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Class 4 (4th Engineer) MEP 📅 Nov 2024

Exam Question

(a) Describe working of a 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 a Mechanical Shaft Seal and Leakage Prevention
A mechanical shaft seal is a high-precision device designed to provide a dynamic seal between a rotating shaft and a stationary housing, typically in pumps, compressors, and mixers. Its primary function is to contain the process fluid within the equipment while preventing leakage to the atmosphere, even under high pressure and rotational speed.
**1. Key Components:**
A mechanical seal consists of a set of primary and secondary sealing components, along with a loading mechanism:

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