FED-STD-791D
q. Watt-hour meter, test-oil sump heater.
r. Watt-hour meter, test-bearing heater. 6.6.2.2 Take 40-mL samples of test oil from
three-way valve in scavenge line every 4 h (including warm-up time along with
endurance time).
6.6.2.3 Makeup oil should be added immediately after each 40-mL sample is taken by
adding sufficient quantity of unused test oil to bring the oil level to the full mark. Makeup oil is
not added after the sample withdrawal at 16 and 32 h. The rig is shut down at these times, and
makeup oil is added after stabilization of test conditions for the subsequent 16-hour running
period.
6.6.2.4 Test-oil-in and test-oil-out filters are replaced with clean, pre-weighed elements
during each 4-hour down period. The used filter elements are allowed to drain for 1 h at 85C
(185F), weighed, and the weight gain recorded.
6.6.3 Shutdown sequence.
a. Shut off test-bearing and sump heaters.
b. Adjust loading valve on console and reduce load pressure to 172.4 kPa gage (25 psig).
c. Continue running at these conditions until test-bearing temperature (maximum) drops to
204.4C (400F).
d. Reduce load to 68.95 kPa gage (10 psig) and shut off drive motor.
e. When drive shaft stops, shut off test-oil pumps, support-oil pumps, and heater, main
electrical and water switches, and all air valves.
6.6.4 Startup sequence.
a. Turn on rig power switches and support-oil heaters in sufficient time to attain the
82.2C (180F) temperature prior to startup.
b. Turn on multipoint temperature recorder.
c. Follow step Nos. 5 through 17 of 6.6.1.
d. Continue running until the maximum bearing temperature stabilizes within 2.8C (5F)
between successive readings taken at 2-min intervals. This stabilization normally
occurs within 20 to 30 min after starting the drive motor.
e. Follow step Nos. 19 through 22 of 6.6.1.
f. Add sufficient new oil to bring the sump level indicator to the full mark.
g. Follow step Nos. 24 through 27 of 6.6.1.
6.7 Deposit rating system.
6.7.1 Outline of method.
6.7.1.1 Deposit demerits. Bearing machine cleanliness is reported in this deposit demerit
system by the assignment of values of 0 to 20. Identify the different types and thicknesses of
deposits as follows: 0 shall designate a new or clean condition; 20 shall represent the worst
condition that could be expected.
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