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Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution

[+] Author Affiliations
Tomasz Tkaczyk

Technip UK Ltd., Westhill, Aberdeenshire, UK

Noel P. O’Dowd

University of Limerick, Limerick, Ireland

Kamran Nikbin

Imperial College London, London, UK

Paper No. PVP2008-61024, pp. 1243-1257; 15 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


An accurate defect assessment procedure is needed to ensure integrity of girth welded steel pipelines while avoiding unnecessary repairs. An integral part of such a procedure is an estimation scheme for the crack driving force. In this work, a modified reference stress solution was developed for the assessment of elastic-plastic pipes with surface breaking defects. For the particular case of interest (reeled offshore pipelines) the loading is phrased in terms of applied strain. The stress-based approach has therefore been extended to the case of strain/displacement control. The results obtained using the modified reference stress solution have been compared with a three-dimensional finite-element analysis. Very good agreement has been obtained. The predictions are also significantly better than those obtained from existing approaches. A comparison between the proposed method and full scale testing will be presented in a separate paper.

Copyright © 2008 by ASME



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