TM 55-1925-285-13&P
0002 00
4. OCM Sampling/Sensor Assembly (figure 2, item 1). The sampling/sensor assembly enclosure has two
separate internal compartments. One compartment has a drain in its bottom and houses the sample and
detection subassembly, which is a wetted part. The second compartment is environmentally sealed to pro-
vide maximum protection to the electronic components within. In this compartment are the OCM control
circuits and the main indicator panel display. The primary function of the sampling/sensor assembly is to
sample and measure the amount of oil contained in OWS discharge water. It provides control signals to the
system indicators, and provides control signals to the remote relay assembly, which in turn controls the
diverter solenoid valve.
5. Diverter Solenoid Valve (figure 2, item 2). This motor actuated valve directs the discharge flow from the
OWS. When discharge oil levels are below the selected limit, the valve directs flow overboard. When
discharge oil levels are above the selected limit, the valve directs flow to the OWT. The valve fails to the
OWT position if power or the control signal is lost.
6. OWS Pump Motor (figure 2, item 3). This electric motor drives the OWS discharge pump. The motor is
controlled from the oily waste control panel.
7. OWS Pump (figure 2, item 4). The OWS pump is a long-coupled progressing cavity pump mounted on the
aft side of the OWS tank and is used for effluent discharge and inlet suction. The pump has a castiron
housing with stainless steel rotor, Buna-N stator, and carbon-ceramic mechanical seal. The pump is driven
by the OWS pump motor.
8. OCM Remote Relay Panel (figure 2, item 5). The remote relay panel contains a relay circuit that controls the
operation of a diverter solenoid valve in response to a control (alarm) signal received from the sampling/
sensor assembly. The diverter solenoid valve control relay has a 60 second time delay, controlled by a solid-
state timer in this assembly. There are no indicators on this unit.
9. Oily Waste Control Panel (figure 2, item 6). OWS control components are enclosed in an enclosure mounted
on the aft side of the OWS tank. Appropriate safety features (i.e., safety interlock and fuses) are included on
the inner panel. The outer panel contains the control switch (with AUTO, OFF, and MAN positions), a POWER
AVAILBALE indicator light, and an OIL DISCHARGE indicator light.
DIFFERENCES BETWEEN MODELS
At the time of issue for this manual, only hull numbers LT-803 and LT-806 have received the OCM installation.
There are no differences between models in these two installations. As other vessels are upgraded, this manual
will be revised to reflect those installations. Differences between models, if any, will be identified at that time.
EQUIPMENT DATA
Tables 1 and 2 below detail the technical characteristics of the OWS (table 1) and OCM (table 2).
0002 00-4
