One of the standardized procedures used in the design of floating systems and their mooring and production lines is the so-called short-term design approach where the system is analyzed for some specific extreme environmental conditions. Along with this procedure, a nonlinear time-domain coupled dynamic analysis, considering the floater and its risers and mooring lines, can nowadays be incorporated as a feasible part of the design practice. One very important and challenging aspect of this process is concerned with the estimation of the characteristic short-term extreme values of the system response parameters based on the sampled time-series. In this paper a common procedure used to establish these extreme values for floater system response parameters, which is based upon a Weibull distribution model for the peaks of the time-series, is reviewed in the light of a recently proposed approach based on a general parametric model for the average conditional exceedance rate of peaks. It is shown that the former model corresponds to a particular case of the latter one. Numerical results are presented for the response parameters of a turret-moored Floating, Production, Storage and Offloading (FPSO) unit considering a short-term coupled analysis of the whole system under an extreme environmental condition of wind, wave, and current. Specifically, the extreme response of surge motion, top tension of the most loaded mooring line, and Det norske Veritas (DnV) codes utilization factor for the most critical section of an 0.20 m outer diameter SLWR (steel lazy wave riser) are investigated.
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November 2012
Structures and Safety Reliability
On the Extreme Value Analysis of the Response of a Turret Moored FPSO
L. V. S. Sagrilo,
L. V. S. Sagrilo
Laboratory of Analysis and Reliability of Offshore Structures, Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil, 21945–970
sagrilo@coc.ufrj.br
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A. Naess,
A. Naess
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, Trondheim, Norway, NO7491; Department of Mathematical Sciences, Norwegian University of Science and Technology
, Trondheim, Norway, NO7491
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Z. Gao
Z. Gao
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, Trondheim, Norway, NO7491
Search for other works by this author on:
L. V. S. Sagrilo
Laboratory of Analysis and Reliability of Offshore Structures, Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil, 21945–970
sagrilo@coc.ufrj.br
A. Naess
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, Trondheim, Norway, NO7491; Department of Mathematical Sciences, Norwegian University of Science and Technology
, Trondheim, Norway, NO7491
Z. Gao
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, Trondheim, Norway, NO7491J. Offshore Mech. Arct. Eng. Nov 2012, 134(4): 041603 (9 pages)
Published Online: September 17, 2012
Article history
Received:
September 28, 2010
Revised:
February 9, 2012
Online:
September 17, 2012
Published:
September 17, 2012
Citation
Sagrilo, L. V. S., Naess, A., and Gao, Z. (September 17, 2012). "On the Extreme Value Analysis of the Response of a Turret Moored FPSO." ASME. J. Offshore Mech. Arct. Eng. November 2012; 134(4): 041603. https://doi.org/10.1115/1.4006759
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