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Some Remarks on the Strain Based Assessment of Pipeline Dents

[+] Author Affiliations
Dauro Braga Noronha, Jr., Ricardo Rodrigues Martins

Petrobras R&D Center, Rio de Janeiro, RJ, Brazil

Breno Pinheiro Jacob

Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Eduardo de Souza

Petrobras E&P, Rio de Janeiro, RJ, Brazil

Paper No. IPC2008-64136, pp. 241-249; 9 pages
doi:10.1115/IPC2008-64136
From:
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 2
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4858-6 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by ASME

abstract

In order to use the method to estimate strain in dents proposed in Appendix R of ASME B31.8 – Gas Transmission and Distribution Piping Systems – 2003 Edition, in a previous paper the authors used fourth-order B-spline curves to approximate the dent profile in both longitudinal and circumferential directions. This approach proved to be effective to estimate bending strains when the coordinates of the deepest point of the dent are known. This paper studies the impact of the distance between the closest ILI tool sensor and the dent apex on the measured dent depth and on the circumferential bending strain. The results obtained were tested against a set of nonlinear finite element analyses of dented pipelines carried out at PETROBRAS R&D Center. It was concluded that the number of sensors of the ILI tool, and consequently the maximum possible angular distance of the closest sensor in relation to the deepest point of the dent, plays a decisive role on the exactness of the results achieved. It is also mentioned that the equations to estimate the total strain in the inner and outer surface of the pipe wall presented in Appendix R contains a conceptual error and therefore shall be revised. Furthermore, longitudinal membrane strains obtained using the formula proposed in Appendix R were compared to finite element results. The comparison showed that directions on how to measure the dent length should be incorporated into the ASME B31.8 Code.

Copyright © 2008 by ASME
Topics: Pipelines

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