Research Papers: Pipeline Systems

Behavior of X60 Line Pipe Subjected to Axial and Lateral Deformations

[+] Author and Article Information
Navid Nazemi

Department of Civil and Environmental Engineering, University of Windsor, Windsor, ON, N9B 3P4, Canada

Sreekanta Das1

Department of Civil and Environmental Engineering, University of Windsor, Windsor, ON, N9B 3P4, Canadasdas@uwindsor.ca


Corresponding author.

J. Pressure Vessel Technol 132(3), 031701 (Apr 28, 2010) (7 pages) doi:10.1115/1.4001426 History: Received November 28, 2008; Revised March 08, 2010; Published April 28, 2010; Online April 28, 2010

Buried pipelines may be subjected to various complicated combinations of forces and deformations. This may result in localized curvature, strains, and associated deformations in the pipe wall. As a result, wrinkle may form. The wrinkled pipeline may then develop a rupture in the pipe wall and lose its structural integrity if it is subjected to further sustained loads or deformations. Recently, laboratory tests on NPS6 steel pipes were undertaken at the University of Windsor to study the wrinkling and post-wrinkling behaviors of this NPS6 pipe when subjected to lateral load in addition to internal pressure and axial load. Four full-scale laboratory tests were conducted, and it was found that the application of lateral load on wrinkled pipe produces a wrinkle shape similar to that occurred in a field NPS10 line pipe. Complex test setup was designed and built for successful loading and completion of these tests. This paper makes a detailed discussion on the test setup, test method, loading and boundary conditions, instruments used, and test results obtained from this study.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Accordion type failure under monotonic axial loading (5)

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Figure 2

Rupture in the wrinkle due to cyclic axial deformation (11)

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Figure 3

Shape of the wrinkle in the field NPS10 line pipe

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Figure 4

Schematic of the test setup

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Figure 5

Picture of the test setup

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Figure 6

Swivel head support assembly

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Figure 7

Load-deformation behavior of specimen 4

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Figure 8

Load-deformation behavior of specimen 2

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Figure 9

Deformed shape of specimen 4 at the end of various load steps

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Figure 10

Axial deformation-end rotations of specimens 1 and 4

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Figure 11

Axial load-axial deformation behavior of all specimens

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Figure 12

Comparison of field and lab specimens 2

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Figure 13

Specimen 3 split into two pieces during the pressure test

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Figure 14

Shape of all specimens before the pressure tests

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Figure 15

Relative locations of the strain gauges

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Figure 16

Axial load-strain behavior of specimen 4




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