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Research Papers: Pipeline Systems

Damage and Springback Analysis of Two Typical Dented Pipelines With Different Parameters

[+] Author and Article Information
Ying Wu

School of Civil Engineering and Architecture,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: wy_swpi@swpu.edu.cn

Jiacheng Li

School of Civil Engineering and Architecture,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: 201722000517@stu.swpu.edu.cn

Linya Li

School of Civil Engineering and Architecture,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: 201721000803@stu.swpu.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 27, 2019; final manuscript received April 12, 2019; published online May 13, 2019. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 141(4), 041701 (May 13, 2019) (11 pages) Paper No: PVT-19-1016; doi: 10.1115/1.4043590 History: Received January 27, 2019; Revised April 12, 2019

During pipeline construction, the pipeline may be impacted by sharp rocks or excavators. To study the failure mechanism of the pipeline, the damage degree and springback rate of the pipelines with two typical dents (transverse and longitudinal) were analyzed in terms of various factors (indenter size, pipeline size and internal pressure, and dent depth). The results reveal the following: (1) when pipeline size and internal pressure are unchanged and indenter size is changed, the integral value I used to measure the damage degree of the dented pipeline increases with increasing dent depth. When the dent depth reaches a certain value, at the same dent depth, the smaller the indenter size, the larger the damage integral value; (2) when other parameters remain unchanged, the larger the pipeline size is, the larger is the damage integral value, and the larger the internal pressure is, the smaller is the damage integral value. (3) The curves for damage and springback for the two kinds of dents are basically similar. Generally, the maximum damage of the longitudinal dent is larger than that of the transverse dent. (4) By a combination of an orthogonal experimental design and a gray correlation degree calculation, for the damage integral value of the two typical dented pipelines, the order of importance of the influential factors was obtained. (5) Formulas for the damage integral value and influence factors were fit using a nonlinear regression method, which provides a reference for calculation of pipeline damage.

Copyright © 2019 by ASME
Topics: Pressure , Pipelines , Damage
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References

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Figures

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Fig. 1

Schematic diagrams of transverse and longitudinal dents

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Fig. 2

Pipeline steel stress–strain simplified line diagram

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Fig. 3

Illustration of the ellipsoidal indenter

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Fig. 4

The division diagram of model boundary condition for one-quarter pipeline

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Fig. 5

Schematic diagram of 120 deg-constraint-range on the bottom of the pipeline model

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Fig. 6

Meshing schematic diagrams of transverse (left) and longitudinal (right) dents

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Fig. 7

The process of forming the dent on the pipeline

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Fig. 8

Diagram of dent depth and integral values with different indenter sizes for transverse (left) and longitudinal (right) dents

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Fig. 9

Dividing sketch of the dent area for transverse (top) and longitudinal (bottom) dents

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Fig. 10

Diagram of the equivalent strain and dent depth with different indenter sizes for two kinds of dented pipeline

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Fig. 11

Diagram of springback rate and dent depth with different indenter sizes for two kinds of dented pipeline

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Fig. 12

Diagram of dent depth and integral value with different radios of wall thickness to diameter for two kinds of dented pipeline

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Fig. 13

Diagram of springback rate and dent depth with different ratios of wall to pipeline diameter for two kinds of dented pipeline

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Fig. 14

Diagram of dent depth and integral value with different internal pressures for two kinds of dented pipeline

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Fig. 15

Diagram of dent depth and the springback rate with different internal pressures for two kinds of dented pipeline

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