France – Wednesday 2017, 08 02 – energiesdelamer.eu. ARKONA electrical offshore substation assembly and installation of jacket piles in the Baltic Sea are completed.
Less than three weeks after laying the first block, the STX France team has laid the third and last block of the Arkona project (a joint venture of E.ON and Statoil with transmission system operator 50Hz) electrical offshore substation topside onto the transportation barge in the drydock of the yard in St. Nazaire.
In the meantime, the offshore works at the ARKONA wind farm site have started with the installation of the 4 piles of the substation jacket foundation. The substation is one of the biggest HVAC (high voltage alternating current) substations ever built – 5000 tons (4000 tons topside and 1000 tons jacket), transmitting a total of 385 MW power – and will be delivered in 2018.
Project is running according to schedule
The three blocks of the topside are now assembled on the barge which will be used for the transport offshore in spring 2018. Equipment installation and commissioning will continue until 2018 on the barge in the dry dock in St. Nazaire.
In the meantime the jacket fabrication is in progress in a dedicated workshop in Saint-Nazaire.
The substation is one of the biggest HVAC (high voltage alternating current) substations ever built – 5000 tons (4000 tons topside and 1000 tons jacket), transmitting a total of 385 MW power – and will be delivered in 2018.
Last week STX, with subcontractor SHL, the first part of the offshore installation took place in the Baltic sea. SHL Heavy Lift Vessel Oleg Strashnov (corporate member of the group Subsea 7) has installed the pile foundation for the jacket. Due to close and trustful collaboration of all involved parties the project is in line with the schedule. A full EPCIM contract which makes of STX France one of the major European industrial stakeholders of the Energy transition.
From the contract award in July 2015 up to the fabrication start, STX France team has carried out the design of ARKONA electrical substation. Building of the topside and the jacket have been realized in the Offshore Energy dedicated workshop of STX’ Saint-Nazaire yard. The contract includes the transport, the installation and one year maintenance period.
Finally, looking forward the biggest single lift for an HVAC substation so far – 4000 tons – will be carried out next spring. This will be a key achievement in the offshore wind market.
Source : STX France – Press Release
Points de repère
27/04/2016 – STX équipera Arkona, parc éolien offshore en mer Baltique construit par E.on et Statoil
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The Oleg Strashnov is a unique hull shape and is outfitted with the latest technology. Its 5,000 tonnes revolving crane has a main hook lifting height of 102m. There are 800 tonnes and 200 tonnes auxiliary hooks and a 30 tonnes trolley hoist. With generous deck space totalling 3,700 sq. m (8,500 tonnes load capacity) the Oleg Strashnov represents the ideal vessel for the installation of large, heavy structures. It is also equipped for the installation of TLP/SPAR foundations and topsides, together with the in-field installation of modules on FPSOs.
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