CHEMCO Exit Exam • Set 8 Question 5 of 30

You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take?

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Direct Answer

Option B: Open the pressure control valve until the pressure increases.

If tank pressure drops below the allowable limit during discharge, opening the pressure control valve (or adjusting its setpoint) increases inert gas flow to the tank, maintaining the required positive pressure as per ISGOTT.

All Options

Cut in another IG fan to increase gas flow.

Open the pressure control valve until the pressure increases. (Correct Answer)

Open the tank isolation valve to the fully open position.

Reduce the pumping rate.

Detailed Explanation & Context

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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