The scope Our client had discovered an integrity problem during a routine inspection of their platform jacket. After performing a visual ROV inspection, the client’s jacket was found to be covered in a very large quantity of marine growth (over half a meter in some locations). We were asked to perform an analysis of the structure, including extreme wave and wave induced fatigue analyses. The solution A model of the jacket was built using survey data, with the appropriate thickness of marine growth on each member modelled individually. Over 300 dierent member and coating combinations were analysed in total. Extreme wave and current load cases were applied to the model and member stresses extracted. The stress utilisation factors of the jacket were calculated to ISO 19902. A wave induced f

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