Petrobras R&D Center developed feasibility studies of the lazy-wave configuration of steel catenary risers (SLWR) connected to a turret-moored FPSO and to the border of a spread-moored FSO, in Campos Basin, at water depths of 1290m and 1800m, respectively. In both projects the fatigue analysis considered the bimodal/bidirectional characteristics of sea-states. Special methodologies for environmental data statistical treatment and riser fatigue analysis were developed. This paper presents the study performed to evaluate the importance of considering the bimodal/bidirectional characteristic of Campos Basin sea-states in the steel catenary risers (SCR) fatigue damage verification.

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