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A Novel Application of Constrained NewWave Theory for Floatover Deck Installations

[+] Author Affiliations
Lee A. O’Neill, Emmanuel Fakas, Mark Cassidy

University of Western Australia, Perth, WA, Australia

Paper No. OMAE2004-51099, pp. 165-174; 10 pages
doi:10.1115/OMAE2004-51099
From:
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME

abstract

Numerical techniques are extensively used to predict vessel motions and associated contact forces for offshore operations such as lift and floatover deck installations. The accuracy of such predictions however is highly dependent on the comprehensive modelling of seastate conditions, which is often limited by computational power and time constraints. A time-efficient methodology, suitable for modelling large numbers of installation seastates, is developed to alleviate this problem. The methodology is based on the Constrained NewWave model which has been previously used to overcome similar problems. However this has only been for individual, extreme storm conditions. The accuracy, time-efficiency and practicality of the revised methodology is demonstrated by means of direct comparison of simulation results obtained for a floatover deck installation on the North West Shelf of Australia. The ability to perform large number of simulations in a time and cost efficient manner is of paramount importance in assessing the system limitations to varying installation conditions, a case that has always been challenging to designers during the development of oil and gas projects. Such flexibility improves confidence in the overall system, necessary for the accurate assessment of the commercial viability of marginal developments.

Copyright © 2004 by ASME

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