OCTCO/OCTF Exit Exam • Set 9 Question 2 of 30

What are consequences of a ballast tank vent not working during deballasting operation?

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Direct Answer

Option A: The tank de pressurization and denting of side plates.

If a ballast tank air vent / vacuum valve fails during high-rate deballasting, internal vacuum can cause tank depressurization and severe structural buckling or denting of side shell plates.

All Options

The tank de pressurization and denting of side plates. (Correct Answer)

The tanks taking in cargo vapors during loading operation.

The cargo tank alteration of ullage are taking place.

Combination of all three a,b,c

Detailed Explanation & Context

If a ballast tank air vent / vacuum valve fails during high-rate deballasting, internal vacuum can cause tank depressurization and severe structural buckling or denting of side shell plates.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).

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