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CHEMCO Exit Exam • Set 8 Question 25 of 30

Which statement about inert gas pressures in a cargo tank is TRUE?

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Direct Answer

Option B: Gas pressures should be maintained at the highest permissible level throughout the discharging process.

Maintaining the highest permissible inert gas pressure throughout discharge, as per ISGOTT, prevents air ingress and maintains a non-flammable atmosphere. Excessive pressure is managed by the pressure control valve, not by reducing inert gas levels.

All Options

A
The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging.
B
Gas pressures should be maintained at the highest permissible level throughout the discharging process. (Correct Answer)
C
High gas pressures may cause pyrophoric oxidation in the tank.
D
High gas pressures may cause loss of suction when stripping.

Detailed Explanation & Context

Maintaining the highest permissible inert gas pressure throughout discharge, as per ISGOTT, prevents air ingress and maintains a non-flammable atmosphere. Excessive pressure is managed by the pressure control valve, not by reducing inert gas levels.

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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