OUPV & 100-Ton Master · Uninspected Vessels
Powered ventilation of the engine and fuel-tank compartments is required on gasoline-powered vessels primarily to:
- ACool the engine
- BRemove explosive gasoline vapors before starting the engine✓ Correct
- CReduce engine noise
- DImprove fuel economy
Explanation
Gasoline vapor is heavier than air and collects in the bilge, where it can explode. Powered blowers must be run (typically four minutes) before starting to purge vapors. A 'sniff test' of the bilge before starting is good practice.
Authority: 46 CFR 25.40; 33 CFR 183
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