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Research Papers: Materials Technology

Failure of Pressurized Corroded Pipeline Subject to Axial Compression: A Parametric Study

[+] Author and Article Information
Halima Dewanbabee

Research Assistant

Sreekanta Das

Associate Professor of Structural Engineering
e-mail: sdas@uwindsor.ca
Centre for Engineering Research in Pipelines,
Department of Civil and
Environmental Engineering,
University of Windsor,
401 Sunset Avenue,
Windsor, ON N9B 3P4, Canada

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 2, 2012; final manuscript received January 23, 2013; published online May 24, 2013. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 135(3), 031402 (May 24, 2013) (8 pages) Paper No: OMAE-12-1019; doi: 10.1115/1.4023799 History: Received March 02, 2012; Revised January 23, 2013

Onshore buried steel pipelines are used for transporting oil and gas to various cities and locations. These pipelines can be subjected to various loading, such as axial, bending, shear, and other complex loading from the geotechnical movements and temperature variations. For example, a buried pipeline situated on an unstable slope can be subjected to axial load and axial deformation. In addition, this pipe experiences pressure loading from the fluids that it transports. The buried pipelines also need to endure corrosive environmental and as a result, corrosion occurs in these pipelines. Corrosion is the primary cause for structural failure of buried oil and gas pipelines and corrosion may lead to a catastrophic rupture failure causing environmental damage, injuries to human and animals, and loss of production and revenue. Hence, understanding the structural behavior and failure conditions of corroded pipelines is important for the pipeline operators. Therefore, this project was undertaken to determine the conditions required for failures of corroded steel pipes when subjected to axial deformation and internal pressures. Then the effect of internal pressure, dimensions of the corrosion, and depth of corrosion on the failure condition and failure mode was studied. It was found that the increasing value of these parameters is beneficial for achieving a favorable failure mode, however it can reduce the axial load carrying capacity significantly.

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References

Figures

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Fig. 1

Nominal stress-strain behavior

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Fig. 2

Details of corrosion defect

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Fig. 3

Schematic of test setup

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Fig. 4

Wrinkle in pipe specimens

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Fig. 5

Load-deformation behavior from test and FEA (a) SP20d50 and (b) RP40d25

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Fig. 6

Schematic of pipe model and boundary conditions

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Fig. 7

FE model for a corroded pipe specimen

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Fig. 8

Final deformed shapes of two specimens

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Fig. 9

Effect of internal pressure on failure mode (a) d/t = 0.25 and (b) d/t = 0.5

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Fig. 10

Effect of corrosion aspect ratio on failure mode (a) d/t = 0.25 and (b) d/t = 0.5

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Fig. 11

Effect of corrosion depth on failure mode (a) p/py = 0.20 and (b) p/py = 0.80

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Fig. 12

Effect of internal pressure on maximum load carrying capacity (a) d/t = 0.25 and (b) d/t = 0.5

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Fig. 13

Effect of corrosion aspect ratio on maximum load carrying capacity (a) d/t = 0.25 and (b) d/t = 0.5

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Fig. 14

Effect of corrosion depth on maximum load carrying capacity (a) p/py = 0.20 and (b) p/py = 0.80

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