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Service Life Reduction of a Top Tensioned Vertical Riser and VIV Effect

[+] Author Affiliations
Cyntia G. da Costa Matt, Ricardo Franciss

Petrobras, Rio de Janeiro, RJ, Brazil

Celso K. Morooka, Fabio M. Coelho

State University of Campinas, Campinas, SP, Brazil

Paper No. OMAE2006-92292, pp. 319-325; 7 pages
doi:10.1115/OMAE2006-92292
From:
  • 25th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Wind Energy; Ocean Research Technology; LNG Specialty Symposium
  • Hamburg, Germany, June 4–9, 2006
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-4746-2 | eISBN: 0-7918-3777-7
  • Copyright © 2006 by ASME

abstract

In the present paper, a brief introduction of the fundamentals of TTR dynamic behavior is provided along with service life estimation utilizing numerical simulations in time domain. The simulation of riser motions due to environmental loads, ocean waves and marine current, was carried out along with bending moment and stresses. In-line and transverse riser behavior will also be considered. Vortex induced vibration (VIV) in risers due to waves and current is modeled. Riser service life calculations are shown with and without the influence of VIV. Lateral motions and offset at the top of the riser due to the surface floating production unit also are considered in the simulation. Time series from numerical simulations are presented for different environmental conditions with explanation regarding the impact on riser service life.

Copyright © 2006 by ASME

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