USCG USCG Motor
Set 8 • Question #331 of 382
Launch Interactive Practice Room Crankcase explosion relief valves should be of the __________.
A
return seating type
✓ Correct Answer
B
spring centered type
C
spring opened type
D
duplex double acting type
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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