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Piper and Riser Technology

Bending Capacity Analyses of Corroded Pipeline

[+] Author and Article Information
Weiwei Yu1

 Chevron Technology Company, Houston, TX 77002weiwei.yu@chevron.com

Pedro M. Vargas2

 Chevron Technology Company, Houston, TX 77002pedrovargas@chevron.com

Dale G. Karr

 University of Michigan, Ann Arbor, MI 48109dgkarr@umich.edu

1

Address all correspondence related to ASME style format and figures to this author.

2

Address all correspondence for other issues to this author.

J. Offshore Mech. Arct. Eng 134(2), 021701 (Dec 05, 2011) (12 pages) doi:10.1115/1.4004521 History: Received March 11, 2010; Revised March 17, 2011; Published December 05, 2011; Online December 05, 2011

Appendix G of the ASME B31 pipeline and piping codes addresses the pressure containment capacity of pipelines and vessels with locally corroded sections. However, the ability of corroded sections to carry moment, for example, in thermal loops, is not addressed in fitness-for-service codes today. This paper presents nonlinear Finite Element Analysis (FEA) and full-scale 4-point-bend testing of pipes with locally-thinned-areas (LTAs) to simulate corrosion. The LTAs are loaded in compression, and the buckle moment is used as the carrying capacity of the corroded section. The nonlinear FEA is found to match the experimental results, validating this methodology for computing moment capacity in corroded sections. Significant secondary effects were found to affect the testing results. This paper identifies and quantifies these effects. Also, somewhat contrary to intuition, internal pressure is demonstrated to adversely affect the bending capacity for the intermediate-low D/t ratio (17.25) pipe tested.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Finite element model

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Figure 3

Two finite element models: (a) 15 deg model and (b) 60 deg degree model

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Figure 4

Moment-rotation results for the 60 deg model with different LTA geometry

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Figure 5

Element types for meshing: (a) quadratic tetrahedron element for the 15 deg model meshing and (b) quadratic brick element for the 60 deg model meshing

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Figure 6

Meshing sensitivity analyses by element types

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Figure 7

Meshing sensitivity analyses by linear meshing and quadratic meshing in the 60 deg case

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Figure 8

Experimental test program setup

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Figure 9

Stress strain curve from tensile test

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Figure 10

Defect of specimens

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Figure 11

Specimens after tests

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Figure 12

Experimental test results

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Figure 13

Experimental test and finite element analysis results comparison

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Figure 14

Moment and the corresponding Von Mises stress at center of LTA versus rotation for specimen 4

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Figure 16

Added axial tension in the finite element analysis of specimen 4

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Figure 17

Full model in the finite element analysis of specimen 4

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Figure 18

End cap effect of test 8

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Figure 19

Tie constraint between the end cap and the pipe

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Figure 20

Internal pressure effect

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