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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.