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Renewable energies

In our business segment renewable energies we are a service provider for steel construction in offshore wind power plants. We are specialising in parts that are used in jacket foundations, transition pieces and substations.

Using an inductive bending process, we are fabricating so-called J-pipes, which are J-shaped pipes with different diameters and wall strengths for jackets. J-pipes are used to protect the cables that lead from the rotor to the bottom of the ocean.

Pipe bending and components for offshore wind power plants

Transition pieces
For transition pieces, we are also fabricating components for maintenance platforms and jetties. Our bent pipelines and components make expensive expensive welding seams unnecessary and also extend the service life of plants.

Borkum Riffgrund 2

Wind power for 460,000 households

The offshore wind farm is built by Dong Energy and with a total capacity of about 450 MW it will feature the largest wind power plants in the German North Sea – 56 8 MW-class turbines made by MHI Vestas with a rotor diameter of 164 m. Borkum Riffgrund 2 will produce enough CO2-free power to cover the annual consumption of approximately 460,000 German households.

The fabrication of inductive bends is one of the major technical challenges of this project. The required combination of diameter and wall thickness (419 mm x 10 mm) as well as bending radius (R = 2,700 mm) is very demanding with respect to the requested ovality tolerances. A procedure test proved the feasibility of a fabrication according to these parameters.

Beside the mere bending of the so-called J-pipes, which serve as protective pipes for the cables leading from the rotor down to the sea floor, the scope also includes additional services such as the welding of multiple components into spools that are up to 25 m long.

Fact sheet


ST³ Offshore sp.zo.o.

Order parameters

J-pipes and spools for 56 wind power plants

Production activity

approx. 7,000 working hours

Fabrication period

December 2016 - October 2017



Jens Buchberger, head of the Fabrication business unit and general manager of FINOW Rohrsysteme GmbH

"After having fabricated several orders for offshore projects like Burbo Bank, Walney, Race Bank and Veia Mate, we at FINOW now reach a significantly higher in-house production depth with the new order for Borkum Riffgrund 2."

Our reference projects

Your contact person

Jens Buchberger

Angermünder Straße 101
16225 Eberswalde

+49 3334 570

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