Navantia-Windar have erected the first block corresponding to the first of the five spar-type floating foundations contracted by Statoil to the Spanish JV, for Hywind offshore wind farm.
The block weights approximately 70 t, and has a diameter of 14.4 m. The fabrication process starts with the bending of plates and forming of two large semi-circular sectors. This activity is accomplished in the same workshop, and followed by the welding of stiffeners in the horizontal position. After this, the two sectors are welded together in the horizontal position and erected into an advanced and highly automated production facility for welding of longitudinal and horizontal seams.
Five blocks with maximum weight of 800 t will be assembled in the line and moved onto the slipways for assembly of 90 m – long spar units and subsequent launching following yard standards for shipbuilding. The launching weight of the floating foundation is around 3200 t, including more than 1000 t of high density concrete.
The contract for fabrication of five floating foundations was awarded to the JV Navantia-Windar by Hywind Scotland Ltd, a subsidiary of Statoil, in the month of June 2015. The foundations are aimed for the Hywind Scotland pilot offshore wind farm, the first floating offshore wind farm off the Scottish coast. The offshore wind farm will be located near Buchan Deep, approx. 25-30 km off the coast of Peterhead in Aberdeenshire
The fabrication of the structures is taking place at the Navantia yard located in Fene (A Coruña – Spain), where Navantia-Windar are constructing 29 jackets foundations for Ibedrola’s Wikinger offshore wind farm.