May 4, 2005

To develop and demonstrate a two-tier evaluation methodology for determining the adequacy of existing fixed offshore platforms. The first step of this methodology is planned to have of a relatively easy matrix screening system incorporating the more important and sensitive design parameters which may impact the actual adequacy of existing platforms. A platform which `passes` such a screening system would be deemed adequate and would not be subject to further evaluation.

Complete. Parameters affecting platform failures were reviewed and categorized as to their relative importance in initiating overall platform failure. Cooperation was obtained in discussing the past failure mechanisms with oil company personnel. Platform components such as tubular legs and braces and chord joints can typically fail in several modes when subjected to stresses in excess of their strength. Platform piles and the foundation can also initiate local failures. Conoco's Grand Isle platform was used to generate the applied extreme environmental loads which will be used to evaluate platform component response

Reports

Post Mortem Platform Failure Evaluation Study: Guidelines for Assessment of Platform Requalification Analysis Results, Report submitted by International Design, Engineering and Analysis Services, Inc., January 1995.

Hogan Platform: Trail Application of API RP 2A Section 17, International Design, Engineering and Analysis Services, Inc., August 1994.

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