Adverse weather conditions during a pipelay operation may be a reason to abandon the pipeline and recover it when weather conditions allow it. The aim of the analysis presented in this paper is to predict the residual torque in steel wire ropes during abandon (pay-out) and recovery (pay-in). The basis of the analysis is the derivation of the stiffness coefficients when torque and tension are coupled by a torque factor. Based on a theoretical model a computer program is written to simulate in an incremental way the torsion in the ropes during pay-in and pay-out. The model includes transport of torsion as well as slip. The calculated residual torque allows for a risk assessment with respect to hockling.
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Terry Jones Pipeline Technology
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