RULES FOR BUILDING AND CLASSING
MOBILE OFFSHORE DRILLING UNITS
2001
CORRIGENDA/EDITORIALS – 4 June 2001
CORRIGENDA/EDITORIALS – 1 August 2001
CORRIGENDA/EDITORIALS – 1 October 2001
CORRIGENDA/EDITORIALS – 4 February 2002
CORRIGENDA/EDITORIALS – 2 May 2002
CORRIGENDA/EDITORIALS – 4 September 2002
CORRIGENDA/EDITORIALS – 1 April 2003
CORRIGENDA/EDITORIALS – 3 November 2003
CORRIGENDA/EDITORIALS – 19 August 2004
CORRIGENDA/EDITORIALS – 1 March 2005
CORRIGENDA/EDITORIALS – 15 June 2005
CORRIGENDA/EDITORIALS – 18 October 2005
Page No. Paragraph Comments
Part 1 Conditions of Classification
Chapter 1 Scope and Conditions of Classification
Appendix 1 Classification Symbols and Notations
51 1-1-A1/Table B In description for Fire Fighting Vessel Class 2 “three (3) foam monitors”
in fourth line to read “three (3) water monitors”.
51 1-1-A1/Table B In description for Fire Fighting Vessel Class 3 “four (4) foam monitors”
in first line to read “four (4) water monitors”.
60 1-1-A1/Table E Description for SFA to read “This notation is assigned to vessels, where
Spectral Fatigue Analysis is performed in accordance with an acceptable
procedure and criteria, and the vessel is built in accordance with plans
approved on the basis of the results of such analysis. The vessel will be
distinguished in the Record by the notation SFA (year). The notation, SFA
(year), denotes that the designated fatigue life value is equal to 20 years or
greater. The (year) refers to the designated fatigue life equal to 20 years or
more (in 5-year increments) as specified by the applicant.”.
60 1-1-A1/Table E Reference for SFA to read “SVR 1-1-3/20”.
62 1-1-A1/Table F Description for SAS to read “This notation, Special Annual Survey, is
assigned to vessels designed on a unique experimental basis and/or vessels
which may have lesser scantlings than required by the current ABS
Rules/Guides (e.g. very lightweight high-speed craft). When “Annual
Survey” is part of a vessel’s Hull Classification, all the requirements of
Special Periodical Survey – Hull, except for tank testing, are required each
year for the first four years of each five-year cycle. This survey is referred to
as a Special Annual Survey (SAS). At the fifth year, a complete Special
Periodical Survey – Hull, including tank testing, is required.”.
ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS 2001 1
Corrigenda/Editorials – 18 October 2005
Page No. Paragraph Comments
Part 3 Hull Construction and Equipment
Chapter 1 General
Section 2 Environmental Loadings
12 3-1-2/Table 2 In column for “Height (meters)”, value “256.0” to read “259.0”
Part 3 Hull Construction and Equipment
Chapter 1 General
Appendix 3 Guide for Material Selection for ABS Grades of High Strength Quenched and Tempered Steel
61 3-1-A3/Table 2 In the “Test Temperature” column for DQ43 in the second row “−20 (4)” to
read “−20 (−4)”.
62 3-1-A3/Table 3 In the “Special” column for 0°C (32°F) “DQ70” to read “EQ70”.
Part 3 Hull Construction and Equipment
Chapter 2 Hull Structures and Arrangements
Section 2 Common Structures
79 3-2-2/7.7.3 In line with change in 3-2-9/Figure 4, revise second sentence to read “Joints
within 10% of the depth of corrugation from the outer surface of corrugation,
d1, are to have…”.
81 3-2-2/Figure 2 For clarity, change dimension “d” to “d1” as shown below:
t
0.1d1
d1
0.7t
Part 3 Hull Construction and Equipment
Chapter 3 Subdivision and Stability
Section 1 Stability and Watertight/Weathertight Integrity
133 3-3-1/3.3.3 Add the following to the end of the sentence: “after assuming damage under
3-3-1/1.3.2(a):”.
133 3-3-1/3.3.3(a) In first line, delete “after assuming damage under 3-3-1/1.3.2(a)”.
135 3-3-1/3.9.1 Renumber “3.9.1 Guidelines” to read “3.9.2 Guidelines”.
135 3-3-1/3.9.3 Revise to read “Specific reference may be made to Appendix 3-3-A1 “Guide
for the Application of Dynamic Response Based Intact Stability Criteria for
Column-stabilized Mobile Offshore Drilling Units”. This Appendix and
associated Appendices 3-3-A1a through 3-3-A1c provide a means of
determining adequate intact stability in severe storm conditions.”
Part 3 Hull Construction and Equipment
Chapter 4 Fire Safety Measures
Section 1 Structural Fire Protection and Means of Escape
180 3-4-1/5.29 In first line, “0.22 in2” to read “0.22 ft2”.
2 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS 2001
Corrigenda/Editorials – 18 October 2005
Page No. Paragraph Comments
Part 4 Machinery and Systems
Chapter 1 Machinery, Equipment and Their Installation
Section 1 General
5 4-1-1/Table 1 The “Dynamic” column for Surface Units to read “22.5º rolling and 7.5º
pitching simultaneously”.
2 4-1-1/11 Reference “4-1-1/13.21” to read “4-1-1/10.3”.
(Notice 3)
Part 4 Machinery and Systems
Chapter 1 Machinery, Equipment and Their Installation
Section 2 Rotating Machinery
13 4-1-2/5 Title to read “Thrusters and Dynamic Positioning Systems”.
13 4-1-2/5 In third line, “…dynamic positioning thrusters, where an optional symbol…”
to read “…dynamic positioning systems, including their thrusters, where an
optional notation…”.
Part 4 Machinery and Systems
Chapter 2 Pumps and Piping Systems
Section 2 Pumps, Pipes, Valves and Fittings
53 4-2-2/7.9 In the first line of the first paragraph, reference “4-1-1/17” to read “4-1-1/5”.
67 4-2-2/27.3 Title to read “Integral Keel Cooler Installations”.
67 4-2-2/27.5 Title to read “Non-integral Keel Cooler Installations” and text to read “Where
non-integral keel coolers are used…”.
Part 4 Machinery and Systems
Chapter 2 Pumps and Piping Systems
Section 3 Bilge and Ballast Systems and Tanks
6 4-2-3/7.1 Delete “by 4-2-3/9.1”.
76 4-2-3/13.1 In last paragraph, delete second occurrence of “either a distance of 4.6 m (15
ft.) or to the severe storm draft”.
Part 4 Machinery and Systems
Chapter 2 Pumps and Piping Systems
Section 4 Fuel Oil and Other Piping Systems and Tanks
81 4-2-4/15.5.1(a) Revise to read “In general, pipes, pipe fittings, pipe joints and valves are to be
in accordance with the provisions of Section 4-2-2 for Class I piping systems,
except as modified below.”.
82 4-2-4/15.7 Revise first sentence, to read “Piping on the oxygen high-pressure side is to
be tested before installation to at least 295 bar (300 kgf/cm2, 4278 psi) and
the piping on the acetylene high-pressure side is to be tested in accordance
with Section 4-2-2.”.
95 4-2-4/17.3.2 References “4-2-4/17.1ii)” and “4-2-4/17.1iii)” to read “4-2-4/17.1.2” and
4-2-4/17.1.3”, respectively.
ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS 2001 3
Corrigenda/Editorials – 18 October 2005
Page No. Paragraph Comments
Part 4 Machinery and Systems
Chapter 3 Electrical Installations
Section 1 General
106 4-3-1/12 Insert the following between the existing 4-3-1/11 and 4-3-1/13:
“12 Grounding Arrangements
Where not obtained through normal construction, arrangements are to
be provided to effectively ground metal structures of derricks, masts
and helicopter decks. See also 4-2-4/16.1.2 for fuel storage for
helicopter facilities. Grounding arrangements are also to be provided
for tending vessels.”
Part 4 Machinery and Systems
Chapter 3 Electrical Installations
Section 2 Drilling Unit Systems
113 4-3-2/1.1.2 For “Generator”, “kW or kVA rating” to read “kVA rating”.
113 4-3-2/1.1.2 For “Generator”, “kVA rating” to read “kW rating”.
118 4-3-2/5.3 In the first and last lines of the last paragraph “cold ship” to read
“dead ship (blackout)”.
119 4-3-2/5.5.4 Third line to read: “…to supply non-emergency circuits during dead ship
(blackout) start-up and routine use for testing.”.
214 4-6-2/9.3.1 In first and second lines, “25 kW” to read “25 kVA”.
214 4-6-2/9.3.1 In first and second lines, “25 kVA” to read “25 kW”.
Part 4 Machinery and Systems
Chapter 3 Electrical Installations
Section 3 Drilling Unit Installation
150 4-3-3/9.1.2(b) Renumber Items i) through v) as follows:
i) Certified intrinsically-safe circuits or equipment and associated
wiring
ii) Certified flameproof (explosion proof) equipment
iii) Certified increased safety equipment; for increased safety
motors, consideration is to be given to the protection against
overcurrent
iv) Pressurized enclosure type equipment (see 4-3-3/9.3.3).
v) Permanently installed cables with:
- metallic armor, or
- of mineral insulated metallic sheathed type, or
- installed in metallic conduit with explosion-proof gas-
tight fittings, or
vi) Flexible cables, where necessary, provided they are of heavy
duty type.
4 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS 2001
Corrigenda/Editorials – 18 October 2005
Page No. Paragraph Comments
Part 4 Machinery and Systems
Chapter 3 Electrical Installations
Section 4 Machinery and Equipment
158 Table of Title of 4-6-4/Table 1 to read “Factory Testing Schedule for Rotating
Contents Machines of 100 kVA/kW and Over”.
158 Table of Title of 4-3-4/Table 1 to read “Factory Testing Schedule for Generators and
Contents Motors ≥ 100 kW”.
159 4-3-4/1.1 In title “100 kW” to read “100 kVA/kW”.
159 4-3-4/1.1 In title “100 kVA/kW” to read “100 kW”.
159 4-3-4/1.3 In title “100 kW” to read “100 kVA/kW”.
159 4-3-4/1.3 In title “100 kVA/kW” to read “100 kW”.
159 4-3-4/3.1.1 In first and third lines “100 kW” to read “100 kVA/kW”.
159 4-3-4/3.1.1 In first and third lines “100 kVA” to read “100 kW”.
160 4-3-4/3.3.1 In title and first line of items 4-3-4/3-3-1(a) and 4-3-4/3.3.1(b), “100 kW” to
read “100 kVA/kW”.
160 4-3-4/3.3.1 In title and first line of items 4-3-4/3-3-1(a) and 4-3-4/3.3.1(b), “100 kW” to
read “100 kVA/kW”.
166 4-3-4/3.21.4 In first line, “500 kVA” to read “500 kW”.
179 4-3-4/Table 1 Title to read “Factory Testing Schedule for Rotating Machines of 100
kVA/kW and Over”.
179 4-3-4/Table 1 Title to read “Factory Testing Schedule for Generators and Motors ≥ 100
kW”.
179 4-3-4/Table 1 In Note 4, “generators ≥ 100 kVA and motors ≥ 100 kW (135 hp)” to read
“generators and motors ≥ 100 kW (135 hp)”.
183 4-3-4/Table 6 In Note 2, “11 kV” to read “15 kV”.
184 4-3-4/Table 7 In Row 14, “500 kW” to read “500 kVA” (2 places).
184 4-3-4/Table 7 In Row 14, “500 kVA” to read “500 kW” (2 places).
Part 4 Machinery and Systems
Chapter 4 Fire Safety Systems
Section 1 Equipment and Systems
218 4-4-1/7.13.1 In fourth line, values “3 bar (3 kgf/cm2, 40 psi)” to read “3.5 bar (3.5
kgf/cm2, 50 psi)”.
Part 5 Surveys After Construction
Chapter 1 Surveys After Construction
Section 1 Underwater Inspection in Lieu of Drydocking
8 5-1-1/19.1 In second sentence of second paragraph, delete “in” between “operating” and
“solely”.
Part 5 Surveys After Construction
Chapter 1 Surveys After Construction
Appendix 1 Underwater Inspection in Lieu of Drydocking
50 5-1-A1/7.3 In second-to-last sentence, “…for forwarding with his report” to read “…for
retention at the local office for5 years”.
ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS 2001 5
