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Connection and disconnection of cargo hoses and hard arms for liquefied gas carriers

(1) No flanges should be disconnected or blanks removed until it is confirmed that line connections are liquid-free and de-pressurized and, where possible, inerted with nitrogen or other suitable inert gas.



(2) Care must be taken to avoid air or contaminants entering cargo pipelines.

(3) The manifold area of a gas carrier is a zone where flammable vapours may be present. Therefore, care must be taken to ensure that ignition sources are eliminated from this area.

At some terminals, problems can be encountered with gas carriers due to mismatching (in positioning or layout) of hard arms in relation to the ship’s cargo manifold. As a result it may be necessary to restrict the number of connections used and, thereby, the overall cargo transfer rates.

An alternative solution involving the use of short lengths of hard piping (Short Distance Piece) to bridge the mismatch, unless properly engineered, should be disallowed as these systems can induce unacceptable loads onto the ship’s manifold piping and supports.

The use of flexible cargo hoses for this purpose should also be disallowed as this procedure degrades the design parameters and security of the hard arm concept. Hose bridging should be restricted to vapour service connections only where permanent systems have been purpose designed. This is sometimes seen on hard arms where vapour return connections are provided by means of piggy-back systems.





Cargo handling gears

Manifold arrangements

Gas analyzing equipment

Custody Transfer Measurement (CTM) System

Related Information:

1. Procedures for various cargo handling equipment onboard



2. Personal protective equipments for people working onboard gas carriers



3. Volatile nature of liquefied gases
   
   
4. How to achieve maximum drainage of liquid during discharge



5. The hazards of liquefied gases - Cargo information and safety factors

More Info pages

Procedure for cargo planning in Liquefied Gas Carriers

Details of various cargo handling equipment onboard

Cargo piping layout for LNG carriers

Procedure for commissioning the cargo system

Preparation for Cargo Transfer

Procedure for discussion prior cargo transfer

Procedure for loading Liquefied Gas Cargoes

Procedure for Cargo Conditioning in Liquefied Gas Carriers

Cargo Transfer between Vessels (STS Operation)

Procedure for segregation of Liquefied Gas Cargoes

Procedure for Stripping Liquefied Gas Cargoes

Procedure for Changing Liquefied Gas Cargoes

Displacing with Vapour of the Next Cargo (Purging)

Procedure for Water washing after Ammonia Cargoes

Details of various cargo handling equipment onboard






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