Liquefied Gas Carrier

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Preparation for Changing of Cargoes - Liquefied Gas carrier Operation

Before changing cargoes or gas-freeing it is most important to remove all cargo liquid from tanks, piping, reliquefaction plant and any other part of the cargo system. Any remaining cargo liquid will continue to give off vapour and will frustrate subsequent purging or gas-freeing.

If previous and subsequent cargoes are similar in chemical properties – e.g. propane and butane – purging may not be required (subject to shippers’ considerations), but even in such cases it is normally required that no previous cargo liquid remains. Shippers’ instructions regarding purging requirements should always be sought.


To achieve maximum drainage of liquid during discharge, the following advice should be followed:

Procedure for Liquefied Gas Cargo stripping

Displacing Atmosphere with Inert Gas (Inerting)

Displacing with Vapour of the Next Cargo (Purging)

Procedure for Water washing after Ammonia Cargoes





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


Gas cargo containment systems - primary barrier (the cargo tank),secondary barrier, thermal insulation and more

Discussion prior to cargo transfer in liquefied gas carrier

Safety checklist for gas carrier

Tanker Cargo Operations Logbook

Connecting Bonding Cable









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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