Tankerman · Equipment — Pressure/Vacuum Valve Setting
The pressure/vacuum (P/V) valves on cargo tanks are set to:
- AMeasure cargo temperature
- BStay open at all times
- CAdd inert gas to the tank
- DRelieve at the tank's design pressure and vacuum, allowing controlled venting during loading/discharge while normally staying closed✓ Correct
Explanation
P/V valves protect the tank structure: they open to vent vapor when pressure reaches the set point during loading, and admit gas to relieve vacuum during discharge or cooling, while normally remaining closed to contain vapors and maintain the inert atmosphere.
Authority: SOLAS II-2; ISGOTT
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