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CHEMCO Exit Exam • Set 13 Question 16 of 30

You are planning to use a crude oil washing system. What precaution must be taken with the source tank for the washing machines?

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Direct Answer

Option A: At least one meter must be decanted from the source tank.

As per MARPOL Annex I and the vessel's approved Crude Oil Washing (COW) Manual, the source tank for COW must be decanted by at least one meter. This removes water and sludge, ensuring only crude oil is used for washing, which is crucial for effective cleaning and preventing static electricity hazards.

All Options

A
At least one meter must be decanted from the source tank. (Correct Answer)
B
The oil in the source tank must be sampled for compatibility.
C
The source tank must have been crude oil washed at least once in the past 150 days.
D
The inert gas system must lower the oxygen content in the source tank to a maximum of 12%.

Detailed Explanation & Context

As per MARPOL Annex I and the vessel's approved Crude Oil Washing (COW) Manual, the source tank for COW must be decanted by at least one meter. This removes water and sludge, ensuring only crude oil is used for washing, which is crucial for effective cleaning and preventing static electricity hazards.

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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