FED-STD-791D
limits, it can usually be corrected by adjusting the water supply to the cooler by
means of trim valve (16).
k. Keep cabinet door closed throughout the test, opening only when necessary and
for as short periods as possible. Check and adjust operation of ventilating and
heating equipment to hold test-section air temperature at 48.9C (120 5F).
(1) Record the following data every 30 min for the duration of the test:
Oil-in temperature, C (F)
Oil-out temperature, C (F)
Coking-tube temperature, C (F)
Cabinet-air temperature, C (F)
Heater voltage
Watt-hour meter (total)
Air flow (rotameter setting and pressure), mL/min
Aerated-oil level (above or below mark), cm
Pump pressure, kPa (psig)
6.16 At the end of the 12-hour test run, shut off the coking-tube heater, and
immediately shut filler valve (29). Remove feeder flask, and empty all fresh oil from the
filler tube.
6.17 Shut off air flow.
6.18 With pump running, drain the used oil into a clean, dry container through
drain valve (37). Save used oil if optional analysis is desired.
6.19 Turn off all switches on control panel.
6.20 While the test rig is still hot and as soon after the completion of the test run,
check for sludge deposits in the filter as follows:
a. Remove the filter (see Figure 5) as a unit, and allow it to drain for 5 min with
the inlet at the top and the filter housing tilted approximately 30 from the
vertical.
b. Being careful not to dislodge sludge particles, disassemble the filter housing,
and place the screen (deposit side up) on a clean, absorbent paper towel or on a
piece of qualitative-grade filter paper.
c. After 10 min replace paper with a new one and allow screen to drain an
additional 50 min.
d. Weigh the screen and deposits to the nearest 10 mg, and record.
e. Oils with very high sludge values may leave deposits on the upstream half of the
filter housing. These deposits should be removed with petroleum ether and a
policeman, and filtered through a tared Gooch crucible. The crucible and
contents should be washed thoroughly with petroleum ether until the washings
are completely free from discoloration. The crucible and contents are than dried
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