The spar concept as a floating vessel is now recognize as a reliable and economic option for developing deepwater offshore hydrocarbon reservoirs. Many of the advantages of the Spar concept are attribute to the variety of rise r systems that can be accommodated. This Paper presents a discussion of design considerations for the top tensioned and steel Catenary risers deployed from a Spar offshore production vessel. Results from extreme Event strength analysis, Spar motion and current-induced fatigue analysis, and a riser- To-riser wake interference analysis are presented.
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