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The Remaining Strength of Corroded Casing With Combined Hoop and Longitudinal Stress

[+] Author Affiliations
Robert B. Francini, Jacob D. Wahl, Nolan T. Quade

Kiefner & Associates, Inc., Worthington, OH

Paper No. IPC2010-31492, pp. 281-287; 7 pages
doi:10.1115/IPC2010-31492
From:
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 3
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4422-9 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME

abstract

The casings in a gas storage or production well can have large longitudinal loads in addition to the hoop stress resulting from internal pressure. Under certain circumstances these loads need to be taken into account when evaluating the remaining strength of corroded areas. The most commonly used method for corrosion evaluation is based on B31G which does not include longitudinal loads. This paper outlines the range of longitudinal loading where the B31G approach is valid. In addition, it presents a method to evaluate the remaining strength of the corroded area where the B31G approach is not valid. The procedure has been validated by burst tests of casing with real and machined metal loss under axial loading.

Copyright © 2010 by ASME
Topics: Stress

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