Tankerman · Vapor Control — Overfill / Overpressure Protection
A vapor control system connected to a vessel must include protection so that a blocked or restricted vapor line does not:
- AOver- or under-pressurize the cargo tanks (high/low pressure sensors and alarms, with detonation arresters in the vapor line)✓ Correct
- BAllow the cargo to cool
- CImprove cargo quality
- DSpeed up stripping
Explanation
Because the vapor space is now connected to shore, a blockage could over-pressurize (or, on a vapor draw, collapse) the tanks. The system requires tank overpressure/vacuum protection, high/low pressure alarms, overfill protection, and detonation arresters to stop a flame front in the connected vapor piping.
Authority: 33 CFR Part 154 Subpart E; 46 CFR 39
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