Geoscience Reference
In-Depth Information
Table 11.5 Process failures probabilistic evaluations
Severity
Occurrence
Detectability
Risk
Discretized risk
Combined risk
1
1
1
10
1
1
1
1
2
12
1
1
1
1
3
13
1
1
1
2
3
15
1
1
1
3
1
13
1
1
2
1
1
12
1
1
3
1
1
13
1
1
4
1
1
15
2
2
2
1
2
13
1
1
1
5
1
18
2
2
5
1
1
18
2
2
3
1
2
15
1
1
2
1
3
15
1
1
2
2
1
13
1
1
3
1
3
17
2
2
1
7
1
27
2
2
7
1
1
27
2
2
3
2
1
15
1
1
5
2
1
20
2
2
3
3
1
17
2
2
7
3
1
35
3
3
9
1
1
56
4
4
9
2
1
63
4
4
9
3
1
71
5
4
2
9
1
62
4
4
7
8
1
97
5
5
3
9
1
71
5
5
7
10
10
1817
5
5
It can be noticed in Table
11.5
that the probabilistic priority of the failure with
score 4 for severity and 1 for the other two criteria is higher than that of the failures
with scores 1, 2 and 3 on different criteria. This is a consequence of the probabilistic
composition taking into account the smaller variation of the vector of evaluations
according to severity. This smaller variation makes the highest values with respect
to severity more important.
In general, in this study, probabilistic composition led to results close to those of
classic FMEA, but with important divergences. This may be seen as an assurance
that the improvement resulting from taking into account random variability when
combining the evaluations can be applied without risk of large deviations from the
traditional practice.
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