keel
kr = roll radius of gyration. If the actual value of kr is not available:
0,39B for ships with even distribution of mass in transverse section (e.g.
=
alternate heavy cargo loading or homogeneous light cargo loading)
0,25B for ships with uneven distribution of mass in transverse section (e.g.
=
homogeneous heavy cargo distribution)
GM = 0,12B if the actual value of GM is not available
z = vertical distance, in m, from the baseline to the load point
0, 83
ks = CB + √ at aft end of L
CB
= CB between 0,2L and 0,6L from aft end of L
1, 33
= CB + at aft end of L
CB
Between the above specified points, ks is to be interpolated linearly.
kf = 0,8 C

3.2 Allowable stresses

The allowable normal and shear stresses σa and τa , in N/mm2 , in the side shell frames and brackets are
given by:
σa = 0, 90σf
τa = 0, 40σf
where σF is the minimum upper yield stress, in N/mm2 , of the material.

3.3 Shear strength check

Where tM in the lower part of side frames, as defined in Fig. B.11.1, is equal to or less than tCOAT , shear
strength check is to be carried out in accordance with the following.
The thickness tREN,S , in mm, is the greater of the thicknesses tREN,Sa and tREN,Sb obtained from the shear
strength check at sections a) and b) (see Fig. B.11.4 and 3.1) given by the following, but need not be taken
in excess of 0,75 · tw .
1000ks Pfr,a
— at section a) : tREN,Sa =
da sinφτa
1000ks Pfr,b
— at section b) : tREN,Sb =
db sinφτa

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Annex B Annexes to Section 4-I B.11

where :

kS = shear force distribution factor, to be taken equal to 0,6

Pfr,a , Pfr,b = pressures forces defined in 3.1.1
bracket and frame web depth, in mm, at sections a) and b), respectively (see
da , db = Fig. B.11.4); in case of separate (non-integral) brackets, db is to be taken as
the minimum web depth deducing possible scallops
φ = angle between frame web and shell plate
τa = allowable shear stress, in N/mm2 , defined in 3.2.

3.4 Bending strength check

Where the lower bracket length or depth does not meet the requirements in Rules for Hull (Pt.1, Vol.II)
Sec.23.B.5.2, the actual section modulus, in cm3 , of the brackets and side frames at sections a) and b) is to
be not less than:
1000Pfr,a h
— at section a): Za =
ma σa
1000Pfr,a h
— at section b): Zb =
mb σa
where :

Pfr,a = pressures forces defined in 3.1.1

h = side frame span, in m, defined in Fig. B.11.1
σa = allowable normal stress, in N/mm2 , defined in 3.2
ma , mb = bending moment coefficients defined in Table B.11.2

The actual section modulus of the brackets and side frames is to be calculated about an axis parallel to the
attached plate, based on the measured thicknesses. For pre-calculations, alternative thickness values may
be used, provided they are not less than:
— tREN , for the web thickness

— the minimum thicknesses allowed by BKI renewal criteria for flange and attached plating.

The attached plate breadth is equal to the frame spacing, measured along the shell at midspan of h.
If the actual section moduli at sections a) and b) are less than the values Wa and Wb , the frames and
brackets are to be renewed or reinforced in order to obtain actual section moduli not less than 1,2 · Wa
and 1,2 · Wb , respectively.
In such a case, renewal or reinforcements of the flange are to be extended over the lower part of side
frames, as defined in Fig. B.11.1.

Table B.11.2 Bending moment coefficients ma and mb

ma mb
hB ≤ 0,08 h hB = 0,1h hB = 0,125 h
Empty holds of ships approved to operate in non-
10 17 19 22
homogeneous loading conditions.
Other cases 12 20 22 26
Note 1: Non homogeneous loading condition means a loading condition in which the ratio between the highest and the
lowest filling ratio, evaluated for each hold, exceeds 1,20 corrected for different cargo densities.

Note 2: For intermediate value of the bracket length hB , the coefficient mb is obtained by linier interpolation between the
table values.

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

B.12 ESP Survey Reporting Principles

As a principle, for ships which are subject to ESP, the surveyor is to include the following content in his
report for survey of hull structure and piping systems, as relevant for the survey.
The structure of the reporting content may be different, depending on the report system for the respective
Societies.

1. General
1.1 A survey report is to be generated in the following cases:

1. In connection with commencement, continuation and / or completion of periodical hull surveys, i.e.
annual, intermediate and renewal surveys, as relevant

2. When structural damages / defects have been found

3. When repairs, renewals or modifications have been carried out

4. When condition of class (recommendation) has been imposed or deleted

1.2 The purpose of reporting is to provide:

1. Evidence that prescribed surveys have been carried out in accordance with applicable classification
rules

2. Documentation of surveys carried out with findings, repairs carried out and condition of class
(recommendation) imposed or deleted

3. Survey records, including actions taken, which shall form an auditable documentary trail. Survey
reports are to be kept in the survey report file required to be on board

4. Information for planning of future surveys

5. Information which may be used as input for maintenance of classification rules and instructions

1.3 When a survey is split between different survey stations, a report is to be made for each portion
of the survey. A list of items surveyed, relevant findings and an indication of whether the item has been
credited, are to be made available to the next attending surveyor, prior to continuing or completing the
survey. Thickness measurement and tank testing carried out is also to be listed for the next surveyor.

2. Extent of the survey

2.1 Identification of compartments where an overall survey has been carried out.
2.2 Identification of locations, in each ballast tank and cargo hold including hatch covers and coamings,
where a close-up survey has been carried out, together with information of the means of access used.
2.3 Identification of locations, in each ballast tank and cargo hold including hatch covers and coamings,
where thickness measurement has been carried out.
Note:
As a minimum, the identification of location of close-up survey and thickness measurement is to
include a confirmation with description of individual structural members corresponding to the extent of
requirements stipulated in this requirement based on type of periodical survey and the ship’s age.
Where only partial survey is required, i.e. 25% of shell frames, one transverse web, two selected cargo
hold transverse bulkheads, the identification is to include location within each ballast tank and cargo hold
by reference to frame numbers.

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Annex B Annexes to Section 4-I B.12

2.4 For areas in ballast tanks and cargo holds where protective coating is found to be in GOOD condition
and the extent of close-up survey and / or thickness measurement has been specially considered, structures
subject to special consideration are to be identified.
2.5 Identification of tanks subject to tank testing.
2.6 Identification of piping systems on deck and within cargo holds, ballast tanks, pipe tunnels, cofferdams
and void spaces where:
1. Examination including internal examination of piping with valves and fittings and thickness
measurement, as relevant, has been carried out
2. Operational test to working pressure has been carried out

3. Result of the survey

3.1 Type, extent and condition of protective coating in each tank, as relevant (rated GOOD, FAIR or POOR).
3.2 Structural condition of each compartment with information on the following, as relevant:
1. Identification of findings, such as:
— Corrosion with description of location, type and extent
— Areas with substantial corrosion
— Cracks / fractures with description of location and extent
— Buckling with description of location and extent
— Indents with description of location and extent
2. Identification of compartments where no structural damages / defects are found
3. The report may be supplemented by sketches / photos.
3.3 Thickness measurement report is to be verified and signed by the surveyor controlling the
measurements on board.
3.4 Evaluation result of longitudinal strength of the hull girder of oil tankers of 130 m in length and
upwards and over 10 years of age. The following data is to be included, as relevant:
1) measured and as-built transverse sectional areas of deck and bottom flanges;
2) diminution of transverse sectional areas of deck and bottom flanges;
3) details of renewals or reinforcements carried out, as relevant (as per 4.2)

4. Actions taken with respect to findings

4.1 Whenever the attending surveyor is of the opinion that repairs are required, each item to be repaired
is to be identified in the survey report. Whenever repairs are carried out, details of the repairs effected are
to be reported by making specific reference to relevant items in the survey report.
4.2 Repairs carried out are to be reported with identification of:
1) Compartment
2) Structural member
3) Repair method (i.e. renewal or modification) including:
— steel grades and scantlings (if different from the original);
— sketches/photos, as appropriate;
4) Repair extent
5) NDT / Tests

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

4.3 For repairs not completed at the time of survey, condition of class is to be imposed with a specific
time limit for the repairs. In order to provide correct and proper information to the surveyor attending for
survey of the repairs, condition of class is to be sufficiently detailed with identification of each item to be
repaired.
For identification of extensive repairs, reference may be given to the survey report.

5. Attachment
In accordance with the above requirements, it can be concluded that reports for each type of ship are
prepared as follows:

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Report 1
Executive Hull Summary for Oil Tanker/Chemical Tanker
(Issued upon Completion of Renewal Survey)

General particulars

Ship’s name Class identify number

Port of registry IMO identify number
Deadweight (t) National flag
Date of build Gross tonnage
Date of major conversion Classification notation
Type of conversion Owner

a) The survey reports and documents listed below have been reviewed by the undersigned and found
to be satisfactory

b) A summary of the survey is attached herewith on sheet 2

c) The hull renewal survey has been completed in accordance with the Rules on [date]

Executive Summary
Name: Title:
Report completed by:
Signature:
OFFICE DATE
Executive Summary
Name: Title:
Report verified by:
Signature:
OFFICE DATE

Attached reports and documents:

1)

2)

3)

4)

5)

6)

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Executive Hull Summary

A) General Particulars: - Refer to previous page

B) Report Review: - Where and how survey was done
C) Close-up Survey: - Extent (Which tanks)
D) Cargo & ballast piping system: - Examined
- Operationally tested
Reference to Thickness Measurement
E) Thickness measurements: -
report
- Summary of where measured
Separate form indicating the tanks/areas with
-
Substantial Corrosion, and corresponding
- Thickness diminution
- Corrosion pattern
F) Tank Protection: Separate form indicating:
- Location of coating
- Condition of coating (if applicable)
G) Repairs: - Identification of tanks/areas
H) Conditions of Class:
I) Memoranda: - Acceptable defects
Any points of attention for future
-
surveys, e.g. for Suspect Areas.
Examination of ballast tanks at annual
-
surveys due to coating breakdown
Evaluation results of the ship’s longitudinal strength (for oil tankers of 130 m in
J)
length and upwards and of over 10 years of age)
Statement on evaluation/verification of
K) Conclusion: -
Survey report

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Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Extract of Thickness Measurements (NON-CSR SHIPS)

(Reference is made to the thickness measurements report)

Positions of
substantially Remarks:
corroded tanks/areas Thickness diminution [%] Corrosion pattern2 e.g. ref. attached
or areas with deep sketches
pitting1

Remarks:
1 substantial corrosion, i.e. 75% to 100% of acceptable margins wasted.
2 P = Pitting;
C = Corrosion in general.
Any bottom plating with a pitting intensity of 20% or more, with wastage in the substantial corrosion range
or having an average depth of pitting of 1/3 or more of actual plate thickness is to be noted.

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Annex B Annexes to Section 4-I B.12

Space Protection

Tank Nos1 Tank protection2 Coating condition3 Remarks

Note:
1 All segregated ballast tanks and combined cargo/ballast tanks to be listed.
2 C = Coating; NP = No Protection.
3 Coating condition according to the following standard:
GOOD condition with only minor spot rusting;
condition with local breakdown at edges of stiffeners and weld connections and/or light rusting over
FAIR
20% or more of areas under consideration, but less than as defined for POOR condition;
condition with general breakdown of coating over 20% or more
POOR
of areas or hard scale at 10% or more of areas under consideration.
for ballast tanks, If coating condition less than “GOOD” is given, tanks are to be examined at annual surveys.
This is to be noted in Section 4.I.B.4.3 of the Executive Hull Summary.

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Annex B Annexes to Section 4-I B.12

Evaluation result of longitudinal strength of the hull girder of oil tankers of 130 m in length and upwards
and of over 10 years of age (Of sections 1, 2 and 3 below, only one applicable section is to be completed)
1. This section applies to ships regardless of the date of construction: Transverse sectional areas of
deck flange (deck plating and deck longitudinals) and bottom flange (bottom shell plating and bottom
longitudinals) of the ship’s hull girder have been calculated by using the thickness measured, renewed or
reinforced, as appropriate, during the renewal survey most recently conducted after the ship reached 10
years of age, and found that the diminution of the transverse sectional area does not exceed 10% of the
as-built area, as shown in Table B 12.1:

Table B.12.1 Transverse Sectional Area of Hull Girder Flange

Measured As-built Diminution

Tranverse Deck flange cm2 cm2 cm2 (%)
section 1 Bottom flange cm2 cm2 cm2 (%)
Transverse Deck flange cm2 cm2 cm2 (%)
section 2 Bottom flange cm2 cm2 cm2 (%)
Transverse Deck flange cm2 cm2 cm2 (%)
section 3 Bottom flange cm2 cm2 cm2 (%)

2. This section applies to ships constructed on or after 1 July 2002: Section moduli of transverse section of
the ship’s hull girder have been calculated by using the thickness of structural members measured, renewed
or reinforced, as appropriate, during the renewal survey most recently conducted after the ship reached
10 years of age in accordance with the provisions of Annex B.10, B.2.2 and are found to be within their
diminution limits determined by BKI4) , as shown in Table B.12.2:

Table B.12.2 Transverse Section Modulus of Hull Girder

Wact (cm3 )1 Wreq (cm3 )2 Remarks

Tranverse Upper deck
section 1 Bottom
Transverse Upper deck
section 2 Bottom
Transverse Upper deck
section 3 Bottom

Notes:
Wact means the actual section moduli of the transverse section of the ship’s hull girder calculated
1 by using the thickness of structural members measured, renewed or reinforced, as appropriate,
during the renewal survey, in accordance with the provisions of Annex B.10, B.2.2
Wreq means diminution limit of the longitudinal bending strength of ships, as calculated in
2 accordance with the provisions of Annex B.10, B.2.2. The calculation sheets for W
act are to be
attached to this report.

3. This section applies to ships constructed before 1 July 2002: Section moduli of transverse section of the
ship’s hull girder have been calculated by using the thickness of structural members measured, renewed
or reinforced, as appropriate, during the renewal survey most recently conducted after the ship reached
10 years of age in accordance with the provisions of Annex B.10, B.2.1.2, and found to meet the criteria
required by BKI and that Wact is not less than Wmc (defined in note 2 of Table B.12.3) as specified in Rules for
4)
The actual transverse section modulus of the hull girder of oil tankers calculated under Annex B.10, B.2.2 is not to be less
than 90% of the required section modulus for new buildings specified in IACS Unified Requirements S7 (C = 1.0 Cn is to be used for
the purpose of this calculation.) or S11, whichever is the greater.

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Annex B Annexes to Section 4-I B.12

Hull (Pt.1, Vol.II) Sec.5, C.2, as shown in Table B.12.3. Describe the criteria for acceptance of the minimum
section moduli of the ship’s hull girder for ships in service required by BKI.

Table B.12.3 Transverse Section Modulus of Hull Girder

Wact (cm3 )1 Wreq (cm3 )2 Remarks

Tranverse Upper deck
section 1 Bottom
Transverse Upper deck
section 2 Bottom
Transverse Upper deck
section 3 Bottom

Notes:
1 As defined in note 1 of Table B.12.2.

2 Wmc means the di minution limit of minimum section modulus calculated in accordance with
provisions of Annex B.10, B.2.1.2.

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Annex B Annexes to Section 4-I B.12

Report 2
Executive Hull Summary for Bulk Carrier
(Issued upon Completion of Renewal Survey)

General particulars

Ship’s name Class identify number

Port of registry IMO identify number
Deadweight (t) National flag
Date of build Gross tonnage
Date of major conversion Classification notation
Type of conversion Owner

a) The survey reports and documents listed below have been reviewed by the undersigned and found
to be satisfactory

b) A summary of the survey is attached herewith on sheet 2

c) The hull renewal survey has been completed in accordance with the Rules on [date]

Executive Summary
Name: Title:
Report completed by:
Signature:
OFFICE DATE
Executive Summary
Name: Title:
Report verified by:
Signature:
OFFICE DATE

Attached reports and documents:

1)

2)

3)

4)

5)

6)

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Pt 1 Seagoing Ships
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Annex B Annexes to Section 4-I B.12

Executive Hull Summary

A) General Particulars: - Refer to previous page

B) Report Review: - Where and how survey was done
C) Close-up Survey: - Extent (Which tanks)
Reference to Thickness Measurement
D) Thickness measurements: -
report
- Summary of where measured
Separate form indicating the tanks/areas with
-
Substantial Corrosion, and corresponding
- Thickness diminution
- Corrosion pattern
E) Tank Protection: Separate form indicating:
- Location of coating
If coating condition “POOR” is given, extended
- annual surveys are to be introduced. This is to
be noted in part G) of the Executive Hull Summary.
F) Repairs: - Identification of tanks/areas
G) Conditions of Class:
H) Memoranda: - Acceptable defects
Any points of attention for future
-
surveys, e.g. for Suspect Areas.
Examination of ballast tanks at annual surveys
-
due to coating breakdown
Statement on evaluation/verification of
I) Conclusion: -
Survey report

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Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Extract of Thickness Measurements (NON-CSR SHIPS)

(Reference is made to the thickness measurements report)

Positions of
substantially Remarks:
corroded tanks/areas Thickness diminution [%] Corrosion pattern2 e.g. ref. attached
or areas with deep sketches
pitting1

Remarks:
1 Substantial corrosion, an extent of corrosion such that the assessment of the corrosion pattern indicates a
measured thickness between tren + 0.5mm and tren .
2 P = Pitting C = Corrosion in general
Any bottom plating with a pitting intensity of 20% or more, with wastage in the substantial corrosion
range or having an average depth of pitting of 1/3 or more of actual plate thickness is to be noted.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-57

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Space Protection

Tank Nos1 Tank protection2 Coating condition3 Remarks

Note:
1 All ballast tanks and cargo holds to be listed.
2 C = Coating; NP = No Protection.
3 Coating condition according to the following standard:
GOOD condition with only minor spot rusting;
condition with local breakdown at edges of stiffeners and weld connections and/or light rusting over
FAIR
20% or more of areas under consideration, but less than as defined for POOR condition;
condition with general breakdown of coating over 20% or more
POOR
of areas or hard scale at 10% or more of areas under consideration.
If coating condition less than “GOOD” is given, extended annual surveys are to be introduced. This is to be
noted in H of the Executive Hull Summary.

Page B-58 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Report 3
Executive Hull Summary for Double Skin Bulk Carrier
(Issued upon Completion of Renewal Survey)

General particulars

Ship’s name Class identify number

Port of registry IMO identify number
Deadweight (t) National flag
Date of build Gross tonnage
Date of major conversion Classification notation
Type of conversion Owner

a) The survey reports and documents listed below have been reviewed by the undersigned and found
to be satisfactory

b) A summary of the survey is attached herewith on sheet 2

c) The hull renewal survey has been completed in accordance with the Rules on [date]

Executive Summary
Name: Title:
Report completed by:
Signature:
OFFICE DATE
Executive Summary
Name: Title:
Report verified by:
Signature:
OFFICE DATE

Attached reports and documents:

1)

2)

3)

4)

5)

6)

Biro Klasifikasi Indonesia - January 2025 Edition Page B-59

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Executive Hull Summary

A) General Particulars: - Refer to previous page

B) Report Review: - Where and how survey was done
C) Close-up Survey: - Extent (Which tanks)
Reference to Thickness Measurement
D) Thickness measurements: -
report
- Summary of where measured
Separate form indicating the tanks/areas with
-
Substantial Corrosion, and corresponding
- Thickness diminution
- Corrosion pattern
Tank/ hold/ double-
E) side skin void space - Separate form indicating:
Protection:
- Location of coating
- Condition coating (if applicable)
F) Repairs: - Identification of tanks/areas
G) Conditions of Class:
H) Memoranda: - Acceptable defects
Any points of attention for future
-
surveys, e.g. for Suspect Areas.
Examination of ballast tanks and double-side
- skin void spaces at annual surveys due
to coating breakdown
Statement on evaluation/verification of
I) Conclusion: -
Survey report

Page B-60 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Extract of Thickness Measurements (NON-CSR SHIPS)

(Reference is made to the thickness measurements report)

Positions of
substantially Remarks:
corroded tanks/areas Thickness diminution [%] Corrosion pattern2 e.g. ref. attached
or areas with deep sketches
pitting1

Remarks:
1 Substantial corrosion, i.e. 75% to 100% of acceptable margins wasted.
2 P = Pitting C = Corrosion in general
Any bottom plating with a pitting intensity of 20% or more, with wastage in the substantial corrosion
range or having an average depth of pitting of 1/3 or more of actual plate thickness is to be noted.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-61

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.12

Tank Protection

Tank Nos1 Tank protection2 Coating condition3 Remarks

Note:
1 All ballast tanks and cargo holds to be listed.
2 C = Coating; NP = No Protection.
3 Coating condition according to the following standard:
GOOD condition with only minor spot rusting;
condition with local breakdown at edges of stiffeners and weld connections and/or light rusting over
FAIR
20% or more of areas under consideration, but less than as defined for POOR condition;
condition with general breakdown of coating over 20% or more
POOR
of areas or hard scale at 10% or more of areas under consideration.
For ballast tanks, If coating condition less than “GOOD” is given, tanks are to be examined at annual surveys.
This is to be noted in H) of the Executive Hull Summary.
For double-side skin void spaces on bulk carriers exceeding 20 years of age and of 150 m in length and upwards,
if coating condition POOR is given, those voids are to be examined at annual surveys. This is to be noted in H) of
Executive Hull Summary.

Page B-62 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

B.13 Recommended Procedures for Thickness Measurements1)

A. Recommended Procedures for Thickness Measurements of Ships

Notes:
1. This document is to be used for recording thickness measurements for all ships as required by Section
3, D.
2. Reporting forms TM1-G, TM2-G (i) and (ii), TM3-G, TM4-G, TM5-G (sheets 4 to 9) are to be used for
recording thickness measurements and the maximum allowable diminution is to be stated. The maximum
allowable diminution is to be stated in an attached document.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:*

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate.

1)
This Appendix is recommendatory. For ESP ships, IMO No. is to be marked in the general particulars.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-63

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-G Report on Thickness Measurement of All Deck Plating, All Bottom Shell Plating or
Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
Org. Forward Reading Aft Reading Mean Maximum
PLATE No. or
Thk. Diminution Diminution Diminution Diminution Diminution Allowable
POSITION Letter Gauged Gauged
mm P S P S % Diminution
P S mm % mm % P S mm % mm % P S mm
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

A— All strength deck plating within the cargo length area.

B— All keel, bottom shell plating and bilge plating within the cargo length area.
C— Side shell plating that is all wind and water strakes within the cargo length area.
D— Side shell plating that is selected wind and water strakes outside the cargo length area.

2. The strake position is to be clearly indicated as follows:

1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate.
3. For side shell plating give number of the strake of plating below sheer strake and letter as shown
on shell expansion.

3. Only the deck plating strakes outside line of openings are to be recorded.

4. Measurements are to be taken at the forward and aft areas of all plates, and the single measurements
recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.

Page B-64 Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 5
TM2-G(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
STRAKE POSITION Thk. P S Thk. P S Thk. P S
Letter Dim. Letter Dim. Letter Dim.
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Pt 1 Seagoing Ships

Stringer
plate
1st strake
inboard
Annex B Annexes to Section 4-I

2nd
3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th

Biro Klasifikasi Indonesia - January 2025 Edition

8th
9th
10th
11th
12th
13th
14th
Centre
strake
Sheer
strake
TOPSIDE
TOTAL

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of: Strength deck plating and sheer strake plating transverse sections:

Two or three sections within the cargo length area, comprising of the structural items.

2. Only the deck plating strakes outside the line of openings are to be recorded.
B.13

Page B-65
 3. The topside area comprises deck plating, stringer plate and sheerstrake (including rounded gunwales).

4. The exact frame station of measurement is to be stated.

Page B-66
5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 6
TM2-G(ii) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
1st below
sheer
strake
2nd
Annex B Annexes to Section 4-I

3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th

Biro Klasifikasi Indonesia - January 2025 Edition

9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
keel strake
BOTTOM
TOTAL

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurement of: Shell plating transverse sections:
B.13

Page B-67
Two or three sections within the cargo length area, comprising of the structural items.
 2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

Page B-68
4. The single measurements recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 7
TM3-G Report on Thickness Measurement of Longitudinal Members (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRUCTURAL No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
MEMBER Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

Operators signature: .............................................
Notes:

1. This report is to be used for recording the thickness measurement of: Longitudinal members at transverse sections:

Two or three sections within the cargo length area, comprising of the appropriate structural items.

2. The exact frame station of measurement is to be stated.

B.13

Page B-69
 3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-70
Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-G Report on Thickness Measurement of Transverse Bulkheads
Within the cargo tank or cargo hold space

Ship’s name......................... Class identity No. ......................... Report No. .........................

LOCATION OF STRUCTURE: FRAME NO.:
STRUCTURAL COMPONENT (PLATING/STIFFENER)
Max.
Original
Alwb. Diminution Diminution
Thickness Gauged
Dim. P S
mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of cargo hold transverse bulkheads.

2. The single measurements recorded are to represent the average of multiple measurements.

3. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-71

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-G Report on Thickness measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL COMPONENT Thickness Gauged
Dim. P S
(PLATING/STIFFENER) mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of miscellaneous structural
members including the structural items (36), (37) and (38).

2. The single measurements recorded are to represent the average of multiple measurements.

3. The maximum allowable diminution could be stated in an attached document.

Page B-72 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

B. Recommended Procedures for Thickness Measurements of Ships Built According to The Net
Scantling Approach1)

Notes:
1. This document is to be used for recording thickness measurements of ships built according to the net
scantling approach as required by Section 3, D.
2. Reporting forms TM1-G(NSD), TM2-G(NSD) (i) and (ii), TM3-G(NSD), TM4-G(NSD), TM5-G(NSD) (sheets
4 to 9) are to be used for recording thickness measurements. The as-built thickness, the voluntary thickness
addition and renewal thickness (minimum allowable thickness) are to be stated in the said forms.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:*

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate.

1)
This Appendix is recommendatory.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-73

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-G(NSD) Report on Thickness Measurement of All Deck Plating, All Bottom Plating or Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
No. or As Built Voluntary Renewal Forward Reading Aft Reading Mean Remaining Corr.
PLATE
Letter Thk. Thickness Thickness Gauged Thk. Remaining Corr. Gauged Thk. Remaining Corr. Addition, mm
POSITION
mm Addition mm mm Addition, mm mm Addition, mm
mm (b1) (c1) = (b1) – (a) (b2) (c2) = (b2) – (a) [(c1) + (c2)]/2
(a) P S P S P S P S P S
12th
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st forward
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

A— All strength deck plating within cargo length area.

B— All keel, bottom shell plating and bilge plating within the cargo length area.
C— Side shell plating that is all wind and water strakes within the cargo length area.
D— Side shell plating that is selected wind and water strakes outside the cargo length area.

2. The strake position is to be clearly indicated as follows:

1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate.
3. For side shell plating give number of the strake of plating sheer strake and letter as shown on
shell expansion.

3. Only the deck plating strakes outside the line of openings are to be recorded.

4. Measurements are to be taken at the forward and aft areas of all plates and the single measurements
recorded are to represent the average of multiple measurements.

5. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal
thickness. If the result is between 0 and substantial corrosion allowable limits, the structure in way is
to be additionally gauged, and the mark “S” is to be indicated in the right-hand column.

Page B-74 Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 5
TM2-G(NSD)(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Remaining Remaining Remaining
Gauged Gauged Gauged
Corr. Addition, Corr. Addition, Corr. Addition,
No. or As Built Vol. Thk. Ren. Thk. mm No. or As Built Vol. Thk. Ren. Thk. mm No. or As Built Vol. Thk. Ren. Thk. mm
STRAKE POSITION mm mm mm
Letter Thk. Add. mm Thk. (b) Letter Thk. Add. mm Thk. (b) Letter Thk. Add. mm Thk. (b)
(b)-(a) (b)-(a) (b)-(a)
mm mm (a) mm mm (a) mm mm (a)
P S P S P S P S P S P S
Pt 1 Seagoing Ships

Stringer plate
1st strake
inboard
2nd
3rd
Annex B Annexes to Section 4-I

4th
5th
6th
7th
Vol I Rules for Classification and Surveys

8th
9th

Biro Klasifikasi Indonesia - January 2025 Edition

10th
11th
12th
13th
14th
Centre strake
Sheer strake
TOPSIDE TOTAL

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of: Strength deck plating and sheer strake plating transverse sections: One, two or three
sections within the cargo length area, comprising of the structural items.

2. Only the deck plating strakes outside the line of openings are to be recorded.

3. The topside area comprises deck plating, stringer plate and sheer strake (including rounded gunwales).

4. The exact frame station of measurement is to be stated.

5. The single measurements recorded are to represent the average of multiple measurements.
B.13

Page B-75
 6. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal thickness. If the result is negative, the structure in way is to
be renewed, and the mark “R” is to be indicated in the right-hand column. If the result is between 0 and substantial corrosion allowable limits, the structure
in way is to be additionally gauged, and the mark “S” is to be indicated in the right-hand column.

Page B-76
Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 6
TM2-G(NSD)(ii) Report on Thickness Measurement of Shell Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Remaining Remaining Remaining
Gauged Gauged Gauged
Corr. Addition, Corr. Addition, Corr. Addition,
No. or As Built Vol. Thk. Ren. Thk. mm No. or As Built Vol. Thk. Ren. Thk. mm No. or As Built Vol. Thk. Ren. Thk. mm
STRAKE POSITION mm mm mm
Letter Thk. Add. mm Thk. (b) Letter Thk. Add. mm Thk. (b) Letter Thk. Add. mm Thk. (b)
(b)-(a) (b)-(a) (b)-(a)
mm mm (a) mm mm (a) mm mm (a)
P S P S P S P S P S P S
Pt 1 Seagoing Ships

1st below sheer

strake
2nd
3rd
4th
Annex B Annexes to Section 4-I

5th
6th
7th
8th
Vol I Rules for Classification and Surveys

9th
10th

Biro Klasifikasi Indonesia - January 2025 Edition

11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
Keel strake
BOTTOM TOTAL

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurement of: Shell plating transverse sections: One, two or three sections within the cargo length area,
comprising of the structural items.

2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

B.13

Page B-77
4. The single measurements recorded are to represent the average of multiple measurements.
 5. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal thickness. If the result is negative, the structure in way is to
be renewed, and the mark “R” is to be indicated in the right-hand column. If the result is between 0 and substantial corrosion allowable limits, the structure
in way is to be additionally gauged, and the mark “S” is to be indicated in the right-hand column.

Page B-78
Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 7
TM3-G(NSD) Report on Thickness Measurement of Longitudinal Members (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Remaining Remaining Remaining
Gauged Gauged Gauged
Corr. Addition, Corr. Addition, Corr. Addition,
STRUCTURAL Item As Built Vol. Thk. Ren. Thk. mm Item As Built Vol. Thk. Ren. Thk. mm Item As Built Vol. Thk. Ren. Thk. mm
mm mm mm
MEMBER No. Thk. Add. mm Thk. (b) No. Thk. Add. mm Thk. (b) No. Thk. Add. mm Thk. (b)
(b)-(a) (b)-(a) (b)-(a)
mm mm (a) mm mm (a) mm mm (a)
Pt 1 Seagoing Ships

P S P S P S P S P S P S
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

Operators signature: .............................................
Notes:

1. This report is to be used for recording the thickness measurement of: Longitudinal Members at transverse sections: One, two or three sections within the cargo
length area, comprising of the appropriate structural items.

2. The exact frame station of measurement is to be stated.

3. The single measurements recorded are to represent the average of multiple measurements.
B.13

Page B-79
 4. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal thickness. If the result is negative, the structure in way is to
be renewed, and the mark “R” is to be indicated in the right-hand column. If the result is between 0 and substantial corrosion allowable limits, the structure
in way is to be additionally gauged, and the mark “S” is to be indicated in the right-hand column.

Page B-80
Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-G(NSD) Report on Thickness Measurement of Transverse Bulkheads

Ship’s name......................... Class identity No. .........................

Report No. .........................
LOCATION OF STRUCTURE: FRAME NO.:
STRUCTURAL COMPONENT (PLATING/STIFFENER)
Gauged Thickness Remaining Corr.
STRUCTURAL COMPONENT As Built Voluntary Renewal mm Addition mm
(PLATING/STIFFENER) Thickness Thickness Thickness (b) (b)-(a)
mm Addition mm mm P S P S

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of cargo hold transverse bulkheads.

2. The single measurements recorded are to represent the average of multiple measurements.

3. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal
thickness. If the result is negative, the structure in way is to be renewed, and the mark “R” is to be
indicated in the right-hand column. If the result is between 0 and substantial corrosion allowable
limits, the structure in way is to be additionally gauged, and the mark “S” is to be indicated in the
right-hand column.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-81

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-G(NSD) Report on Thickness Measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL COMPONENT: SKETCH
LOCATION OF STRUCTURE:
Gauged Remaining
Thickness Corr.
As Built Voluntary Renewal
Description mm Addition mm
Thk. mm Thickness Thickness mm
(b) (b)-(a)
Addition mm (a)
P S P S

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of miscellaneous structural
members.

2. The single measurements recorded are to represent the average of multiple measurements.

3. The remaining corrosion addition is to be recorded with result of gauged thickness minus renewal
thickness. If the result is negative, the structure in way is to be renewed, and the mark “R” is to be
indicated in the right-hand column. If the result is between 0 and substantial corrosion allowable
limits, the structure in way is to be additionally gauged, and the mark “S” is to be indicated in the
right-hand column.

Page B-82 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

1. Recommended Procedures for Thickness Measurements of Oil Tankers, Ore/Oil Ships, etc.1)

Notes:
1. This document is to be used for recording thickness measurements for oil tanks as required by Section
4, B.
2. Sheets TM1-T, TM2-T, TM3-T, TM4-T, TM5-T and TM6-T (sheets 4 to 10) are to be used for recording
thickness measurements and the maximum allowable diminution is to be stated.
The maximum allowable diminution could be stated in an attached document.
3. The remaining sheets 11 to 15 are guidance diagrams and notes relating to the reporting format and
the procedure for the thickness measurements.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:*

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate

1)
The Recommended Procedures for Thickness Measurements are also applicable to chemical tankers.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-83

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-T Report on Thickness Measurement of All Deck Plating, All Bottom Shell Plating or
Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
Org. Forward Reading Aft Reading Mean Maximum
PLATE No. or
Thk. Diminution Diminution Diminution Diminution Diminution Allowable
POSITION Letter Gauged Gauged
mm P S P S % Diminution
P S mm % mm % P S mm % mm % P S mm
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

A— All strength deck plating within the cargo area.

B— All keel, bottom shell plating and bilge plating within the cargo area.
C— Side shell plating including selected wind and water strakes outside cargo area.
D— All wind and water strakes within cargo area.

2. The strake position is to be clearly indicated as follows:

1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate.
3. For side shell plating give number of the strake of plating below sheer strake and letter as shown
on shell expansion.

3. For oil tankers all deck plating strakes are to be recorded, for ore/oil ships only the deck plating strakes
outside line of openings are to be recorded.

4. Measurements are to be taken at the forward and aft areas of all and where plates cross ballast/cargo
tank boundaries separate measurements for the area of plating in way of each type of tank are to be
recorded.

Page B-84 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-85

 Sheet 5
TM2-T(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-86
STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
STRAKE POSITION Thk. P S Thk. P S Thk. P S
Letter Dim. Letter Dim. Letter Dim.
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Pt 1 Seagoing Ships

Stringer
plate
1st strake
inboard
Annex B Annexes to Section 4-I

2nd
3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
Centre
strake
Sheer
strake
TOPSIDE
TOTAL

Operators signature: .............................................

Notes:

1. This report form is to be used for recording the thickness measurements of: Strength deck plating and sheer strake plating transverse sections:

One, two or three sections within the cargo area comprising of the structural items (1), (2) and (3) as shown on the diagrams of typical transverse sections.

2. For oil tankers all deck plating strakes are to be recorded and for ore/oil ships only the deck plating strakes outside the line of openings are to be recorded.
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 3. The topside area comprises deck plating, stringer plate and sheer strake (including rounded gunwales).

4. The exact frame station of measurement is to be stated.

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-87
 Sheet 6
TM2-T(ii) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-88
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
1st below
sheer
strake
2nd
Annex B Annexes to Section 4-I

3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
keel strake
BOTTOM
TOTAL

Operators signature: .............................................

Notes:
1. This report form is to be used for recording the thickness measurements of: Shell plating transverse sections:
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

One, two or three sections within the cargo area comprising of the structural items (4), (5) and (6) and (7) as shown on the diagrams of typical transverse
 sections.

2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.
Pt 1 Seagoing Ships

5. The maximum allowable diminution could be stated in an attached document.

Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-89
 Sheet 7
TM3-T Report on Thickness Measurement of Longitudinal Members (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-90
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRUCTURAL No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
MEMBER Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurements of: Longitudinal members at transverse sections:

One, two or three sections within the cargo area comprising of the appropriate structural items (8) to (20) as shown on the diagrams of typical transverse
sections.
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

2. The exact frame station of measurement is to be stated.
 3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-91
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-T Report on Thickness Measurement of Transverse Structural Members
In the cargo oil and water ballast tanks within the cargo tank length

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL Thickness Gauged
ITEM Dim. P S
MEMBER mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurements of transverse structural members,
comprising of the appropriate structural items (25) to (33) as shown on diagrams of typical transverse
section.

2. Guidance for areas of measurement is indicated on Sheet 15 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-92 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-T Report on Thickness of W.T./O.T. Transverse Bulkheads
Within the cargo tank or cargo hold space

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK/HOLD DESCRIPTION:
LOCATION OF STRUCTURE: FRAME NO.:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL Thickness Gauged
Dim. P S
COMPONENT mm
mm
(PLATING/STIFFENER)
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of W.T./O.T. transverse bulkheads.

2. Guidance for areas of measurement is indicated on Sheet 15 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-93

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 10
TM6-T Report on Thickness measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL COMPONENT Thickness Gauged
Dim. P S
(PLATING/STIFFENER) mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of miscellaneous structural
members including the structural items (36), (37) and (38).

2. The single measurements recorded are to represent the average of multiple measurements.

3. The maximum allowable diminution could be stated in an attached document.

Page B-94 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 11
Thickness Measurement - Oil Tankers, Ore/Oil Ships and etc.
Oil Tanker - Typical Transverse Section Indicating Longitudinal and Transverse Members

Report on TM2-T(1) & (2) Report on TM3-T Report on TM4-T

1. Strength deck plating 8. Deck longitudinals 25. Deck transverse centre tank
2. Stringer plate 9. Deck girders 26. Bottom transverse centre tank
3. Sheer strake 10. Sheer strake longitudinals 27. Deck transverse wing tank
4. Side shell plating 11. Longitudinal bulkhead top strake 28. Side shell vertical web
5. Bilge plating 12. Bottom longitudinals 29. Longitudinal bulkhead vertical web
6. Bottom shell plating 13. Bottom girders 30. Bottom transverse wing tank
7. Keel plate 14. Bilge longitudinals 31. Struts
15. Longitudinal bulkhead lower strake 32. Transverse web face plate
16. Side shell longitudinals 33. D.B.Floors
17. Longitudinal bulkhead plating
34.
(remainder)
18. Longitudinal bulkhead longitudinals 35.
19. Inner bottom plating
20. Inner bottom longitudinals Report on TM6-T
21. 36. Hatch coamings
22. 37. Deck plating between hatches
23. 38. Hatch covers
24. 39.
40.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-95

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 12
Thickness Measurement - Oil Tankers, Ore/Oil Ships and etc.
Oil/Ore Ship - Typical Transverse Section Indicating Longitudinal and Transverse Members

Report on TM2-T(1) & (2) Report on TM3-T Report on TM4-T

1. Strength deck plating 8. Deck longitudinals 25. Deck transverse centre tank
2. Stringer plate 9. Deck girders 26. Bottom transverse centre tank
3. Sheer strake 10. Sheer strake longitudinals 27. Deck transverse wing tank
4. Side shell plating 11. Longitudinal bulkhead top strake 28. Side shell vertical web
5. Bilge plating 12. Bottom longitudinals 29. Longitudinal bulkhead vertical web
6. Bottom shell plating 13. Bottom girders 30. Bottom transverse wing tank
7. Keel plate 14. Bilge longitudinals 31. Struts
15. Longitudinal bulkhead lower strake 32. Transverse web face plate
16. Side shell longitudinals 33. D.B.Floors
17. Longitudinal bulkhead plating
34.
(remainder)
18. Longitudinal bulkhead longitudinals 35.
19. Inner bottom plating
20. Inner bottom longitudinals Report on TM6-T
21. 36. Hatch coamings
22. 37. Deck plating between hatches
23. 38. Hatch covers
24. 39.
40.

Page B-96 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 13
Thickness Measurement - Oil Tankers, Ore/Oil Ships and etc.
Transverse Section Outline

To be used for longitudinal and transverse members where typical oil tanker or oil/ore ship sections are not
applicable

Report on TM2-T(1) & (2) Report on TM3-T Report on TM4-T

1. Strength deck plating 8. Deck longitudinals 25. Deck transverse centre tank
2. Stringer plate 9. Deck girders 26. Bottom transverse centre tank
3. Sheer strake 10. Sheer strake longitudinals 27. Deck transverse wing tank
4. Side shell plating 11. Longitudinal bulkhead top strake 28. Side shell vertical web
5. Bilge plating 12. Bottom longitudinals 29. Longitudinal bulkhead vertical web
6. Bottom shell plating 13. Bottom girders 30. Bottom transverse wing tank
7. Keel plate 14. Bilge longitudinals 31. Struts
15. Longitudinal bulkhead lower strake 32. Transverse web face plate
16. Side shell longitudinals 33. D.B.Floors
17. Longitudinal bulkhead plating
34.
(remainder)
18. Longitudinal bulkhead longitudinals 35.
19. Inner bottom plating
20. Inner bottom longitudinals Report on TM6-T
21. 36. Hatch coamings
22. 37. Deck plating between hatches
23. 38. Hatch covers
24. 39.
40.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-97

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 14
Thickness Measurement - Oil Tankers, Ore/Oil Ships and etc.
Typical Transverse Section Showing All Longitudinal Members to be Reported on TM2-T and TM3-T

Page B-98 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 15
Thickness Measurement - Oil Tankers, Ore/Oil Ships and etc.
Close-up Survey Requirements

Biro Klasifikasi Indonesia - January 2025 Edition Page B-99

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

C. Recommended Procedures for Thickness Measurements of Bulk Carriers

Notes:
1. This document is to be used for recording thickness measurements of single side skin bulk carriers as
required by Section 4.
2. Reporting forms TM1-BC, TM2-BC, TM3-BC, TM4-BC, TM5-BC, TM6-BC and TM7-BC (Sheets 4 to 11) are
to be used for recording thickness measurements and the minimum allowable diminution is to be stated.
The minimum allowable diminution could be stated in an attached document.
3. The remaining Sheets 12 to 14 are guidance diagrams and notes relating to the reporting forms and
the IACS Unified Requirements for thickness measurement.
4. The reporting forms are where appropriate, to be supplemented by data presented on structural
sketches.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:*

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate

Page B-100 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-BC Report on Thickness Measurement of All Deck Plating, All Bottom Shell Plating or
Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
Org. Forward Reading Aft Reading Mean Maximum
PLATE No. or
Thk. Diminution Diminution Diminution Diminution Diminution Allowable
POSITION Letter Gauged Gauged
mm P S P S % Diminution
P S mm % mm % P S mm % mm % P S mm
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

A— All strength deck plating within cargo length area.

B— Keel, bottom shell plating and bilge plating within the cargo length area.
C— Side shell plating that is selected wind and water strakes within the cargo length area.
D— Side shell plating that is all wind and water strakes outside the cargo length area.

2. The strake position is to be clearly indicated as follows:

1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate
3. For side shell plating give number of the strake of plating sheer strake and letter as shown on
shell expansion.

3. Only the deck plating strakes outside line of openings are to be recorded.

4. Measurements are to be taken at the forward and aft areas of all plates and the single measurements
recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-101

 Sheet 5
TM2-BC(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-102
STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
STRAKE POSITION Thk. P S Thk. P S Thk. P S
Letter Dim. Letter Dim. Letter Dim.
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Pt 1 Seagoing Ships

Stringer
plate
1st strake
inboard
Annex B Annexes to Section 4-I

2nd
3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
Centre
strake
Sheer
strake
TOPSIDE
TOTAL

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of: Strength deck plating and sheer strake plating transverse sections:

Two or three sections within the cargo length area, comprising of the structural items (1), (2) and (3) as shown on the diagram of typical transverse section.

2. Only the deck plating strakes outside the line of openings are to be recorded.
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 3. The topside area comprises deck plating, stringer plate and sheer strake (including rounded gunwales).

4. The exact frame station of measurement is to be stated.

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-103
 Sheet 6
TM2-BC(ii) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-104
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
1st below
sheer
strake
2nd
Annex B Annexes to Section 4-I

3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
keel strake
BOTTOM
TOTAL

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurement of: Shell plating transverse sections:
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

Two or three sections within cargo length area comprising of the structural (4), (5), (6) and (7) as shown on the diagram of typical transverse section.
 2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-105
 Sheet 7
TM3-BC Report on Thickness Measurement of Longitudinal Members (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-106
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRUCTURAL Item Alwb. Gauged Item Alwb. Gauged Item Alwb. Gauged
Thk. P S Thk. P S Thk. P S
MEMBER No. Dim. No. Dim. No. Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of: Longitudinal members at transverse sections:

One, two or three sections within the cargo length area, comprising of the appropriate structural items (8) to (20) as shown on diagram of typical transverse
section.
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 2. The exact frame station of measurement is to be stated.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-107
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-BC Report on Thickness Measurement of Transverse Structural Members
In the double bottom, hopper side and topside water ballast tanks

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL Thickness Gauged
ITEM Dim. P S
MEMBER mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of transverse structural members,
comprising of the appropriate structural items (23) to (25) as shown on diagram of typical transverse
section, Sheet 12 of this document.

2. Guidance for areas if measurement is indicated on the diagrams shown on Sheet 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-108 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-BC Report on Thickness of Cargo Hold Transverse Bulkheads

Ship’s name......................... Class identity No. ......................... Report No. .........................

LOCATION OF STRUCTURE: FRAME NO.:
STRUCTURAL COMPONENT (PLATING/STIFFENER)
Max.
Original
Alwb. Diminution Diminution
Thickness Gauged
Dim. P S
mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report form is to be used for recording the thickness measurement of cargo hold transverse
bulkheads.

2. Guidance for areas of measurement is indicated on the diagrams shown on Sheet 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-109

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 10
TM6-BC Report on Thickness measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
Description Thickness Gauged
Dim. P S
mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of miscellaneous structural
members including the structural items (28), (29) and (30) as shown on diagram of typical transverse
section, Sheet 12 of this document.

2. Guidance for areas of measurement is indicated on Sheet 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-110 Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 11
TM7-BC Report on Thickness Measurement of Cargo Hold Transverse Frames

Ship’s name......................... Class identity No. ......................... Report No. .........................

CARGO HOLD NO.
UPPER PART MID PART LOWER PART
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
FRAME Alwb. Gauged Alwb. Gauged Alwb. Gauged
Pt 1 Seagoing Ships

Thk. P S Thk. P S Thk. P S

NUMBER Dim. Dim. Dim.
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

Operators signature: .............................................
Notes:
B.13

Page B-111
1. This report is to be used for recording the thickness measurement of: Cargo hold transverse frames; Structural item number (34) as shown on the diagram of
 typical transverse section, Sheet 12 of this document.

2. Guidance for areas of measurement is indicated on the diagrams shown on Sheet 14 of this document. The single measurements recorded are to represent
the average of multiple measurements.

Page B-112
3. The location and pattern of measurements is to be indicated on the sketches of hold frames shown below.

4. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Typical transverse frames in cargo hold Non-typical transverse frames in cargo

Thickness gauging area (A) hold Thickness gauging area (A)
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

 Sheet 11(1)
TM7-BC S31 Report on Thickness Measurement of Cargo Hold Side Shell Frames

Ship’s name......................... Class identity No. ......................... Report No. .........................

CARGO HOLD NO.: Side.: (Port / stb.)
ZONE A ZONE B ZONE C ZONE D
Org. Org. Org. Org.
FRAME tREN tCOAT tM Diminution t tCOAT tM Diminution tREN tCOAT tM Diminution tREN tCOAT tM Diminution
Thk. Thk. REN Thk. Thk.
NO
Pt 1 Seagoing Ships

mm mm mm mm mm % mm mm mm mm mm % mm mm mm mm mm % mm mm mm mm mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

Operators signature: .............................................
Notes:

1. This report is to be used for recording the thickness measurement of: Cargo hold transverse frames for application of UR S31.

2. Guidance for areas of measurement is provided in Appendix 6 to this Chapter.

B.13

Page B-113
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I
3. The maximum allowable diminution could be stated in an attached document. B.13

Page B-114 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 12
Thickness measurement – Bulk Carriers
Typical Transverse Section Indicating Longitudinal and Transverse Members

Report on TM2-BC Report on TM3-BC Report on TM4-BC

1. Strength deck plating 8. Deck longitudinals 23. Double bottom tank floors
2. Stringer plate 9. Deck girders 24. Topside tank transverses
3. Sheer strake 10. Sheer strake longitudinals 25. Hopper side tank transverses
4. Side shell plating 11. Topside tank sloping plating 26.
12. Topside tank sloping plating
5. Bilge plating 27.
longitudinals
6. Bottom shell plating 13. Bottom longitudinals
Report on TM6-BC
7. Keel plate 14. Bilge girders
15. Bilge longitudinals 28. Hatch coamings
16. Side shell longitudinals 29. Deck plating between hatches
Report on TM7-BC
17. Inner bottom plating 30. Hatch covers
34. Hold frames or 18. Inner bottom longitudinals 31.
diaphragms 19. Hopper side plating 32.
20. Hopper side longitudinals 33.
21.
22.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-115

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 13
Thickness Measurement – Bulk Carriers: Typical Transverse Section Outline
To be used for longitudinal and transverse members where the typical bulk carrier section is not applicable

Report on TM2-BC Report on TM3-BC Report on TM4-BC

1. Strength deck plating 8. Deck longitudinals 23. Double bottom tank floors
2. Stringer plate 9. Deck girders 24. Topside tank transverses
3. Sheer strake 10. Sheer strake longitudinals 25. Hopper side tank transverses
4. Side shell plating 11. Topside tank sloping plating 26.
12. Topside tank sloping plating
5. Bilge plating 27.
longitudinals
6. Bottom shell plating 13. Bottom longitudinals
Report on TM6-BC
7. Keel plate 14. Bilge girders
15. Bilge longitudinals 28. Hatch coamings
16. Side shell longitudinals 29. Deck plating between hatches
Report on TM7-BC
17. Inner bottom plating 30. Hatch covers
34. Hold frames or 18. Inner bottom longitudinals 31. Inner bulkhead plating
diaphragms 19. Hopper side plating 32.
20. Hopper side longitudinals 33.
21.
22.

Page B-116 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 14
Close-up Survey and Thickness Measurement Areas

Thickness to be reported on TM3-BC, TM4-BC, TM6-BC and TM7-BC as appropriate

Biro Klasifikasi Indonesia - January 2025 Edition Page B-117

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

D. Recommended Procedures for Thickness Measurements of Double Hull Oil Tankers

Notes:
1. This document is to be used for recording thickness measurements as required by Section 4,I.E.
2. Reporting forms TM1-DHT, TM2-DHT, TM3-DHT, TM4-DHT, TM5-DHT and TM6-DHT (Sheets 4 to 10) are
to be used for recording thickness measurements and the maximum allowable diminution is to be stated.
The maximum allowable diminution could be stated in an attached document.
3. The remaining Sheets 11 to 15 are guidance diagrams and notes relating to the reporting forms and
the procedure for the thickness measurements.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:1)

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate.

Page B-118 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-DHT Report on Thickness Measurement of All Deck Plating, All Bottom Shell Plating or Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
Org. Forward Reading Aft Reading Mean Maximum
PLATE No. or
Thk. Diminution Diminution Diminution Diminution Diminution Allowable
POSITION Letter Gauged Gauged
mm P S P S % Diminution
P S mm % mm % P S mm % mm % P S mm
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

A— All strength deck plating within the cargo area.

B— All keel, bottom shell plating and bilge plating within the cargo area.
C— Side shell plating including selected wind and water strakes outside cargo area.
D— All wind and water strakes within cargo area.

2. The strake position is to be clearly indicated as follows:

1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate.
3. For side shell plating give number of the strake of plating below sheer strake and letter as shown
on shell expansion.
4. Measurements are to be taken at the forward and aft areas of all and where plates cross
ballast/cargo tank boundaries separate measurements for the area of plating in way of each
type of tank are to be recorded.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-119

 Sheet 5
TM2-DHT(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-120
STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Stringer
plate
1st strake
inboard
Annex B Annexes to Section 4-I

2nd
3rd
4th
Vol I Rules for Classification and Surveys

5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
Centre
strake
Sheer
strake
TOPSIDE
TOTAL

Operators signature: .............................................

Notes:
1. This report form is to be used for recording the thickness measurements of:

Strength deck plating and sheer strake plating transverse sections:

B.13

Biro Klasifikasi Indonesia - January 2025 Edition

One, two or three sections within the cargo area comprising of the structural items (0), (1) and (2) as shown on the diagrams of typical transverse sections
 illustrated on Sheets 11 and 12 of this document.

2. The topside area comprises deck plating, stringer plate and sheer strake (including rounded gunwales).

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.
Pt 1 Seagoing Ships

5. The maximum allowable diminution could be stated in an attached document.

Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-121
 Sheet 6
TM2-DHT(ii) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-122
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
1st below
sheer
strake
2nd
Annex B Annexes to Section 4-I

3rd
4th
5th
6th
Vol I Rules for Classification and Surveys

7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
keel strake
BOTTOM
TOTAL

Operators signature: .............................................

Notes:

1. This report form is to be used for recording the thickness measurements of:
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

Shell plating transverse sections:
 One, two or three sections within the cargo area comprising of the structural items (3), (4) and (5) and (6) as shown on the diagrams of typical transverse
sections illustrated on Sheets 11 and 12 of this document.

2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.
Pt 1 Seagoing Ships

5. The maximum allowable diminution could be stated in an attached document.

Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-123
 Sheet 7
TM3-DHT Report on Thickness Measurement of Longitudinal Members (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-124
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRUCTURAL Item Alwb. Gauged Item Alwb. Gauged Item Alwb. Gauged
Thk. P S Thk. P S Thk. P S
MEMBER No. Dim. No. Dim. No. Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurements of:
Longitudinal members at transverse sections:
One, two or three sections within the cargo area comprising of the appropriate structural items (10) to (29) as shown on the diagrams of typical transverse
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

sections illustrated on Sheets 11 and 12 of this document.
 2. The exact frame station of measurement is to be stated.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-125
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-DHT Report on Thickness Measurement of Transverse Structural Members
In the cargo oil and water ballast tanks within the cargo tank length

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL Thickness Gauged
ITEM Dim. P S
MEMBER mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurements of:

Transverse structural members, comprising of the appropriate structural items (30) to (36) as shown
on diagrams of typical transverse sections illustrated on Sheets 11 and 12 of this document.

2. Guidance for areas of measurement is indicated on Sheets 14 and 15 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-126 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-DHT Report on Thickness of W.T./O.T. Transverse Bulkheads
Within the cargo tank or cargo hold space

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK/HOLD DESCRIPTION:
LOCATION OF STRUCTURE: FRAME NO.:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL COMPONENT Thickness Gauged
Dim. P S
(PLATING/STIFFENER) mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of: W.T./O.T. transverse bulkheads

2. Guidance for areas of measurement is indicated on Sheet 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-127

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 10
TM6-DHT Report on Thickness measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:
Max.
Org.
Alwb. Diminution Diminution
Description Thk. Gauged
Dim. P S
mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

Miscellaneous structural members.

2. The single measurements recorded are to represent the average of multiple measurements.

3. The maximum allowable diminution could be stated in an attached document.

Page B-128 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 11
Thickness Measurement – Double Hull Oil Tankers
Typical Transverse Section of a Double Hull Tanker up to 150,000 dwt with Indication of Longitudinal and
Transverse Members

Report on TM2-DHT (i) & (ii) Report on TM3-DHT Report on TM4-DHT

20. Longitudinal
30. Deck transverse
0. Strength deck plating 10. Deck longitudinals bulkhead plating
(centre tank)
(remainder)
11. Sheer strake 21. Longitudinal 31. Deck transverse
1. Stringer plate
longitudinals bulkhead longitudinals (wing tank)
32. Vertical web in wing
2. Sheer strake 12. Side shell longitudinals 22. Inner side plating
ballast tank
23. Inner side 33. Double bottom
3. Side shell plating 13. Bilge longitudinals
longitudinals floor – wing tank
34. Double bottom
4. Bilge plating 14. Bottom longitudinals 24. Hopper plating
floor – centre tank
35. Longitudinal
5. Bottom shell plating 15. Deck girders 25. Hopper longitudinals
bulkhead vertical web
16. Horizontal girders in
6. Keel plate 26. Inner bottom plating 36. Cross ties
wing ballast tanks
27. Inner bottom
17. Bottom girders
longitudinals
18. Longitudinal bulkhead
28. Topside tank plating
top strake
19. Longitudinal bulkhead 29. Topside tank
bottom strake longitudinals

Biro Klasifikasi Indonesia - January 2025 Edition Page B-129

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 12
Thickness Measurement – Double Hull Oil Tankers
Typical Transverse Section of a Double Hull Tanker above 150,000 dwt with Indication of Longitudinal and
Transverse Members

Report on TM2-DHT (i) & (ii) Report on TM3-DHT Report on TM4-DHT

20. Longitudinal
30. Deck transverse
0. Strength deck plating 10. Deck longitudinals bulkhead plating
(centre tank)
(remainder)
11. Sheer strake 21. Longitudinal 31. Deck transverse
1. Stringer plate
longitudinals bulkhead longitudinals (wing tank)
32. Vertical web in wing
2. Sheer strake 12. Side shell longitudinals 22. Inner side plating
ballast tank
23. Inner side 33. Double bottom
3. Side shell plating 13. Bilge longitudinals
longitudinals floor – wing tank
34. Double bottom
4. Bilge plating 14. Bottom longitudinals 24. Hopper plating
floor – centre tank
35. Longitudinal
5. Bottom shell plating 15. Deck girders 25. Hopper longitudinals
bulkhead vertical web
16. Horizontal girders in
6. Keel plate 26. Inner bottom plating 36. Cross ties
wing ballast tanks
27. Inner bottom
17. Bottom girders
longitudinals
18. Longitudinal bulkhead
28. Topside tank plating
top strake
19. Longitudinal bulkhead 29. Topside tank
bottom strake longitudinals

Page B-130 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 13
Thickness Measurement – Double Hull Oil Tankers
Transverse Section Outline

The diagram may be used for those ships where the diagrams on Sheets 11 and 12 are not suitable.

Report on TM2-DHT (i) & (ii) Report on TM3-DHT Report on TM4-DHT

20. Longitudinal
30. Deck transverse
0. Strength deck plating 10. Deck longitudinals bulkhead plating
(centre tank)
(remainder)
11. Sheer strake 21. Longitudinal 31. Deck transverse
1. Stringer plate
longitudinals bulkhead longitudinals (wing tank)
32. Vertical web in wing
2. Sheer strake 12. Side shell longitudinals 22. Inner side plating
ballast tank
23. Inner side 33. Double bottom
3. Side shell plating 13. Bilge longitudinals
longitudinals floor – wing tank
34. Double bottom
4. Bilge plating 14. Bottom longitudinals 24. Hopper plating
floor – centre tank
35. Longitudinal
5. Bottom shell plating 15. Deck girders 25. Hopper longitudinals
bulkhead vertical web
16. Horizontal girders in
6. Keel plate 26. Inner bottom plating 36. Cross ties
wing ballast tanks
27. Inner bottom
17. Bottom girders
longitudinals
18. Longitudinal bulkhead
28. Topside tank plating
top strake
19. Longitudinal bulkhead 29. Topside tank
bottom strake longitudinals

Biro Klasifikasi Indonesia - January 2025 Edition Page B-131

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 14
Thickness Measurement – Double Hull Oil Tankers
Areas subject to close-up survey and thickness measurements - Thickness to be reported on TM3-DHT,
TM4-DHT and TM5-DHT as appropriate

Page B-132 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 15
Thickness Measurement – Double Hull Oil Tankers
Areas subject to close-up survey and thickness measurements - Thickness to be reported on TM3-DHT
and TM4-DHT as appropriate

Biro Klasifikasi Indonesia - January 2025 Edition Page B-133

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

E. Recommended Procedures for Thickness Measurements of Double Skin Bulk Carriers

Notes:
1. This document is to be used for recording thickness measurements as required by Section 4-I.E.
2. Reporting forms TM1-DSBC, TM2-DSBC, TM3-DSBC, TM4-DSBC, TM5-DSBC and TM6-DSBC (Sheets 4 to
10) are to be used for recording thickness measurements and the maximum allowable diminution should
be stated.
The maximum allowable diminution could be stated in an attached document.
3. The remaining Sheets 11 to 14 are guidance diagrams and notes relating to the reporting forms and
the procedure for the thickness measurements as required by IACS Unified Requirement.

GENERAL PARTICULARS
Ship’s name:
IMO number:
Class identity number:
Port of registry:
Gross tons:
Deadweight:
Date of build:
Classification society:

Name of Company performing thickness measurement:

Thickness measurement company certified by:
Certificate No:
Certificate valid from..................to................
Place of measurement:
First date of measurement:
Last date of measurement:

Renewal survey/intermediate survey due:1)

Details of measurement equipment:
Qualification of operators:

Report number: consisting of Sheets

Name of operator: Name of surveyor:

Signature of operator: Signature of surveyor:
Company official stamp: Classification society official stamp:

* Delete as appropriate.

Page B-134 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 4
TM1-DSBC Report on Thickness Measurement of All Deck Plating, All Bottom Shell Plating or Side Shell Plating*
(*delete as appropriate)

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRAKE
POSITION
Org. Forward Reading Aft Reading Mean Maximum
PLATE No. or
Thk. Diminution Diminution Diminution Diminution Diminution Allowable
POSITION Letter Gauged Gauged
mm P S P S % Diminution
P S mm % mm % P S mm % mm % P S mm
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurement of:
A— All strength deck plating within the cargo area.
B— All keel, bottom shell plating and bilge plating within the cargo area.
C— Side shell plating including selected wind and water strakes outside cargo length area.
D— All wind and water strakes within cargo area.
2. The strake position is to be clearly indicated as follows:
1. For strength deck indicate the number of the strake of plating inboard from the stringer plate.
2. For bottom plating indicate the number of the strake of plating outboard from the keel plate.
3. For side shell plating give number of the strake of plating below sheer strake and letter as shown
on shell expansion.
3. Only the deck plating strakes outside line of openings are to be recorded.
4. Measurements are to be taken at the forward and aft areas of all plates and where plates cross
ballast/cargo tank boundaries separate measurements for the area of plating in way of each type
of tank are to be recorded.
5. The single measurements recorded are to represent the average of multiple measurements.
6. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-135

 Sheet 5
TM2-DSBC(i) Report on Thickness Measurement of Shell and Deck Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-136
STRENGTH DECK AND SHEERSTRAKE PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRAKE No. or Alwb. Gauged No. or Alwb. Gauged No. or Alwb. Gauged
Thk. P S Thk. P S Thk. P S
POSITION Letter Dim. Letter Dim. Letter Dim.
Pt 1 Seagoing Ships

mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Stringer
plate
1st strake
inboard
Annex B Annexes to Section 4-I

2nd
3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
Centre
strake
Sheer
strake
TOPSIDE
TOTAL

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

Strength deck plating and sheer strake plating transverse sections:

B.13

Biro Klasifikasi Indonesia - January 2025 Edition

One, two or three sections within the cargo length area, comprising the structural items (0), (1) and (2) as shown on the diagrams of typical transverse sections
 illustrated on Sheets 11, 12 and 13 of this document.

2. Only the deck plating strakes outside line of hatch openings are to be recorded.

3. The top side area comprises deck plating, stringer plate and sheer strake (including rounded gunwales).

4. The exact frame station of measurement is to be stated.

Pt 1 Seagoing Ships

5. The single measurements recorded are to represent the average of multiple measurements.

6. The maximum allowable diminution could be stated in an attached document.

Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-137
 Sheet 6
TM2-DSBC(ii) Report on Thickness Measurement of Shell Plating (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-138
SHELL PLATING
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
As Vol. Gauged As Vol. Gauged As Vol.
No. Ren. Remaining Corr. No. Ren. Remaining Corr. No. Ren. Gauged Remaining Corr.
Built Thk. Thk. Built Thk. Thk. Built Thk.
STRAKE or Thk. Addition, mm or Thk. Addition, mm or Thk. Thk. mm Addition, mm
Thk. Add. mm Thk. Add. mm Thk. Add.
POSITION Letter mm (a) (b)-(a) Letter mm (a) (b)-(a) Letter mm (a) (b) (b)-(a)
Pt 1 Seagoing Ships

mm mm (b) mm mm (b) mm mm
P S P S P S P S P S P S
1st below
sheer
strake
Annex B Annexes to Section 4-I

2nd
3rd
4th
5th
Vol I Rules for Classification and Surveys

6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
Keel strake
BOTTOM
TOTAL

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurement of:
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

Shell plating at transverse sections:
 One, two or three sections within the cargo length area, comprising the structural items (3), (4), (5) and (6) as shown on the diagrams of typical transverse
sections illustrated on Sheets 11, 12 and 13 of this document.

2. The bottom area comprises keel, bottom and bilge plating.

3. The exact frame station of measurement is to be stated.

4. The single measurements recorded are to represent the average of multiple measurements.
Pt 1 Seagoing Ships

5. The maximum allowable diminution could be stated in an attached document.

Annex B Annexes to Section 4-I
Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-139
 Sheet 7
TM3-DSBC Report on Thickness Measurement of Longitudinal Members at Transverse Sections (one, two or three transverse sections)

Ship’s name......................... Class identity No. ......................... Report No. .........................

Page B-140
FIRST TRANSVERSE SECTION AT FRAME NUMBER SECOND TRANSVERSE SECTION AT FRAME NUMBER THIRD TRANSVERSE SECTION AT FRAME NUMBER
Max. Max. Max.
Org. Diminution Diminution Org. Diminution Diminution Org. Diminution Diminution
STRUCTURAL Item Alwb. Gauged Item Alwb. Gauged Item Alwb. Gauged
Thk. P S Thk. P S Thk. P S
MEMBER No. Dim. No. Dim. No. Dim.
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Operators signature: .............................................

Notes:
1. This report is to be used for recording the thickness measurements of:

Longitudinal members at transverse sections:

One, two or three sections within the cargo length area comprising the appropriate structural items (10) to (25) as shown on diagrams of typical transverse
B.13

Biro Klasifikasi Indonesia - January 2025 Edition

sections illustrated on Sheets 11, 12 and 13 of this document.
 2. The exact frame station of measurement is to be stated.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Pt 1 Seagoing Ships

Annex B Annexes to Section 4-I

Vol I Rules for Classification and Surveys

Biro Klasifikasi Indonesia - January 2025 Edition

B.13

Page B-141
Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 8
TM4-DSBC Report on Thickness Measurement of Transverse Structural Members
In the double bottom, hopper side and topside water ballast tanks

Ship’s name......................... Class identity No. ......................... Report No. .........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE:
Max.
Original
Alwb. Diminution Diminution
STRUCTURAL Thickness Gauged
ITEM Dim. P S
MEMBER mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurements of:

Transverse structural members, comprising the appropriate structural items (30) to (34) as shown on
diagrams of typical transverse sections illustrated on Sheets 11, 12 and 13 of this document.

2. Guidance for areas of measurement is indicated on Sheets 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-142 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 9
TM5-DSBC Report on Thickness of Watertight Transverse Bulkheads in Cargo Holds

Ship’s name......................... Class identity No. ......................... Report No. .........................

LOCATION OF STRUCTURE: FRAME NO.:
STRUCTURAL COMPONENT (PLATING/STIFFENER)
Max.
Original
Alwb. Diminution Diminution
Thickness Gauged
Dim. P S
mm
mm
Port Starboard mm % mm %

Operators signature: .............................................

Notes:

1. This report form is to be used for recording the thickness measurement of:

2. W.T. transverse bulkheads in cargo holds.

3. Guidance for areas of measurements is indicated on Sheet 14 of this document.

4. The single measurements recorded are to represent the average of multiple measurements.

5. The maximum allowable diminution could be stated in an attached document.

Biro Klasifikasi Indonesia - January 2025 Edition Page B-143

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 10
TM6-DSBC Report on Thickness measurement of Miscellaneous Structural Members

Ship’s name......................... Class identity No. ......................... Report No. .........................

STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:
Max.
Org.
Alwb. Diminution Diminution
Description Thk. Gauged
Dim. P S
mm
mm
P S mm % mm %

Operators signature: .............................................

Notes:

1. This report is to be used for recording the thickness measurement of:

Miscellaneous structural members including the structural items (40), (41) and (42) as shown on
diagrams of typical transverse sections illustrated on Sheets 11, 12 and 13 of this document.

2. Guidance for areas of measurement is indicated on Sheet 14 of this document.

3. The single measurements recorded are to represent the average of multiple measurements.

4. The maximum allowable diminution could be stated in an attached document.

Page B-144 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 11
Thickness Measurement – Double Skin Bulk Carriers
Typical Transverse Section of a Double Skin Bulk Carrier with Indication of Longitudinal and Transverse
Members

Report on TM2-DSBC(i) & (ii) 18. Inner bottom longitudinals

1. Strength deck plating 19. Hopper plating
2. Stringer plate 20. Hopper longitudinals
3. Sheer strake 31. Inner side plating
4. Side shell plating – Inner side longitudinals, if any
5. Bilge plating – Horizontal girders in wing ballast tanks
6. Bottom shell plating
7. Keel plate
Report on TM4-DSBC
23. Double bottom tank floors
Report on TM3-DSBC 25. Hopper side tank transverses
8. Deck longitudinals 34. Transverse web frame
9. Deck girders – Topside tank transverses
10. Sheer strake longitudinals
11. Topside tank sloping plating
12. Topside tank sloping plating longitudinals Report on TM6-DSBC
13. Bottom longitudinals 28. Hatch coamings
14. Bottom girders – Deck plating between hatches
15. Bilge longitudinals – Hatch covers
16. Side shell longitudinals, if any
17. Inner bottom plating

Biro Klasifikasi Indonesia - January 2025 Edition Page B-145

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 12
Thickness Measurement – Double Skin Bulk Carriers
Typical Transverse Section of an Ore Carrier with Indication of Longitudinal and Transverse Members

Report on TM2-DSBC(i) & (ii) Report on TM4-DSBC

1. Strength deck plating 25. Deck transverse (centre tank)
2. Stringer plate 26. Bottom transverse (centre tank)
3. Sheer strake 27. Deck transverse (wing tank)
4. Side shell plating 28. Side shell vertical web
5. Bilge plating 29. Longitudinal bulkhead vertical web
6. Bottom shell plating 30. Bottom transverse (wing tank)
7. Keel plate 31. Struts
32. Transverse web face plate
33. D.B. floors
34.
35
Report on TM3-DSBC Report on TM6-DSBC
8. Deck longitudinals 36. Hatch coamings
9. Deck girders 37. Deck plating between hatches
10. Sheer strake longitudinals 38. Hatch covers
11. Longitudinal bulkhead top strake 39.
12. Bottom longitudinals 40
13. Bottom girders
14. Bilge longitudinals
15. Longitudinal bulkhead lower strake
16. Side shell longitudinals
17. Longitudinal bulkhead plating (remainder)
18. Longitudinal bulkhead longitudinals
19. Inner bottom plating
20. Inner bottom longitudinals
21.
22
23
24

Page B-146 Biro Klasifikasi Indonesia - January 2025 Edition

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 13
Thickness Measurement – Double Skin Bulk Carriers
Transverse section outline: The diagram may be used for those ships where the diagrams on Sheets 11
and 12 are not suitable.

Report on TM2-DSBC(i) & (ii) 17. Inner bottom plating

1. Strength deck plating 18. Inner bottom longitudinals
2. Stringer plate 19. Hopper plating
3. Sheer strake 20. Hopper longitudinals
4. Side shell plating 31. Inner side plating
5. Bilge plating – Inner side longitudinals, if any
6. Bottom shell plating – Horizontal girders in wing ballast tanks
7. Keel plate
Report on TM4-DSBC
23. Double bottom tank floors
25. Hopper side tank transverses
Report on TM3-DSBC 34. Transverse web frame
8. Deck longitudinals – Topside tank transverses
9. Deck girders
10. Sheer strake longitudinals
11. Topside tank sloping plating Report on TM6-DSBC
12. Topside tank sloping plating longitudinals 28. Hatch coamings
13. Bottom longitudinals – Deck plating between hatches
14. Bottom girders – Hatch covers
15. Bilge longitudinals
16. Side shell longitudinals, if any

Biro Klasifikasi Indonesia - January 2025 Edition Page B-147

Pt 1 Seagoing Ships
Vol I Rules for Classification and Surveys
Annex B Annexes to Section 4-I B.13

Sheet 14
Thickness Measurement – Ore Carriers
Areas Subject to Close up Survey and Thickness Measurements - Thickness to be Reported on TM3-DSBC,
TM4-DSBC, TM5-DSBC and TM6-DSBC as appropriate

Page B-148 Biro Klasifikasi Indonesia - January 2025 Edition