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Internal ICCP of Offshore Wind Monopile Foundations

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Despite rapid development of electricity generation from wind compared to other renewable power sources in recent years, much greater efforts are still required to achieve the current level of sustained capacity growth to get on track with the Net Zero Emissions (NZE) by 2050 Scenario. One of the main challenges remains around the sustainability and cost reduction efforts for the offshore wind sector, especially related to operation and maintenance (O&M) costs. Monopiles, the most common foundation type in offshore wind farms, just like any other submerged metal structures are susceptible to corrosion, the maintenance of which could be very costly.


Corrosion prevention of the inside of a monopile structure has been challenging until today.

Product Number: 51323-19376-SG
Author: Christophe Baete, Aldrich Tyto
Publication Date: 2023
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$20.00
$20.00

Monopile structures represent the majority of offshore wind foundation structures. In the early days, monopiles were designed with watertight platforms to prevent oxygen ingress that may lead to internal corrosion. In practice, some water exchange occurs due to failure of the watertight system. Today monopile foundations with replenishment holes are more common.


This paper discusses the application of impressed current cathodic protection (ICCP) systems for the corrosion protection of internal surfaces of the monopile. The CP design calculations were verified by computational modeling with time dependent simulations for the entire design life. The cathodic protection level, gas production and growth of calcareous deposit was computed for a watertight and open foundation. Long term field monitoring data of the CP system is used to validate the design rules and predictions by the computational models.

Monopile structures represent the majority of offshore wind foundation structures. In the early days, monopiles were designed with watertight platforms to prevent oxygen ingress that may lead to internal corrosion. In practice, some water exchange occurs due to failure of the watertight system. Today monopile foundations with replenishment holes are more common.


This paper discusses the application of impressed current cathodic protection (ICCP) systems for the corrosion protection of internal surfaces of the monopile. The CP design calculations were verified by computational modeling with time dependent simulations for the entire design life. The cathodic protection level, gas production and growth of calcareous deposit was computed for a watertight and open foundation. Long term field monitoring data of the CP system is used to validate the design rules and predictions by the computational models.

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Picture for ICCP System for Internal Protection of Monopiles for Offshore Wind Farms
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51318-11120-ICCP System for Internal Protection of Monopiles for Offshore Wind Farms

Product Number: 51318-11120-SG
Author: Torsten Krebs
Publication Date: 2018
$20.00

A solution to significantly reduce the internal corrosion of internal areas of offshore monopiles using a highly sophisticated ICCP system. Other technical, electrochemical and installation challenges in of such an ICCP system in confined spaces.

 
Picture for Cathodic protection within narrow gaps of offshore wind turbine foundations
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Cathodic protection within narrow gaps of offshore wind turbine foundations

Product Number: 51320-14750-SG
Author: David Buxton, Petra Ernst, Gareth John, Tom Wewer
Publication Date: 2020
$20.00

Cathodic protection (CP) is routinely applied to the external surfaces of offshore wind turbine monopile foundations to minimize corrosion. When the monopile internals are free-flooding, and therefore also exposed to oxygenated seawater, again, cathodic protection may be applied. In cases of unplanned water exchange through cable entry seals, a small additional surface area, in a gap between the seal and the ‘cable entry hole’ through the steel monopile is then exposed to flowing seawater. Cathodic protection calculations were undertaken to assess whether protection (either applied externally or externally and internally) could penetrate into the small gap and prevent corrosion. 
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Accelerated Offshore Coating Performance Testing

Product Number: 51317--9134-SG
ISBN: 9134 2017 CP
Author: Benjamin Chang
Publication Date: 2017
$20.00

Offshore is a very corrosive environment with a high corrosion rate. The offshore coating service life is relatively short and extremely expensive to apply maintenance coatings onsite.  A new accelerated coating corrosion test method is proposed.
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