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Liner wrinkling and buckling due to repeated winding/unwinding of lined pipe on a large diameter reel
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DOI：10.1016/j.ijsolstr.2026.113908.png)
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Abstract
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Bending a carbon steel pipeline lined with a thin layer of corrosion resistant alloy to levels such as those experienced in the reel installation method can lead to wrinkling and buckling of the liner. Winding/unwinding the pipeline under a pressure of a few bar, tends to keep the liner in contact with the carrier pipe longer and delay the instability, making it reelable. A preceding study showed that cyclic bending results in progressive growth of wrinkle amplitude and leads to diamond-type buckling. This behavior is similar to that under monotonic bending, but with the number of cycles replacing curvature as the controlling parameter. The present study uses a large-scale finite element analysis of the repeated winding/unwinding of a pipeline onto a reel under back tension to investigate the stability of the liner. The analysis captures the more complex cyclic history induced to the pipeline by reel-lay. It is shown that it also causes progressive accumulation of ovalization of both tubes, with the liner separating from the carrier and developing crosswise wrinkles. The wrinkle amplitude grows with each cycle and, when the separation reaches a critical value, its rate of growth accelerates and evolves into diamondtype buckles. As under cyclic pure bending, the critical liner separation corresponds to that under pure monotonic bending, a strong result that can guide design. However, the rate of accumulation of liner separation and wrinkle amplitude is slower than in pure bending cycling to the curvature of the reel, highlighting the importance of full-scale reeling simulations. Sensitivity of the number of cycles to reach criticality to key problem parameters such as the amplitude of initial liner geometric imperfections, the level of internal pressure, back tension, the reel radius, and the pipeline diameter enriches the database available to the designer.
Keywords:
Reeling of pipeline
Lined pipe
Wind-unwind
Reel-lay
Cyclic plasticity
Journal
IF:
3.8
Papers:
1.1W
Citations:
3.1W
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