After a year of successfully testing the Slip Joint connection, the DOT wind turbine is decommissioned

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Topsector Algemeen
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Slip joint connection

After a year of successfully testing the Slip Joint connection, the DOT wind turbine is decommissioned and brought back to shore. With the removal of the DOT wind turbine all phases of this concept’s lifetime are investigated and successfully put to the test.

The Slip Joint is an alternative connection between an offshore wind turbine and its foundation. It works and looks like two paper cups upside down stacked on top of each other. The connection is based on friction, where the weight ensures a firm and stable connection. Installation is done by simply sliding the wind turbine over the monopile without the use of grout or bolts. This simple mechanism allows for cost reduction in material, equipment & personnel as well as allowing for a shorter installation time. It is the first time a slip-joint connection is deployed offshore.

The DOT wind turbine was located in Eneco’s Princes Amalia Wind Park off the coast of IJmuiden, the Netherlands. The complete wind turbine was picked up in a single lift from its monopile foundation to be transported towards and backloaded on the quay for further onshore decommissioning.

With the removal of the wind turbine all necessary data regarding the Slip Joint connection is successfully gathered and is now being processed and used for validating by the project partners.

This is a great step forward to commercialisation of this TKI Wind op Zee supported project. Here you can find a video of the decommissioning.