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Ensuring operational integrity for wave power project

2nd July 2014


The Oyster 800 wave energy project from Aquamarine Power

Aquamarine Power has ordered RotaBolt measurement technology for its Oyster 800 wave power project which captures the energy in nearshore waves and converts it into clean sustainable energy. The fasteners will be fitted to an underwater flange that is part of the system’s main 'water hydraulics.'

The technology incorporated into each RotaBolt fastener assures that the correct tension is achieved at installation and then throughout the life of the bolted joint. The design features a RotaCap on the top of the bolt which allows for instant finger-tip checking of correct tension, making it suitable for applications where operators are looking for operational integrity and also maintenance savings.  

The Oyster 800 project is situated off the Orkney Islands and has been operational since 2012. Essentially it is a wave powered pump consisting of a buoyant, hinged flap which is attached to the seabed at depths of between 10 and 15 metres, around half a kilometre from the shore. 

The hinged flap, which is almost entirely underwater, pitches backwards and forwards in the nearshore waves. The movement of the flap drives two hydraulic pistons which push high pressure water onshore via the subsea pipeline to drive a conventional hydro-electric turbine.  

The project is being continually refined and improved by Aquamarine Power and it is expected that next winter’s weather will provide a fuller testing of RotaBolt’s ability to assure integrity, before a final assessment is made next spring. The hydraulics system has a number of flange connections which could potentially also benefit from RotaBolt technology. 

The use of RotaBolt measurement technology is growing across renewable energy. The offshore wind sector is increasingly turning to the benefits of the technology on both turbines and foundational structures, and in wave and tidal power RotaBolts are currently being piloted and assessed on a number of projects.   









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