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Class 4 (4th Engineer) MEP 📅 Mar 2023

Exam Question

(a) Describe the working of a mechanical shaft seal with a diagram. how working fluid leak is prevented? (8)

(b) What are causes of mechanical shaft seal failure? (4)

(c) Describe for mechanical shaft seal usage

(i) Advantages (2)

(ii) Disadvantages (2)

Exam question diagram

Reference Answer

### (a) Working of a Mechanical Shaft Seal and Leakage Prevention
A mechanical seal is a device used to provide a fluid-tight seal between a rotating shaft and a stationary housing, such as in a pump or compressor. Its primary function is to prevent the pumped liquid from escaping along the shaft.
#### Construction & Key Components
A typical mechanical seal consists of two main assemblies:

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