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Deep Water Riser Collision Avoidance by Top Tension Control

[+] Author Affiliations
Anne M. Rustad, Carl M. Larsen, Asgeir J. So̸rensen

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2007-29172, pp. 205-214; 10 pages
doi:10.1115/OMAE2007-29172
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4267-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME

abstract

For tensioned riser arrays in deep waters interference between individual risers in strong ocean current is a key design and operational concern. The lateral deflections are likely to be large, and the risers may experience collision with fatigue or surface damage as a consequence. In this paper a system consisting of a tension leg platform (TLP), a pair of risers, environmental forces and hydrodynamic interaction is presented. The control system is described, and a set of control objectives with corresponding control strategies are suggested. The collision avoidance effects of the different control objectives are shown through simulations.

Copyright © 2007 by ASME

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