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Class 4 (4th Engineer) MEKG 📅 May 2024

Exam Question

With regard to a reciprocating refrigerator compressors

(a) Sketch the mechanical shaft seal showing its component parts and how it is lubricated (8)

(b) Describe the sealing arrangement stating the materals used for the component parts (4)

(c) State the effect on the environment of the release of refrigerants into the atmosphere (4)

Exam question diagram

Reference Answer

### (a) Mechanical Shaft Seal Sketch and Lubrication
A mechanical shaft seal prevents the leakage of refrigerant from the compressor crankcase to the atmosphere where the crankshaft extends outside the casing.
**Component Parts (as would be shown on a sketch):**
1. **Crankshaft:** The rotating shaft that the seal must contain.

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