High Pressure Blow System - Description

This consists of a main and stand by supply line from the high pressure air manifold, each with its own regulating valve, which are brought together, fitted with a pressure gauge and relief valve, beyond which the piping branches and connects to four manifolds each with its own regulating valve and pressure gauge. A valve on one manifold connects via piping and a stop-check hull valve to one tank. In the amidships group, however, one valve leads to one side of one tank. The manifold are all located in the control room.

The tanks are grouped as follws on the manifolds:

After Group - MBT 1
FBT 3

Amidship Group - FBT 4
MBT 5

Forward Group - FBT 6
FBT 7
MBT 8

Buoyancy Group - Stern Buoyancy
Bow Buoyancy

The stop-check valves at the hull, the valves connecting the manifold to the tanks, and the main manifold valve for the amidship group are normally locked open.

High Pressure Blow System - Operation

Opening of the main blow valve or stand-by main blow valve, without other operation, will blow the amidship group alone. By operning the valves to the after, forward and buoyancy mainfold as desired, these may be blown in any desired combination with the amidships group.

Individual tnaks may be blown aaeparately, but to do so it is necessary to close all valves on the same mainfold which do not connect to the tank to be blown, and if the tank is not in the amidship group, close the valve to the amidships group mainfold as well.

High Pressure Torpedo Charging Air - Description

This consists, in the forward torpedo room, of a main and stand- by supply line from the high pressure air manifold, to one of which is a direct connection to one air bank, and to the other of which is a direct connection to the low pressure air manifold. These two lines are brought together and enter a manifold in the forward torpedo room which has the following connections:

a) A torpedo charging connection.

b) A connection, through a filter and reducing valve, to the anchor windless motor.

c) A Mae West filling connection.

In the after torpedo room the same dual service is provided, but there is no manifold. Instead, there is merely a lead to the torpedo charging connection.

By opening the appropriate valve on the manifold in the forward torpedo room it is possible to supply high pressure air to torpedoes, to the windless motor, or to inflate life jackets. In the after torpedo room, opening of the valve supplies air for charging torpedoes. In an energency, it is possible, in either room, to use the alternate supply from the main high pressure air manifold, or to obtain air from one air bank.

Torpedo Impulse Air

This is obtained in the forward torpedo room, from a branch on the line connecting the main high pressure manifold and the No. 7 air bank. Valves are fitted in the line which permit the No. 7 air bank to be used as a separate supply if air via the manifold is not available.

In the after torpedo room, a simlar arrangement is provide. In this case the branch comes off the line to the No. 2 air bank, which can be made to severe as an energency supply if desired.

As the torpedo air system beyond this point is a fuction of the torpedo tube operation, no further description will be provide at this point.