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Benefits of continuous corrosion monitoring for offshore wind structures

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Back in 1991 the first offshore wind asset was constructed in Denmark near the coastline from Vindeby (which means windy city). This asset comprised 11 foundations with a capacity of 0.36 MW each. Since then; the offshore wind industry has been booming, and projects are becoming bigger and bigger in size (capacity), number of foundations per site and further and further offshore.

Product Number: 51323-19288-SG
Author: Birit Buhr, Lars Peter Løvendahl Raun, Ruth E. Sørensen, Yaser Rezania, Annika Martina Diederichs
Publication Date: 2023
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$20.00
$20.00

Offshore wind is a booming industry, with larger and larger structures, increasing in number of structures per site and placed further and further offshore. This makes operation and maintenance difficult and costly.

Corrosion is one of the key drivers defining the structure lifetime in offshore wind. Therefore, a corrosion protection strategy combining cathodic protection, coating and corrosion allowance is developed individually for each site providing the best possible corrosion protection in the marine environment to achieve the anticipated service life with the aim of avoiding any replacement or maintenance and repairs in inaccessible areas.

The cathodic protection system for offshore wind foundations is designed according to standards, for instance ISO 24656 “Cathodic protection of offshore wind structures”. The continuous corrosion protection of the foundation is to be documented to confirm design assumptions and continued integrity of the foundation structure.

This paper outlines background and rationale for adapting a corrosion protection strategy with among others ER sensors as well as provide results from application of ER sensors in offshore wind foundations for wind turbine generators jointly with how these monitoring systems can be implemented in the operation and maintenance phase.

Offshore wind is a booming industry, with larger and larger structures, increasing in number of structures per site and placed further and further offshore. This makes operation and maintenance difficult and costly.

Corrosion is one of the key drivers defining the structure lifetime in offshore wind. Therefore, a corrosion protection strategy combining cathodic protection, coating and corrosion allowance is developed individually for each site providing the best possible corrosion protection in the marine environment to achieve the anticipated service life with the aim of avoiding any replacement or maintenance and repairs in inaccessible areas.

The cathodic protection system for offshore wind foundations is designed according to standards, for instance ISO 24656 “Cathodic protection of offshore wind structures”. The continuous corrosion protection of the foundation is to be documented to confirm design assumptions and continued integrity of the foundation structure.

This paper outlines background and rationale for adapting a corrosion protection strategy with among others ER sensors as well as provide results from application of ER sensors in offshore wind foundations for wind turbine generators jointly with how these monitoring systems can be implemented in the operation and maintenance phase.

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