Tankerman · Equipment — P/V Valves
Pressure/vacuum (P/V) valves on cargo tank vents allow the tank to breathe while:
- AKeeping the tank wide open to atmosphere
- BMeasuring ullage
- CAdding oxygen to the tank
- DMaintaining a slight pressure/vacuum range and acting as a flame barrier path✓ Correct
Explanation
P/V valves let the tank relieve pressure when loading and admit gas to prevent vacuum when discharging, while limiting normal venting and providing protection against flame transmission with associated flame screens/arresters.
Authority: 46 CFR 39 / SOLAS II-2; ISGOTT
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