To start the system from empty tanks it is necessary eight to operate the electric compressor, or to obtain air from shore or another ship via the transfer connection in the superstructure.

The electirc compressor takes free air from the maneuvering room, compresses it and discharges it bt way of a water separator and a filter either to air bank No.1 or to the manifold from which it can be distributed to other banks.

The diesel compressor requires compressed air for starting so cannot be started until sufficient pressure is available to set the starting pressure in the different compressor stages, and to start the diesel pistons. This should be about 427 psi. When started, the diesel compressor also drains air from the maneuvering room, compresses it and discharges it via the same water separator and air filter as the one used by the electric compressor.

The manifold and air bank piping is so arranged that if it is necessary to shut down the manifold to effect repairs the vessel is not without air. Air bank No.1 has a direct connection to the L.P. torpedo air manifold in the after torpedo room, from which there is another connection to the main low pressure air manifold. Air bank No.6 can be connected to either the high pressure blow manifold, to the variable tank blowing and list control manifold or both. Air bank No.8 has a direct connection to the low pressure torpedo air manifold in the forward torpedo room, which like the corresponding mainfold in the after torpedo room, has a connection to the main low pressure air manifold.