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    Hallin completes installation of huge tidal turbine

    Projects and Operations // September 3, 2010

    Hallin Marine Subsea International Ltd, a Superior Energy Services company, has successfully completed installation of what is believed to be the world’s largest rotor diameter subsea tidal turbine, the AK-1000.

    The 1MW subsea tidal power turbine was installed at the European Marine Energy Centre (EMEC) in the Orkney Islands, Scotland.

    Hallin was contracted by Atlantis Resources Corporation (ARC), one of the world’s leading developers of tidal power technology, to provide specialist services as an experienced subsea contractor to plan, help design and install the huge, cutting edge turbine.

    The AK-1000 turbine and supporting structure weighs 1,300 tonnes and was deployed in the harsh open ocean environment of the North Sea around the Orkney Islands.

    The twin rotor turbine has a rotor diameter of 18m, each blade being 7.8m in length, with a cone diameter of 2.4m. Overall the full structure is in excess of 25m height and was installed in depths of 35m.

    By its nature, the site chosen for the generator has strong currents that are required to operate the rotor. This obviously caused major installation concerns when developing the work programme.

    The tidal regime and vessel selection were the critical factors for the planning with a need to optimise the time available during slack water periods for the installation.

    Hallin’s project team’s careful management of the construction planning took into account the tidal regimes and, in close cooperation with the design team, optimised the size of component parts, at the manufacturing stage, to ensure that the build assembly during installation was compatible with the time allowance during each period of slack water.

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