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March 1993

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International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) (I104E)

(Excludes any applicable taxes)

The purpose of the IGC Code is to provide an international standard for the safe carriage by sea of liquefied gases (and other substances listed in the Code) in bulk. This edition incorporates amendments adopted by the Maritime Safety Committee at its sixty-first session (December 1992) by resolution MSC.30(61). It also includes a supplement containing amendments adopted by resolutions MSC.32(63) and MSC.59(67).

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To minimize risks to ships involved in such carriage, to their crews and to the environment, the Code prescribes the design and constructional standards of such ships and the equipment they should carry.


Chapter 1 – General

1.1 Application

1.2 Hazards

1.3 Definitions

1.4 Equivalents

1.5 Surveys and certification

Chapter 2 – Ship survival capability and location of cargo tanks

2.1 General

2.2 Freeboard and intact stability

2.3 Shipside discharges below the freeboard deck

2.4 Conditions of loading

2.5 Damage assumptions

2.6 Location of cargo tanks

2.7 Flooding assumptions

2.8 Standard of damage

Chapter 3 – Ship arrangements

3.1 Segregation of the cargo area

3.2 Accommodation, service and machinery spaces and control stations

3.3 Cargo pump-rooms and cargo compressor rooms

3.4 Cargo control rooms

3.5 Access to spaces in the cargo area

3.6 Airlocks

3.7 Bilge, ballast and fuel oil arrangements

3.8 Bow or stern loading and unloading arrangements

Chapter 4 – Cargo containment

4.1 General

4.2 Definitions

4.3 Design loads

4.4 Structural analyses

4.5 Allowable stresses and corrosion allowances

4.6 Supports

4.7 Secondary barrier

4.8 Insulation

4.9 Materials

4.10 Construction and testing

4.11 Stress relieving for type C independent tanks

4.12 Guidance formulae for acceleration components

4.13 Stress categories

Chapter 5 – Process pressure vessels and liquid vapour and pressure piping systems

5.1 General

5.2 Cargo and process piping

5.3 Type tests on piping components

5.4 Piping fabrication and joining details

5.5 Testing of piping

5.6 Cargo system valving requirements

5.7 Ship’s cargo hoses

5.8 Cargo transfer methods

5.9 Vapour return connections

Chapter 6 – Materials of construction

6.1 General

6.2 Material requirements

6.3 Welding and non-destructive testing

Chapter 7 – Cargo pressure/Temperature control

7.1 General

7.2 Refrigeration systems

Chapter 8 – Cargo tank vent systems

8.1 General

8.2 Pressure relief systems

8.3 Additional pressure relieving system for liquid

8.4 Vacuum protection systems

8.5 Size of valves

Chapter 9 – Environmental control

9.1 Environmental control within cargo tanks and cargo piping systems

9.2 Environmental control within the hold spaces (cargo containment systems other than type C independent tanks)

9.3 Environmental control of spaces surrounding type C independent tanks

9.4 Inerting

9.5 Inert gas production on board

Chapter 10 – Electrical Installations

10.1 General

10.2 Types of equipment

Chapter 11 – Fire protection and fire extinction

11.1 Fire safety requirements

11.2 Fire water main equipment

11.3 Water-spray system

11.4 Dry chemical powder fire-extinguishing systems

11.5 Cargo compressor and pump-rooms

11.6 Fireman’s outfits

Chapter 12 – Mechanical ventilation in the cargo area

12.1 Spaces required to be entered during normal cargo handling operations

12.2 Spaces not normally entered

Chapter 13 – Instrumentation (gauging, gas detection)

13.1 General

13.2 Level indicators for cargo tanks

13.3 Overflow control

13.4 Pressure gauges

13.5 Temperature indicating devices

13.6 Gas detection requirements

Chapter 14 – Personnel protection

14.1 Protective equipment

14.2 Safety equipment

14.3 First-aid equipment

14.4 Personnel protection requirements for individual products

Chapter 15 – Filling limits for cargo tanks

15.1 General

15.2 Information to be provided to the master

Chapter 16 – Use of cargo as fuel

16.1 General

16.2 Arrangement

16.3 Gas fuel supply

16.4 Gas make-up plant and related storage tanks

16.5 Special requirements for main boilers

16.6 Special requirements for gas-fired internal combustion engines and gas-fired turbines

Chapter 17 – Special requirements

17.1 General

17.2 Materials of construction

17.3 Independent tanks

17.4 Refrigeration systems

17.5 Deck cargo piping

17.6 Exclusion of air from vapour spaces

17.7 Moisture control

17.8 Inhibition

17.9 Permanently installed toxic gas detectors

17.10 Flame screens on vent outlets

17.11 Maximum allowable quantity of cargo per tank

17.12 Submerged electric cargo pumps

17.13 Ammonia

17.14 Chlorine

17.15 Diethyl ether and vinyl ethyl ether

17.16 Ethylene oxide

17.17 Isopropylamine and monoethylamine

17.18 Methyl acetylene-propadiene mixtures

17.19 Nitrogen

17.20 Propylene oxide and mixtures of ethylene oxide - propylene oxide with ethylene oxide content of not more than 30% by weight

17.21 Vinyl chloride

Chapter 18 – Operating requirements

18.1 Cargo information

18.2 Compatibility

18.3 Personnel training

18.4 Entry into spaces

18.5 Carriage of cargo at low temperature

18.6 Protective equipment

18.7 Systems and controls

18.8 Cargo transfer operations

18.9 Additional operating requirements

Chapter 19 – Summary of minimum requirements

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: International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) (I104E)
Edition: 1993
Number of Pages: 166
Product Code: 4410M027
ISBN: ISBN 13: 9789280112771, ISBN 10: 9280112775
Published Date: March 1993
Binding Format: Paperback
Book Height: 240 mm
Book Width: 150 mm
Book Spine: 10 mm
Weight: 0.36 kg
Author: IMO

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