How is water and compressor oil removed from the bottom of an air storage tank?

Question

Water and compressor oil are removed from air storage tanks through a drain valve. The water and oil can damage the brakes if left to accumulate in the system. Manually operated tanks must be drained every day to remove this build-up.

Accepted Answer

A drain valve is opened to remove the water and oil from the tank.

Answer

The water and oil are siphoned out of the tank.

Answer

The water and oil are removed automatically as the brakes are used.

Answer

A sponge is used to soak up the water and oil.