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Preventive measures against spillage of low temperature cargo in gas carrier

Liquid spills have the potential to cause damage to the ship's structure and frostbite or chemical burns to any person contacting the liquid or cold vapour. The liquid will evaporate to form a flammable or toxic cloud.

The rate at which spilled liquid vapourises and forms a gas cloud depends mainly on the properties of the liquid spilled, the air temperature, the nature of the surface it is spilled on and the area that it spreads over. Initially the cloud will be cold and low lying and drift down wind. It may be visible as a white cloud, which is condensed water vapour.




Care should be taken to prevent spillage of low temperature cargo because of the hazard to personnel and the danger of brittle fracture. Remember that a flammable or toxic cloud may not be visible. If spillage does occur, the source should first be isolated and the spilt liquid then dispersed. If these is a danger of brittle fracture, a water hose may be used both to vaporize the liquid and to keep the steel warm.

If the spillage is contained in a drip tray the contents should be covered or protected to prevent accidental contact and allowed to evaporate. Liquefied gases quickly reach equilibrium and visible boiling ceases; this quiescent liquid could be mistaken for water and carelessness could be dangerous.

Suitable drip trays are arranged beneath manifold connections to control any spillage when transferring cargo or draining lines and connections. Care should be taken to ensure that unused manifold connections are isolated and that if blanks are to be fitted the flange surface is clean and free from frost. Accidents have occurred because cargo escaped past incorrectly fitted blanks.

Suitable drip trays are arranged beneath manifold connections to control any spillage when transferring cargo or draining lines and connections. Care should be taken to ensure that unused manifold connections are isolated and that if blanks are to be fitted the flange surface is clean and free from frost. Accidents have occurred because cargo escaped past incorrectly fitted blanks.

Liquefied gas spilt onto the sea will generate large quantities of vapour by the heating effect of the water. This vapour may create a fire or health hazard, or both. Great care should be taken to avoid such spillage, especially when disconnecting cargo hoses.

LNG carrier seaway


analyzing gas cargo equipment
Fig:Analyzing and reporting from control room the high level alarm







Related Information:

  1. Low Cargo Temperature Effects -Ice Formation in gas carrier cargo system


  2. Low Temperature Effects in gas carrier - Causes of Brittle Fracture & contermeasures


  3. How to cool down cargo system - a brief guide to Liquefied gas carrier


  4. Low Cargo Temperature Effects -What is rollover of Liquefied gas cargo ?


  5. Transporting economically viable compressed gas liquids from remote fields


  6. Increased Cargo Capacity for LNG ships & Advantages of the dual fuel diesel electric propulsion


Cargo tank ruptures due to increased pressure - emergency procedure for gas carriers

Risk and hazards of Equipment failure

Loss of Instrumentation during Unloading Operations - Recommended actions by Liquefied Gas carriers

Risk and hazards of Nitrogen Loss

Gas carriers Loss of Instrumentation during Loading Operations

Gas carriers Structural Damage due to Incorrect Loading/Unloading Sequence

Encountering High Winds and/or Waves - countermeasures

Safety guideline for changing previous cargo



External links :

  1. US environmental protection agency website













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