USCG USCG Motor
Set 12 • Question #103 of 382
Launch Interactive Practice Room Additional explosion relief valves are fitted on separate spaces of the crankcase such as gear or chain cases for camshaft or similar drives when the __________.
A
gross volume of such spaces exceeds 21 cubic feet overall volume of the space exceeds 0.6 cubic meters
✓ Correct Answer
B
possibility of explosion exists due to the formation of volatile gases
C
unit is operating in extreme overload conditions
D
overall volume of the space exceeds 0.6 cubic meters
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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