FED-STD-791D
6.5.7.1 After the photographs are completed, a detailed visual inspection is made of these
parts to determine the average depth, coverage, and consistency and type of oil deposits, plus the
extent of abnormal metal wear on the test-bearing cage, rollers, roller pockets, and outer race.
6.6 Test Procedure.
6.6.1 Preparation for test.
1.
Turn on rig power switches.
Turn on support-oil tank heaters and set at 82.2C (180F).
2.
3.
Turn on multipoint temperature recorder.
4.
Charge the test-oil sump with 7.57 L (2 gal) measured at room temperature. The
test-oil expansion upon heating to the required sump bulk-oil temperature will
establish the "full" mark which should be noted on the level indicator tube.
Turn on test-oil heaters and adjust controller to obtain 126.7C (260F).
5.
6.
Open air bleeds on both sides of the differential manometer which is filled with test
oil.
7.
Checkloading valve on console. It should be in the open or zero-load position.
When the bulk-oil temperature in the test tank reaches 126.7C (260F), turn on the
8.
air supply to end cover and adjust to 0.165 L/sec (0.35 cfm).
9.
Start the test-oil pressure and scavenge pumps. Test-oil pressure should be at least
68.95 kPa gage (10 psig) at test-oil jet.
10.
Start the support-oil pumps.
11.
Set and maintain support-oil pressure at 551.6 to 689.5 kPa gage (80 to 100 psig).
12.
Adjust the load pressure to 68.95 kPa gage (10 psig) and start the drive motor.
13.
Increase rig speed immediately to 10,000 rpm.
14.
Close loading valve on console until 351.6 kPa gage (51 psig) is obtained on gage.
15.
Close air bleeds on both legs of manometer used for pressure differential checks
across the screw-thread seal. The required differential is controlled by maintaining a
slightly higher test-oil compartment pressure of 0.76 to 1.27 cm (0.3 to 0.5 in) of
test-oil column relative to the support-oil compartment pressure.
Continue running until the following conditions are stabilized:
16.
121.1 1.4C (250 2F)
Test-oil-in temp
126.7 2.8C (260 5F)
Test-tank bulk-oil temp
Airflow to end cover
0.165 0.01 L/sec (0.35 0.02 ftm)
17.
Make at least two separate flow checks of 1-minute duration each at the test oil flow
measuring system. The measured volume flow rate should be 600 20 mL/min.
18.
Continue running for 1 h at these conditions with the bearing heater off. If during, or
at the end of this period, the maximum bearing temperature has exceeded 176.7C
(350F), shut down the rig, install a new test bearing, and repeat steps 1 through 17.
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