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Q3. Clean and dry control air is essential for efficient trouble-free operation of a ship’s pneumatic’ control air system.

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

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