Weibull Database |
Weibull databases require considerable use of engineering judgment
for meaningful application of the facts stored in database format. Do not apply the data blindly without understanding the
specific situation, as this database is solely intended for educational
purposes.
Data, described in this database, are very general. The facts are broad as is usually found in engineering references. Typical values are given for a specific case which may not be applicable for each condition envisioned by the end user of the database as exceptions always exist. Therefore you are the sole responsible individual for use of this table--Barringer & Associates, Inc. assumes no liability for your use/misuse of these tables in any manner either obvious or implied.
Item |
Beta Values |
Eta Values |
||||
|
|
(Weibull Shape
Factor) |
(Weibull
Characteristic Life--hours) |
||||
|
Low |
Typical |
High |
Low |
Typical |
High |
|
|
Components |
|
|
|
My engineering judgment does
not support the range of a few values shown in published databases
|
||
|
0.7 |
1.3 |
3.5 |
14,000 |
40,000 |
250,000 |
|
|
Roller bearings |
0.7 |
1.3 |
3.5 |
9,000 |
50,000 |
125,000 |
|
Sleeve bearing |
0.7 |
1 |
3 |
10,000 |
50,000 |
143,000 |
|
Belts, drive |
0.5 |
1.2 |
2.8 |
9,000 |
30,000 |
91,000 |
|
Bellows, hydraulic |
0.5 |
1.3 |
3 |
14,000 |
50,000 |
100,000 |
|
Bolts |
0.5 |
3 |
10 |
125,000 |
300,000 |
100,000,000 |
|
Clutches, friction |
0.5 |
1.4 |
3 |
67,000 |
100,000 |
500,000 |
|
Clutches, magnetic |
0.8 |
1 |
1.6 |
100,000 |
150,000 |
333,000 |
|
Couplings |
0.8 |
2 |
6 |
25,000 |
75,000 |
333,000 |
|
Couplings, gear |
0.8 |
2.5 |
4 |
25,000 |
75,000 |
1,250,000 |
|
Cylinders, hydraulic |
1 |
2 |
3.8 |
9,000,000 |
900,000 |
200,000,000 |
|
Diaphragm, metal |
0.5 |
3 |
6 |
50,000 |
65,000 |
500,000 |
|
Diaphragm, rubber |
0.5 |
1.1 |
1.4 |
50,000 |
60,000 |
300,000 |
|
Gaskets, hydraulics |
0.5 |
1.1 |
1.4 |
700,000 |
75,000 |
3,300,000 |
|
Filter, oil |
0.5 |
1.1 |
1.4 |
20,000 |
25,000 |
125,000 |
|
Gears |
0.5 |
2 |
6 |
33,000 |
75,000 |
500,000 |
|
Impellers, pumps |
0.5 |
2.5 |
6 |
125,000 |
150,000 |
1,400,000 |
|
Joints, mechanical |
0.5 |
1.2 |
6 |
1,400,000 |
150,000 |
10,000,000 |
|
Knife edges, fulcrum |
0.5 |
1 |
6 |
1,700,000 |
2,000,000 |
16,700,000 |
|
Liner, recip. comp. cyl. |
0.5 |
1.8 |
3 |
20,000 |
50,000 |
300,000 |
|
Nuts |
0.5 |
1.1 |
1.4 |
14,000 |
50,000 |
500,000 |
|
"O"-rings, elastomeric |
0.5 |
1.1 |
1.4 |
5,000 |
20,000 |
33,000 |
|
Packings, recip. comp. rod |
0.5 |
1.1 |
1.4 |
5,000 |
20,000 |
33,000 |
|
Pins |
0.5 |
1.4 |
5 |
17,000 |
50,000 |
170,000 |
|
Pivots |
0.5 |
1.4 |
5 |
300,000 |
400,000 |
1,400,000 |
|
Pistons, engines |
0.5 |
1.4 |
3 |
20,000 |
75,000 |
170,000 |
|
Pumps, lubricators |
0.5 |
1.1 |
1.4 |
13,000 |
50,000 |
125,000 |
|
Seals, mechanical |
0.8 |
1.4 |
4 |
3,000 |
25,000 |
50,000 |
|
Shafts, cent. pumps |
0.8 |
1.2 |
3 |
50,000 |
50,000 |
300,000 |
|
Springs |
0.5 |
1.1 |
3 |
14,000 |
25,000 |
5,000,000 |
|
Vibration mounts |
0.5 |
1.1 |
2.2 |
17,000 |
50,000 |
200,000 |
|
Wear rings, cent. pumps |
0.5 |
1.1 |
4 |
10,000 |
50,000 |
90,000 |
|
Valves, recip comp. |
0.5 |
1.4 |
4 |
3,000 |
40,000 |
80,000 |
|
|
|
|
|
|
|
|
|
Machinery Equipment |
|
|
|
|
|
|
|
Circuit breakers |
0.5 |
1.5 |
3 |
67,000 |
100,000 |
1,400,000 |
|
Compressors, centrifugal |
0.5 |
1.9 |
3 |
20,000 |
||