Dutch offshore companies realized a unique operation in the North Sea. Under the direction of Seaway Heavy Lifting, one of the world’s largest convertor platforms – a “power socket at sea” – has been installed to the west of Sylt, the East Frisian island.
At 83 meters long, 56 meters wide, and 26 meters high, the SylWin alpha platform is the largest of its type. Because it is so large and heavy the ingenious “float-over” method has been used to lift it from a pontoon onto the already installed “jacket” (the base of the platform). Earlier this year, Seaway Heavy Lifting used its crane vessel Oleg Strashnov to install the jacket.
Siemens commissioned Seaway Heavy Lifting (based in Zoetermeer, the Netherlands) to perform the unusual operation, which in turn called in the assistance of maritime service providers Dockwise and Mammoet. The 14,000Mt
SylWin alpha platform was transported on a pontoon that was positioned in between the jacket legs. The platform was installed onto the legs of the jacket by ballasting the pontoon. Dockwise was responsible for this phase. Mammoet then used jacks to lift the platform into its final position on the jacket.
The SylWin alpha converter platform will serve as a “power socket” for the DanTysk, Sandbank, and Butendiek wind farms, which together comprise 240 wind turbines and represent a generating capacity of 864 megawatt.
You will find an animation of the project via the following link youtu.be/Rm2-XGv9jW8
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