Overestimating the detection capability and sizing performance of in-line inspection tools can result in overestimating pipeline reliability, and can lead to failures on previously inspected pipelines.
The performance of in-line inspection (ILI) tools represents their ability to identify and size wall loss, planar (crack-like) defects, dents, and manufacturing defects. It is represented by a number of parameters including: the probability of detection (POD), probability of correct identification, probability of false call, positive predictive value, and sizing tolerance. A realistic assessment of these parameters is essential for the effective use of ILI data to manage pipeline integrity with respect to various types of defect.
Author: Skow, Jason.
Publisher: Pipelines International, Issue 17, September, p. 42-43.
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