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Touchdown Analysis of Jack-Up Units for the Definition of the Installation and Retrieval Operational Limits

[+] Author Affiliations
Gérson B. Matter

ABS Consulting, Rio de Janeiro, RJ, Brazil

Ricardo Rios M. da Silva

Petrobras S.A., Salvador, Brazil

Pao-Lin Tan

American Bureau of Shipping, Houston, TX

Paper No. OMAE2005-67587, pp. 1115-1121; 7 pages
doi:10.1115/OMAE2005-67587
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

The paper presents the development of a methodology for the definition of the operational limits for Self-Elevating Units, during the “jack-up” and “jack-down” operations. The methodology is based on the structural analysis of the unit during the impact between the spud can and the soil. The mechanics of the impact is based on the first principle of Momentum Theory and the Virtual Work Theory. The study includes the development of a motion analysis in order to obtain the allowable maximum wave heights that guarantee the integrity of the unit.

Copyright © 2005 by ASME

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