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Lazy-Wave Steel Rigid Risers for Turret-Moored FPSO

[+] Author Affiliations
Ana Lúcia F. Lima Torres, Enrique Casaprima Gonzalez, Marcio Martins Mourelle, Renato Marques Correia da Silva

Petrobras, Rio de Janeiro, RJ, Brazil

Marcos Queija de Siqueira, Claudio Marcio Silva Dantas

Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2002-28124, pp. 203-209; 7 pages
doi:10.1115/OMAE2002-28124
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3611-8 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

The free-hanging SCR (Steel Catenary Riser) was adopted by Petrobras as a cost-effective alternative for oil and gas export lines on deepwater fields, where large diameter flexible risers present technical and economic limitations. It is considered an available technology for semi-submersible application. There was interest in applying SCR’s attached to FPSO (Floating, Production, Storage and Offloading) units due to the trend of using these units for exploration and production in Brazilian deep waters. This alternative has to be carefully studied due to the high offsets and heave motions imposed by the vessel on the top of the riser. This work presents the approach and methodology adopted in Petrobras to study the structural integrity and feasibility of a lazy-wave SCR attached to a bow turret-moored FPSO at a water depth of 1290 m. The analysis was performed using the Petrobras’s in-house computer codes ANFLEX and POSFAL developed and implemented as part of projects from CENPES with “COPPE/UFRJ - The Engineering Post-Graduating Coordination of the Federal University of Rio de Janeiro”. For VIV (Vortex Induced Vibration) fatigue damage calculation SHEAR7 was used.

Copyright © 2002 by ASME

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