Effects of Reeling on Pipe Structural Performance Part I: Experiments

[+] Author and Article Information
Stelios Kyriakides

The University of Texas at Austin, WRW 110, Austin, TX 78712

1Corresponding author.

ASME 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 involves repeated excursions into the plastic range of the material, which induce ovality 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%. Sets of experiments involving three reeling/unreeling cycles at different levels of tension are performed on tubes with D/ts 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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