MODU Code: Code for the Construction and Equipment of Mobile Offshore Drilling Units, Consolidated Edition 2001 (KA811E) (eBook)

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Published Date

January 2001

MODU Code: Code for the Construction and Equipment of Mobile Offshore Drilling Units, Consolidated Edition 2001 (KA811E) (eBook)

(Excludes any applicable taxes)

The Code for the Construction and Equipment of Mobile Offshore Drilling Units, 1989 (1989 MODU Code) was adopted by resolution A.649(16) and concerns MODUs built since 1 May 1991.


No. OF PAGES: 140

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The Maritime Safety Committee (MSC) adopted amendments to the 1989 MODU Code in May 1991 and decided that, to maintain compatibility with SOLAS, the amendments should become effective on 1 February 1992. Further amendments were adopted in May 1994, to introduce the Harmonized System of Survey and Certification (HSSC) into the Code, provide guidelines for vessels with dynamic positioning systems and introduce provisions for helicopter facilities. The Committee decided that the amendments introducing the HSSC should become effective on the same date as the 1988 SOLAS and Load Line Protocols relating to the HSSC (i.e. 3 February 2000), and that those providing guidelines for vessels with dynamic positioning systems and provisions for helicopter facilities should become effective on 1 July 1994.


This publication supersedes the 1979 edition and contains a consolidated text of the 1989 MODU Code and the 1991 and 1994 amendments.


IMO Code: KA811E


Chapter 1 – General

1.1 Purpose

1.2 Application

1.3 Definitions

1.4 Exemptions

1.5 Equivalents

1.6 Surveys and certification

1.7 Control

1.8 Casualties

1.9 Review of the Code

Chapter 2 – Construction, strength and materials

2.1 General

2.2 Design loads

2.3 Structural analysis

2.4 Special considerations for surface units

2.5 Special considerations for self-elevating units

2.6 Special considerations for column-stabilized units

2.7 Fatigue analysis

2.8 Materials

2.9 Construction portfolio

2.10 Welding

2.11 Testing

Chapter 3 – Subdivision, stability and freeboard

3.1 Inclining test

3.2 Righting moment and heeling moment curves

3.3 Intact stability criteria

3.4 Subdivision and damage stability

3.5 Extent of damage

3.6 Watertight integrity

3.7 Freeboard

Chapter 4 – Machinery installations for all types of units

4.1 General

4.2 Machinery requirements

4.3 Steam boilers and boiler feed systems

4.4 Steam pipe systems

4.5 Machinery controls

4.6 Air pressure systems

4.7 Arrangements for oil fuel, lubricating oil and other flammable oils

4.8 Bilge pumping arrangements

4.9 Ballast pumping arrangements on column-stabilized units

4.10 Protection against flooding

4.11 Anchoring arrangements for surface and column–stabilized units

4.12 Dynamic positioning systems

Chapter 5 – Electrical installations for all types of units

5.1 General

5.2 Main source of electrical power

5.3 Emergency source of electrical power

5.4 Starting arrangements for emergency generators

5.5 Precautions against shock, fire and other hazards of electrical origin

5.6 Internal communication

Chapter 6 – Machinery and electrical installations in hazardous areas for all types of units

6.1 Zones

6.2 Classification of hazardous areas

6.3 Openings, access and ventilation conditions affecting the extent of hazardous areas

6.4 Ventilation of spaces

6.5 Emergency conditions due to drilling operations

6.6 Electrical installations in hazardous areas

6.7 Machinery installations in hazardous areas

Chapter 7 – Machinery and electrical installations for self-propelled units

7.1 General

7.2 Means of going astern

7.3 Steam boilers and boiler feed systems

7.4 Machinery controls

7.5 Steering gear

7.6 Electric and electrohydraulic steering gear

7.7 Communication between the navigating bridge and the engine-room

7.8 Engineers’ alarm

7.9 Main source of electrical power

7.10 Emergency source of electrical power

Chapter 8 – Periodically unattended machinery spaces for all types of unit

8.1 General

8.2 Application

8.3 Fire safety

8.4 Protection against flooding

8.5 Bridge control of propulsion machinery

8.6 Communication

8.7 Alarm system

8.8 Special requirements for machinery, boiler and electrical installations

8.9 Safety systems

Chapter 9 – Fire safety

9.1 Structural fire protection

9.2 Protection of accommodation spaces, service spaces and control stations

9.3 Means of escape

9.4 Fire pumps, fire mains, hydrants and hoses

9.5 Fire-extinguishing systems in machinery spaces and in spaces containing fired processes

9.6 Portable fire extinguishers in accommodation, service and working spaces

9.7 Fire detection and alarm system

9.8 Gas detection and alarm system

9.9 Fireman’s outfits

9.10 Arrangements in machinery and working spaces

9.11 Provisions for helicopter facilities

9.12 Storage of gas cylinders

9.13 Miscellaneous items

Chapter 10 – Life saving appliances and equipment

10.1 General

10.2 Survival craft

10.3 Survival craft muster and embarkation arrangements

10.4 Survival craft launching stations

10.5 Stowage of survival craft

10.6 Survival craft launching and recovery arrangements

10.7 Rescue boats

10.8 Stowage of rescue boats

10.9 Rescue boat embarkation, launching and recovery arrangements

10.10 Lifejackets

10.11 Immersion suits

10.12 Lifebuoys

10.13 Radio life-saving appliances

10.14 Distress flares

10.15 Line-throwing appliances

10.16 Emergency warnings

10.17 Operating instructions

10.18 Operational readiness, maintenance and inspections

Chapter 11 – Radiocommunication installations

11.1 Application

11.2 General

11.3 Self-propelled units under way

11.4 Units when towed, or self-propelled and accompanied by escort ships

11.5 Units stationary at the site or engaged in drilling operations

11.6 Helicopter communications

11.7 Internal communications

11.8 Performance standards

11.9 Gas explosion danger

11.10 Survey of the radio station

Chapter 12 – Lifting devices

12.1 Cranes

12.2 Personnel lifts

12.3 Drilling derricks

Chapter 13 – Helicopter facilities

13.1 General

13.2 Definitions

13.3 Construction

13.4 Arrangements

13.5 Visual aids

Chapter 14 – Operating requirements

14.1 Operating manuals

14.2 Dangerous goods

14.3 Pollution prevention

14.4 Towing

14.5 Transfer of material, equipment or personnel

14.6 Diving systems

14.7 Safety of navigation

14.8 Emergency procedures

14.9 Emergency instructions

14.10 Training manuals

14.11 Practice musters and drills

14.12 On-board training and instructions

14.13 Records


A​​s a specialized agency of the United Nations, IMO is the global standard-setting authority for the safety, security and environmental performance of international shipping. Its main role is to create a regulatory framework for the shipping industry that is fair and effective, universally adopted and universally implemented.  

In other words, its role is to create a level playing-field so that ship operators cannot address their financial issues by simply cutting corners and compromising on safety, security and environmental performance. This approach also encourages innovation and efficiency.

Shipping is a truly international industry, and it can only operate effectively if the regulations and standards are themselves agreed, adopted and implemented on an international basis. And IMO is the forum at which this process takes place.

Title: MODU Code: Code for the Construction and Equipment of Mobile Offshore Drilling Units, Consolidated Edition 2001 (KA811E) (eBook)
Edition: 2001
Number of Pages: 140
Product Code: MM1316EA
ISBN: ISBN 13: 9789280151091, ISBN 10: 9280151096
Published Date: January 2001
Author: IMO

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