Monopiles & transition pieces
We have transformed numerous customers’ specifications into long-lasting offshore steel foundations.
Our starting point is our customers' needs
Monopile foundations are among the most popular offshore wind foundations in the market and have been used widely in offshore wind over the last few decades. The monopile is a construction consisting of a steel pipe with a diameter ranging from approximately 5-6 meters and up to 15 metres in diameter.
The monopile itself is piled into the seabed using a large hydraulic hammer. The length of monopiles range from 20m to more than 120m and the weight ranges from 300–2,800 tonnes.
Monopiles can be divided into segments according to diameter:
- Regular monopiles: 5-6 metres
- XL monopiles: 6-8 metres
- XXL monopiles: 8-11 metres
- Mega monopiles: more than 11 metres
Over the years, we have transformed numerous customers' specifications into long-lasting offshore steel foundations and have accumulated unique technical expertise in this field.
Since 2002, we have been involved in the fabrication of more than 2,900 foundations, and have gained extensive experience with this process – and with fabrication and mounting of external platforms as well as mounting, and installation of both static anodes, and dynamic ICCP corrosion protection systems.
XL and XXL foundations are produced as regular foundations, but important elements in the fabrication process demands that facilities and production logistics are in order.
A transition piece is made up out of a steel pipe construction and is part of the foundation for an offshore wind turbine. The transition piece is directly connected to the monopile foundation and is secured to the monopile by use of a bolted, or grouted, connection.
Transition pieces connect the turbine tower with the monopile and hold essential components including platforms, ladders and boat landing systems, which enable technicians and engineers to enter the turbine tower to do repair and maintenance work.
The transition piece is painted yellow to improve visibility once the tower and turbine is installed offshore. With current designs transition pieces are up to 35m long and weigh approximately 150–600 tonnes.