Bending deformability is required for line pipes used in reeling lay (R-lay) methods in which the pipes are reeled and unreeled on spools. This study describes the reelability of a girth-welded pipe, evaluated by the full-scale bending test and FEA simulation. These approaches demonstrate that the strength difference between the girth-welded pipes increases the possibility of local buckling while the strength variation in the circumferential direction is not detrimental to reelability. The results of this study, especially the investigation of fracture mechanism in reeling, demonstrate non-heat-treated (NHT) ERW line pipe can be used for R-lay.

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