Installation
Installation
Beyond using our slip joint technology to install wind turbines, DOT supports innovations on pile driving technology, monopile design and cable and pipeline installation. As an example, DOT is involved in the development a gentle driving of piles (GDP) concept for the installation of monopiles. GDP helps decrease the LCoE by decreasing costs of monopile installation while maintaining current levels of predictability and feasibility. On top of that GDP decreases environmental impact of monopile installation by reducing harmful noise and enabling full recovery of monopiles during removal.
Process Timeline
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Gentle driving of piles research project
Design, construction and testing of a small scale GDP shaker onshore in Rotterdam proving the GDP concept in sand.
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Floating installation of an XXL offshore wind turbine
Demonstrating floating installation of our large offshore wind turbine combining Heerema’s Rotor-Nacelle assembly with the slip joint technology. Successful demonstration of:
- Rotor Nacelle assembly
- Slip joint based seafastening
- Nacelle – Tower slip joint
Other innovations
All our innovations are supported by an extensive track record of studies, prototypes and offshore testing. Our approach is to “put steel in the water”: relentlessly testing the concepts in its designated environment of operation.
Hydraulic Drivetrain
The core of the DOT concept is a sea water pump directly driven by the turbine rotor. It is capable of slow rotation speed, high pressure and high-power output.
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Wind Turbine
Operating a water-pumping wind turbine allows for different control strategies. DOT develops these during the integration of the pump in different turbine platforms.
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Pelton Turbine
Power conversion from high-pressure seawater is done using hydropower technology a pelton wheel driving a generator. DOT creates an unprecedented 4km hydraulic head.
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Reverse Osmosis
High pressure seawater can also be used through a reverse osmosis system. The DOT turbine takes out several energy conversion steps to arrive at renewably cleaned water for drinking, irrigation or H2 production.
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Slip Joint
Speedy installation of the thousands of megawatts offshore wind is crucial to meet the Paris goals. The slip joint removes many cumbersome offshore handling operations, allowing single lift turbine installation.
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Installation
Beyond the slip joint, DOT supports innovations on pile driving technology, monopile design and cable and pipeline installation. The “steel in the water” drive makes DOT a valuable partner in Joint Industry Projects.
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