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Torsion Instability of Offshore Cables During Installation

[+] Author Affiliations
Svein Sævik

Norwegian University of Science and Technology, Trondheim, Norway

Evgenii Koloshkin

Design and Research Institute VNIPIgazdobycha, Gazprom Subsidiary, Saratov, Russia

Paper No. OMAE2017-61135, pp. V05AT04A007; 10 pages
doi:10.1115/OMAE2017-61135
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5A: Pipelines, Risers, and Subsea Systems
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5769-4
  • Copyright © 2017 by ASME

abstract

The present paper addresses torsion instability at the touch down point during installation of offshore cables and flexible pipes. A model for installation instability analysis is established on the basis of standard co-rotated beam elements. The model is validated with respect to the Greenhill analytical solution as well as results obtained for the linear elastic case reported in literature. A case study is then carried out to investigate the effects of cross-section friction moment, inherent torque and vessel motion. This is then used as basis for a proposed design criteria and recommended analysis procedures for evaluating kink formation of offshore flexibles during installation.

Copyright © 2017 by ASME

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