PHILLIPS - JUDY
North Sea, UK - 1996-2003

Platform
The Judy platform is a North Sea platform located in 240 ft of water in the UK sector.

Challenge
MSL is the retained structural consultant for the Judy platform. Since Judy is a key asset for Phillips, MSL provides a 24 hour rapid analysis response for any incident such as fire, blast or ship impact.

MSL Scope

The project was divided into the following three phases:

• Phase one included developing structural models for the jacket, the topsides and the flare tower. Benchmark developed models against the design models. Perform verification analyses such as: in-place strength and fatigue checks of the jacket, strength check of the topsides. Perform nonlinear pushover analyses to determine the platform reserve strength ratio.

• Phase two included collect monitored accelerations from Judy and select few records relevant to structural response. Subject jacket model to recorded sea environment and compare measured to computed responses. Adjust structural analysis recipe to represent field records.

• Phase three was to develop and optimize an inspection plan for the platform via a reliability-based analysis including uncertainties in fatigue life prediction models, stress concentration factors and stress-strain relationships. Use Bayesian techniques to develop inspection intervals.

• Phase four was to reassess structural integrity of platform and topsides due to payload increase associated with tying the platform to neighboring fields. Modify models to reflect the structural and payload changes. Perform linear design check analyses of topsides model and jacket. Assess effect of topsides increase on fatigue life of platform joints. Perform nonlinear pushovers to determine modified reserve strength ratio.

        Judy Platform - North Sea, UK

         Judy Field Layout

Judy in the Fabrication Yard