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.
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e-mail: ttkaczyk@technip.com
e-mail: noel.odowd@ul.ie
e-mail: k.nikbin@imperial.ac.uk
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June 2009
Research Papers
Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution
Tomasz Tkaczyk,
Tomasz Tkaczyk
Senior Engineer
Offshore Engineering Division,
e-mail: ttkaczyk@technip.com
Technip
, Westhill, Aberdeenshire AB32 6TQ, UK
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Noel P. O’Dowd,
Noel P. O’Dowd
Professor
Department of Mechanical and Aeronautical Engineering, Materials and Surface Science Institute,
e-mail: noel.odowd@ul.ie
University of Limerick
, Limerick, Ireland
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Kamran Nikbin
Kamran Nikbin
Professor
Department of Mechanical Engineering,
e-mail: k.nikbin@imperial.ac.uk
Imperial College London
, London SW7 2AZ, UK
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Tomasz Tkaczyk
Senior Engineer
Offshore Engineering Division,
Technip
, Westhill, Aberdeenshire AB32 6TQ, UKe-mail: ttkaczyk@technip.com
Noel P. O’Dowd
Professor
Department of Mechanical and Aeronautical Engineering, Materials and Surface Science Institute,
University of Limerick
, Limerick, Irelande-mail: noel.odowd@ul.ie
Kamran Nikbin
Professor
Department of Mechanical Engineering,
Imperial College London
, London SW7 2AZ, UKe-mail: k.nikbin@imperial.ac.uk
J. Pressure Vessel Technol. Jun 2009, 131(3): 031409 (11 pages)
Published Online: April 29, 2009
Article history
Received:
February 24, 2008
Revised:
November 12, 2008
Published:
April 29, 2009
Citation
Tkaczyk, T., O’Dowd, N. P., and Nikbin, K. (April 29, 2009). "Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution." ASME. J. Pressure Vessel Technol. June 2009; 131(3): 031409. https://doi.org/10.1115/1.3122769
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