CD0396. Gas carrier, Cargo cooling systems, introduction

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CD0396. Gas carrier, Cargo cooling systems, introduction
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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD0396. Gas carrier, Cargo cooling systems, introduction” contains 12 questions across 1 collection.

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What do we mean by the ‘critical point’ of a fluid and why is it important? Select the ONE correct answer.

One correct answer

It is the temperature and pressure at which the liquid and vapour phases co-exist. There is no latent heat, so we cannot use the fluid in a refrigeration cycle✓ Correct answer
It is the point at which enough latent heat has been gained to turn a liquid into a vapour. It is the point at which we can start to compress the vapour.
It is the point at which enough latent heat has been removed to turn a vapour into a liquid. It is the point at which the fluid exits the condenser.
It is the point at which enough latent heat has been removed to turn a liquid into a solid. It must be avoided for good heat transfer.

Why can Ethane not be condensed using a seawater cooled condenser? Select the ONE correct answer.

One correct answer

The condenser pressure would be too high.✓ Correct answer
Ethane cannot be turned into a liquid, except in a laboratory.
The volume of seawater required to remove the required amount of heat would be too great.
Ethane reacts with seawater.

What type of cargoes would need to use a cascade cooling plant? Select the ONE correct answer.

One correct answer

Those with a low boiling point✓ Correct answer
Those with a high boiling point
Those with a high critical temperature
Those that are particularly flammable

During the cargo liquefaction process, from what point is cargo taken? Select the ONE correct answer

One correct answer

It is taken as vapour, from the top of the cargo tank.✓ Correct answer
It is taken as liquid, from the bottom of the cargo tank.
It is taken at the surface of the liquid, where its removal will have the greatest cooling effect.
It is taken from just below the surface of the cargo, where its removal will have the greatest cooling effect.

Cooling or Liquefaction plants are one way of keeping the pressure inside cargo tanks within acceptable limits. What other methods are commonly used? Select the TWO correct answers.

Multiple correct answers

Burning the gas in a gas combustion unit.✓ Correct answer
Some cargoes like LNG can be used in the main propulsion plant.✓ Correct answer
Venting the cargo
Transferring some of the cargo to other tanks

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