Environmental Engineering Reference
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P
dd
(
a
)
a
, mm
5.47
Probability of detection of defects with size
a.
P
dd
(
a
)
a
, mm
5.48
Probabilistic part of residual defectivness at the beginning
of service 1 and at the end of service of the component 2.
characteristics of non-destructive inspection in the form of the curve of
detectability of defects (Fig. 5.47).
The initial defectiveness of the pipeline was determined for each standard
defect size
N
in
(
a
) =
N
det
(
a
)/
P
dd
(
a
)
(curve 2 in Fig. 5.46) and the residual defectiveness of the pipeline after
inspection and removal (repair) of the detected defects (curve 3 in Fig.
5.46) was determined from the equation:
N
res
(
a
) =
N
in
(
a
)/
N
det
(
a
).
The residual defectiveness characteristics
N
res
(
a
) were used to determine the
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