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Research Papers: Piper and Riser Technology

Effects of Reeling on Pipe Structural Performance—Part I: Experiments

[+] Author and Article Information
Stelios Kyriakides

Research Center for Mechanics of Solids,
Structures and Materials,
The University of Texas at Austin,
WRW 110,
Austin, TX 78712
e-mail: skk@mail.utexas.edu

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 19, 2016; final manuscript received April 28, 2017; published online July 6, 2017. Assoc. Editor: Ioannis K. Chatjigeorgiou.

J. Offshore Mech. Arct. Eng 139(5), 051706 (Jul 06, 2017) (11 pages) Paper No: OMAE-16-1158; doi: 10.1115/1.4037063 History: Received December 19, 2016; Revised April 28, 2017

The winding and unwinding of a pipeline in the reeling installation process involve repeated excursions into the plastic range of the material, which induce ovality, elongation, and changes to the mechanical properties. The reeling/unreeling process involves some back tension required to safeguard the pipe from local buckling. This study examines the effects of winding/unwinding a pipe on a reel at different values of tension on the induced ovality and elongation and the resulting degradation in collapse pressure. In Part I, a model testing facility is used to simulate the reeling/unreeling process in the presence of tension. The combination of reel and tube diameters used induces a bending strain of 1.89%. A set of experiments involving three reeling/unreeling cycles at different levels of tension is performed on tubes with diameter-to-thickness ratios (D/t) of 20 and 15.5 in which the progressive changes in cross-sectional geometry and elongation are recorded. Both ovalization and elongation are shown to increase significantly as the back tension increases. A second set of experiments on the same two tube D/ts is performed in which following a reeling/unreeling cycle at a chosen level of tension, the tubes are collapsed under external pressure. The collapse pressure is shown to decrease significantly with tension, which is primarily caused by the reeling/unreeling-induced ovality. Part II presents models for simulating reeling and the induced structural degradation. The experimental results in Part I are used to evaluate the performance of the models.

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Figures

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Fig. 1

Schematics showing a typical reeling vessel configuration during (a) spooling and (b) installation. (c) Moment–curvature history induced to a pipe section by the process (winding [0-1], unwinding straightening [1-2], bending over ramp [2-3], straightening [3-4], and reverse bending and unloading [4-5-0]).

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Fig. 2

Photograph of the model reeling test facility [11]

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Fig. 3

Scaled drawings of the model reeling test facility with major components identified

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Fig. 4

(a) Schematic showing a tube being wound onto the model reel under tension and (b) photograph of the transducer and one of the strain gages for monitoring change in diameter and axial strain at location A on the specimen during reeling

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Fig. 5

Moment–curvature history induced to tube by repeated reeling and unreeling cycles

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Fig. 6

Sequence of tube configurations in the facility during reeling and unreeling

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Fig. 7

Photograph showing the tube engaging the reel during winding

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Fig. 8

Experimental data showing (a) the applied tension, (b) the ovalization, and (c) strain versus the reel rotation angle measured at section A during three cycles of reeling

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Fig. 9

(a) Measured change in diameter and (b) axial strain versus the number of reeling cycle for different values of applied tension (D/t ≈ 20)

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Fig. 10

(a) Measured change in diameter and (b) axial strain plotted versus the applied tension for cycles 1, 2, and 3 (D/t ≈ 20)

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Fig. 11

(a) Measured change in diameter and (b) axial strain versus the number of reeling cycle for different values of applied tension (D/t ≈ 15.5)

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Fig. 12

(a) Measured change in diameter and (b) axial strainplotted versus the applied tension for cycles 1, 2, and 3 (D/t ≈ 15.5)

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Fig. 13

(a) Comparison of change in diameter and (b) axial strain for tubes with D/t ≈ 20 and 15.5 reeled at a tension of about 0.35To

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Fig. 14

Residual ovality induced by one reeling cycle versus the applied back tension and the corresponding collapse pressure for D/t ≈ 20 (data on ordinate are from as-received tubes)

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Fig. 15

Residual ovality induced by one reeling cycle versus the applied back tension and the corresponding collapse pressure for D/t ≈ 15.5 (data on ordinate are from an as-received tube)

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