Class 4 (4th Engineer) MEKG 📅 Sep 2025

Exam Question

(a) What are the Safety Devices fitted to an Air Compressor? (4)

(b) What is the Purpose of the Scum Valve on a Boiler? (4)

(d) Regarding the Emergency Bilge Injection Valve, what is its relevant size compared to the Main Sea Water Injection Valve? (4)

Reference Answer

### (a) Safety Devices fitted to an Air Compressor
The safety devices fitted to a marine reciprocating air compressor are designed to protect the machinery from over-pressure, overheating, and mechanical failure, while also preventing catastrophic events such as an air receiver explosion.
* **Relief Valves:**
* **Location:** Fitted after each stage of compression and on the shell of each intercooler and aftercooler.

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