SylWin alpha platform (2013)

SylWin Alpha platform, one of the world’s largest converter platforms has been installed off Sylt, an East Frisian Island in The Netherlands. The platform is so large and heavy that the ingenious “float-over method” has been used to lift it from a pontoon onto the already installed jacket base. This is the first time that a platform as large as SylWin alpha was installed using this method in the North Sea. The 14,000Mt SylWin alpha platform was transported on a pontoon, which was positioned in between the jacket legs. The platform was installed onto the legs of the jacket by ballasting the pontoon. The 83-metre long, 56-metre wide and 26-metre high SylWin alpha platform is the largest of its type. One of the world’s ‘strongest’ crane vessels is not strong enough to lift the SylWin alpha jacket. Therefore, the decision was taken to add additional buoyancy in the form of buoyancy tanks and to ballast the pontoon on site.

The SylWin alpha converter platform will serve as a “power socket” for wind farms, which together comprise 240 wind turbines and represent a generating capacity of 864 megawatt. The wind farms will be connected to the German high voltage grid.

PFF contribution:
The supply of two buoyancy tanks with an OD x L of 5 x 55 and 5 x 65 meters, total weight of 550 tonnes. The buoyancy tanks are equipped with water bulkheads, trunnions, reinforcement ribs, ballasting nozzles and manholes. The 12 weeks lead-time of the project (including production drawings) is successfully achieved.
Project management, production drawing development, project planning, inspection & field expediting, logistics and document review and control are also performed by PFF.