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19
OPERATING THE LOG
 
A. OPERATING INSTRUCTIONS
 
19A1. Energizing the system. Turn the electrical switches controlling the 1Y, 2Y, and 3Y circuits on the I.C. (interior communication) switchboard, and the conning tower repeater switch on the A.C.O. (action cutout) switchboard to their ON positions.

19A2. 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. On some of the older ships the valve handwheel is turned clockwise to open the sea valve. Inspect the marking on the handwheel before operating the valve.

Figure 19-1. Venting routine, Step 1.
1. STATIC VENT COCK
2. STATIC SHUT-OFF VALVE
3. DYNAMIC VENT COCK
4. BYPASS VALVE
5. DYNAMIC SHUT-OFF VALVE Figure 19-1. Venting routine, Step 1.

19A3. Venting the system. Do not vent the system when the ship is submerged, as the pressures increase approximately 1/2 pound per square inch for each foot of submergence, and the mercury will be blown out of the manometer.

 

Figure 19-2. Venting routine, Step 2.
1. STATIC VENT COCK
2. STATIC SHUT-OFF VALVE
3. DYNAMIC VENT COCK
4. DYNAMIC SHUTOFF VALVE
5. BYPASS VALVE
Figure 19-2. Venting routine, Step 2.

Figure 19-3. Venting routine, Step 3.
1. PINCH STATIC HOSE
2. STATIC VENT COCK
3. STATIC SHUT-OFF VALVE
4. DYNAMIC VENT COCK
5. BYPASS VALVE
6. DYNAMIC SHUT-OFF VALVE
Figure 19-3. Venting routine, Step 3.

 
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Figure 19-4. Valves and vent cocks in operating
positions.
1. STATIC VENT COCK
2. STATIC SHUT-OFF VALVE
3. BYPASS VALVE
4. DYNAMIC VENT COCK
5. DYNAMIC SHUT-OFF VALVE
Figure 19-4. Valves and vent cocks in operating positions.

For best results the ship should be stationary. The purpose of venting the system is to remove any air that may be trapped in the lines. The venting routine should be carried out daily. The manometer should be gently rocked back and forth in its gimbals while venting to facilitate the removal of air. Vent the system as follows: Turn the valves and vent cocks as shown in Figure 19-1. When a

  full stream of water, free from spitting, is obtained from the dynamic vent cock, turn the valves and vent cocks as shown in Figure 19-2. This is a transition step in the venting routine. Turn the valves and vent cocks to the positions shown in Figure 19-3. When a full stream of water, free of spitting is obtained from the static vent cock, close the static vent cock. The system is now vented, and should be free of air. Turn the valves and vent cocks to the operating position as shown in Figure 19-4.

19A4. Lowering the rodmeter. To lower the rodmeter, turn the hoist crank counterclockwise until the rodmeter is lowered to its operating position. Keep the hose clear of projections and chain links. The rodmeter is in its operating position when the clamp and guard assembly at the top of the rodmeter is close to the sea valve extension.

19A5. Securing the log. Whenever the ship enters port the log system is secured 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 outer 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 strikes the stop at the top of the hoist.

 
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Version 1.11, 25 Feb 2005