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Class 4 (4th Engineer) MEP 📅 Nov 2022

Exam Question

(a) Describe working of Mechanical Shaft seal with a diagram. How working fluid leak is prevented? (8)

(b) What are the causes of Mechanical Shaft seal failure? (4)

(c) Describe the advantages and disadvantages for mechanical shaft seal usage. (4)

Exam question diagram

Reference Answer

### (a) Working of Mechanical Shaft Seal and Leakage Prevention
**1. Concept and Components**
A mechanical shaft seal is a high-precision device designed to create a running seal between a rotating shaft and a stationary housing, typically in pumps or compressors, to prevent the leakage of a working fluid. The seal operates on the principle of maintaining an extremely thin, stable fluid film between two ultra-flat, lapped faces – one rotating with the shaft and one stationary in the housing.
The primary components are:

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