1-13. OIL-WATER
TM 55-2090-201-14&P
Following processing through the second stage
water enters the third stage.
Processing is the same as the first two stages
except the third stage has a manual oil dis-
charge valve instead of a solenoid operated
valve.
Very little oil will accumulate in the
third stage.
Most, if not all of the oil, will
have been removed in the first two stages.
(5) Controls for the type A and B separators are on a re-
mote control panel.
An off-on switch controls automatic operation of
the mini-probes and solenoid valves.
An off-on switch operates the
supply pump motor.
A monitor switch is provided for future use.
Indicator lights show whether the switches are on or off.
(6) There are three additional display lights. One is an
overboard indicator light.
This light shows that the oil discharge
valve is open when oil is being pumped out.
There are two oil dump
lights.
Each of these includes a button for manual oil discharge from
the first or second stage.
They are also used for testing the oil
level mini-probe circuit.
(7) Also mounted on the control panel are four pressure
gauges.
These gauges read O-100 psi.
One gauge shows the pressure at
the inlet to the prefilter primary separator.
The other three gages
show the pressure at the discharge side of each of the three stages.
(8) The pressure vessels are made of carbon steel. They
are frame mounted.
Each vessel has a cam bar secured cover.
Filter
elements may be replaced by removing this cover.
An air eliminator
valve on each unit vents air out of the separator as fluid enters.
Zinc anodes in the bottom of each vessel cut down the effects of
electrolysis on the tanks.
(9) Sight glasses on each unit show the oil level and
water clarity.
Elbows into which each of the sight glasses is fitted
are self-sealing.
This prevents leakage if a sight glass breaks.
(10) Each separator has a combination water sample/drain
valve.
This permits draining each vessel or draining samples if
needed.
(11) Each vessel has a manual or automatic oil discharge
valve.
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