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A Review of Rules and Analysis Models for Interaction of LF-ERW Manufacturing Linear Features in Pipelines

[+] Author Affiliations
Hao (Andy) Li, Jonathan Prescott, Hong (Kathy) Zhang, Arturo Terron Viveros, James Ferguson

Stantec Consulting Ltd., Calgary, AB, Canada

Paper No. IPC2016-64688, pp. V001T03A042; 10 pages
  • 2016 11th International Pipeline Conference
  • Volume 1: Pipelines and Facilities Integrity
  • Calgary, Alberta, Canada, September 26–30, 2016
  • Conference Sponsors: Pipeline Division
  • ISBN: 978-0-7918-5025-1
  • Copyright © 2016 by ASME


Multiple or stacked crack-like flaws can be found at longitudinal welds on vintage low frequency (LF) ERW pipeline by inspection technologies. These features may be a result of fabrication or degradation during service. The assessment of coplanar anomalies for fitness for service requires the evaluation of interaction, coalescence, and sizing of overall depth and length for multiple and/or stacked linear features. Available industrial codes provide rules to perform interaction and multiple flaw characterization; however, in some instances these general rules may result in more features requiring repairs than is actually required for a pipeline integrity program. This paper reviews interaction rules and models for linear features developed from published codes and industrial research with the objective of identifying areas for further development.

Copyright © 2016 by ASME



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