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SPECIALIST COATINGS


FEATURE SPONSOR


TREATMENT IN ACTION FOR TIDAL POWER


Quoceant were contracted as part of the Meygen phase 1 tidal project, by turbine developer Andritz Hammerfest Hydro (AHH) to provide the cable management and connection system for their three 1.5MW HS1500 turbines


Jon Benzie, Senior Consultant Engineer at Quoceant explained: “The design challenge was to provide a system that was capable of enabling the remote connection of the export cable to the turbine support structure within a harsh and unforgiving subsea environment. This required a system capable of connection under dynamic conditions during installation while also ensuring cable motion was constrained during turbine operation. In addition, the system had to be reusable and capable of easy release to enable turbine maintenance and service.”


DEMANDING CRITERIA To meet these demanding criteria, Quoceant designed an innovative 2-stage system using a magnetic solution to provide permanent low-load retention with a secondary mechanical latch system for high load resistance to prevent large movements of the system


in the event of overload on the magnetic system. A key enabler for the system design was the specialist surface treatment used to protect the magnet connection plate.


“The surface of the connection plate required to be flat, smooth and magnetic to provide a high magnetic holding force, crucially it had also to be corrosion resistant for prolonged use subsea and hard to allow for ROV cleaning if marine growth required removal in the future,” added Jon.


SPECIFICATION


The solution Quoceant delivered used a thin High Velocity Oxygen Fuel (HVOF) sprayed coating of Tungsten Carbide Cobalt Chrome applied to a 55mm thick steel plate. This coating met all the operational specifications and was compatible with a steel substrate maximising the magnetic performance.


The cable management design was successfully incorporated onto all three AHH turbines and deployed as part of the world leading MeyGen tidal stream project located in the Pentland Firth, Scotland. Manufacture of the base steel plates was performed by AXYZ Engineering with Surface Technology providing the spraying and final finishing for the plates.


PROVIDING A SOLUTION


Speaking about the system, Craig Love, Engineering Manager, Andritz Hydro Hammerfest commented: “We have been very impressed with Quoceant’s input and expertise. They provided a solution that met our design needs in an innovative and robust manner.”


Quoceant SPECIALIST SURFACE


Tidal Technology Center Grevelingendam (TTC-GD)


initiative will be developed as a state of the art research, development and demonstration facility situated at the Flakkeese Spuisluis.


www.bt-projects.com 36 www.wavetidalenergynetwork.co.uk


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