by Phillip E. Prueter, P.E. / Jul 18, 2016

In July, 2016 Phillip Prueter and Jonathon Dobis presented A Computational Study of the Creep Response of High-Temperature Low Chrome Piping with Peaked Longitudinal Weld Seams. Below is an introduction to their presentation:

  • There have been numerous failures of high-temperature, low chrome piping in the power generation and petrochemical industries
  • Several of these failures have been attributed to peaking of longitudinal weld seams.
  • Generally, local weld peaking occurs during pipe manufacturing due to angular misalignment of the rolled plate at the weld seam location
  • Many fusion-welded piping fabrication standards have no specific tolerance for longitudinal weld seam peaking; some of the high-temperature pipes that have failed in-service met the required original fabrication tolerances.
  • Depending on original heat treatment, creep damage progression is known to be accelerated by the mismatch in creep properties between the base metal, weld deposit, and heat affected zone (HAZ).
  • Local weld seam peaking can induce significant local bending stresses in the pressure boundary, and the presence of local peaking can lead to creep crack initiation and propagation, and eventual rupture of the pressure boundary.
  • An overview of some of the well-known historical low chrome piping failures is provided in this study.

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