Class 2 (2nd Engineer) MEKG 📅 Jul 2025

Exam Question

With Reference to Air-conditioning System onboard your vessel:

(a) Sketch and describe a 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 causes.

(ii) How these causes would be found and possible remedies. (4)

Reference Answer

### (a) High Pressure (HP) Cut-Out in a Refrigeration System
**Purpose and Location:**
The High-Pressure (HP) cut-out is a critical safety device fitted to the compressor discharge line, before the condenser. Its primary function is to protect the refrigeration system from over-pressurization. Excessive discharge pressure can lead to severe damage, including blown gaskets, fractured pipes, and catastrophic failure of the compressor or pressure vessel. It also prevents the formation of liquid refrigerant at the compressor discharge, which can damage the unit.
**Construction:**

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