FED-STD-791D
f. Strip chart recorder.
g. Flowmeter timer.
h. Doric.
7. Provide full power (220 V) to the test oil heater.
8. When the temperature of the test oil in the tank exceeds 121C (250F) turn on the
pressure and scavenge pumps. Immediately open the test oil supply valve (on the inlet
side of the pressure pump) to allow oil to draw to the pressure pump. The pump speed
should be maintained such that the pressure is a minimum of 138 gage kPa (20 psig)
and the flow is 600 " 30 mL/min.
9. Adjust the test oil heater as needed to maintain a temperature of 121C (250F) in the
test oil tank.
10. While the oil is circulating draw two samples of approximately 700 mL each and
check for debris. If the samples are clean, return them to the system. If the samples
contain debris, drain the oil and begin the flush again.
11. Circulate the oil for at least 20 min and then turn off the tank heater.
12. When the test oil tank temperature has cooled to 38C (100F), close the oil supply
valve on the inlet side of the pressure pump.
13. Turn off the following switches:
a. Pumps
b. Timer.
c. Stirrer.
d. Recorder.
e. Flowmeter.
f. Doric.
g. Support test oil cart power.
h. Control panel power.
14.
Drain the test oil tank. Take two samples of the oil (20 and 60 mL). Mark the
samples and the remaining oil:
Flush oil
B.R. Test
Test #
Oil Code (PE number)
Date
15.
After removing the two flush filters, clean and store them.
6.6.2 Preparation for test.
1. Update the strip chart recorder with the date, test number and oil code.
2. Install two preweighed filters. A fine mesh (100 mesh) filter is installed on the spray
nozzle inlet and a coarse mesh (40 mesh) filter is installed on the inlet line of the
scavenge pump.
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