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Comparison of Methods for Predicting Safe Parameters for Welding Onto In-Service Pipelines

[+] Author Affiliations
William A. Bruce, Matthew A. Boring

Edison Welding Institute, Columbus, OH

Paper No. IPC2006-10299, pp. 283-296; 14 pages
doi:10.1115/IPC2006-10299
From:
  • 2006 International Pipeline Conference
  • Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
  • Calgary, Alberta, Canada, September 25–29, 2006
  • Conference Sponsors: Pipeline Division
  • ISBN: 0-7918-4263-0
  • Copyright © 2006 by ASME

abstract

When welding onto an in-service pipeline, to facilitate a repair or to install a branch connection using the “hot tapping” technique, there are two risks that need to be considered. The first is the risk of burnthrough, where the welding arc causes the pipe wall to be penetrated allowing the contents to escape. The second is the risk of hydrogen cracking that arises from the fast cooling rates that tend to be produced by the ability of the flowing contents to remove heat from the pipe wall. Various methods exist for predicting safe welding parameters for welding onto in-service pipelines with regard to the risk of both burnthrough and hydrogen cracking. This paper reviews these methods and presents a comparison of the results for a typical in-service welding application.

Copyright © 2006 by ASME
Topics: Welding , Pipelines

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