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MODULE 2L: Carriage of Liquefied Gases in Bulk


The participant who has completed the module will be able to understand:

  • ship arrangement and ship survival capacity;
  • cargo containment and material of construction;
  • process pressure vessels and liquid,
  • vapour and pressure piping systems;
  • cargo tank vent systems and environmental control;
  • personnel protection; use of cargo as fuel; and
  • operational requirements


The assessment methods will be to choose the best answer from a selection of alternatives.

In the method of objective evaluation, only be accepted one correct answer is valid, and never more than one selection within the same question since they will be automatically considered incorrect.  The participants approve the course with a score equal to or greater than 70% of the total value of the assessment. All evaluations will be based on a Total Score of 100.

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Exam Questions

1. The purpose of the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) is to provide an international standard for the safe carriage by sea in bulk of liquefied gases and certain other substances listed in chapter 19 of the IGC Code, by prescribing the design and construction standards of ships involved in such carriage and the equipment they should carry so as to minimize the risk to the ship, to its crew and to the environment, having regard to the nature of the products involved.

2. The IGC Code applies to ships regardless of their size, including those of less than 500 tons gross tonnage, engaged in carriage of liquefied gases having a vapour pressure exceeding 2.8 bar absolute at a temperature of 37.8°C, and other products as shown in chapter 19 of the IGC Code, when carried in bulk.

3. The structure, equipment, fittings, arrangements and material (other than items in respect of which a Cargo Ship Safety Construction Certificate, Cargo Ship Safety Equipment Certificate and Cargo Ship Safety Radio Certificate or Cargo Ship Safety Certificate are issued) of a gas carrier should be subjected to the following surveys:

4. Ships subject to the IGC Code should be designed to one of the following standards:

5. Shipside discharges below the freeboard deck: The provision and control of valves fitted to discharges led through the shell from spaces below the freeboard deck or from within the superstructures and deckhouses on the freeboard deck fitted with weathertight doors should comply with the requirements of the relevant regulation of the International Convention on Load Lines in force, except that the choice of valves should be limited to:

6. Cargo tanks should be located at the following distances inboard:

7. Hold spaces should be segregated from machinery and boiler spaces, accommodation spaces, service spaces and control stations, chain lockers, drinking and domestic water tanks and from stores. Hold spaces should be located forward of machinery spaces of category A, other than those deemed necessary by the Administration for the safety or navigation of the ship.

8. Cargo pump rooms and cargo compressor rooms should be situated above the weather deck and located within the cargo area unless specially approved by the Administration. Cargo compressor rooms should be treated as cargo pump rooms for the purpose of fire protection according to SOLAS regulation II-2/9.2.4.

9. Any cargo control room should be above the weather deck and may be located in the cargo area. The cargo control room may be located within the accommodation spaces, service spaces or control stations provided the following conditions are complied with:

10. Access to spaces in the cargo area should be provided to

11. Integral tanks form a structural part of the ship's hull and are influenced in the same manner and by the same loads which stress the adjacent hull structure.

12. Membrane tanks are non-self-supporting tanks which consist of a thin layer (membrane) supported through insulation by the adjacent hull structure. The membrane is designed in such a way that thermal and other expansion or contraction is compensated for without undue stressing of the membrane.

13. Every cargo piping system and cargo tank should be provided with the following valves, as applicable:

14. All cargo tanks should be provided with a pressure relief system appropriate to the design of the cargo containment system and the cargo being carried. Hold spaces, interbarrier spaces and cargo piping which may be subject to pressures beyond their design capabilities should also be provided with a suitable pressure relief system. The pressure relief system should be connected to a vent piping system so designed as to minimize the possibility of cargo vapour accumulating on the decks, or entering accommodation spaces, service spaces, control stations and machinery spaces, or other spaces where it may create a dangerous condition.

15. The refrigeration system may be arranged in one of the following ways:

16. A piping system should be provided to enable each cargo tank to be safely gas-freed, and to be safely purged with cargo gas from a gas-free condition. The system should be arranged to minimize the possibility of pockets of gas or air remaining after gas-freeing or purging

17. Safety equipment: Sufficient, but not less than two complete sets of safety equipment in addition to the firemen's outfits, permitting personnel to enter and work in a gas-filled space, should be provided. One complete set of safety equipment should consist of:

18. Methane (LNG) is the only cargo whose vapour or boil-off gas may be utilized in machinery spaces of category A and in such spaces may be utilized only in boilers, inert gas generators, combustion engines and gas turbines. These provisions do not preclude the use of gas fuel for auxiliary services in other locations, provided that such other services and locations should be subject to special consideration by the Administration.

19. Information should be on board and available to all concerned, giving the necessary data for the safe carriage of cargo. Such information should include for each product carried: a full description of the physical and chemical properties necessary for the safe containment of the cargo; action to be taken in the event of spills or leaks; counter-measures against accidental personal contact; fire-fighting procedures and firefighting media; procedures for cargo transfer, gas-freeing, ballasting, tank cleaning and changing cargoes; special equipment needed for the safe handling of the particular cargo; minimum allowable inner hull steel temperatures; and emergency procedures.