Offshore Cathodic Protection, Structures and Pipelines London Branch, of The Institute of Corrosion Abstract Presenter Bob Adey, Tim Froome Affiliation: Beasey Ltd. Title: Modelling of CP systems for submerged and buried monopiles Timing and Session: Day 1 Session 1 Monopiles are a widely adopted foundation system for offshore wind energy facilities. They present many challenges to CP designers. The purpose of the presentation will be to describe and demonstrate the latest modelling capabilities and how these can be used to inform CP design of the external and internal surfaces of a structure. It will be shown how modelling can take account of: The water flow rate profile and its impact on current demand The development of calcareous deposits, and the capability at the end of the CP system design life of an anode configuration to re-create those deposits (in the event of storm damage for example) The effect of progressive change over time of coating breakdown factors The effect on anode output as they are progressively consumed over the system design life The anode output efficiency losses associated with dense arrangements of anodes within carrier frames Interference effects between mixed impressed and sacrificial systems Return path losses (eg at the Transition Piece to Monopile connection) and more It will be shown how modelling provides a facility to readily evaluate alternative CP system solutions, and to test the effect of alternative assumptions, which provides input for CP designers to make an informed selection of the final CP design. The same underlying modelling principles can be applied to alternative wind turbine structures (eg tripods, tethered floating, and structures manufactured with reinforced concrete rather than steel).