Class 2 (2nd Engineer) MEKM 📅 Feb 2021

Exam Question

Sketch and discuss the precautions and protections that are provided to minimize the possibility of a diesel engine crank case explosion and the transmission of dangerous flame into the machinery space:

(a) By design and equipment

(b) By operating personnel

Reference Answer

(a) By design and equipment:
Bearing material should be chosen to minimize friction and heat generation. The material must have sufficient strength to handle the maximum expected load and should not readily deteriorate during service.
Shaft journal and bearing dimensions must be adequate to ensure that the permissible specific load is not exceeded.
Adequate lubricating oil should be delivered to the loaded areas to form a hydrodynamic oil film. All passages, grooves, bore reliefs, and tangential runouts in the bearings should be appropriately provided.

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