NDLI: Probabilistic Assessment of Axial Crack-Like Flaws and Remaining Life in Onshore Pipelines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Steven, J. Polasik Maier, Clifford Jaske, Carl Lee, David
Copyright Year	2013
Abstract	The predicted failure pressure and estimated remaining life of axial crack-like flaws are two key parameters pipeline operators use to develop excavation programs and set re-assessment intervals following an assessment (in-line inspection or hydrostatic pressure test, for example). Deterministic approaches routinely use conservative input values, such as specified minimum or worst-case conditions, leading to potentially overly conservative conclusions. Probabilistic approaches, on the other hand, can account for inherent variability and provide probabilities of failure; however, there are no current approaches to define an acceptance threshold in the onshore pipeline industry. This paper discusses the probabilistic approach Det Norske Veritas (USA), Inc., (DNV) uses to assess axial crack-like flaws. DNV’s approach incorporates an inelastic fracture mechanics model in combination with Monte Carlo simulations and Paris Law fatigue crack growth to estimate the cumulative probability of failure over time. Topics include the application of this methodology for two primary cases: (1) the defect population can be described with a certain degree of confidence (in-line inspection) and (2) the defect population cannot (hydrostatic pressure test). The potential for using the methodology for determining a case-by-case acceptance threshold will also be explored.
Sponsorship	Pressure Vessels and Piping Division Nondestructive Evaluation Engineering Division
File Format	PDF
ISBN	9780791855713
DOI	10.1115/PVP2013-98044
Volume Number	Volume 6B: Materials and Fabrication
Conference Proceedings	ASME 2013 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2013-07-14
Publisher Place	Paris, France
Access Restriction	Subscribed
Subject Keyword	Fracture mechanics Simulation Pipelines Hydrostatic pressure Inspection Probability Fracture (materials) Engineering simulation Pressure Failure Fatigue cracks
Content Type	Text
Resource Type	Article

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