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Flaw Evaluation at Pipe Weld Connecting Two 90° Elbows

[+] Author Affiliations
Brad Dawson, Eric Houston

Structural Integrity Associates, Inc., Centennial, CO

Robert McGill

Structural Integrity Associates, Inc., San Jose, CA

Paper No. PVP2016-63946, pp. V01AT01A008; 6 pages
doi:10.1115/PVP2016-63946
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 1A: Codes and Standards
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5035-0
  • Copyright © 2016 by ASME

abstract

ASME Code Case N-513-4 allows evaluation of flaws in elbows to be treated as straight pipe if the flaw is located within a distance √Rt from the weld centerline, provided the elbow is welded to straight pipe. In addition, N-513-4 provides guidance for evaluation of flaws in elbows when the flaw is remote from the weld, but this approach may be increasingly conservative for flaw locations closer to the weld. For the instance where a flaw evaluation is necessary at a weld adjoining a 90° elbow to another 90° elbow, it is not clear if the stress distribution would be significantly different from a weld connecting a 90° elbow to straight pipe. This paper will employ finite element models to examine the stress distribution near elbow-to-elbow welds under a moment load and compares the results to straight pipe. The results of this paper may be used as a supporting basis to modify the Code Case guidance in a future revision.

Copyright © 2016 by ASME
Topics: Pipes

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