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Class 4 (4th Engineer) MEKG 📅 Sep 2024

Exam Question

With regards 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 material used for the cotmponent parts (4)

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

Exam question diagram

Reference Answer

### (a) Sketch of Mechanical Shaft Seal and Lubrication
A mechanical shaft seal for a reciprocating refrigeration compressor is a critical component designed to prevent the high-pressure refrigerant gas and crankcase oil from leaking out along the rotating crankshaft where it exits the compressor casing.
**(i) Component Parts for Sketch:**
A detailed sketch should clearly label the following components arranged concentrically around the crankshaft:

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