Q4. (a) Describe uses of compressed air onboard the ship. (6)
(b) Describe maintenance schedule of various systems on main air compressor. (6)
(c) Describe Isolation procedure of main air compressor before starting any work (4)
Q7. State the causes and remedial actions to be taken in case of the following occurring on an air compressor:
(a) Water mixed in the crankcase oil (4)
(b) LP safety valve blowing (4)
(c) Bursting disc rupture (4)
(d) Problems caused by detective piston rings (4)
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)
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