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CD0104. Use of Nitrogen (Chemical tanker)

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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 — CD0104. Use of Nitrogen (Chemical tanker)” contains 109 questions across 1 collection.

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Sample questions and answers

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By injecting nitrogen into the shore pipeline during the loading process, which of the following advantages may be obtained?

One correct answer

  • The requirement to pre-inert is much reduced.✓ Correct answer
  • The need to pre-inert is avoided entirely.
  • The need to monitor nitrogen levels after loading is eliminated.
  • Loading can take place at a higher rate.
Inert gas drawn from an in-line unit in the main or auxiliary boiler exhaust, cannot normally be used in chemical tanker operations because:

One correct answer

  • The gas will be above the LEL.
  • SOLAS requires this type of generator to be fitted only on oil tankers.
  • It will be laden with hydrocarbons and soot particles that would have a significant negative impact on the cargo quality.✓ Correct answer
  • MARPOL Annex II prohibits tank washing direct to sea after inerting with such gases.
Any operation involving nitrogen must be governed by an appreciation of:

One correct answer

  • Tank capacity measured against nitrogen supply rate.
  • Liquid flow in versus liquid flow out.
  • Rate of nitrogen supply measured against cargo pump capacity.
  • Rate of nitrogen flow in versus capacity of venting system out.✓ Correct answer
The illustration shows a compressed air supply rigged to blow a pipeline. Click on the correct sequence to ensure no back-flow of product occurs when commencing blowing the line.

One correct answer

  • supply valve / drain-cock / manifold valve✓ Correct answer
  • supply valve / manifold valve/ drain-cock
  • drain-cock / manifold valve / supply valve
  • manifold valve / drain-cock / supply valve
Click on the boxes to indicate the two types of shipboard nitrogen generator:

Multiple correct answers

  • Membrane separator.✓ Correct answer
  • Pressure separator.
  • Comparative isolator.
  • Pressure-swing adsorption.✓ Correct answer

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