ETL 1110-2-560
30 Jun 01
Table C-1 (Concluded)
U.S. Army Corps of Engineers
Merged Failure Rate
6
Part Summary
per 10 Operating Hours
Failures Analyzed
Piston, Hydraulic, Rod
70.7
2
Programmable Logic Controller
216.8
2
Pump, Hydraulic
623.5
3
Receptacle, Electrical
433.4
1
Relay
238.2
3
Relay, Contact, Brake
89.0
1
Relay, Contact, Signal
89.0
1
Roller
122.6
2
Seal
295.5
20
Seal, Oil
149.7
3
Seal, O-Ring
89.0
1
Seal, Packing
94.5
2
Shaft, Power Transmittal
62.6
1
Solenoid, Assembly
125.0
3
Solenoid, Coil
227.8
3
Solenoid, Coil, Brake
60.7
2
Switch
237.8
3
Switch, Control
180.7
6
Switch, Control, Selector
307.9
1
Switch, Interlock
329.6
1
Switch, Limit
405.9
21
Switch, Limit, Rotary
298.1
7
Switch, Micro
142.0
2
Switch, Transfer, Automatic
139.8
4
Tubing, Hydraulic
129.2
2
Valve, Hydraulic, Solenoid
1826.2
1
Valve, Pilot
142.0
1
C-6
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