The scope Our client was engaged on the eld development of a prospect within the Norwegian Continental Shelf. The concepts assessed included a semi-submersible oating production unit and a spread-moored FPSO. For each facility tie-back concept, the potential riser congurations and performance were to be assessed and optimised. The solution The semi-submersible concept was reviewed in phase 1 of the work, considering mid-water arch lazy-S and distributed buoyancy lazy- wave congurations. It was shown that the mid-water arch conguration gave acceptable loads and clashing results and was superior from a eld layout perspective for the conned spacing allowed around the existing semi-sub. The FPSO concept was reviewed in phase 2 of the work, considering compliant wave riser congurations,

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