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Influence of the Ballast Tanks Loading on the Allowable VCG in Damage Case

[+] Author Affiliations
Guilherme Rueda, Bruno Madella, Kazuo Nishimoto, Fabio Matsumoto

University of São Paulo, São Paulo, SP, Brazil

Paper No. OMAE2006-92275, pp. 289-294; 6 pages
doi:10.1115/OMAE2006-92275
From:
  • 25th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Wind Energy; Ocean Research Technology; LNG Specialty Symposium
  • Hamburg, Germany, June 4–9, 2006
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-4746-2 | eISBN: 0-7918-3777-7
  • Copyright © 2006 by ASME

abstract

The aim of this paper is the study of the Allowable VCG in monocolumn offshore platforms. As study case the MonoBR — an innovative conceptual unit developed by a partnership of PETROBRAS/CENPES and University of São Paulo — was analyzed. The studies were carried out during the design of MonoBR for the Walker Ridge area, Gulf of Mexico. The effect on the stability of the unit caused by a damaged tank depends on its loading condition, since there is lost of both, buoyancy and mass, modifying unit’s displacement and center of gravity. In other words, depending of the tank loading, the amount of water that enters or leaves the unit in a damage case may vary widely. In this paper is presented the methodology adopted in the study of influence of the ballast tanks loading in the Allowable VCG curve in MonoBR, introducing this other variable beyond the draft, the usual single variable in AVCG curves. At the end are presented the main results for the study case, whose AVCG can vary by 50% for the same draft depending of the tank loading.

Copyright © 2006 by ASME

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