Notices and General Information

RULES FOR BUILDING AND CLASSING

MOBILE OFFSHORE DRILLING UNITS

2018

NOTICES AND
GENERAL INFORMATION

American Bureau of Shipping

Incorporated by Act of Legislature of
the State of New York 1862

 2017 American Bureau of Shipping. All rights reserved.

ABS Plaza
16855 Northchase Drive
Houston, TX 77060 USA
part
T a b l e o f C o n t e n t s

Notices and General Information

CONTENTS
Introduction ..................................................................................................................... 1
TABLE 1 Applicable Editions of Booklets Comprising 2018 Rules ..........2
TABLE 2 Division and Numbering of Rules..............................................2
Rule Change Notice (2018) ............................................................................................. 3
TABLE 3 Summary of Changes from the 2017 Rules ..............................3

ii ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018
Notices and General Information

Introduction
1. The year 2018 edition of the Rules for Building and Classing Mobile Offshore Drilling Units
consists of the nine (9) booklets as shown in Table 1.
The purpose of the generic title ABS Rules for Conditions of Classification – Offshore Units and
Structures (Part 1) is to reflect the expanded contents of PART 1, as a result of including
consolidated requirements for “Classification” applicable to all types of offshore units, pipelines,
risers, and other offshore structures, as specified in the Foreword to Part 1.
With regard to Part 2, the purpose of the generic title ABS Rules for Materials and Welding is to
emphasize the common applicability of the requirements to ABS-classed vessels, other marine
structures and their associated machinery, and thereby make PART 2 more readily a common
“PART” of various ABS Rules and Guides, as appropriate.
2. The numbering system applied in the Rules is shown in Table 2.
3. The primary changes from the 2017 edition of the Rules are identified and listed in Table 3. The
effective date of the indicated Rule Changes is 1 January 2018, unless specifically indicated otherwise.
4. The effective date of each technical change since 1993 is shown in parenthesis at the end of the
subsection/paragraph titles within the text of each Part. Unless a particular date and month are
shown, the years in parentheses refer to the following effective dates:

(2000) and after 1 January 2000 (and subsequent years) (1996) 9 May 1996
(1999) 12 May 1999 (1995) 15 May 1995
(1998) 13 May 1998 (1994) 9 May 1994
(1997) 19 May 1997 (1993) 11 May 1993

For certain changes that have a major impact on shipyards, designers and vendors, ABS has
instituted a two-year Rule cycle to give the industry more time to prepare for these changes. The
text of these changes will appear in a box along with the effective date just under the existing Rule
requirement.

5. Until the next edition of the Rules for Building and Classing Mobile Offshore Drilling Units is
published, Rule Change Notices and/or Corrigenda, as necessary, will be published on the ABS
website – www. eagle.org – only, and will be available free for downloading. It is not intended to
publish hard copies of future Rule Change Notices and/or Corrigenda to existing Rules or Guides.
The consolidated edition of the Rules for Building and Classing Mobile Offshore Drilling Units,
which includes Rule Change Notices and/or Corrigenda using different colors for easy recognition
will be published on the ABS website only when RCN and/or Corrigenda are issued.
6. The listing of CLASSIFICATION SYMBOLS AND NOTATIONS is available from the ABS
website www.eagle.org for download.

ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018 1
Notices and General Information

TABLE 1
Applicable Editions of Booklets Comprising 2018 Rules
Notices and General Information 2018
Part 1: Rules for Conditions of Classification – Offshore Units and 2018 (2)
Structures (1)
Part 1: Conditions of Classification (Supplement to the ABS Rules for 2018
Conditions of Classification – Offshore Units and Structures) (1)
Part 2: Rules for Materials and Welding 2018 (2)
Part 3: Hull Construction and Equipment 2018
Part 4: Machinery and Systems 2018
Part 5: Fire and Safety – Measures and Features 2018
Part 6: Rules for Equipment and Machinery Certification 2018
Part 7: Surveys 2018
Notes:
1 The requirements for conditions of classification are contained in the separate, generic ABS Rules for Conditions
of Classification – Offshore Units and Structures (Part 1). Additional specific requirements are contained in Part 1
of these Rules.
2 The latest edition of these Rules is to be referred to. These Rules may be downloaded from the ABS website at
www.eagle.org, Rules and Guides, Downloads or may be ordered separately from the ABS Publications online
catalog at www.eagle.org, Rules and Guides, Catalog.

TABLE 2
Division and Numbering of Rules
Division Number
Part Part 1
Chapter Part 1, Chapter 1
Section Section 1-1-1
Subsection (see Note 1) 1-1-1/1
Paragraph (see Note 1) 1-1-1/1.1
Subparagraph 1-1-1/1.1.1
Item 1-1-1/1.1.1(a)
Subitem 1-1-1/1.1.1(a)i)
Appendix Appendix 1-1-A1 or Appendix 1-A1-1
Note:
1 An odd number (1, 3, 5, etc.) numbering system is used for the Rules. The purpose is to permit future insertions of
even-numbered paragraphs (2, 4, 6, etc.) of text and to avoid the necessity of having to renumber the existing text
and associated cross-references, as applicable, within the Rules and associated process instructions, check sheets,
etc.

2 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018
Notices and General Information

Rule Change Notice (2018)

TABLE 3
Summary of Changes from the 2017 Rules

EFFECTIVE DATE 1 March 2017 – shown as (1 March 2017)

Part/Para. No. Title/Subject Status/Remarks

PART 1 Rules for Conditions of Classification – Offshore Units and Structures
1-1-1/7 Scope of Classification To align with the other sections of Part 1 regarding disclaimers of
liability for the responsibilities of vessel owners/operators in this
article.
1-1-7/7 Submission of Plans To align ABS plan submittal process with our legal duty to protect
client and third party intellectual property rights.

EFFECTIVE DATE 1 May 2017 – shown as (1 May 2017)

Part/Para. No. Title/Subject Status/Remarks

PART 1 Rules for Conditions of Classification – Offshore Units and Structures
1-1-4/3.1 Effective Date To remove the application of the six-month rules for Guides, which
are meant for immediate implementation. (Incorporates Notice No. 2)

EFFECTIVE DATE 1 January 2018 – shown as (2018)

Part/Para. No. Title/Subject Status/Remarks

PART 1 Rules for Conditions of Classification – Offshore Units and Structures
1-1-A2/5.1.5 Duplicate Product Design To clarify ABS policy for PDA-DUP issuance, confirmed by ABS
Assessment Programs.

EFFECTIVE DATE 1 October 2017 – shown as (1 October 2017)

Part/Para. No. Title/Subject Status/Remarks

PART 1 Conditions of Classification (Supplement to the ABS Rules for Conditions of Classification
– Offshore Units and Structures)
1-1-5/1.17 <No Title> To require verification that there is a procedure in place for confirming
(New) engagement and full disengagement status of fixation system.
(Incorporates Notice No. 2)

EFFECTIVE DATE 1 January 2018 – shown as (2018)

Part/Para. No. Title/Subject Status/Remarks

PART 1 Conditions of Classification (Supplement to the ABS Rules for Conditions of Classification
– Offshore Units and Structures)
1-1-5/1.17 <No Title> To clarify that the requirement is only applicable where a fixation
system is used.

ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018 3
Notices and General Information

EFFECTIVE DATE 1 July 2017 – shown as (1 July 2017)

(based on the contract date for new construction between builder and Owner)
Part/Para. No. Title/Subject Status/Remarks
PART 3 Hull Construction and Equipment
3-2-1/1 Structural Analysis To specify that the LRFD structural design criteria in the Guide for
Load and Resistance Factor Design (LRFD) Criteria for Offshore
Structures can be used as an alternative to those affected criteria in
Part 3 of the MODU Rules, where the criteria are presented in the
Working Stress Design (WSD) format. (Incorporates Notice No. 1)
PART 4 Machinery and Systems
4-2-1/11.29 Flexible Hoses To align the requirements with 4-6-2/5.7 of the Rules for Building and
Classing Steel Vessels. (Incorporates Notice No. 1)
4-3-2/7.9 Harmonics To specify that the harmonic distortion calculation report is to be kept
on board for exceptions to the 8% limit in cases where all installed
equipment and systems have been designed for higher THD levels, in
line with IACS UR E24 June 2016. (Incorporates Notice No. 1)
4-3-2/9.18 Harmonic Distortion for Ship To introduce requirements for survey of harmonic filters and harmonic
(New) Electrical Distribution System distortion levels, in line with IACS UR E24 June 2016. (Incorporates
including Harmonic Filters Notice No. 1)
4-3-2/9.19 Protection of Harmonic Filter Circuits To introduce requirements for survey of harmonic filters and harmonic
Associated with Electric Propulsion distortion levels, in line with IACS UR E24 June 2016. (Incorporates
Notice No. 1)
4-3-4/7.1.1 General To identify the standards that have been withdrawn or replaced by
new ones and to consider approaches for cables not manufactured to
IEC standards identified, in line with IACS UR E7 Rev.4 Apr. 2016.
(Incorporates Notice No. 1)

EFFECTIVE DATE 1 October 2017 – shown as (1 October 2017)

(based on the contract date for new construction between builder and Owner)
Part/Para. No. Title/Subject Status/Remarks
PART 6 Material, Marine Equipment and Machinery Certification
6-1-9/19 Control, Monitoring and Alarm To relocate the fixation system engagement/disengagement requirement
System to within 6-1-9/19 and to remove interlock requirements.
(Incorporates Notice No. 2)

EFFECTIVE DATE 1 January 2018 – shown as (2018)

(based on the contract date for new construction between builder and Owner)
Part/Para. No. Title/Subject Status/Remarks
PART 3 Hull Construction and Equipment
3-1-2/1 Hull and Design Data To specify that a Fiber Reinforced Plastic (FRP) layout drawing is to
be submitted.
3-1-4/3.3 Extra High Strength Steel To align the requirements with the latest IACS UR W16.
3-1-4/5.5 Selection Criteria for ABS Grades of To align the requirements with the latest IACS UR W16.
Steel
3-1-4/5.7.4 Extra High Strength Steels To align the requirements with the latest IACS UR W16.
3-1-4/Table 2 Material Selection for ABS Extra To align the requirements with the latest IACS UR W16.
(New) High Strength Steel Grades
3-1-A3 Material Selection for ABS Grades of To consolidate material requirements in the Rules for Materials and
(Deleted) High Strength Quenched and Welding (Appendix 3-1-A3 was relocated to Section 2-1-8 of the
Tempered Steel Rules for Materials and Welding).
3-2-2/1.5 Protection of Steel Work To clarify the requirements of corrosion protection of steel.

4 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018
Notices and General Information

Part/Para. No. Title/Subject Status/Remarks

3-2-2/3.3.5 Bolted Connections To specify requirements for bolted connections on helidecks.
(New)
3-2-3/3.1.3 Secondary Application Structures To be consistent with 3-2-5/Figure 1.
(Least Critical)
3-2-4/1.7.3 Secondary Application Structures To be consistent with 3-2-5/Figure 1.
(Least Critical)
3-2-4/15 Higher-strength Materials To align the requirements with 3-2-3/7.1 of the Steel Vessel Rules for
higher-strength material to allow reduced plate thickness.
3-2-5/3.5.2 Secondary Application Structures To be consistent with 3-2-5/Figure 1.
3-3-2/5.3 Watertight Integrity To align the requirements with the IMO MODU Code.
3-3-2/5.3.1 Internal Openings Used for Access To align the requirements with the IMO MODU Code.
While Afloat
3-3-2/5.3.1(b) <No Title> To align the requirements with the IMO MODU Code.
3-3-2/5.3.2 Internal Openings Permanently Closed To align the requirements with the IMO MODU Code.
While Afloat
3-3-2/5.3.4 External Openings Permanently To align the requirements with the IMO MODU Code.
Closed While Afloat
3-3-A2 (Title) Computer Software for Onboard To align the Rules with IACS UR L5, Revision 3.
Stability Calculations
3-3-A2/5 Types of Stability Software To align the Rules with IACS UR L5, Revision 3.
3-3-A2/7.1 Calculation Program To align the Rules with IACS UR L5, Revision 3.
3-3-A2/7.5 Warning To align the Rules with IACS UR L5, Revision 3.
3-3-A2/7.15 Computer Model To align the Rules with IACS UR L5, Revision 3.
(New)
3-3-A2/7.17 Further Requirements for Type 4 To align the Rules with IACS UR L5, Revision 3.
(New) Stability Software
3-3-A2/9 Acceptable Tolerances To align the Rules with IACS UR L5, Revision 3.
3-3-A2/Table 1 Acceptable Tolerances To align the Rules with IACS UR L5, Revision 3.
3-3-A2/11.1 Conditions of Approval of the To align the Rules with IACS UR L5, Revision 3.
Onboard Software for Stability
Calculations
3-3-A2/11.5 Specific Approval To align the Rules with IACS UR L5, Revision 3.
3-4-1/17.1 General To relocate the requirements for the anchor windlass to Part 6.
PART 4 Machinery and Systems
4-1-2/3.1.2 Piping Arrangement To align the requirements with the Steel Vessel Rules.
4-2-3/1.9.3 Protection for Fuel Oil and To clarify that the requirement is not applicable to emergency
Lubricating Oil Tanks services.
4-2-4/9.3.1 Main Line To remove reference to formula that is not required by the IMO
MODU and IACS UR D9.6.2.
4-2-5/13 Class Notation – POT To clarify that the protection requirements for lubrication oil tanks as
required in 4-2-5/11 are not applicable to lubrication oil tanks with a
capacity not greater than 30 m3.
4-2-6/1.3 Sight Flow Glasses To align the requirements with the Steel Vessel Rules.
4-2-6/3.11 Accumulators To refer to the Steel Vessel Rules requirements for hydraulic systems.
4-2-6/5.3.2 Ventilation of Storage Room To clarify that the requirements are applied to acetylene gas (as
flammable gas) only.
4-2-6/5.3.3 Electrical Installation in Storage To clarify that the requirements are applied to acetylene gas (as
Room flammable gas) only.
4-2-6/5.5.4 Gas Cylinders To clarify that the requirements are applied to acetylene gas (as
flammable gas) only.

ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018 5
Notices and General Information

Part/Para. No. Title/Subject Status/Remarks

4-2-6/13.5 Storage and Use of SCR Reductants To provide requirements for Selective Catalytic Reduction (SCR)
(New) systems, in line with IACS UR M77 Sept. 2016.
4-2-6/17 Helicopter Deck Drainage To align the requirements with the Steel Vessel Rules and the IMO
Arrangements MODU Code.
4-3-3/1.5 Electrical Equipment in Hazardous To include the electrical equipment operable after shutdown that is
Areas required to be rated for hazardous areas.
4-3-3/3.25 Receptacles and Plugs of Different To permit receptacles in hazardous areas, in line with 8.11.1 of IEC
Ratings Std. 61892-7.
4-3-3/Table 1 Minimum Degree of Protection To permit plugs and socket outlets installed in hazardous areas, in line
with IEC 61892-7 Para. 8.11.1 and IEC 60079-14 Para. 5.13.
4-3-5/1.3.5 Earth Fault Detection and Indication To clarify the requirements for audible and visual indication of earth
faults for high voltage systems.
PART 5 Fire and Safety – Measures and Features
5-1-1/3.17ii) <No Title> To align the requirements with 9.2.9 of the IMO MODU Code.
5-1-1/33 <No Title> To align the requirements with 9.3.17 of the IMO MODU Code.
5-1-1/Figure 1 Pipes Penetrating “A” Class Divisions To add PVC material, in line with SOLAS Chapter II-2 Regulation 9.3.
5-1-1/Figure 2 Pipes Penetrating “B” Class Divisions To add PVC material, in line with SOLAS Chapter II-2 Regulation 9.3.
5-1-1/Figure 4 Ventilation Ducts Penetrating “B” To align the requirements with 9.3.17 of the IMO MODU Code.
Class Divisions
5-2-3/1.3.1 Fixed Fire Extinguishing Systems on To require that the closed moonpool area is also to be protected for
Drilling Area and Temporary Well firefighting at the same level as the drillfloor.
Test Area, and Moonpool Area
5-2-3/3.1.2 Design To provide a clear instruction for the pressure rating of the distribution
pipe.
5-2-3/9.1 General To specify provisions for the use of aluminum helidecks.
5-2-4/Table 2 Hand Portable Fire Extinguishers and To align the requirements with Table 9-3 of IMO MODU Code 2009
Semi-portable Fire-Extinguishing (refer to MSC.1/Circ.1275).
Systems
5-2-5/1.1.2 Machinery Spaces To align the requirements with ABS practice.
5-2-5/5.3 Alarms To clarify the requirements and to specify that “the high level alarm”
should immediately activate the toxic alarm without waiting for
crew’s acknowledge at the main control panel.
5-3-1/3 Means of Access and Egress To clarify the requirements for aluminum helideck escape stairs and
intermediate platforms.
5-3-1/9.9 Floor Plating in Machinery Spaces of To specify that FRP is not allowed in machinery spaces of Category
Category A A.
PART 6 Material, Marine Equipment and Machinery Certification
6-1-5/1.1 Application To clarify the requirements for accumulators of extruded seamless
construction.
6-1-6/7.3.2 Survey and Certification of Pumps To clarify that raw water pumps and booster pumps are to be certified
when part of the fire system, and to include certification of pumps for
non-self-propelled DPS units.
6-1-7/9.9.6(b) Alternative To include IEC 61439-2 for power switchgear and control gear
assemblies.
6-1-7/Table 7 Clearance and Creepage Distance for To align the requirement with IEC 60092-302 and IEC 61892-3.
Switchboards, Distribution Boards,
Chargers, Motor Control Centers and
Controllers
6-1-7/Table 8 Equipment and Instrumentation for To provide a reference to the requirements for high voltage systems.
Switchboard

6 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018
Notices and General Information

Part/Para. No. Title/Subject Status/Remarks

6-1-9/19 Control, Monitoring and Alarm To specify interlock override requirements for designs that incorporate
System an interlock system between jacking operations and a rack fixation
system engagement.
6-1-9/25.5 Replacement Jacking Equipment for To require that all replacement parts be manufactured in accordance
(New) Units in Operation with the original or subsequently ABS approved/accepted designs.
6-1-10/1 General To relocate the requirements for the anchor windlass to Part 6.

ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018 7
Notices and General Information

The reference date which is indicated in the parentheses following the title of the requirement in this Part is the date
that the requirement becomes effective [e.g., 7-1-2/23.9 “Air Testing” (2018) is to apply for vessels undergoing
survey on or after 1 January 2018].

EFFECTIVE DATE 1 July 2017 – shown as (2017)

Part/Para. No. Title/Subject Status/Remarks

PART 7 Surveys
7-2-1/7.9 Prompt and Thorough Repairs To provide guidance for Surveyors on how to deal with required repairs
(New) found during surveys. (Incorporates Notice No. 1)
7-2-5/13.15 Self-Elevating Drilling Units – Leg To add requirements for pin and yoke type jacking systems and to
Jacking Systems reference the new Guide for Survey and Inspection of Jacking Systems.
(Incorporates Notice No. 1)
7-2-5/15.3.1 DP Thrusters To clarify that the requirements are not applicable to only retractable
thrusters and to establish minimum CM requirements for DP thrusters.
(Incorporates Notice No. 1)
7-2-6/1.5 Self-Elevating Units To specify the requirements for visual examination and NDE of leg-
to-spudcan connections. (Incorporates Notice No. 1)
7-2-A2/3 Survey of Portable Accommodation To specify the application dates of the Guide for Portable
Modules Accommodation Modules. (Incorporates Notice No. 1)
7-2-A2/5xiii) <No Title> To clarify the application of the hazardous area requirements.
(Incorporates Notice No. 1)

EFFECTIVE DATE 1 January 2018 – shown as (2018)

Part/Para. No. Title/Subject Status/Remarks

PART 7 Surveys
7-1-2/23.1.1 Types and Definition of Test To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.9 Air Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
and IACS UR S14 Rev.5, as applicable.
7-1-2/23.11 Hose Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
and IACS UR S14 Rev.5, as applicable.
7-1-2/23.15 Compressed Air Fillet Weld Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.17 Vacuum Box Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.19 Ultrasonic Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.21 Penetration Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.23 Hydropneumatic Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.25 Other Methods of Testing To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/23.27 Application of Coating To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and IACS UR S14 Rev.5, as applicable.
7-1-2/Table 3 Application of Leak Testing, Coating To align the requirements with Section 3-7-1 of the Steel Vessel Rules
(New) and Provision of Safe Access for and IACS UR S14 Rev.5, as applicable.
Type of Welded Joints
7-1-2/27 Hull Inspection and Maintenance To provide references to the ABS Guide for Hull Inspection and
Program (HIMP) (Optional) Maintenance Program and HIMP survey requirements

8 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018
Notices and General Information

Part/Para. No. Title/Subject Status/Remarks

7-1-3/3vi) Survey of Machinery, Piping, Pressure To align with 4-6-2/7.1 of the Steel Vessel Rules.
Vessels, and other Outfitting Items
7-1-8/15.1 Hydrogen Sulfide (H2S) Detection To align with 2009 MODU Code Chapter 9 Paragraph 9.12.1 and
and Alarm System 5-2-5/5.3 of the ABS MODU Rules and IACS UR D11.8.2.
7-2-1/1.1 Chapter 2 Sections 1 through 11 To advise that current survey Rules are applied to all vessels after
construction.
7-2-3/1.1 Plan for UWILD To require the attending Surveyor review the UWILD plan prior to
submitting to ACS Office.
7-2-3/1.5 Survey Planning Document (SPD) To specify survey requirements for spud can leg to can connections.
7-2-4/1.1.15 HIMP Notation To specify HIMP survey requirements.
7-2-4/3.4 Drilling Units To specify survey requirements for air intake shut off arrangements for
(New) internal combustion engines.
7-2-5/1.13 Alternatives To require the attending Surveyor review the alternative means plan
prior to submitting to ACS Office.
7-2-5/1.15 HIMP Notation To specify HIMP survey requirements.
(New)
7-2-5/5.1.6 Lightship Displacement To align with the 2009 MODU Code, which allows placement of the
weight difference in an indisputably conservative center of gravity.
7-2-5/7.1.1vi) Spud Cans or Mats To align the requirements with current practice, whereby examination of
all parts below the waterline (submerged parts of the leg structure to
spud can connections) are postponed until the next rig move.
7-2-5/7.3.1 General Visual Inspection (GVI) To require the attending Surveyor review the alternative means plan
prior to submitting to ACS Office.
7-2-5/9 Special Periodical Survey – To specify survey requirements for air intake shut off arrangements for
Machinery internal combustion engines.
7-2-5/9.3.7 Ventilation Valves To specify requirement to open and examine the ventilation valves at
(New) Special Survey.
7-2-6/1.5v) Suspect Areas To align the requirements with current practice, whereby examination of
all parts below the waterline (submerged parts of the leg structure to
spud can connections) are postponed until the next rig move.
7-2-6/1.9.4 HIMP Notation To specify HIMP survey requirements.
(New)
7-2-6/3 Underwater Inspection in Lieu of To remove the limitation of the 20 year requirement and include items
Drydocking (UWILD) to be in the UWILD Plan.
7-2-6/3.7 Crediting UWILD on a Self- To align the requirements with current practice, whereby examination of
Elevating Unit without Completing all parts below the waterline (submerged parts of the leg structure to
the Examination of Spud Cans/Mat spud can connections) are postponed until the next rig move.
7-2-A4/1 General To specify that to credit a part for a Periodical Machinery Survey in
the middle of the survey, the vessel must be on Continuous Machinery
Survey.
7-2-A4/3.1 Surveys To specify that to credit a part for a Periodical Machinery Survey in
the middle of the survey, the vessel must be on Continuous Machinery
Survey.

ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS . 2018 9