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Fatigue Analysis and Risk Based Inspection Planning for Life Extension of Fixed Offshore Platforms

[+] Author Affiliations
Michael Havbro Faber, Daniel Straub

Swiss Federal Institute of Technology, Zürich, Switzerland

Partha Chakrabarti, Ibrahim Abu-Odeh

Zentech, Inc., Houston, TX

Juan de Dios de la O. Ramírez

Pemex Exploración y Producción, Ciudad del Carmen, Campeche, Mexico

Paper No. OMAE2005-67229, pp. 511-519; 9 pages
doi:10.1115/OMAE2005-67229
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 present paper reports on the application of Risk Based Inspection (RBI) planning as conducted on a recent project for Pemex Exploración y Producción. The project considers the engineering assessments required for a possible service life extension of 23 fixed steel jacket structures located in the Bay of Campeche. In the project RBI plays an important role as this quantifies the relation between the overall performances of the platforms in their present condition with their future deterioration and facilitates the identification of strategies for cost efficient condition control by means of targeted inspection and maintenance activities and if necessary repair and strengthening. For the purpose of facilitating efficient RBI for larger number of structures of more or less similar characteristics, a generic scheme for RBI is pursued. The specific aspects of the generic RBI for the considered group of structures in regard to risk acceptance criteria, modeling of inspection qualities and the probabilistic fatigue and fracture mechanical modeling are outlined. Finally also a study is reported whereby the benefit of the RBI approach is assessed as a means of risk control in comparison to standard code based requirement for inspection planning.

Copyright © 2005 by ASME

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