Client: Dana Petroleum Location: UK North Sea The Western Isles Development Project will be developed using a floating production, storage and offloading (FPSO) facility. Oil will be exported by shuttle tanker and excess produced gas will be exported through a dedicated pipeline to Tern-NC gas line. The subsea facilities will be tied back to the floating production facility by a subsea pipeline bundle including flexible risers. Water injection is required to maintain the reservoir pressure and gas lift is also required to assist production. Scope Flow assurancePipeline mechanical and structural designDesign and specification of flowline and pipeline and tie-in systemsDynamic analysis of the flexible riser systemControl system and umbilical designEPCI cost estimate and scheduleITT bid evaluation.Features Multidisciplined integrated service offeringFull suite of subsea FEED engineering to support EPIC tenderingExperienced flexible riser team.Lessons learned Multiple FPSOs required 18 month FEED in order to develop subsea solutions for three FPSO optionsTwo separate EPCI ITTs required due to lack of decision on FPSO selectionLarge number of risers versus MWA versus flow assurance complexityDecisions with manifold size and well count delayed until late in FEED – requirement for reworkExport / import pressure discussions with Tern early in FEED.