Class 4 (4th Engineer) MEKG 📅 Oct 2022

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) What are the Safety Devices fitted to an Air Compressor?
A marine air compressor is a high-pressure machine vital for engine starting, control systems, and service air. Due to the high pressures and temperatures involved, it is fitted with numerous safety devices to protect both the machinery and personnel. A comprehensive list of these devices includes:
* **Relief Valves:**
* **Location:** Fitted on the discharge side of each compression stage (e.g., after the 1st stage cooler, after the 2nd stage cooler) and on the final discharge line before the air receiver.

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