Class 4 (4th Engineer) MEKG 📅 Apr 2023

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 (4 Marks)
A marine air compressor is a high-pressure system and is fitted with several critical safety devices to protect against over-pressure, overheating, mechanical failure, and risk of explosion. A comprehensive list includes:
* **Relief Valves:** These are the primary over-pressure protection devices.
* **Location:** Fitted after each stage of compression (on intercoolers), on the aftercooler, and on the air receiver (air bottle).

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