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10
OPERATING THE 10-POUND MAIN BALLAST
TANK BLOWING SYSTEM
 
A. BLOWING ALL THE MAIN BALLAST TANKS
 
(Figure 10-1)
 
10A1. Preparation.

1. Open the 10-pound stop (gate) valves in the superstructure blowing lines leading to main ballast tanks 2A, 2B, 2C, 2D, 6A, 6B, 6C, and 6D. (The emergency vent valves and the 10-pound blow valves to the fuel ballast tanks are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

10A2. Steps in operation.

1. Open the emergency vent valve MBT No. 2A in the control room on the starboard side forward.

2. Open the emergency vent valve MBT No. 2B in the control room on the port side forward.

3. Open the emergency vent valve MBT No. 2C in the control room on the starboard side aft.

4. Open the emergency vent valve MBT No. 2D in the radio room.

5. Open the emergency vent valve MBT No. 6A in the forward engine room on the starboard side.

6. Open the emergency vent, valve MBT No. 6B in the forward engine room on the port side.

7. Open the emergency vent valve MBT No. 6C in the after engine room on the starboard side.

8. Open the emergency vent valve MBT No. 6D in the after engine room on the port side. (The valves in Steps 1 to 8 are open in rig for dive.)

9. Open the supply flapper valve on the 10-pound MBT blow manifold.

  10. Start the low-pressure blower.

11. Open the No. 1 MBT 10-pound blow valve.

12. Open the No. 2B-2D MBT 10-pound blow valve.

13. Open the No. 2A-2C MBT 10-pound blow valve.

14. Open the No. 6B-6D MBT 10-pound blow valve.

15. Open the No. 6A-6C MBT 10-pound blow valve.

16. Open the No. 7 MBT 10-pound blow valve.

17. Shut each MBT 10-pound blow valve upon completion of blowing its corresponding tank.

18. Stop the low-pressure blower.

19. Shut the supply flapper valve on the 10-pound MBT blow manifold.

20. Shut the emergency vent valve MBT No. 6D.

21. Shut the emergency vent valve MBT No. 6C.

22. Shut the emergency vent valve MBT No. 6B.

23. Shut the emergency vent valve MBT No. 6A.

24. Shut the emergency vent valve MBT No. 2D.

25. Shut the emergency vent valve MBT No. 2C.

26. Shut the emergency vent valve MBT No. 2B.

27. Shut the emergency vent valve MBT No. 2A.

 
73

Figure 10-1. BLOWING ALL THE MAIN BALLAST TANKS.

 
B. BLOWING MAIN BALLAST TANK NO. 1
 
(Figure 10-2)
 
10B1. Steps in operation.

1. Open the supply flapper valve on the 10-pound MBT blow manifold.

2. Start the low-pressure blower.

3. Open the No. 1 MBT 10-pound blow valve.

  4. Shut the No. 1 MBT 10-pound blow valve upon completion of blowing.

5. Stop the low-pressure blower.

6. Shut the supply flapper valve on the 10-pound MBT blow manifold.

 
74

Figure 10-2 BLOWING MAIN BALLAST TANK NO. 1.

 
C. BLOWING MAIN BALLAST TANKS NO. 2A-2C
 
(Figure 14-3)
 
10CI. Preparation.

1. Open the 10-pound stop (gate) valves in the superstructure blowing lines leading to main ballast tanks 2A, 2B, 2C, 2D, 6A, 6B, 6C, and 6D.

10C2. Steps in operation.

1. Open the emergency vent valve MBT No. 2A in the control room on the starboard side forward.

2. Open the emergency vent valve MBT No. 2C in the control room on the starboard side aft. (Note: Emergency vent valves are open on rig for dive.)

3. Open the supply flapper valve on the 10-pound MBT blow manifold.

  4. Start the low-pressure blower.

S. Open the No. 2A-2C MBT 10-pound blow valve.

6. Shut the No. 2A-2C MBT 10-pound blow valve upon completion of blowing.

7. Stop the low-pressure blower.

8. Shut the supply flapper valve on the 10-pound MBT blow manifold.

9. Shut the emergency vent valve MBT No. 2C.

10. Shut the emergency vent valve MBT No. 2A.

 
75

Figure 10-3. BLOWING MAIN ALL MAIN BALLAST TANKS NO. 2A-2C

 
D. BLOWING MAIN BALLAST TANKS 6B-6D
 
(Figure 10-4)
 
10D1. Preparation.

1. Open the 10-pound stop (gate) valves in the superstructure blowing lines leading to main ballast tanks 2A, 2B, 2C, 2D, 6A, 6B, 6C, and 6D.

10D2. Steps in operation.

1. Open the emergency vent valve MBT No. 6B in the forward engine room on the port side.

2. Open the emergency vent valve MBT No. 6D in the after engine room on the port side. (Note: Emergency vent valves are open on rig for dive.)

3. Open the supply flapper valve on the 10-pound MBT blow manifold.

  4. Start the low-pressure blower.

5. Open the No. 6B-6D MBT 10-pound blow valve.

6. Shut the No. 6B-6D MBT 10-pound blow valve upon completion of blowing.

7. Stop the low-pressure blower.

8. Shut the supply flapper valve on the 10-pound MBT blow manifold.

9. Shut the emergency vent valve MBT No. 6D.

10. Shut the emergency vent valve MBT No. 6B.

 
76

Figure 10-4. BLOWING MAIN BALLAST TANKS NO. 6B-6D.

 
E. CORRECTING LIST BY BLOWING THE NO. 2 AND 6 MAIN
BALLAST TANKS USING LIST CONTROL DAMPERS
 
(Figure 10-5)
 
10E1. Preparation.

1. Open the 10-pound stop (gate) valves in the superstructure blowing lines leading to main ballast tanks 2A, 2B, 2C, 2D, 6A, 6B, 6C, and 6D.

10E2. Steps in operation.

1. Open the emergency vent valve MBT No. 2A in the control room on the starboard side forward.

2. Open the emergency vent valve MBT No. 2B in the control room on the port side forward.

3. Open the emergency vent valve MBT No. 2C in the control room on the starboard side aft.

4. Open the emergency vent valve MBT No. 2D in the radio room.

5. Open the emergency vent valve MBT No. 6A in the forward engine room on the starboard side.

6. Open the emergency vent valve MBT No. 6B in the forward engine room on the port side.

7. Open the emergency vent valve MBT No. 6C in the after engine room on the starboard side.

8. Open the emergency vent valve MBT No. 6D in the after engine room on the port side. (Note: Emergency vent valves are open on rig for dive.)

9. Open the supply flapper valve on the 10-pound MBT blow manifold.

10. Start the low-pressure blower. 11. Open the No. 2B-2D MBT 10-pound blow valve.

  12. Open the No. 2A-2C MBT 10-pound blow valve.

13. Open the No. 6B-6D MBT 10-pound blow valve.

14. Open the No. 6A-6C MBT 10-pound blow valve.

(Both port and starboard tanks of the No. 2 and No. 6 groups are being blown.)

15. Shift the list control lever on the 10-pound blow manifold to starboard position to correct a port list. (This prevents air from blowing the starboard tanks while the port tanks are still being blown.)

16. Shift the list control lever to neutral position when the list is corrected.

17. Shut the MBT 10-pound blow valves upon completion of blowing.

18. Stop the low-pressure blower.

19. Shut the supply flapper valve on the 10-pound blow manifold.

20. Shut the emergency vent valve MBT No. 6D.

21. Shut the emergency vent valve MBT No. 6C.

22. Shut the emergency vent valve MBT No. 6B.

23. Shut the emergency vent valve MBT No. 6A.

24. Shut the emergency vent valve MBT No. 2D.

25. Shut the emergency vent valve MBT No. 2C.

26. Shut the emergency vent valve MBT No. 2B.

27. Shut the emergency vent valve MBT No. 2A.

 
77

Figure 10-5. CORRECTING LIST BY BLOWING THE NO. 2 AND NO. 6 MAIN BALLAST TANKS USING LIST CONTROL DAMPERS.

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