Exam Question
Enumerate the probable causes of crankcase explosions and give a general description of a system designed to detect the presence of an explosive mixture in a crankcase. (16)
Class 2 (2nd Engineer)
MEP
📅 Feb 2024
Reference Answer
The development of a hotspot in the crankcase is a source of heat required to vaporise the oil and form an explosive mixture.
The hotspot in the crankcase is due to the following:
Failure of lube oil to bearing, sprockets and similar parts.
Hot gas blowing past the pistons may provide a spark sufficient to cause an explosion in the trunk-type pistons engine.
The hotspot in the crankcase is due to the following:
Failure of lube oil to bearing, sprockets and similar parts.
Hot gas blowing past the pistons may provide a spark sufficient to cause an explosion in the trunk-type pistons engine.
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