FED-STD-791D
3. Close the oil supply valve. Check the oil level in the test oil and support oil tanks. The
test oil tank should be charged with test oil at room temperature until the fluid level is
1.3 cm (1/2 in) above the baffle plate with the pressure and scavenge lines filled. This
level should be marked and will establish the "FILL" mark or the minimum operating
level during test operation. The expansion of the test oil upon heating to test conditions
will establish the "FULL" mark. The support oil tank should contain approximately 23
to 30 L (6 to 8 gal) of a MIL-L-23699 or MIL-PRF-7808 lubricating oil.
4. Insure that the test oil tank vent is open and that any vent line drain is closed.
5. Check the main air supply pressure, adjusting it if necessary to maintain a minimum of
207 gage kPa (30 psig).
6. Open water valves to dynamic and support oil cooler.
7. Check dynamic water pressure: it should be 310 gage kPa (45 psig).
8. Adjust the air pressure for the load cylinder to 207 gage kPa (30 psig).
9. Set the load valve to the zero load position (clockwise direction).
10. Add distilled water to the vapor bottle until the desired level is reached.
11. Open air bleeds on both sides of the differential manometer for the screw thread oil
seals which should be filled with test oil.
12. Record the watt hour meter readings from the test oil tank heater and bearing heater
meters. Turn on the electric power (breaker boxes) to the test oil tank heater, support
oil tank heater, test bearing heater, and the bearing drive motor.
13. Turn off automatic mode switch.
14. Turn on the following switches on the control panel:
a. Control panel power.
b. Strip chart recorder.
c. Support test oil cart power.
d. Stirrer motor.
e. Timer (adjust as necessary).
f. Test oil heater.
g. Doric.
h. Water heater.
i. Load by-pass.
When the test oil temperature reaches 121C (250F) turn on the support oil heater.
15.
The temperature controllers should be adjusted to obtain 138C (280F) and 82C
(175F) in the test oil and support oil tanks, respectively. In the test oil tank, the
maximum heater skin temperature should not exceed 29C (85F) above the test oil
tank target temperature during warmup. Higher temperatures indicate improper
electrical hookup of excessively high supply voltage which should be corrected
before continuing the test program.
When the bulk oil temperature in the test tank reaches 138C (280F) turn on the air
16.
supply to the end cover and adjust to approximately 9.9 L/min (0.35 ft3/min). Air
pressure should be held at 34.4 gage kPa (5.0 psig).
17.
Start the test oil pressure and scavenge pumps. Insure that the flow is 69 gage kPa
(10 psig) minimum at the test oil jet. The test oil flowrate is 600 " 30 mL/min.
18.
Check the oil supply valve between the test oil tank and the variable speed pressure
pump; it should be wide open.
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