ETL 1110-2-560
30 Jun 01
Table C-1
Merged Failure Rates
U.S. Army Corps of Engineers
Merged Failure Rate
6
Part Summary
per 10 Operating Hours
Failures Analyzed
Bearing, Ball, Roller
216.7
5
Bearing, Sleeve
140.9
1
Bolt
69.8
8
Bolt, Anchor
67.8
2
Brake, Electromechanical
289.1
8
Brake, Shoe
3809.0
1
Bus, Connection
374.9
1
Bushing, Cable, Electrical
225.0
1
Bushing, Sleeve
72.4
8
Bushing, Sleeve, Pressed
180.6
1
Cable, Electrical
2482.6
1
Cable, Electrical Lead, Power
47.1
2
Cable, Electrical Lead, Utility 480V
183.6
2
Cable, Wire Rope
228.9
6
Chain, Hoisting, Bicycle Type
70.4
1
Circuit Breaker
127.3
6
Clutch
329.6
1
Clutch, Friction, Power Transmittal
446.4
2
Coil
1624.6
2
Control Assembly, Electrical
70.4
3
Control Panel
117.3
1
Control Panel, Generator
442.1
1
Coupling, Rigid
57.5
1
Coupling, Shaft
75.9
3
Coupling, Tube, Hydraulic
5482.3
2
Drum, Wire Rope
173.6
1
Electrical Motor, AC
296.6
7
Electrical Motor, AC, Starter
234.8
5
Fitting, Hydraulic
1826.2
1
Gauge
123.3
2
Gear Assembly
3809.0
1
Gear, Spur
70.4
1
Hose, Hydraulic
180.6
1
Motor, Selsyn
208.7
4
Nut, Split
2379.1
1
Pin, Mechanical, Gudgeon
94.7
1
(Continued)
C-5
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