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Research Papers: Piper and Riser Technology

Postbuckling Analysis of Snaked-Lay Pipelines Based on a New Deformation Shape

[+] Author and Article Information
Yuxiao Liu

Management Science and Engineering College,
Shandong Institute of Business and Technology,
Yantai 264005, PRC;
State Key Laboratory of Coastal
and Offshore Engineering,
Dalian University of Technology,
Dalian 116023, PRC

Jing Zhou

State Key Laboratory of Coastal
and Offshore Engineering,
Dalian University of Technology,
Dalian 116023, PRC

Hualing Song

Management Science and Engineering College,
Shandong Institute of Business and Technology,
Yantai 264005,PRC

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 17, 2012; final manuscript received February 6, 2013; published online June 6, 2013. Assoc. Editor: Elzbieta Maria Bitner-Gregersen.

J. Offshore Mech. Arct. Eng 135(3), 031704 (Jun 06, 2013) (9 pages) Paper No: OMAE-12-1006; doi: 10.1115/1.4024101 History: Received January 17, 2012; Revised February 06, 2013

Lateral buckling must be considered in exposed HP/HT pipeline design. The snaked-lay method is an effective lateral buckling control method, a new deformation shape of snaked-lay pipeline is presented, and a control criterion of offset angle is also presented. When the offset angle is small or offset angle is large while the pipeline length of snaked-lay is too short or long, the maximum moments of postbuckling pipeline are large. For these problems, a new controlling method combined with snaked-lay and sleeper is proposed, which is named the SS method. Using Ansys, a nonlinear finite element model considering the interaction of seabed-sleeper-pipeline is established. The SS method is proved to be feasible to control lateral buckling for submarine pipelines. Based on critical axial compressive force and maximum bending moment, a design criterion of sleeper height is suggested.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Shape of snaked-lay pipeline

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Fig. 2

Shape of snaked-lay pipeline

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Fig. 3

The new deformation shape of snaked-lay pipeline

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Fig. 4

Comparison between two snaked-lay shapes

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Fig. 5

Sketch map for laying snaked pipeline

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Fig. 6

Stress-strain relationship for X65 pipeline steel

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Fig. 7

Pipeline-soil interaction model

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Fig. 8

Force-displacement relationship

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Fig. 9

Pipeline finite element model

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Fig. 10

Temperature-maximum moment curve

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Fig. 11

Temperature-maximum moment curve

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Fig. 12

Critical buckling force changing with L0

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Fig. 13

Critical buckling force (θ = 11.5 deg)

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Fig. 14

Maximum moment (D/t = 21)

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Fig. 15

Maximum moment (D/t = 32)

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Fig. 16

Maximum moment (D/t = 42)

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Fig. 17

Sleeper sketch map

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Fig. 18

Stress-strain relationship for soil

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Fig. 19

Seabed-sleeper-pipeline model

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Fig. 20

Critical buckling forces (D = 0.3 m, D/t = 21, θ = 11.5 deg)

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Fig. 21

Maximum moment under different sine length (D = 0.3 m, θ = 5.7 deg)

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Fig. 22

Maximum moment under different offset angle (D = 0.3 m)

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Fig. 23

Maximum moment under different D/t (D = 0.3 m, θ = 5.7 deg)

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Fig. 24

Critical buckling forces (D = 0.65 m, D/t = 27.1, θ = 11.5 deg)

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Fig. 25

Maximum moment (θ = 11.5 deg)

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