Liquefied Gas Carrier

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Commissioning the cargo system on board liquefied gas carriers

Before a new ship is commissioned to carry liquefied gas, it is essential that all parts of the cargo system are clean and dry to prevent faults or damage and that safety equipment has been checked and tested.

After dry docking or repairs, cargo tanks should be cleaned and inspected at all levels to ensure that accumulations of rust, water and possible loose objects have been removed. Internal fittings should be checked for tightness and security of nuts, bolts etc., which preferably should have been spot welded. Manholes should be checked for the correct type of gaskets and possible damage; covers should be properly tightened down.



It is essential that pipelines, valves and pumps are carefully dried out. Piping systems should be thoroughly blown through with adequate quantities of compressed air followed by nitrogen, making full use of the drains in the system in proper sequence. Special attention should be paid to the body cavities of valves and to convolutions of expansion bellows.

The emergency shutdown system and the operation of all actuator valves, compressor and pump cut-outs etc. should be checked.

Final adjustment and testing of some cargo plant control equipment can not be carried out with cargo on board. Arrangements should be made in advance with the shore installation to allow this work to be carried out by competent personnel during early stages of first loading. Pipe supports should be checked, especially where expansion bellows are fitted.



Related Information:

  1. Safety checklist for gas carrier


  2. Details of various cargo handling equipment onboard

  3. Reactivity of liquefied gas cargo and safety guideline


  4. Preparatory operations for drydocking


  5. Type of gas carriers - variation in the design, construction and operation


  6. Cargo conditioning, reliquefaction and boil-off control requirement for a liquefied gas carrier

    Cargo Containment Systems in Liquefied Gas Carriers

    cargo emergency shutdown requirement

    damage stability guideline for liquefied gas carriers

    Various Cargo handling equipments onboard

    Cargo hoses connection guideline

    Documents accompanying a liquid gas cargo

    How LNG transferred from shore to ships cargo tanks ?

    Cargo operation guideline onboard a liquefied gas carrier

    Cargo piping Systems in Liquefied Gas Carriers

    cargo planning requirement

    cargo and pumproom safety precautions

    cargo stripping guideline

    Emergency response for cargo system leaks

    Emergency response for cargo tank rupture

    Risk of overfilling of cargo tank during loading onboard a liquefied gas carrier

    Preparation for cargo transfer

    cargo transfer between vessels- safety guideline







    Related Information:

    1. LNG tank leaks and immediate action by gas carriers


    2. Leaks from a Loading Arm due to Tidal or Current Effects

    3. Minor or major leaks from LNG tanks


    4. Risk of Overfilling of Cargo Tank during Loading


    LNG spill risk during marine transportation and hazards associated

    How to tackle fire on board LNG ship

    Fire fighting plan for LNG cargo





    Cargo conditioning, reliquefaction and boil-off control requirement for a liquefied gas carrier

    Cargo Containment Systems in Liquefied Gas Carriers

    cargo emergency shutdown requirement

    damage stability guideline for liquefied gas carriers

    Various Cargo handling equipments onboard

    Cargo hoses connection guideline

    Documents accompanying a liquid gas cargo

    How LNG transferred from shore to ships cargo tanks ?

    Cargo operation guideline onboard a liquefied gas carrier

    Cargo piping Systems in Liquefied Gas Carriers

    cargo planning requirement

    cargo and pumproom safety precautions

    cargo stripping guideline

    Emergency response for cargo system leaks

    Emergency response for cargo tank rupture

    Risk of overfilling of cargo tank during loading onboard a liquefied gas carrier

    Preparation for cargo transfer

    cargo transfer between vessels- safety guideline





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