Tankerman · Equipment — P/V Valves
Pressure/vacuum (P/V) valves on cargo tanks serve to:
- APump the cargo ashore
- BRelieve excess pressure or vacuum while normally keeping the tank closed to atmosphere✓ Correct
- CMeasure cargo level
- DInert the tank
Explanation
P/V valves protect the tank structure by venting overpressure (from loading or thermal expansion) and admitting air to relieve vacuum (during discharge), while otherwise sealing the tank to limit vapor loss.
Authority: Tank Vessel Safety (USCG topic)
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