Tankerman · Equipment — P/V Valves
A pressure/vacuum (P/V) valve on a cargo tank vent system serves to:
- APump cargo ashore
- BRelieve overpressure and prevent vacuum while limiting normal vapor release✓ Correct
- CMeasure ullage
- DInert the tank
Explanation
The P/V valve opens to relieve excess pressure (from loading or thermal expansion) and to admit gas/air to break a vacuum (during discharge or cooling), protecting the tank structure while keeping it closed during normal operations.
Authority: Tank Vessel Operations — Venting
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