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CHEMCO Exit Exam • Set 8 Question 13 of 30

Concurrent COW with cargo discharge: identify the precaution for the Concurrent COW method for use

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Direct Answer

Option C: COW concurrent method: The normal minimum back pressure required for the operation of the COW guns is 8 kg/cm2.

The concurrent COW method requires sufficient back pressure to operate the washing machines effectively. A minimum back pressure of 8 kg/cm² ensures proper atomization and projection of the washing fluid, critical for efficient tank cleaning and safety, as detailed in COW operation manuals.

All Options

A
COW concurrent method utilizes the crude oil stream being discharged, together with its associated back pressure, to supply the COW pipeline with crude oil.
B
COW concurrent method can be achieved either by a "bleed-off' system from the main crude oil discharge pipelines for supply to the COW pipeline or by separate supply using a designated cargo pump.
C
COW concurrent method: The normal minimum back pressure required for the operation of the COW guns is 8 kg/cm2. (Correct Answer)
D
COW concurrent method: If supply is achieved by the bleed-off from the bulk discharge, then sufficient back pressure has to be maintained at all times.

Detailed Explanation & Context

The concurrent COW method requires sufficient back pressure to operate the washing machines effectively. A minimum back pressure of 8 kg/cm² ensures proper atomization and projection of the washing fluid, critical for efficient tank cleaning and safety, as detailed in COW operation manuals.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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