USCG USCG Motor
Set 8 • Question #346 of 382
Launch Interactive Practice Room Explosion relief valves on diesel engine crankcases should relieve the pressure at not more than___________.
A
0.1 bar
B
0.2 bar
✓ Correct Answer
C
1.0 bar
D
2.0 bar
USCG NMC Regulatory Explanation
Oil Mist Detectors (OMD) sample crankcase atmospheres to detect microscopic oil droplets from overheating bearings before reaching explosive concentrations. Spring-loaded relief doors relieve internal pressure pulses and reseat instantly to block fresh atmospheric oxygen.
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