Heerema uses novel RNA technique to install first wind turbine at Arcadis Ost 1

The first of 27 Vestas V174 – 9.5MW turbines has been installed successfully at the Arcadis Ost 1 wind farm. Together with Heerema Marine Contractors and Vestas, Parkwind creates an industry first for the installation of wind turbines on a commercial scale.

In November 2019, it was initially revealed that Arcadis Ost 1 would employ a floating installation technique. The first Arcadis Ost 1 turbine was successfully installed floating after over 3 years of development and engineering on the part of the company. There are two key benefits to this novel approach. The first is zero seabed interaction, which is crucial in regions with deep water or difficult soils. An installation cycle that is shorter is the second benefit.

The lifting and assembly processes are carried out simultaneously to hasten the installation process. The pre-assembled WTG-tower is lifted to the foundation by one of the Thialf’s two major cranes, and the WTG is simultaneously pre-assembled by the other main crane.

Heerema created a technique for the latter that involves lifting the Rotor Nacelle Assembly (RNA) on a crane vessel’s “support” tower. The support tower offers a solid base that makes it possible to quickly and safely assemble the nacelle and the blades. Once pre-assembled, the entire RNA is carried in a single lift onto the WTG tower. Pre-assembling on board the Thialf guarantees complete control, resulting in a safe and extremely dependable installation environment. Key dangers associated with the floating installation are eliminated by the decreased number of lifts between the vessel and the structure. By creating new technologies to help the offshore floating installation, Vestas has produced RNA lift-feasible components.

Arcadis Ost 1 is a 257 MW wind farm built by Parkwind that is situated in the German Baltic Sea territorial seas, northeast of the island of Rügen. It will provide enough clean energy to power up to 290,000 homes. It is both Parkwind’s first foreign project and the first wind farm in Europe to use the V174-9.5MW turbines from Vestas. The installation campaign began in June 2022, and the ultimate commissioning of the wind farm is scheduled for 2023.

Image source: Heerema

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