Windturbine Cathodic Polarisation Results; A Case Study (C2026-00091)
Wednesday, March 18, 2026
3:00 PM - 3:30 PM Central
Location: 360 DE
Earn .5 PDH
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One of the mysteries of offshore cathodic protection (CP) is the time it takes to full polarisation. Standards like DNV RP B-401 and NACE SP-0176 specifiy current densities to afford protection, and call out intial, mean and final current density values. However the standards do not mention the time to full polarisation. In the interest of better understanding for the industry our company, who have undertaken numerous retrofits and new build with monitoring systems, share data where possible. A number of windturbines located in offshore waters off the coast of Germany in the North Sea, were fitted with a close mounted impressed current cathodic protection (ICCP), but failed within a few years, and consequently many turbines were left under protected and some at freely corroding potentials. A retrofit ICCP was urgently installed to provide protection to the fully and semi depolarised structures. This paper demonstrates that how a retrofit can be fitted and commissioned within 48 hours and as we could monitor the output and potentials understand the current and time for polarisation.
