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OPERATING THE LOG
 
A. OPERATING INSTRUCTIONS
 
3A1. Energizing the system. Turn the electrical switches controlling the 1Y, 2Y, and 3Y circuits on the interior communication (I.C.) board, and the conning tower repeater switch on the action cutout (A.C.O.) board to their ON positions.

Figure 3-1. Valves and vent cocks in secured position.

1. DYNAMIC HOSE (FROM PUMP)
2. DYNAMIC PRESSURE VALVE
3. VENT COCK
4. BYPASS VALVE
5. VENT COCK
6. STATIC PRESSURE VALVE
7. STATIC HOSE (FROM RODMETER)

Figure 3-1. Valves and vent cocks in secured position.

3A2. Opening the sea valve. Raise the deck plate above the sea valve. Turn the sea valve handwheel in a counterclockwise direction as far as possible to fully open the sea valve gate.

3A3. Venting the system. a. While submerged. When venting the underwater log system while submerged, the instructions given in Figure 3-3 should be followed. Improper venting procedure will crush the bellows mechanism or throw it out of calibration. With other procedures than that described in Figure 3-3, it is practically impossible to open or close the dynamic and static pressure valves

  simultaneously so as to keep the pressures on both sides of the bellows equal. The described procedure may also be used for surface venting.

b. When surfaced. For best results the system should be vented when the submarine is stationary. The purpose of venting the hydraulic system is to remove any air that may be trapped in the system. The following venting routine includes venting the pump. When the ship is once underway it is not necessary, to include the operation of venting the pump. However, the rest of the venting routine that applies to the valves located above the control unit should be carried out daily. Vent the pump by opening the vent cock located on the pump until a clear stream of water, free of spitting, is obtained; then close the pump vent cock (Figure 3-5). Turn the valves located above the control unit from their secured position as shown in Figure 3-1 to the venting position as shown in Figure 3-2. Keep the

Figure 3-2. Valves and vent cocks in surface venting position.

1. DYNAMIC HOSE (FROM PUMP)
2. DYNAMIC PRESSURE VALVE
3. VENT COCK
4. BYPASS VALVE
5. VENT COCK
6. STATIC PRESSURE VALVE
7. STATIC HOSE (FROM RODMETER)

Figure 3-2. Valves and vent cocks in surface venting position.
 
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Figure 3-3. Surface and submerged venting routines.
To Put Log In Operation
1. Energize 'Y' circuits
2. Open sea valve
3. With valves as shown in fig. A vent pump by turning hand motor coupling by hand.
4. Set valves as shown in fig. B until stream oof water is cleared of air.
5. Set valves as shown in fig. C and lower rodmeter.
6. After system has reached speed, follow 'modified venting routine.
Modified Venting Routine
(Starting with valves show in fig. C.
Surface Venting
1. Set valves as shown in fig. B
2. Set valves as shwoning in fig. C.
Submerged Venting
To Vent Static Side
1. Close valve F
2. Open valve A
3. Gradually open petcock D
4. Close petcock D
5. Close valve A
6. Open valve F
Valves should now be in position shown in fig. C
To Vent Dynamic Side
1. Close valve G
2. Open valve A
3. Gradually open petcock C
4. Close petcock C
5. Close valve A
6. Open valve G
Valves should now be in position shown in fig. C
To Secure Log
1. Raise rodemeter to maximum position.
2. After pump stops, set valves as shown in figure A.
3. Close sea valve and de-engergize 'Y' circuits.
Pitometer Log Corp, S1485A, December 1944
Figure 3-3. Surface and submerged venting routines.
 
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Figure 3-4. Valves and vent cocks in operating position.

1. DYNAMIC HOSE (FROM PUMP)
2. DYNAMIC PRESSURE VALVE
3. VENT COCK
4. BYPASS VALVE
5. VENT COCK
6. STATIC PRESSURE VALVE
7. STATIC HOSE (FROM RODMETER)
Figure 3-4. Valves and vent cocks in operating position.

valves in this position until a clear stream of water, free of spitting is obtained; then turn the valves to their operating position as shown in Figure 3-4.

3A4. Lowering the rodmeter. The rodmeter will be in one of two positions: the normal housed position as shown in Figure 2-6, or

Figure 3-5. Pump vent cock.
Figure 3-5. Pump vent cock.

  Figure 3-6. Rodmeter in secured position
Figure 3-6. Rodmeter in secured position
 
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the fully housed position as shown in Figure 3-6. To lower the rodmeter, turn the hoist crank counterclockwise until the rodmeter is

Figure 3-7. Valves and vent cocks operating on static head.

1. DYNAMIC HOSE (FROM PUMP)
2. DYNAMIC PRESSURE VALVE
3. VENT COCK
4. BYPASS VALVE
5. VENT COCK
6. STATIC PRESSURE VALVE
7. STATIC HOSE (FROM RODMETER)

Figure 3-7. Valves and vent cocks operating on static head.
  approximately 5 inches below its normal housed position. Keep the rodmeter in this position until the pump motor and pump are operating; then lower the rodmeter to its operating, or fully extended, position. Keep the hoses clear of projections or chain links. The rodmeter is in its operating position when the clamp and guard assembly at the top of the rodmeter is flush with the top of the sea valve extension.

3A5. Securing the log. Whenever the ship enters port, the log system is secured. Secure the system in the following manner: Turn the hoist crank in a clockwise direction until the top of the rodmeter is level with the marker plate, indicating that the tip of the rod is clear of the hull. Keep the hose clear of projections as the rodmeter is raised. The rodmeter may be raised to its fully housed, or secured, position, by turning the crank until the top of the rodmeter hits the stop at the top of the hoist. Turn the valves above the control unit to their secured position as shown in Figure 3-7. Turn the 1Y, 2Y, and 3Y switches on the I.C. board, and the conning tower repeater switch on the A.C.O. board to their OFF positions. Do not turn off the switches until the log has stopped operating.

 
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