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Research Papers: Piper and Riser Technology

Experimental Study and Finite Element Analysis for the Installation of a Pipeline Into an Existing Pipeline

[+] Author and Article Information
Yong Bai

e-mail: baiyong@zju.edu.cn

Yu Binbin

e-mail: yubinbinqq@yeah.net

Cheng Peng

e-mail: chengpeng@zju.edu.cn
Institute of Structural Engineering,
Zhejiang University,
Hangzhou,
Zhejiang, 310058, China

Wang Ning

Offshore Pipelines & Risers (OPR) Inc.,
Hangzhou,
Zhejiang, 310058, China
e-mail: wangning815914@163.com

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 14, 2011; final manuscript received February 2, 2012; published online February 22, 2013. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 135(1), 011702 (Feb 22, 2013) (8 pages) Paper No: OMAE-11-1028; doi: 10.1115/1.4006764 History: Received March 14, 2011; Revised February 02, 2012

Some metallic pipelines suffer from corrosion issues due to internal and external environmental conditions. The pipe-in-pipe technology has been developed by inserting a new pipe (e.g., plastic pipe or flexible pipe) into an existing pipeline. The pipe-in-pipe approach may be applicable to the reconstruction of an existing pipeline, where the existing pipe is used as protective casing and the inserted new pipe is used to contain corrosive petrochemicals. The new pipe is installed in the long existing pipeline with several bends. The magnitude of the pull-in load and the response of the inserted pipe are the major concerns during installation. This paper presents the installation process of inserting a plastic pipe into an existing steel pipe, based on model tests, finite element analysis (FEA), and analytical investigations. First, a series of model tests are presented. In order to optimize the process of installation, sensitivity analyses based on model tests were conducted to study the influence of some key parameters, including the radius of curvature of the pipeline and diameter of the pipe. Then ABAQUS finite element models were applied to analyze the major factors. In addition, analytical studies on calculating the pull-in load are presented to make a comparison with the FEA and model test results. Since little previous work has been done about simulating the installation process of this kind of rehabilitation, the proposed finite element analysis results and the analytical studies of the installation can serve as a feasibility study for the design and evaluation of offshore pipeline rehabilitation project.

Copyright © 2013 by ASME
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References

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Figures

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Fig. 1

General installation procedure

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Fig. 2

Configuration of model test

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Fig. 3

Measured pull-in load for cases 1, 2, and 3

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Fig. 4

Measured pull-in load for cases 4, 5, and 6

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Fig. 5

Measured pull-in load for cases 7 and 8

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Fig. 6

Effect of D/d ratio for cases 2, 5, and 7

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Fig. 7

Stress-strain curve of HDPE

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Fig. 8

Sketch of ABAQUS model

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Fig. 9

Comparison of pull-in load for cases 1, 2, and 3

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Fig. 10

The geometry of the outer and inner pipes

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Fig. 11

Cantilever beam with end loads

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Fig. 12

Transition of contact forces at points B1 and B2

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Fig. 13

Capstan effect due to directional change

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Fig. 14

The flow chart of iterative procedure

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Fig. 15

Effect of D/d ratio

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