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CD0395. Gas carrier, Basic principles

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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 — CD0395. Gas carrier, Basic principles” contains 11 questions across 1 collection.

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Sample questions and answers

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Where would you find the regulations about how the cargo refrigeration plant on your ship is constructed? Select any answers that you think apply.

Multiple correct answers

  • The IMO’s International Gas Code (IGC).✓ Correct answer
  • Classification Society Rules.✓ Correct answer
  • Flag State Rules.✓ Correct answer
  • SOLAS.
Why is Nitrogen sometimes used for inerting the tanks of gas carriers, instead of inert gas produced by combustion? Select the ONE correct answer.

One correct answer

  • Because the products of combustion can spoil the purity of some cargoes.✓ Correct answer
  • Because Nitrogen is cheaper to produce.
  • Because Nitrogen can be produced more quickly.
  • Because the Nitrogen has a higher dew point.
What is the purpose of the insulation around the cargo tanks of gas carriers? Select the TWO correct answers.

Multiple correct answers

  • To reduce the amount of heat transferred to the cargo and therefore reduce the amount of cargo that boils off.✓ Correct answer
  • To protect the structure of the ship from contact with cold cargoes, which could cause the steel to become brittle.✓ Correct answer
  • To reduce the amount of heat transferred from the cargo and therefore reduce the amount of cargo that boils off.
  • To completely support the weight of the cargo tanks.
The IGC Code requires that the ESDS emergency shutdown valves close within 30 seconds. What is the reason for this? Select the ONE correct answer.

One correct answer

  • The valves need to close smoothly and not cause a pressure surge that would damage the pipelines.✓ Correct answer
  • That is as quickly as large valves can reasonably be expected to close.
  • It gives time for manual intervention to prevent closure in case of accidental tripping.
  • It gives time for personnel to clear the area.
What are the requirements of the IGC code for the pressure relief valves of cargo tanks? Select the ONE correct answer.

One correct answer

  • At least TWO pressure relief valves of equal capacity.✓ Correct answer
  • ONE pressure relief valve, provided that the area for venting exceeds the area of the filling line.
  • At least THREE pressure relief valves.
  • ONE main relief valve and one smaller, auxiliary relief valve.

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