Compressed air on ships is used for different purposes. High-pressure air of 30 bar is mainly used for the main engine starting. This high-pressure air is reduced to lower working pressures through pressure reduction valves and is used for other important purposes. One of the branches of this 7-8 bar compressed air is used as control air. The control air is a filtered branch of the service air which is made free of any moisture and oil carry-over. This controlled air is used for pneumatic controllers and is important for the operation of Marrine engine controls.
Let’s understand different components which are involved in the Air System of marine propulsion system: