Engineering · Diesel — Crankcase Safety
A crankcase explosion relief valve and an oil-mist detector guard against an explosion caused by:
- AOil mist igniting from a hot spot (e.g., an overheated bearing) inside the crankcase✓ Correct
- BExcess fuel in the exhaust
- CWater in the lube oil
- DOverspeed of the engine
Explanation
A local hot spot vaporizes lube oil into a flammable mist; ignition causes a primary explosion, and an inrush of air can trigger a worse secondary one. Oil-mist detectors warn early; spring-loaded relief valves vent overpressure and reseal to keep air out.
Authority: SOLAS Chapter II-1; Modern Marine Engineer's Manual
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