Class 4 (4th Engineer) MEKG 📅 Sep 2025

Exam Question

Clean and dry control air is essential for efficient,troublefree operation of a ship's pneumatic ' control air system.

(a) Sketch and describe a low pressure control air systems used on board ships,showing various arrangements to deal with dust,oil and moisture.as well as safety systems. (8)

(b) Explain using a line diagram, arrangement provided, to reduce the air pressure to 7/8 bars, required for control air system. (8)

Reference Answer

### (a) Low-Pressure Control Air System: Cleaning, Drying, and Safety
A low-pressure control air system on board a ship provides clean, dry, and oil-free air at a stable pressure (typically 7-8 bar) for pneumatic control and instrumentation. The quality of this air is paramount for the reliability of automated systems. The system begins from a dedicated control air compressor or is supplied from the main air system via a pressure-reducing station.
**(A sketch as described below is required for full marks)**
**System Description and Components:**

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