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9
OPERATING THE 225-POUND SERVICE
AIR SYSTEM
 
A. CUTTING IN THE 225-POUND SERVICE AIR FORE AND AFT
 
(Figure 9-1)
 
9A1. Preparation.

1. Supply high-pressure air to the two 225-pound reducers.

2. Open the supply valve to the 225-pound service air manifold at each 225-pound reducer, so that low-pressure air is being supplied to the manifold.

3. Shut all the valves on the 225-pound service air manifold.

9A2. Steps in operation.

1. Remove the locking cap from the forward service air line valve on the 225-pound service air manifold in the control room.

  2. Open the forward service air line valve.

3. Remove the locking cap from the after service air line valve on the 225-pound service air manifold in the control room.

4. Open the after service air line valve.

5. Lock open the forward service air line valve by replacing the locking cap and securing the padlock.

6. Lock open the after service air line valve by replacing the locking cap and securing the padlock.

The 225-pound service air manifold is now rigged to supply service air fore and aft.

 
60

Figure 9-1. CUTTING THE 225-POUND SERVICE AIR FORE AND AFT.

 
B. PUTTING PRESSURE IN THE FORWARD TRIM TANK
 
(Figure 9-2)
 
9B1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

  9B2. Steps in operation.

1. Open the forward trim tank blow valve on the 225-pound service air manifold in the control room.

2. Observe the forward trim tank pressure gage over the manifold, when the required pressure, is reached.

3. Shut the forward trim tank blow valve on the manifold.

 
61

Figure 9-2. PUTTING PRESSURE IN THE FORWARD TRIM TANK.

 
C. VENTING THE AFTER TRIM TANK OUTBOARD
 
(Figure 9-3)
 
9C1. Steps in operation.

1. Open the after trim tank vent valve on the after torpedo tube blow and vent manifold in the after torpedo room.

2. Turn the three-way cock on the starboard side of the after torpedo room to the vent outboard position.

3. Open the after torpedo tube outboard

  vent valve, on the starboard side of the after torpedo room.

The after trim tank is now vented outboard.

4. Shut the after torpedo tube outboard vent valve upon completion of venting.

5. Shut the after trim tank vent valve on the after torpedo tube blow and vent manifold.

 
62

Figure 9-3. VENTING THE AFTER TRIM TANK OUTBOARD

 
D. BLOWING FROM THE NO. 1 TO THE NO. 2 AUXILIARY
BALLAST TANK
 
(Figure 9-4)
 
9D1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

c. The trim system is lined up for this operation.

9D2. Steps in operation.

1. Open the auxiliary ballast tank No. 1 blow and vent stop valve on the starboard side of the crew's mess room.

2. Open the auxiliary ballast tank No. 2 blow and vent stop valve on the port side of the crew's mess room.

3. Open the auxiliary ballast tank No. 2

  vent valve on the 225-pound service air manifold in the control room.

4. Open the auxiliary ballast, tank No. 1 blow valve on the 225-pound service air manifold. Observe the pressure gage for the auxiliary ballast tank No. 1 to be sure that the required pressure is obtained.

5. Shut the auxiliary ballast tank No. 1 blow valve when the required amount of water has been transferred.

6. Shut the auxiliary ballast tank No. 2 vent valve on the 225-pound service air manifold.

7. Shut the auxiliary ballast tank No. 2 blow and vent stop valve in the crew's mess room.

8. Shut the auxiliary ballast tank No. 1 blow and vent stop valve in the crew's mess room.

 
63

Figure 9-4. BLOWING FROM THE NO. 7 TO THE NO. 2 AUXILIARY BALLAST TANK.

 
E. VENTING AUXILIARY BALLAST TANK NO. 1
 
(Figure 9-5)
 
9E1. Steps in operation.

1. Open the auxiliary ballast tank No. 1 blow and vent stop valve on the starboard side of the crew's mess room.

2. Open the auxiliary ballast tank No. 1 vent valve on the 225-pound service air manifold in the control room.

  3. Shut the auxiliary ballast tank No. 1 vent valve on the 225-pound service air manifold when venting is completed.

4. Shut the auxiliary ballast tank No. 1 blow and vent stop valve in the crew's mess room.

 
64

Figure 9-5. VENTING AUXILIARY BALLAST TANK NO. 1

 
F. BLOWING FROM THE FORWARD WRT TANK TO THE FORWARD
TRIM TANK
 
(Figure 9-6)
 
9F1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

Before air pressure can be admitted to the WRT tank, make certain that the WRT tank overflow valve is shut. This automatically opens the quick-acting WRT tank blow valve (whistle valve) to permit blowing the tank, as these two valves are interlocked and operated by the same lever. (See Figure 4-6.)

9F2. Steps in operation.

1. Open the 225-pound air supply valve to forward torpedo tube blow manifold in the forward torpedo room.

  2. Open the forward trim tank vent valve on the forward torpedo tube blow and vent manifold.

3. Turn the three-way cock, located on the starboard side forward in the forward torpedo room, to the vent inboard position.

4. Open the WRT tank blow valve on the forward torpedo tube blow and vent manifold. Observe the WRT tank air pressure gage in order not to exceed the required pressure.

5. Shut the WRT tank blow valve on the forward torpedo tube blow and vent manifold when the required amount of water has been transferred.

6. Shut the forward trim tank vent valve on the forward torpedo tube blow and vent manifold.

7. Shut the 225-pound air supply valve to the forward torpedo tube blow and vent manifold.

 
65

Figure 9-6. BLOWING FROM THE FORWARD WRT TANK TO THE FORWARD TRIM TANK.

 
G. BLOWING FROM THE FORWARD TRIM TANK TO THE
AFTER TRIM TANK
 
(Figure 9-7)
 
9G1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

c. The trim system is lined up for this operation.

9G2. Steps in operation.

1. Open the after trim tank vent valve

  on the 225-pound service air manifold in the control room.

2. Open the forward trim tank blow valve on the 225-pound service air manifold. Observe the forward trim tank pressure gage so as not to exceed the required pressure.

3. Shut the forward trim tank blow valve on the 225-pound service air manifold when the required amount of water has been transferred.

4. Shut the after trim tank vent valve on the 225-pound service air manifold.

 
66

Figure 9-7. BLOWING FROM THE FORWARD TRIM TANK TO THE AFTER TRIM TANK.

 
H. BLOWING FROM THE AUXILIARY BALLAST TANK NO. 2
TO THE FORWARD TRIM TANK
 
(Figure 9-8)
 
9H1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

c. The trim system is lined up for this operation.

9H2. Steps in operation.

1. Open the forward trim tank vent valve on the 225-pound service air manifold in the control room.

2. Open the auxiliary ballast tank No. 2

  blow and vent stop valve, port side of the crew's mess room. 3. Open the auxiliary ballast tank No. 2 blow valve on the 225-pound service air manifold. Observe the pressure gage for auxiliary ballast tank No. 2, in order not to exceed the required pressure.

4. Shut the auxiliary ballast tank No. 2 blow valve on the 225-pound service air manifold when the required amount of water has been transferred.

5. Shut the auxiliary ballast tank No. 2 blow and vent stop valve in the crew's mess room.

6. Shut the forward trim tank vent valve on the 225-pound service air manifold.

 
67

Figure 9-8. BLOWING FROM THE AUXILIARY BALLAST TANK NO. 2 TO THE FORWARD TRIM TANK.

 
I. BLOWING FROM THE FORWARD WRT TANK TO THE
NO. 2 TORPEDO TUBE
 
(Figure 9-9)
 
9I1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

Before air pressure is admitted to the WRT tank, make certain that the WRT overflow valve is shut. (See Figure 4-5.) This automatically opens the quick-acting WRT tank blow valve (whistle valve) to permit blowing the tank. These two valves are interlocked and operated by the same lever.

9I2. Steps in operation.

1. Open the No. 2 torpedo tube vent valve on the torpedo tube blow and vent manifold in the forward torpedo room.

2. Turn the three-way cock, located on the port side of the forward torpedo room, to the vent inboard position.

3. Open the No. 2 torpedo tube drain valve on the torpedo tube drain manifold.

  4. Open the torpedo tube drain stop valve to WRT tank.

5. Open the 225-pound air supply valve to the forward torpedo tube blow and vent manifold in the forward torpedo room.

6. Open the WRT tank blow valve on the torpedo tube blow and vent manifold. Observe the WRT tank pressure gage in order not to exceed the required pressure.

(Water is now being transferred to the No. 2 torpedo tube.)

7. Shut the WRT tank blow valve on the torpedo tube blow and vent manifold when the column gage on the torpedo tube shows that the tube is full.

8. Shut the No. 2 torpedo tube vent valve on the torpedo tube blow and vent manifold.

9. Shut the No. 2 torpedo tube drain valve on the torpedo tube drain manifold.

10. Shut the torpedo tube drain stop valve to the WRT tank.

11. Shut the 225-pound air supply valve to the forward torpedo tube blow and vent manifold in the forward torpedo room.

 
68

Figure 9-9. BLOWING FROM THE FORWARD WRT TO THE NO. 2 TORPEDO TUBE.

 
J. BLOWING FROM THE NO. 8 TORPEDO TUBE TO THE
AFTER WRT TANK
 
(Figure 9-10)
 
9J1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

9J2. Steps in operation.

1. Open the after WRT tank vent valve on the torpedo tube blow and vent manifold in the after torpedo room.

2. Turn the three-way cock, on the starboard side of the torpedo room, to the vent inboard position.

3. Open the after torpedo tube drain stop valve to the WRT tank.

4. Open the No. 8 torpedo tube drain valve on the torpedo tube drain manifold.

5. Open the 225-pound air supply valve

  to the after torpedo tube blow and vent manifold in the after torpedo room.

6. Open the No. 8 torpedo tube blow valve on the torpedo tube blow and vent manifold. Observe the No. 8 torpedo tube pressure gage in order not to exceed the required pressure. (Water is now being transferred to the WRT tank.)

7. Shut the No. 8 torpedo tube blow valve on the torpedo tube blow and vent manifold when the column gage on the torpedo tube shows that the tube is empty.

8. Shut the No. 8 torpedo tube drain valve on the torpedo tube drain manifold.

9. Shut the after torpedo tube drain stop valve to the WRT tank.

10. Shut the after WRT tank vent valve on the torpedo tube blow and vent manifold.

11. Shut the 225-pound air supply valve to the after torpedo tube blow and vent manifold.

 
69

Figure 9-10. BLOWING FROM THE NO. 8 TORPEDO TUBE TO THE AFTER WRT TANK.

 
K. BLOWING FROM THE NO. 6 TORPEDO TUBE TO THE FORWARD
TRIM TANK BY WAY OF THE FORWARD WRT TANK
 
(Figure 9-11)
 
9K1. Preparations.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

9K2. Steps in operation.

1. Open the forward trim tank vent valve on the torpedo tube blow and vent manifold in the forward torpedo room.

2. Turn the three-way cock on the starboard side of the forward torpedo room to the vent inboard position.

3. Open the No. 6 torpedo tube drain valve on the torpedo tube drain manifold.

4. Open the forward torpedo tube drain stop valve to the WRT tank.

5. Open the forward WRT tank overflow valve.

6. Open the 225-pound air supply valve to the forward torpedo tube blow and vent manifold.

  7. Open the No. 6 torpedo tube blow valve on the forward torpedo tube blow and vent manifold. Observe the No. 6 torpedo tube pressure gage in order not to exceed the required pressure.

(Assuming the WRT tank is full, water is now being transferred from the torpedo tube through the WRT tank and into the forward trim tank.)

8. Shut the No. 6 torpedo tube blow valve when the column gage on the torpedo tube shows that the tube is empty.

9. Shut the No. 6 torpedo tube drain valve on the torpedo tube drain manifold.

10. Shut the forward torpedo tube drain stop valve to the WRT tank.

11. Shut the forward WRT tank overflow valve.

12. Shut the 225-pound air supply valve to the forward torpedo tube blow and vent manifold.

13. Shut the forward trim tank vent valve on the forward torpedo tube blow and vent manifold.

 
70

Figure 9-11. BLOWING FROM THE NO. 6 TORPEDO TUBE TO THE FORWARD TRIM TANK BY WAY OF THE
FORWARD WRT TANK.

 
L. PUTTING THE NO. 4 FRESH WATER TANK ON SERVICE
 
(Figure 9-12)
 
9L1. Preparation.

1. Rig the 22 5-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b, There is 225-pound air in the forward and after service air lines.

9L2. Steps in operation.

1. Open the 225-pound service air valve to the 12-pound reducer in the control room.

2. Open the 12-pound service air valve from the reducer in the control room.

3. Open the No. 4 fresh water tank blow valve in the control room.

  The No. 4 fresh water tank is now under 12-pound pressure and is on service provided the proper fresh water system connections are made.

9L3. Taking the No. 4 fresh water tank off service.

1. Shut the No. 4 fresh water tank blow valve.

2. Open the No. 4 fresh water tank vent valve to release pressure from the tank.

3. Shut the No. 4 fresh water tank vent valve when the gage shows that the pressure is relieved.

4. Shut the 12-pound service air valve from the reducer.

5. Shut the 225-pound service air valve to the 12-pound reducer.

 
71

Figure 9-12. PUTTING THE NO. 4 FRESH WATER TANK ON SERVICE

 
M. PUTTING THE NO. 2 BATTERY WATER TANK ON SERVICE
 
(Figure 9-13)
 
9M1. Preparation.

1. Rig the 225-pound service air manifold. (See Section 9A.)

2. This results in the following:

a. The forward and after service air line valves on the 225-pound service air manifold are locked open.

b. There is 225-pound air in the forward and after service air lines.

9M2. Steps in operation.

1. Open the 225-pound service air valve to the 8-pound reducer in the forward battery room.

2. Open the 8-pound service air valve from the reducer to the forward group of battery water tanks.

3. Open the No. 2 and No. 4 battery water tanks blow valve.

4. Open the No. 2 battery water tank blow valve.

  The No. 2 battery water tank is now under 8-pound pressure and is on service provided the proper battery water system connections are made.

9M3. Taking the No. 2 battery water tank off service.

1. Shut the No. 2 and No. 4 battery water tanks blow valve.

2. Open the No. 2 and No. 4 battery water tanks vent valve in the forward battery room to release pressure from the No. 2 tank.

3. Shut the No. 2 and No. 4 battery water tanks vent valve when the pressure gage at the tank indicates zero pressure.

4. Shut the No. 2 battery water tank blow valve.

5. Shut the 8-pound service air valve from the reducer to the forward group of battery water tanks.

6. Shut the 225-pound service air valve to the 8-pound reducer.

 
72

Figure 9-13. PUTTING THE NO. 2 BATTERY WATER TANK ON SERVICE.

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