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research-article

SUBSEA PIPELINE LATERAL BUCKLING DESIGN ? STRAIN CONCENTRATION OR STRAIN REDUCTION FACTORS

[+] Author and Article Information
M Liu

Aker Solutions, London W4 5HR, UK
matt.liu@akersolutions.com

Colin Cross

Aker Solutions, London W4 5HR, UK
colin.cross@akersolutions.com

1Corresponding author.

ASME doi:10.1115/1.4038502 History: Received April 20, 2017; Revised November 02, 2017

Abstract

A strain concentration factor is typically incorporated in the HPHT pipeline lateral buckling assessment to account for non-uniform stiffness or plastic bending moment. Increased strain concentration can compromise pipeline low cycle fatigue and lateral buckling capacity, leading to an early onset of local buckling failure. In this paper, the philosophy of local buckling mitigation using the strain concentration factor is examined. The local buckling behaviour is evaluated. Global strain reduction and evolution against buckling is analysed with respect to varying joint mismatch level. The concept of a strain reduction factor due to joint mismatch is developed based on the global strain capacity reduction with reference to the uniform configuration. It is demonstrated that the strain reduction factor is a unique characteristic parameter. As opposed to strain concentration it is an invariant insensitive to evaluation methods and design strain demand level, hence more representative as a limiting design metric to maintain the safety margin. The rationale for its introduction as an alternative to the strain concentration factor is outlined and its benefits are established. The method for obtaining the strain reduction factor and its application is developed. The discernible difference and scenarios for application of either factors are discussed, including low and high cycle fatigue, linearity and stress concentration, ECA and lateral buckling. Additional causal factors giving rise to mismatch such as pipe schedule transition and buckler arrestor are also discussed. Iterations of FE analyses are performed for a pipe-in-pipe configuration in a case study.

Copyright (c) 2017 by ASME
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