Class 4 (4th Engineer) MEKG 📅 Mar 2023

Exam Question

(a) Name the safety devices fitted on 2-stage air compressors on ship. explain their functional purpose as well as location of fitment, using a schematic diagram (12)

(b) State the maintenance and checks carried out periodically in order to keep them efficient (4)

Reference Answer

### (a) Safety Devices on 2-Stage Air Compressors (12 Marks)
A 2-stage reciprocating air compressor is a critical piece of machinery, and its operation at high pressures and temperatures necessitates a comprehensive suite of safety devices to protect the equipment, the vessel, and personnel. The following devices are fitted:
1. **LP & HP Stage Relief Valves**
* **Location:** One relief valve is fitted on the discharge side of the Low-Pressure (LP) cylinder, before the intercooler. A second relief valve is fitted on the discharge side of the High-Pressure (HP) cylinder, before the aftercooler.

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