Environmental Engineering Reference
In-Depth Information
Table 9.1 PDD values for different crack length ranges and different ISI
Probability of detection
Number of ISI
more than
3.5
0.5-1.5
1.5-2.5
2.5-3.5
4-9
0
0.4
0.8
1
1012
0.4
0.8
1
1
1-9th ISI
10-12th ISI
Crack length, mm
9.19
Continuous and discrete curves of probability of detection.
￿ ￿ ￿ ￿ ￿
Total effective power per annum
9.20 Number of cracks detected by ISI and effective ISI: 1) detection
probability; 2) effective detection probability; 3) ISI data.
comparison of the actual number of defects obtained by using equations
[9.10] or [9.13].
The number of actual defects, determined using PDD, is greater than
those obtained using the effective PDD. For a conservative estimate we can
the PDD instead of the effective PDD.
 
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