Class 2 (2nd Engineer) MEP 📅 Dec 2024

Exam Question

A Heavy Oil purifier vibrates badly when just shutting down and coming to a stop.

Suggest some reasons for this vibration problem, when you have already made an inspection of its drive mechanism and casing and found nothing unusual. (16)

Reference Answer

Possible Reasons for Heavy Oil Purifier Vibration at Shutdown
If a Heavy Oil (HFO) purifier vibrates badly only when it's shutting down and coming to a stop, despite a normal inspection of the drive mechanism and casing, the problem likely stems from dynamic effects that are only present or magnified at low, decelerating speeds.
1. Rotor Speed and Bearing Effects
a. Passing Through Critical Speed:

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