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What is an Air Lock on Gas Carriers?


Doing jobs at gas carrier vessel very most important thing is safety. Berita Kapal tried to present articles about gas carriers, What is an Air Lock on Gas Carriers?

Ships carrying bulk liquefied gases are considered one of the most dangerous cargo carrying ships because of the hazardous and flammable properties cargo. In such ships, highest safety standards are maintained to avoid any kind of accidents from taking place, explosions being the most common of them.


One such safety feature that is provided on Gas carrier ships is Air Lock, a simple yet effective feature.


u1 celestine river What is an Air Lock on Gas Carriers?



What is an Air Lock?
Air Lock is a protected space or room between dangerous gas areas/zones and weather deck. It is a type of gas safe spacePerfect example of such place is the protected entrance space of the cargo compressor motor room, which can be isolated from rest of the spaces.
The driving motor of the cargo compressor in a gas carrier ship is installed in a room different from the compressor room. Moreover, the shaft connecting them passes through a gas tight bulkhead.
The electric motor room is accessible only after crossing the Air lock as a safety measure.

Requirements for Air locks:
  • The air lock room is a gas tight space with two doors spaced minimum 1.5 m and maximum 2.5 m. I t is made up of steel
  • Doors of Air locks must have self closing and no-holding back attachments
  • Air lock space are fitted with sensors to monitor ingress of cargo vapors
  • The height of the door sill must be minimum 300 mm
  • Space must be mechanically ventilated and maintained at pressure higher than that of the surrounding space
  • Audio and visual alarm to be provided if both doors are opened simultaneously
  • Cut out of electric cargo compressor motor has to be provided if pressure of the air lock space falls below the set limit.

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