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Squall Response Based Design of Floating Units in West Africa

[+] Author Affiliations
Juan Alvarez, Michel François

Bureau Veritas, Neuilly Sur Seine, France

Pierre Orsero

UTC, Compiegne, France

Valerie Quiniou-Ramus, Anne-Gaëlle Moysan, Didier l’Hostis, Alain Ledoux

TOTAL, Paris, France

Paper No. OMAE2011-49237, pp. 233-242; 10 pages
doi:10.1115/OMAE2011-49237
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Polar and Arctic Sciences and Technology
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4433-5
  • Copyright © 2011 by ASME

abstract

Squalls are one of the main issues for the design of West Africa floating units mooring systems. At the present time and due to the lack of more relevant information and models, squalls are represented by on site time series of time varying wind speed and relative heading. The first FPSO units were designed on the basis of a reduced Squall database. Nowadays, the number of squall records has been significantly increased and a response based analysis can be carried out. The present paper is focused on the Gulf of Guinea environment. The area has been divided into two zones: North (Nigeria[[ellipsis]]) and South (Congo, Angola[[ellipsis]]). This approach enabled us to deal with 90 Squall events for North zone and 115 Squall events for South zone. Two different mooring systems, with quite different natural periods, have been investigated in order to cover the range of already installed spread moored FPSO’s. For every Squall of the database, time domain and modal simulations have been carried out in order to obtain the maximum values of the axial tension in mooring lines and of the offset of a standard spread moored unit. Then a statistical procedure is applied a) to estimate 100-year return period values for these parameters and b) to assess overall trends besides the differences between results from both zones and both mooring systems. A comparative study has also been carried out to relate the 100-year return period extrapolations with the values derived from classical design procedures in order to evaluate the potential design margins for extreme responses. Finally, areas needing further investigation are identified.

Copyright © 2011 by ASME
Topics: Design

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