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Probabilistic Predictions for Piping Fatigue Including the Effects of Ultrasonic Examinations

[+] Author Affiliations
F. A. Simonen

Pacific Northwest National Laboratory, Richland, WA

Paper No. PVP2003-2033, pp. 115-120; 6 pages
doi:10.1115/PVP2003-2033
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Flaw Evaluation, Service Experience, and Reliability
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4154-5
  • Copyright © 2003 by ASME

abstract

This paper presents a methodology for estimating failure probabilities of piping welds that experience cyclic stresses and that are subject to ultrasonic examinations designed to detect growing fatigue cracks. Fatigue cracks can start as either preexisting fabrication flaws or as cracks initiated after an accumulation of stress cycles. Low levels of cyclic stresses and/or small numbers of cycles produce low failure probabilities, with the failures caused mainly by fabrication flaws. More severe cyclic stress conditions produce higher failure probabilities, with the failures caused mainly by fatigue cracks that initiate during the life of the component. Numerical results are presented to address both crack initiation and crack growth. The calculations cover both stainless and ferritic steels, inservice inspections with different inspection intervals, and stress states with and without high levels of through-wall stress gradients. It is shown that effective inspection programs can significantly reduce failure probabilities, and that such programs require suitable NDE sensitivities and adequate inspection frequencies.

Copyright © 2003 by ASME
Topics: Fatigue , Pipes

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