Mechanical Failure Rates for Non-Electronic Reliability
Table D.3 continued
239
Upper
2~/10 6 hr
Lower
Component or part
extreme
mean
extreme
Valves, shutoff
10.2
6.5
1.98
Valves, selector
19.7
16.0
3.70
Valves, sequence
81.0
4.6
2.10
Valves, spool
9.76
6.9
2.89
Valves, solenoid
19.7
11.0
2.27
Valves, three-way
7.41
4.6
1.87
Valves, transfer
1.62
0.5
0.26
Valves, vent and relief
15.31
5.7
3.41
Table D.4 Life-expectancy severity factor KL
Electronic
and
ElectroDynamic
Installation
All
electrical mechanical mechanical
environment
equipment equipment equipment equipment
Satellites
2.50
2.60
2.40
2.10
Laboratory computer
1.00
1.00
1.00
1.00
Bench test
0.54
0.55
0.51
0.50
Ground
0.30
0.31
0.26
0.25
Shipboard
0.19
0.21
0.17
0.15
Aircraft
0.16
0.18
0.14
0.12
Missiles
0.15
0.17
0.13
0.11
IV. CONSTANT FAILURE RATE DATA
The failure rates in Section IV are condensed from RADC non electronic
reliability
notebook, RADC-TR-85-194, October 1985, Ray E. Schafer
et al. The notation is retained from the original document. The 2 values
may be corrected using Eq. (D.3) for more severe environment than listed
in Table D.7. The environment is defined in Table D.6.