Corgo Pipes

• Liquid lines
• Vapour lines
• Condensate return lines
• Lines to vent mast
• Pipes inside the cargo tank
• Seawater pipes to the cargo cooling plant

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• Normally fitted with liquid and vapor manifolds situated amidships.
• Connected to liquid and vapor headers “pipelines” with branches leading into each cargo tank.
• Liquid loading line is led through the tank dome to the bottom of each cargo tank.
• Vapor connection is taken from the top of each cargo tank
• Cargo pipelines are not allowed beneath deck level.
• All pipe connections to tanks are taken through the cargo tank domes which penetrates the main deck.
• Design and fitting of cargo pipelines must allow for thermal expansion and contraction.

Cargo Manifolds

Cargo Tank Domes

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• IGC 5.2.1.2 : Protection of piping, piping system components should be made by the use of offsets, loops, bends, mechanical expansion joints such as bellows, slip joints and ball joints.
• All pipelines or components which maybe isolated in a liquid-full condition should be provided with RELIEF VALVES.
• Low-temperature piping should be thermally isolated from the adjacent hull structure, to prevent the temperature of the hull from falling below the design of the hull material.
• Piping that are separated from the ship’s structure by thermal isolation,
• All gasketed pipe joints and hose connections should be electrically bonded.

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• Semi-ref and fully ref LPG ships, a vapor connection is taken from the vapor header to the cargo compressor room where reliquefaction of the boil-off takes place.
• After the reliquefaction the cargo is led via condensate return line “Spray Line”, to each cargo tank.
• For LNG ships, the boil-off vapors are usually fed to ship’s boilers, via a compressor and heater, for use as fuel for main ship’s propulsion.

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