Oil and gas transmission pipelines can be subjected to concentrated lateral loads and as a result, a dent can form. A dent is a localized defect in the pipe wall in the form of a permanent inward plastic deformation. This kind of defect is a matter of serious concern for the pipeline operator since a rupture or a leak may occur. Dent may not pose an immediate threat to the structural integrity of a pipeline. However, it can possibly hinder the operational and inline inspection activities. In the long run, it can cause a leak or rupture in the pipeline under sustained or cyclic pressure load. Hence, AMSE B31.8 recommends a strain-based criterion for the assessment of dents. This strain-based criterion was developed based on several assumptions. This study was undertaken using full-scale laboratory tests and finite element analyses to review and revisit the ASME strain-based dent evaluation criterion and its assumptions. It was found that some of these assumptions are incorrect, and hence, this dent evaluation criterion can lead to inaccurate estimations of critical (effective) strain values in dents, which in turn can lead to inaccurate assessments of the dents.
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August 2012
Codes And Standards
Revisiting ASME Strain-Based Dent Evaluation Criterion
Abu Naim Md Rafi,
Abu Naim Md Rafi
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
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Sreekanta Das,
Sreekanta Das
Centre for Engineering Research in Pipeline,
e-mail: sdas@uwindsor.ca
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
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Hossein Ghaednia,
Hossein Ghaednia
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
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Jorge Silva,
Jorge Silva
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
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Richard Kania,
Richard Kania
TransCanada Pipelines Limited, Calgary, Alberta,
Canada T2P 5H1
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Rick Wang
Rick Wang
TransCanada Pipelines Limited, Calgary, Alberta,
Canada T2P 5H1
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Abu Naim Md Rafi
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
Sreekanta Das
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4e-mail: sdas@uwindsor.ca
Hossein Ghaednia
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
Jorge Silva
Centre for Engineering Research in Pipeline,
University of Windsor
, Windsor, Ontario, Canada
N9B 3P4
Richard Kania
TransCanada Pipelines Limited, Calgary, Alberta,
Canada T2P 5H1
Rick Wang
TransCanada Pipelines Limited, Calgary, Alberta,
Canada T2P 5H1
J. Pressure Vessel Technol. Aug 2012, 134(4): 041101 (7 pages)
Published Online: July 27, 2012
Article history
Received:
April 23, 2011
Revised:
October 28, 2011
Published:
July 26, 2012
Online:
July 27, 2012
Citation
Md Rafi, A. N., Das, S., Ghaednia, H., Silva, J., Kania, R., and Wang, R. (July 27, 2012). "Revisiting ASME Strain-Based Dent Evaluation Criterion." ASME. J. Pressure Vessel Technol. August 2012; 134(4): 041101. https://doi.org/10.1115/1.4005890
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