Pipelines used to transport oil and gas products are often subjected to external forces during its construction or operation, which can result in the formation of dents in the pipe. Various pipeline codes have stipulations on how a dent's severity can be ascertained in order to prioritize repairs. The most prominent being the depth-based criterion, which determines the severity of a dent by its depth. The depth-based criterion fails to consider the fact that the geometry of the dent can result in high strain concentration and eventually lead to integrity issues at the dented region. Alternatively, the strains associated with the dent can be an indicator of the dent's severity. Nonmandatory codified equations are available for evaluating the strains at the dented region of the pipe. The current implementation of these equations might fail to capture the strains that are not aligned with the most severe deformation profile of the dent and as such a global view of the strain distribution of the dented profile would be more informative as per the localized strain distribution. The study presented herein is the implementation of ASME B31.8 formulations together with the suggested modifications to evaluate the three-dimensional (3D) strain state of the dented pipe. The strain distributions obtained are compared against the strains predicted by finite element analysis (FEA) model. The correlation in the predicted strains indicates the possibility of the rapid and concise strain based characterization of dented pipes with the proposed technique.
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August 2018
Research-Article
Improvements to the ASME B31.8 Dent Strain Equations
Chike Okoloekwe,
Chike Okoloekwe
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
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Nikko Aranas,
Nikko Aranas
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
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Muntaseer Kainat,
Muntaseer Kainat
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
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Doug Langer,
Doug Langer
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
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Sherif Hassanien,
Sherif Hassanien
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
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J. J. Roger Cheng,
J. J. Roger Cheng
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
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Samer Adeeb
Samer Adeeb
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
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Chike Okoloekwe
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
Nikko Aranas
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
Muntaseer Kainat
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
Doug Langer
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
Sherif Hassanien
Enbridge Liquids Pipelines Inc.,
Edmonton, AB T5J 0H3, Canada
Edmonton, AB T5J 0H3, Canada
J. J. Roger Cheng
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
Samer Adeeb
Department of Civil and Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2R3, Canada
University of Alberta,
Edmonton, AB T6G 2R3, Canada
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 12, 2017; final manuscript received April 2, 2018; published online May 28, 2018. Assoc. Editor: Kiminobu Hojo.
J. Pressure Vessel Technol. Aug 2018, 140(4): 041101 (9 pages)
Published Online: May 28, 2018
Article history
Received:
September 12, 2017
Revised:
April 2, 2018
Citation
Okoloekwe, C., Aranas, N., Kainat, M., Langer, D., Hassanien, S., Roger Cheng, J. J., and Adeeb, S. (May 28, 2018). "Improvements to the ASME B31.8 Dent Strain Equations." ASME. J. Pressure Vessel Technol. August 2018; 140(4): 041101. https://doi.org/10.1115/1.4040096
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