Class 4 (4th Engineer) MEKG 📅 Mar 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)

Reference Answer

### (a) Sketch of a Reciprocating Refrigerator Compressor Mechanical Shaft Seal and its Lubrication
*(As per MMD Examiner Rules, a diagram cannot be generated, but its requirement is identified. The following describes the components typically found in such a sketch and their arrangement.)*
A mechanical shaft seal for a reciprocating refrigerator compressor is critical for preventing the leakage of refrigerant and lubricating oil from the compressor crankcase along the rotating crankshaft. It typically consists of two primary sealing faces, one rotating with the shaft and the other stationary, held in contact by spring force and fluid pressure.
**Component Parts:**

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