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Ratcheting of Corroded Pipes

[+] Author Affiliations
Marcelo Igor Lourenço, Theodoro A. Netto

Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2012-84122, pp. 917-928; 12 pages
doi:10.1115/OMAE2012-84122
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4490-8
  • Copyright © 2012 by ASME

abstract

Corroded pipes for oil transportation can eventually experience Ratcheting after some years of operation. The evaluation of the defects caused by corrosion in these pipes is important when deciding for the repair of the line or continuity in operation. Under normal operational conditions, these pipes are subject to constant internal pressure and cyclic load due to bending and/or tension. Under such loading conditions, the region in the pipes with thickness reduction due to corrosion could experience the phenomenon known as ratcheting. The objective of this paper is to present a revision of the available numerical models to treat the ratcheting phenomenon. Experimental tests were developed allowing the evaluation of occurrence of ratcheting in corroded pipes under typical operational load conditions as well as small-scale cyclic tests to obtain the material parameters. Numerical and experimental tests results are compared. Shakedown models are also investigated as a practical tool for ratcheting prediction.

Copyright © 2012 by ASME
Topics: Pipes

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