Water is present in the air. The amount will depend on the humidity of the air. When the air is compressed, and subsequently cooled in
the air receiver, the water will condense on the cold surfaces and collect in the bottom of the receiver. If not drained off regularly
this water may cause corrosion in the receiver as well as being entrained in the air leaving the receiver and causing corrosion and
subsequent jamming of main and pilot air valves. |