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5
DRAIN OPERATIONS
 
A. PUMP FROM FORWARD TORPEDO ROOM BILGES TO EXPANSION TANK WITH DRAIN PUMP
 
1. Open the forward bilge sump suction valve in the forward torpedo room.

2. Open the drain line forward stop valve in the pump room.

3. Open the drain pump suction valve.

4. Open the drain pump discharge valve to the compensating system. (The compensating water main leads to the top of the expansion tank through valves normally locked OPEN as shown in Figure 5-1.)

5. Start the drain pump.

6. Observe the drain pump indicator lamps to determine whether the water in the drain pump air chambers is at the proper level (see Sections 3B2 and 3B5).

The water is at the proper level when only the lower light marked DRAIN PUMP. LOW is ON.

When both lights are ON, the water level is too high. Admit additional air into the air chambers by means of the 225-pound air connection to the drain pump.

  When both lights are OUT, the water level is too low. Expel some air from the air chambers by means of the vent valve on the drain pump.

7. After the forward bilge has been emptied, open the middle bilge sump suction valve at the after end of the torpedo room.

8. Shut the forward bilge sump suction valve in the forward torpedo room.

9. After the middle bilge has been emptied, open the after bilge sump suction valve at the after end of the torpedo room.

10. Shut the middle bilge sump suction valve.

11. Stop the drain pump when the after bilge has been emptied.

12. Shut the drain pump suction valve.

13. Shut the drain pump discharge valve to the compensating system.

14. Shut the drain line forward stop valve.

15. Shut the after bilge sump suction valve at the after end of the torpedo room.

 
41

Figure 5-1. PUMP FROM FORWARD TORPEDO ROOM BILGES TO EXPANSION TANK WITH DRAIN PUMP
 
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B. PUMP FROM PUMP ROOM BILGES TO SEA WITH DRAIN PUMP
 
1. Open the forward bilge sump suction valve in the pump room.

2. Open the drain pump suction valve.

3. Open the stop check valve and sea valve on the drain pump overboard discharge line.

4. Start the drain pump.

5. Observe the drain pump indicator lamps to determine whether the water in the drain pump air chambers is at the proper level (see Sections 3B2 and 3B5).

The water is at the proper level when only the lower light marked DRAIN PUMP LOW is ON.

When both lights are ON, the water level is too high. Admit additional air into the air chambers by means of the 225-pound air connection to the drain pump.

When both lights are OUT, the water level is too low. Expel some air from the air

  chambers by means of the vent valve on the drain pump.

6. When the forward bilge has been emptied, open the middle bilge sump suction valve in the pump room.

7. Shut the forward bilge sump suction valve.

8. When the middle bilge has been emptied, open the after bilge sump suction valve in the pump room.

9. Shut the middle bilge sump suction valve.

10. Stop the drain pump when the after bilge has been emptied.

11. Shut the drain pump suction valve.

12. Shut the stop check valve and sea valve on the drain pump overboard discharge line.

13. Shut the after bilge sump suction valve in the pump room.

 
42

Figure 5-2. PUMP FROM PUMP ROOM BILGES TO SEA WITH DRAIN PUMP.
 
42

 
C. PUMP FROM FORWARD TORPEDO ROOM BILGES TO SEA WITH DRAIN PUMP
 
1. Open the forward bilge sump suction valve in the forward torpedo room.

2. Open the drain line forward stop valve in the pump room.

3. Open the drain pump suction valve.

4. Open the stop check valve and sea valve on the drain pump overboard discharge line.

5. Start the drain pump.

6. Observe the drain pump indicator lamps to determine whether the water in the drain pump air chambers is at the proper level (see Sections 3B2 and 3B5).

The water is at the proper level when only the lower light marked DRAIN PUMP LOW is ON.

When both lights are ON, the water level is too high. Admit additional air into the air chambers by means of the 225-pound air connection to the drain pump.

When both lights are OUT, the water level is too low. Expel some air from the air

  chambers by means of the vent valve on the drain pump.

7. After the forward bilge has been emptied, open the middle bilge sump suction valve at the after end of the torpedo room.

8. Shut the forward bilge sump suction valve in the forward torpedo room.

9. After the middle bilge has been emptied, open the after bilge sump suction valve at the after end of the torpedo room.

10. Shut the middle bilge sump suction valve.

11. Stop the drain pump when the after bilge has been emptied.

12. Shut the drain pump suction valve.

13. Shut the stop check valve and sea valve on the drain pump overboard discharge line.

14. Shut the drain line forward stop valve.

15. Shut the after bilge sump suction valve at the after end of the torpedo room.

 
49

Figure 5-3. PUMP FROM FORWARD TORPEDO ROOM BILGES TO SEA WITH DRAIN PUMP.
 
43

 
D. PUMP WATER FROM COLLECTING TANK TO EXPANSION TANK WITH DRAIN PUMP
 
1. Unlock and open the drain pump suction valve from the collecting tank located in the after engine room. This valve normally is locked SHUT.

2. Open the drain suction stop check valve from the collecting tank.

3. Open the drain line aft stop valve in the pump room.

4. Open the drain pump suction valve.

5. Open the drain pump discharge valve to the compensating system. (The compensating water main leads to the top of the expansion tank through valves normally locked OPEN as shown in Figure 5-4.)

6. Start the drain pump.

7. Observe the drain pump indicator lamps to determine whether the water in the drain pump air chambers is at the proper level (see Sections 3B2 and 3B5).

The water is at the proper level when only the lower light marked DRAIN PUMP LOW is ON.

  When both lights are ON, the water level is too high. Admit additional air into the air chambers by means of the 225-pound air connection to the drain pump.

When both lights are OUT, the water level is too low. Expel some air from the air chambers by means of the vent valve on the drain pump.

8. When the water has been transferred, stop the drain pump. When all water has been pumped out, the liquidometer gage-will show the collecting tank filled with fuel.

9. Shut the drain pump suction valve.

10. Shut the drain pump discharge valve to the compensating system.

11. Shut the drain line aft stop valve in the pump room.

12. Shut the drain suction stop check valve from the collecting tank in the after engine room.

13. Shut and lock the drain pump suction valve from the collecting tank.

 
44

Figure 5-4. PUMP WATER FROM COLLECTING TANK TO EXPANSION TANK WITH DRAIN PUMP.
 
44

 
E. PUMP WATER FROM COLLECTING TANK TO EXPANSION TANK WITH TRIM PUMP
 
1. Unlock and open the drain pump suction valve from the collecting tank located in the after engine room. (This valve normally is locked SHUT.)

2. Open the drain suction stop check valve from the collecting tank.

3. Open the drain line aft stop valve in the pump room.

4. Open the drain pump cross connection valve.

5. Open the trim pump suction valve on the trim manifold.

6. Open the trim pump discharge valve on the trim manifold.

7. Open the drain pump discharge valve to the trim manifold.

8. Open the drain pump discharge valve to the compensating system. (The compensating water main leads to the top of the expansion tank through valves normally locked OPEN as shown in Figure 5-5.)

9. Open the priming pump suction stop valve at the priming float valve.

10. Open the trim manifold priming vent valve leading to the priming float valve.

11. Start the priming pump. Observe the priming pump vacuum gage. If the gage reads below about 20 inches, the trim pump is not fully primed since this vacuum reading indicates the float valve is not filled with water. (The sealing water tank gage must register at least two-thirds full for effective operation of the priming pump.)

  12. Stop the priming pump when the gage reads about 20 inches, indicating high vacuum.

13. Shut the trim manifold priming vent valve.

14. Shut the priming pump suction stop valve. (Operations 9 to 14 inclusive may be omitted if the trim system is filled with water from previous use.)

15. Turn the trim pump control rheostat to the slowest speed position. Start and operate the trim pump. Adjust speed to obtain desired rate of pumping. (Effective pumping is indicated by air flow which can be felt when holding the hand over the vent on the 225-pound service air manifold and a discharge reading of the trim meter which measures flow in pounds. If there is no flow, repeat priming operation.)

16. When the water has been transferred, stop the trim pump.

17. Shut the trim pump suction valve on the trim manifold.

18. Shut the trim pump discharge valve on the trim manifold.

19. Shut the drain pump discharge valve on the trim manifold.

20. Shut the drain pump discharge valve to the compensating system.

21. Shut the drain pump cross connection valve.

22. Shut the drain line aft stop valve.

23. Shut the drain suction stop check valve from the collecting tank.

24. Shut and lock the drain pump suction valve from the collecting tank.

 
45

Figure 5-5. PUMP WATER FROM COLLECTING TANK TO EXPANSION TANK WITH TRIM PUMP.
 
45

 
F. PUMP FROM POPPET VALVE DRAIN TANK TO SEA WITH DRAIN PUMP
 
1. Open the poppet valve drain tank suction valve on the drain manifold in the forward torpedo room.

2. Open the drain line forward stop valve in the pump room.

3. Open the drain pump suction valve.

4. Open the stop check valve and sea valve on the drain pump overboard discharge line.

5. Start the drain pump.

6. Observe the drain pump indicator lamps to determine whether the water in the drain pump air chambers is at the proper level (see Sections 3B2 and 3B5).

The water is at the proper level when only the lower light marked DRAIN PUMP LOW is ON.

  When both lights are ON, the water level is too high. Admit additional air into the air chambers by means of the 225-pound air connection to the drain pump.

When both lights are OUT, the water level is too low. Expel some air from the air chambers by means of the vent valve on the drain pump.

7. Stop the drain pump when the poppet valve tank has been emptied.

8. Shut the drain pump suction valve.

9. Shut the stop check valve and sea valve on the drain pump overboard discharge line.

10. Shut the drain line forward stop valve in the pump room.

11. Shut the poppet valve drain tank suction valve.

 
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Figure 5-6. PUMP FROM POPPET VALVE DRAIN TANK TO SEA WITH DRAIN PUMP.
 
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