Tankerman · Inert Gas — P/V Breaker
The pressure/vacuum (P/V) breaker in an inert gas main protects the cargo tanks against:
- AOver-pressure and under-pressure (vacuum) beyond the tank design limits✓ Correct
- BHigh oxygen content
- CStatic electricity
- DSulfur corrosion
Explanation
The P/V breaker is a last-resort liquid-filled device that relieves excessive positive or negative pressure in the IG main, protecting tank structure if individual P/V valves fail to cope.
Authority: SOLAS Chapter II-2; ISGOTT
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