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Statistical Considerations for Determining Extent of Piping Inspections for RBI or API-570 Driven Inspections

[+] Author Affiliations
D. Hobbs, A. P.-D. Ku

ABS Consulting, Inc., Houston, TX

Paper No. PVP2002-1387, pp. 167-172; 6 pages
doi:10.1115/PVP2002-1387
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Selected Topics on Aging Management, Reliability, Safety and License Renewal
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4655-5
  • Copyright © 2002 by ASME

abstract

This paper outlines a method for calculating the number of inspection locations for process piping inspections. The method determines the number of piping inspection locations required for an inspection to detect a particular damage state within the confidence limits of the premised inspection’s reliability. It is intended to be used for piping inspections per API-570, “Piping Inspection Code” and in the application of risk-based inspection concepts presented in AP1-581, “Risk Based Inspection, Base Resource Document”. This method combines recognized inspection and piping engineering practices and random-field statistical tools to calculate the number of inspection locations in piping systems with probabilistic confidence level. This method has provisions for future applications when inspection data is known, or there is greater uncertainty in the distribution of the degradation or the reliability of the inspection data is different than those premised in this paper.

Copyright © 2002 by ASME

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