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Class 2 (2nd Engineer) MEKG 📅 Feb 2024

Exam Question

With reference to Air-conditioning system onboard your vessel:

(a) Sketch and describe high pressure cut-out in a refrigeration system. (6)

(b) The refrigeration compressor has stopped due to operation of the h.p cut-out Explain.

(i) The possible cause. (3)

(ii) How these causes would be found and possible remedies. (3)

(c) What steps are taken if the compressor "short-cycle" on low pressure cut-out? (4)

Exam question diagram

Reference Answer

### (a) High Pressure (HP) Cut-Out: Sketch and Description
**Purpose:**
The High Pressure (HP) Cut-Out is a critical safety device fitted on the compressor discharge side of a refrigeration system. Its primary function is to protect the system components (compressor, condenser, piping) and personnel from the hazards of excessive pressure. It is a manually reset device, ensuring that any fault causing the overpressure condition is investigated and rectified before the plant can be restarted.
**Construction:**

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