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New Insights in Turret Mooring Systems Yaw Dynamics

[+] Author Affiliations
François Caille, Julien Prieur, Naciri Mamoun

SBM Offshore, Monaco

Paper No. OMAE2014-24490, pp. V01BT01A042; 9 pages
doi:10.1115/OMAE2014-24490
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1B: Offshore Technology
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4538-7
  • Copyright © 2014 by ASME

abstract

Owing to friction in the weathervaning system and in the swivel stack of a turret-moored FPSO, the turret can be locked to the FPSO in day-to-day environments meaning that no relative yaw motions occur in such conditions. When the FPSO yaws sufficiently, the mooring yaw restoring moment builds up to a point where the friction torque is overcome freeing within seconds the turret from the FPSO which then yaws back towards its neutral yaw position. This phenomenon is referred to as a turret release event. Evidence of the existence of such a phenomenon has been confirmed for one North Sea FPSO. In this paper, the basic physics of turret release are investigated from first principles. Incorporation of a friction module in a readily available time domain simulation software is described. Application of this enhanced tool towards a better understanding of the FPSO/Turret relative yaw motions & velocities during the FPSO service life is then discussed in the context of existing SBM Offshore turret systems.

Copyright © 2014 by ASME

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