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 TM 55-1925-273-10-1
0079 00
NOTE
There may be up to a one-minute delay between the time when the OCM turns on and when a
numeric PPM value is displayed.
i.
The OIL CONTENT PPM (figure 15, item 6) is displayed on the Remote Indicator Assembly (figure 15, item 2) if
the ALARM LIMIT (PPM) SELECTOR switch A1S2 (figure 13, item 2) is in the REMOTE position.
j.
The Diverter Valve Position Indicator (figure 14, item 2) illuminates green (figure 14, item 3) for overboard dis-
charge and illuminates red (figure 14, item 1) for discharge to the Oily Waste Holding Tank.
NOTE
When the OCM is turned OFF, or is inactive because sample pressure is outside the operating
pressure range, the effluent diverter solenoid valve will be in its default position, recirculating
effluent to the Oily Waste Tank (OWT). When the OCM is activated by its pressure switch, it
must detect four consecutive "good" samples (at 15-second intervals) before the remote relay
assembly will send a signal to the diverter solenoid valve, diverting effluent flow overboard. If
the effluent oil concentration rises above the set alarm level for one sample, the Remote Relay
Assembly will remove the signal, causing the diverter solenoid valve to return to its default
(recirculating) position. Loss of control signal or power to the diverter solenoid valve also
causes it to return to its default position.
k.
The OCM Sample Inlet Pressure Gauge (figure 14, item 4) indicates a pressure between 5 and 25 PSI (0.3 to 1.7
bar).
l.
Monitor the effluent diverter solenoid valve (figure 12, item 4) to ensure that it is being automatically controlled by
a signal from the OCM remote relay assembly (figure 10, item 4).
NOTE
Oil Discharge from the OWS to the OWT is automatic during manual operation. When enough
oil has collected in the top of the OWS tank to cover the tip of the lower sensor probe, the OWS
will enter the oil discharge mode. The yellow OIL DISCHARGE indicator on the OWS control
panel will light and the OWS pump will stop. The OWS backflush inlet solenoid valve will
open, admitting raw water at about 12 PSI (0.8 bar) to force the oil out of the OWS tank and into
the OWT. When enough oil has been discharged that the upper sensor probe is again covered
with water, the OWS will automatically return to processing mode. The yellow OIL DISCHARGE
light will turn off, the OWS backflush inlet solenoid valve will close, and the OWS pump will
start.
14. Monitor the operation of the OWS. A temporary automatic shutdown of the OWS is normal. Do not drain the OWT
below 10 percent during normal OWS operation. Fouling of the OWS will occur.
OWS SHUTDOWN
1.
Turn the OWS control panel switch (figure 10, item 1) to the OFF position.
2.
Position OPERATION SELECTOR switch A1S1 (figure 13, item 1) to OFF.
3.
Perform OCM backflush by OPENING OCM 2 (figure 12, item 13) and CLOSING OCM 1. Continue OCM backflush
until all liquid from the OCM discharge tube (figure 13, item 4) is clear.
4.
Perform OWS manual backflush (WP 0006 00).
5.
Return all valves from table 1 to the CLOSED position.
6.
At 120V distribution panel No. 4, set the following circuit breakers to OFF:
a.
OILY WATER SEPARATOR (figure 11, item 1).
b.
OIL CONTENT MONITOR (figure 11, item 2).
END OF WORK PACKAGE
0079 00-26
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