FED-STD-791D
If the maximum bearing temperature has not exceeded 176.7C (350F) during this
period, proceed with the next step.
19.
Turn on test bearing heater and adjust controller to obtain the required bearing
operating temperature. Adjust bearing heater voltage to achieve consistent, but not
accelerated, temperature rise. Upon reaching the required bearing operating
temperature, the heater voltage is again adjusted to minimize the bearing temperature
variation above and below the control point.
20.
Check the three test bearing outer-race thermocouples to make sure the second
highest indicating thermocouple is connected to the West temperature controller.
However, maintain the required bearing operating temperature on the highest
indicating thermocouple connected to a temperature recorder.
21.
Adjust the test-oil heater controller to obtain the required bulk-oil temperature.
22.
Continue running until the test-oil-in temperature, bulk-oil temperature, test-bearing
temperature, and airflow to end cover are stabilized to the applicable specification
values.
Mark the level indicator tube to show the full position. All subsequent oil level
23.
checks are made in reference to this point.
24.
Take at least two separate flow checks of 1-minute duration, each at the test-oil flow
measuring system. Flow rate should be 600 20 mL/min.
25.
Measure the sump vent-gas flow at the exhaust valve and adjust the scavenge pump
motor speed to obtain 0.24 0.01 L/sec (0.5 0.2 cfm) vent-gas flow.
26.
Adjust airflow to air cooler to maintain specified test-oil return temperature.
27.
Continue running to complete the 16-hour operating period, shut down the rig in
accordance with 6.6.3 and observe a shutdown period.
6.6.2 Operating Procedure.
6.6.2.1 Record the following operational data at 30-min intervals:
a. Test hours (count from the time when the test-oil heaters are turned on until turned off).
b. Time and date.
c. Load-oil pressure.
d. Test-oil pressure.
e. Ratiotrol setting - test-oil pump.
f. Ratiotrol setting - scavenge pump.
g. Seal differential pressure - test versus support section.
h. Airflow to end cover - rotameter scale.
i. Test-bearing temperature (3 thermocouples).
j. Test-oil sump temperature.
k. Test-oil-in temperature.
l. Test-oil-out temperature - end cover side.
m. Test-oil-out temperature - seal side.
n. Test-oil return temperature.
o. Support-oil-in temperature.
p. Support-oil-out temperature.
186
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