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Reliability Analysis of Corroded Pipelines Under External Pressure

[+] Author Affiliations
A. P. Teixeira, O. G. Palencia, C. Guedes Soares

Universidade de Lisboa, Lisboa, Portugal

Paper No. OMAE2017-61964, pp. V03AT02A057; 9 pages
doi:10.1115/OMAE2017-61964
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3A: Structures, Safety and Reliability
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5765-6
  • Copyright © 2017 by ASME

abstract

This paper aims at assessing the reliability of pipelines with corrosion defects subjected to external pressure. Several design methods that explicitly account for the effect of corrosion damages on the collapse pressure of pipelines are considered. In particular, semi-empirical design equations derived from small-scale experiments and three-dimensional non-linear finite element analyses and design code methods currently used in practice are adopted. First, the design methods are analyzed and their predictions compared and then used to formulate the reliability problem of corroded pipelines subjected to external pressure. The reliability analysis adopts the state-of-the art stochastic models to characterize the uncertainty on the main parameters influencing the structural safety of corroded subsea pipelines. Parametric and sensitivity analyses are then performed for different levels of corrosion damages to identify the influence of the various parameters on the collapse probability of corroded pipelines under external pressure.

Copyright © 2017 by ASME

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