NDLI: An Improvement in the Code Evaluation of Flawed Pipes

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Amy, J. Smith Keshab, K. Dwivedy
Copyright Year	2007
Abstract	ASME Code Section XI Nonmandatory Appendix C [1] formalized evaluation of flaws in piping for justification of continued service of piping components with an identified crack-like flaw. The revision of this appendix in 2004 was a significant improvement in the evaluation methodology for both flawed austenitic stainless steel and ferritic steel pipe depending upon the failure mode governed by limit load (fully plastic), elastic-plastic fracture mechanics, or linear elastic fracture mechanics. The appendix also provides a screening procedure to determine failure mechanism and a procedure for flaw modeling based on the estimated flaw size at the end of a specified evaluation period. The purpose of this paper is to propose an improvement to the limit load method applicable to screened-in carbon steel, wrought stainless steel base material, stainless steel weld material with nonflux weld, and cast products in which the ferrite content is less than twenty percent. In addition, changes in the formulation are proposed to extend the methodology to non-crack-like flaws. Both crack-like and non-crack-like circumferential flaws in the piping are analyzed to simplify formulation for flaw evaluation. The paper concludes that the proposed formulation improves efficiency of the application of Appendix C methodology for crack-like flaw and non-crack-like flaw evaluations.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	23
Ending Page	29
Page Count	7
File Format	PDF
ISBN	0791842797
DOI	10.1115/PVP2007-26205
e-ISBN	0791838048
Volume Number	Volume 1: Codes and Standards
Conference Proceedings	ASME 2007 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2007-07-22
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Fracture mechanics Stainless steel Ferrites (magnetic materials) Carbon steel Fracture (materials) Steel Pipes Modeling Stress Asme standards Failure mechanisms
Content Type	Text
Resource Type	Article

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