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Collision Prevention of Two Different Top Tensioned Risers by Automatic Control

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

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2008-57496, pp. 463-470; 8 pages
doi:10.1115/OMAE2008-57496
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

It has previously been demonstrated that collision between two identical risers in a tandem arrangement can be prevented by controlling the payout of the heave compensators. A control strategy based on “equal effective length” will in an effective way cause the two risers to respond dynamically in parallel. This effect might, however, be more difficult to obtain if the two risers are different with respect to diameter, weight and tension. In this paper a system consisting of a tension leg platform (TLP) and two different risers is presented. The control strategy previously applied to two identical risers has been used in this case as well. Slowly varying and wave frequency surge motions are introduced in order to create dynamic response that normally would lead to collision between the risers. From this study it can be concluded that the control strategy previously applied for identical risers in tandem will also be effective for risers with significantly different design parameters such as diameter, top tension and effective weight.

Copyright © 2008 by ASME

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