Tankerman · Inert Gas — Deck Seal
The deck water seal in an inert gas system is fitted to:
- ACool the inert gas
- BPrevent backflow of hydrocarbon gas from the tanks to the machinery space✓ Correct
- CMeasure oxygen content
- DScrub sulfur from the gas
Explanation
The deck (water) seal is a non-return barrier preventing hydrocarbon vapor from flowing back from the cargo tanks toward the engine room/blowers. A mechanical non-return valve provides a second barrier.
Authority: SOLAS Chapter II-2 (inert gas systems); ISGOTT
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