Journal of Failure Analysis and Prevention

, Volume 16, Issue 6, pp 941–950 | Cite as

Use of a Ring DWTT Specimen for Determination of Steel NDT from Pipe of Diameter Less than DN500

  • M. Ben Amara
  • J. Capelle
  • Z. Azari
  • G. Pluvinage
Tools and Techniques


It has become recognized that the drop weight tearing test (DWTT) energy better represents the ductile fracture resistance of pipe steels since it utilizes a specimen that has the full thickness of the pipe and has a fracture path long enough to reach steady-state fracture resistance. However, the API 5L code does not require it for pipe sizes less than DN500. The aim of this paper is to propose a DWTT specific to small diameter pipes based on a new specimen, the ring drop weight tearing test (RDWTT) specimen; to evaluate the transition temperature T t, DWTT and nil ductility temperature of the pipe steel API 5L X65; to introduce the transition temperature T t, DWTT in the transition temperature material master curve of the API 5L X65 steel; and to compare the prediction of the crack ductile extension in a pipe based on the RDWTT’s energy and crack tip opening angle in the case of the steel API 5L X65.


Ring specimen NDT Constraint Crack extension 


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Copyright information

© ASM International 2016

Authors and Affiliations

  • M. Ben Amara
    • 1
  • J. Capelle
    • 1
  • Z. Azari
    • 1
  • G. Pluvinage
    • 2
  1. 1.ENIMMetzFrance
  2. 2.FM.CSilly sur NiedFrance

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