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Research Papers: Pipeline Systems

Effect of Misalignment and Weld Induced Residual Stresses on the Local Buckling Response of Pipelines

[+] Author and Article Information
Aiman Al-Showaiter

 MCS Kenny, Houston, TX 77084; Dalhousie University, Halifax, NS, B3J 1Z1, Canada

Farid Taheri

 Dalhousie University, Halifax, NS, B3J 1Z1 Canada

Shawn Kenny

 Memorial University, St. John’s, NL, A1B 3X5 Canada

J. Pressure Vessel Technol 133(4), 041701 (May 17, 2011) (7 pages) doi:10.1115/1.4002858 History: Received May 13, 2008; Revised June 25, 2010; Published May 17, 2011; Online May 17, 2011

The aim of the present study is to develop numerical modeling procedures to simulate and study the effect of girth weld induced residual stresses and geometric imperfections on the behavior of conventional carbon steel oil and gas pipelines. The effect of welding residual stresses was obtained through computational simulations of the multipass girth weld process. The numerical procedures were calibrated using available pubic domain data on stainless steel. The methodology for conducting the welding simulation is presented. A parametric analysis was conducted using the finite element methods to evaluate the effects of welding residual stress due to girth welding processes, joint-to-joint misalignment associated with the girth weld, internal pressure, axial force, and diameter to wall thickness ratio on the local buckling response of pipelines. The pipeline moment-curvature response was examined to determine the influence of these parameters. For the parameters investigated, results from this study have demonstrated the significance of residual stress state due to welding processes and girth weld misalignment on the local buckling response of pipelines subjected to monotonic loading with combined stress state.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pipe and weld joint geometry

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Figure 2

3D finite element mesh used for the welding model

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Figure 3

Thermal histories on the inside surface during the first and second pass of welding

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Figure 4

Normalized longitudinal stress distribution on the inside surface of the pipe

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Figure 5

Normalized hoop stress distribution on the inside surface of the pipe

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Figure 6

(a) Finite element model used in the pipeline parametric study including the misalignment configurations and (b) the stress-strain curve represented by the Ramberg–Osgood model

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Figure 7

Effect of the residual stresses on the global moment-curvature response of the pipe with a D/t ratio of 70

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Figure 8

Effect of the misalignment imperfection on the global moment-curvature response of the pipe with a D/t ratio of 70

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Figure 9

The combined effect of the residual stresses and misalignment imperfections (amplitude=0.2 mm) on the global moment-curvature response of the pipe with a D/t ratio of 70

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Figure 10

The combined effect of the residual stresses and misalignment imperfections (amplitude=1.6 mm) on the global moment-curvature response of the pipe with a D/t ratio of 70

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Figure 11

The combined effect of the residual stresses and misalignment imperfections (amplitude=0.2 mm) on the global moment-curvature response of the pipes with a D/t ratio of 70 and 90 and 60% internal pressure ratio

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Figure 12

Effect of the axial force on the pipeline global moment-curvature relationship in the pipe with a D/t ratio of 70

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