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Implementation of a New Tool for Pipelines Integrity Evaluation: A Correlation Between Local Strains and Hardness

[+] Author Affiliations
Clément Soret, Mélissandre Bonnaudet

RICE, Saint-Denis La Plaine, France

Joseph Marae Djouda, Yazid Madi

ERMESS, Sceaux, France

Murès Zarea

CRIGEN, Saint-Denis La Plaine, France

Paper No. IPC2018-78547, pp. V001T03A014; 10 pages
doi:10.1115/IPC2018-78547
From:
  • 2018 12th International Pipeline Conference
  • Volume 1: Pipeline and Facilities Integrity
  • Calgary, Alberta, Canada, September 24–28, 2018
  • Conference Sponsors: Pipeline Division
  • ISBN: 978-0-7918-5186-9
  • Copyright © 2018 by ASME

abstract

Due to external interference, pipelines used for onshore as well as offshore operations can present dent and gouge defects. As such defects can seriously impair facilities’ integrity and performance, it is necessary to evaluate the strains in the vicinity of these defects. The development of non-destructive approaches to assess defects severity remains an issue in the pipeline industry. In the present study, micro-hardness - strain relationships are established for three steel grades of pipeline materials: API X52 modern, API X52 vintage and API X63 vintage. The micro-hardness – strain correlations of the three pipe materials are analyzed in order to verify if they can be described by a master curve. For that purpose, Notched Tensile (NT) tests are performed in Longitudinal (L) and Transverse (T) directions for each grade in order to reach high strain values (up to 70%). The relationship proposed by Tabor was improved with the introduction of three new parameters that allow considering actual material behavior.

Copyright © 2018 by ASME
Topics: Pipelines

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