SylWin Alpha platform installed

GERMANY: Seaway Heavy Lifting has installed the SylWin Alpha offshore convertor platform in the German North Sea.

The Sylwin Alpha platform ready to sail at Rostock port
The Sylwin Alpha platform ready to sail at Rostock port

Siemens, which is overseeing the project, enlisted the company to install the 14,000-tonne platform on an already-installed jacket west of the island of Sylt.

The platform was transported on a pontoon that was positioned in between the jacket legs, from where it was installed by ballasting the pontoon.

Earlier this year, Seaway Heavy Lifting used its Oleg Strashnov crane vessel to install the jacket. Due to the exceptional weight of the jacket, the crane vessel was not strong enough to lift it. Therefore, the decision was taken to add additional buoyancy in the form of buoyancy tanks and to ballast the pontoon on site.

The platform will serve the DanTysk, Sandbank and Butendiek wind farms, which together comprise 240 turbines and represent a generating capacity of 864MW.

The convertor transforms the alternating current (AC) power generated by the turbines into high-voltage direct-current (HVDC) that is transported via a 160-kilometre seabed cable and a 45-kilometre underground cable to the onshore Büttel high-voltage station.

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