An interesting article was published in the September 2014 issue of the NACE Materials Performance magazine. The article presents design considerations and some of the challenges a corrosion engineer encounters while designing a cathodic protection (CP) system for offshore wind turbine foundations. The authors were Sameer Ayyar, Jacob Jansson and Ruth Sorenson from COWI A/S Copenhagen, Denmark.

The study was supported by computer modelling where a number of options were evaluated. In the figure shown here the model results for an anode cage attached to a monopile structure at a level of -5 to -10m can be seen. The immersed surface of the monopile is bare. Corrosion protection is extended to all the external immersed surfaces and 5m below the mudline.

Project: London Array Offshore Wind Farm. Image source. COWI.

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