Class 4 (4th Engineer) MEP 📅 Aug 2023

Exam Question

With reference to main refrigeration plant give reason for each of the following operational irregularities and state how these are dealt with

(a) Rapid loss of lubricating oil from the crankcase of a " vee " block compressor (4)

(b) Steady "fall off" in refrigeration effect over a comparatively short period of time (4)

(d) Short cycling (4)

Reference Answer

### (a) Rapid Loss of Lubricating Oil from a 'Vee' Block Compressor
**Reason:**
A rapid loss of lubricating oil from the compressor crankcase is primarily due to oil being entrained with the refrigerant gas and carried over into the system. This phenomenon, known as "oil pumping" or "carryover," can be attributed to several underlying causes:
1. **Faulty or Inefficient Oil Separator:** The oil separator, typically located on the compressor discharge line, is designed to remove entrained oil from the hot, high-pressure refrigerant gas. Failure can occur due to:

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