HNSA Crest with photos of visitors at the ships.
8
OPERATING THE 600-POUND MAIN BALLAST
TANK BLOWING SYSTEM
 
A. RIGGING THE 600-POUND MBT BLOW MANIFOLD FOR DIVING
 
(Figure 8-1)
 
8A1. Preparation.

1. Open the MBT regulator valves at the tanks.

2. Secure the 600-pound blow manifold in the control room.

3. Rig the high-pressure manifold with both supply valves to the 600-pound MBT blow manifold open.

(The individual, FBT blow valves on the manifold are locked shut and therefore not operated since it is assumed that the fuel ballast tanks are carrying fuel.)

8A2. Steps in operation.

1. Open the MBT No. 1 blow valve on the 600-pound MBT blow manifold.

  2. Open the MBT No. 2B-2D blow valve.

3. Open the MBT No. 2A-2C blow valve.

The forward group of individual MBT blow valves is now open.

4. Open the MBT No. 6B-6D blow valve.

5. Open the MBT No. 6A-6C blow valve.

6. Open the MBT No. 7 blow valve.

The after group of individual MBT blow valves is now open.

7. Open the forward group stop check valve.

8. Open the after group stop check valve.

The 600-pound MBT blow manifold is now rigged for diving, to blow from either hammer valve.

 
51

Figure 8-1. RIGGING THE 600-POUND MBT BLOW MANIFOLD FOR DIVING.

 
B. BLOWING ALL THE MAIN BALLAST TANKS
 
(Figure 8-2)
 
8B1. Preparation.

1. Rig the 600-pound MBT blow manifold for diving.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open.

(The individual FBT blow valves on the manifold are locked shut and therefore not

  operated since the fuel ballast tanks are assumed to be carrying fuel.)

c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

8B2. Steps in operation.

1. Open the forward hammer valve. Observe the pressure gage so as not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

2. Shut the forward hammer valve upon completion of blowing.

The 600-pound MBT blow manifold is still rigged for diving.

 
52

Figure 8-2. BLOWING ALL THE MAIN BALLAST TANKS.

 
C. BLOWING THE FORWARD GROUP OF MAIN BALLAST TANKS
 
(Figure 8-3)
 
8C1. Preparation.

1. Rig the 600-pound MBT blow manifold for diving.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open.

(The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

  c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

8C2. Steps in operation.

1. Shut the after group stop check valve.

2. Open the after hammer valve. Observe the pressure gage so as not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

3. Shut the after hammer valve on completion of blowing.

4. Open the after group stop check valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
53

Figure 8-3. BLOWING THE FORWARD GROUP OF MAIN BALLAST TANKS.

 
D. BLOWING THE AFTER GROUP OF MAIN BALLAST TANKS
 
(Figure 8-4)
 
8D1. Preparation.

1. Rig the 600-pound MBT blow manifold for diving.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open. (The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

  c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

8D2. Steps in operation.

1. Shut the forward group stop check valve.

2. Open the forward hammer valve. Observe the pressure gage in order not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

3. Shut the forward hammer valve on completion of blowing.

4. Open the forward group stop check valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
54

Figure 8-4. BLOWING THE AFTER GROUP OF MAIN BALLAST TANKS.

 
E. BLOWING MAIN BALLAST TANKS NO. 2A-2C AND NO. 6A-6C
 
(Figure 8-5)
 
8E1. Preparation.

1. Rig the 600-pound MBT blow manifold for diving.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open. (The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

  8E2. Steps in operation. 1. Shut the MBT No. 1 blow valve.

2. Shut the MBT No. 2B-2D blow valve.

3. Shut the MBT No. 6B-6D blow valve. 4. Shut the MBT No. 7 blow valve.

S. Open the forward hammer valve. Observe the pressure gage in order not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

6. Shut the forward hammer valve upon completion of blowing.

7. Open the MBT No. 7 blow valve.

8. Open the MBT No. 6B-6D blow valve.

J. Open the MBT No. 2B-2D blow valve.

10. Open the MBT No. 1 blow valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
55

Figure 8-5. BLOWING MAIN BALLAST TANKS NO. 2A-2C AND 2A-2C AND NO. 6A-6C.

 
F. BLOWING MAIN BALLAST TANKS N0. 2B-2D AND NO. 6B-6D
 
(Figure 8-6)
 
8F1. Preparation.

1. Rig the 600-pound MBT blow manifold.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open.
(The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

  8F2. Steps in operation.

1. Shut the MBT No. 1 blow valve.

2. Shut the MBT No. 2A-2C blow valve.

3. Shut the MBT No. 6A-6C blow valve.

4. Shut the MBT No. 7 blow valve.

S. Open the forward hammer valve. Observe the pressure gage in order not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

6. Shut the forward hammer valve upon completion of blowing.

7. Open the MBT No. 7 blow valve.

8. Open the MBT No. 6A-6C blow valve.

9. Open the MBT No. 2A-2C blow valve.

10. Open the MBT No. 1 blow valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
56

Figure 8-6. BLOWING MAIN BALLAST TANKS NO. 28-2D AND NO. 68-6D.

 
G. BLOWING MAIN BALLAST TANK NO. 2
 
(Figure 8-7)
 
8G1. Preparation.

1. Rig the 600-pound MBT blow manifold for diving.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open.
(The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

  c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

8G2. Steps in operation.

1. Shut the after group stop check valve.

2. Shut the MBT No. 1 blow valve.

3. Open the after hammer valve. Observe the pressure gage in order not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

4. Shut the after hammer valve upon completion of blowing.

5. Open the MBT No. 1 blow valve.

6. Open the after group stop check valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
57

Figure 8-7 BLOWING MAIN BALLAST TANK NO. 2.

 
H. BLOWING MAIN BALLAST TANK N0. 7
 
(Figure 8-8)
 
8H1. Preparation.

1. Rig the 600-pound MBT blow manifold.

2. Rig the high-pressure air manifold with both supply valves to the 600-pound MBT blow manifold open. (See Section 8A.)

3. These steps result in the following:

a. The MBT regulator valves at the tanks are open.

b. The individual MBT blow valves on the 600-pound blow manifold are open.
(The individual FBT blow valves on the manifold are locked shut and therefore not operated since the fuel ballast tanks are assumed to be carrying fuel oil.)

c. The forward and after group stop check valves are open.

d. The hammer valves are shut.

  8H2. Steps in operation.

1. Shut the forward group stop check valve.

2. Shut the MBT No. 6B-6D blow valve.

3. Shut the MBT No. 6A-6C blow valve.

4. Open the after hammer valve. Observe the pressure gage in order not to exceed 600 pounds air pressure. (Either hammer valve may be used.)

5. Shut the after hammer valve upon completion of blowing.

6. Open the MBT No. 6A-6C blow valve.

7. Open the MBT No. 6B-6D blow valve.

8. Open the forward group stop check valve.

The 600-pound MBT blow manifold is still rigged for diving.

 
58

Figure 8-8. BLOWING MAIN BALLAST TANK NO. 7.

 
I. RIGGING THE HIGH-PRESSURE AIR MANIFOLD AND 600-POUND
MBT BLOW MANIFOLD FOR BLOWING FROM EITHER THE
DISTRIBUTING MANIFOLD OR THE 600-POUND
BT BLOW MANIFOLD
 
(Figure 8-9)
 
8I1. Preparation.

1. Open the MBT regulator valves at the tanks.

2. Secure the 600-pound MBT blow manifold in the control room.

3. Shut the two supply valves to the 600-pound MBT blow manifold on the upper distributing manifold in the control room.

8I2. Steps in operation.

1. Open the MBT No. 1 blow valve on the 600-pound blow manifold.

2. Open the MBT No. 2B 2D blow valve.

3. Open the MBT No. 2A-2C blow valve.

4. Open the MBT No. 6B-6D blow valve.

5. Open the MBT No. 6A-6C blow valve.

6. Open the MBT No. 7 blow valve.

  7. Open the forward group stop check valve.

8. Open the after group stop check valve.

9. Open the after hammer valve.

10. Open the supply valve to the 600-pound MBT blow manifold on the upper distributing manifold. (This leads to the forward hammer valve.)

The 600-pound MBT blow manifold is now rigged to blow from either the distributing manifold or the 600-pound MBT blow manifold as follows:

a. By operating the emergency supply valve to the 600-pound MBT blow manifold, on the high-pressure air distributing manifold; or

b. By operating the forward hammer valve at the 600-pound MBT blow manifold.

 
59

Figure 8-9. RIGGING THE HIGH-PRESSURE AIR MANIFOLD AND 600-POUND MBT BLOW MANIFOLD FOR BLOWING FROM EITHER THE DISTRIBUTING MANIFOLD OR THE 600-POUND MBT BLOW MANIFOLD.

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