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Aasta Hansteen spar
The Aasta Hansteen FPSO spar is a Spar gas platform designed by Technip-USA, currently being built by Hyundai Heavy Industries in South Korea. Once complete it will be transported on its side on board the Dockwise Vanguard Heavy Transport Vessel (HTV) to a fjord in West Norway. The Spar hull will be upended in the fjord, topsides installed using floatover technique and then towed vertically to the Aasta Hansteen gas field 300 km off the coast of Norway. The spar will be tethered north of the Arctic Circle using polyester moorings to the seabed 1300m below.〔(【引用サイトリンク】url=http://www.subseaiq.com/data/Project.aspx?project_id=720 )〕 At a height of 198m (of which 177m will be submerged) and diameter of 50m this will be the biggest spar platform hull ever built in terms of diameter and displacement. The spar hull will be a Truss Spar type allowing condensate to be stored in the hull beneath sea level and offloaded to a shuttle tanker. The produced gas will be exported to the shore with rigid Steel Catenary Risers (SCR). The Production import risers will also be SCRs, first time of application of SCRs in North Sea.
==Design==
Once on site it will be partially submerged by filling ballast tanks to 177 m and anchored to the seabed, leaving only the top 21m above the surface. The seabed moorings will be primarily made of cut resisitant polyester and steel chain.
The Aasta Hansteen spar will export the natural gas from the field through the yet to be build Polarled pipeline to the Nyhamna processing plant on the Norwegian coast.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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