Mechanical behavior and wrinkling of lined pipes

Vasilikis, Daniel; Karamanos, Spyros A.

doi:10.1016/j.ijsolstr.2012.07.023

Cited by 65 publications

(19 citation statements)

References 13 publications

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“…Recent analytical/numerical efforts such as those of Vasilikis and Karamanos [13] and the present authors [14][15][16], have led to the following understanding of the problem. Bending to curvature levels such as those experienced by reeled pipe plasticizes and ovalizes the cross sections of both the carrier pipe and liner.…”

Section: Introductionmentioning

confidence: 81%

“…Simultaneously, both tubes ovalize with the liner ovalizing more. Thus, the initial contact stress between the two tubes gets gradually reduced and eventually the liner partially separates from the steel pipe (see [13][14][15][16]). The girth weld prevents this differential deformation of the liner and the constraint causes an axially periodic disturbance at the upper and lower ends of the liner.…”

Section: Wrinkling and Collapse Of A Girth-welded Pipementioning

confidence: 99%

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Liner wrinkling and collapse of girth-welded bi-material pipe under bending

Lin

Kyriakides

2015

Applied Ocean Research

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Section: Introductionmentioning

confidence: 81%

Section: Wrinkling and Collapse Of A Girth-welded Pipementioning

confidence: 99%

Liner wrinkling and collapse of girth-welded bi-material pipe under bending

Lin

Kyriakides

2015

Applied Ocean Research

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“…Recent analytical/numerical efforts such as those of Vasilikis and Karamanos [15] and the present authors [1,2], have led to the following understanding of the problem. Bending to curvature levels such as those experienced by reeled pipe plasticize and ovalize the cross sections of both the carrier pipe and liner.…”

Section: Introductionmentioning

confidence: 81%

Wrinkling and Collapse of Girth-Welded Lined Pipe Under Bending

Lin

Kyriakides

2014

Volume 6A: Pipeline and Riser Technology

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Pipelines and flowlines that carry corrosive hydrocarbons are often protected by lining them internally with a thin layer of a corrosion resistant material. In the most economic method, the liner is brought in contact with a carbon steel carrier pipe by mechanical expansion. In applications involving severe plastic bending, such as reeling, such a liner can wrinkle and collapse while the carrier pipe remains intact. A numerical framework for establishing the extent to which lined pipe can be bent before liner collapse was presented in [1,2]. This framework, suitably extended is used here to examine the effect of girth welds on liner collapse. The modeling starts by simulating the expansion process that plastically deforms the two tubes bringing them into contact. Bending plastically the composite structure leads to differential ovalization of the two tubes and detachment of the liner. The girth weld locally prevents this detachment creating a periodic boundary effect in the liner. With increasing bending this local disturbance grows leading eventually to a diamond-shaped liner collapse mode. The problem is first investigated using a 12-inch carrier pipe base case followed by a parametric study of the factors that influence collapse.

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“…It was shown that when an MLP is subjected to bending the liner initially ovalizes together with the backing pipe [27,28]. Then, the liner starts separating uniformly from the backing pipe [29][30][31]. This results in a partial [32] or complete loss [29] of grip.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Liner Wrinkling During High Strain Bending of Mechanically Lined Pipe

Pépin

Tkaczyk

Martínez

et al. 2019

Volume 5B: Pipelines, Risers, and Subsea Systems

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A high demand for transport of corrosive fluids subsea has generated interest in solid corrosion resistant alloy (CRA) and bi-metal pipes. Bi-metal pipes, including hot-roll bonded (HRB) clad and mechanically lined pipes (MLP), are made of a carbon steel (CS) pipe lined with a CRA layer. Mechanically lined pipes, where the CRA liner is held inside the host pipe by means of an interference fit, offer shorter lead times and are considerably more economical than equivalent solid CRA and HRB clad pipes with a metallurgical bond between CS and CRA layers. Reel-lay is a cost-effective method for installing subsea pipelines up to 18” (457.2 mm) in diameter. However, plastic straining associated with reeling may trigger wrinkling of the CRA liner. Two approaches for safe installation of reeled MLPs have therefore been proposed: pressurised and non-pressurised reeling. This paper focuses on reel-lay installation at atmospheric pressure. Nevertheless, the numerical analysis framework presented is also applicable to MLPs installed at elevated pressure in a scenario where they are subjected to bending after being depressurised. Small-scale mechanical tests were carried out to assess the effect of manufacturing and cyclic plastic bending on the tensile behaviour of the CRA liner. After full-scale bending trials had been undertaken, they were simulated numerically to demonstrate the suitability of the proposed numerical approach for predicting liner separation from the host pipe and subsequent wrinkling during high strain bending. To improve ovality prediction, which governs liner separation and wrinkling, the authors developed an advanced metal plasticity model.

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Mechanical behavior and wrinkling of lined pipes

Cited by 65 publications

References 13 publications

Liner wrinkling and collapse of girth-welded bi-material pipe under bending

Liner wrinkling and collapse of girth-welded bi-material pipe under bending

Wrinkling and Collapse of Girth-Welded Lined Pipe Under Bending

Prediction of Liner Wrinkling During High Strain Bending of Mechanically Lined Pipe

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