FED-STD-791D
TABLE I. Operating conditions for different severity levelsof Erdco high temperature bearing
test.
Type
Condition
1
1-1/2
2
Test oil-in temperature, C
149 " 2.5
177 " 2.5
204 " 2.5
Test tank bulk oil temperature, C
171 " 2.5
199 " 2.5
227 " 2.5
Test bearing temperature -max., C
260 " 2.5
260 " 2.5
260 " 2.5
Air flow to end cover, L/min
9.9 " 1.4
9.9 " 1.4
9.9 " 1.4
Test oil-in temperature, F
350 " 5
300 " 5
400 " 5
Test tank bulk oil temperature, F
340 " 5
390 " 5
440 " 5
Test bearing temperature -max., F
500 " 5
500 " 5
500 " 5
Air flow to end cover, CFM
0.35 " 0.05
0.35 " 0.05
0.35 " 0.05
TABLE II. Critical test items.
Minimum
Maximum,
Minimum
Maximum,
, cm
cm
, in
in
1. Dimensional tolerances
a. Test bearing outer race fit in heater
-0.00051
-0.0002
0
0
mount
b. Test bearing inner race fit in heater
-0.0020
-0.0008
mount
c. Axial run-out of front vertical face of
0.000
0.000
testbearing outer raceassembled in
rig
d. Screw type seal
0.046
0.018
2. Electrical connections
a. Test bearing heater. This is a
single wrapped 4700-W unit
which should be connected to
220-V power source.
b. Test oil tank immersion heater.
This unit is made up of three
1,500-W heaters which should
be series-connected to a 220-V
power source.
6.5 Operating conditions.
126
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