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Class 4 (4th Engineer) MEKG 📅 Aug 2025

Exam Question

With regard to a reciprocating refrigerator compressor:

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

(b) Describe the sealing arrangement stating the materials 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 & Lubrication
A mechanical shaft seal is a critical component in a reciprocating refrigeration compressor, designed to prevent the escape of high-pressure refrigerant gas and the ingress of air while the crankshaft is rotating. It provides a dynamic seal between the rotating shaft and the stationary compressor casing.
**Component Parts:**
1. **Stationary Seat (Mating Ring):** This is a highly polished, flat ring fitted into a recess in the compressor casing. It is sealed against the casing with a static gasket or O-ring.

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