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51316-7702-Monitoring and Inspection Options for Evaluating Corrosion in Offshore Wind Foundations

Picture for Monitoring and Inspection Options for Evaluating Corrosion in Offshore Wind Foundations
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Product Number: 51316-7702-SG
ISBN: 7702 2016 CP
Author: Troels Mathiesen
Publication Date: 2016
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$20.00
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The design of offshore wind foundations is still evolving as large projects are being commissioning or planned for the northern part of Europe. Monopile foundations represent the most common design but other structure types are also being installed such as jackets tripods and gravity foundations. In comparison with offshore structures for oil and gas production wind foundations present some new challenges for corrosion protection. As the structures are unmanned the requirements to operation and maintenance must be kept at a minimum. At the same time the huge water volume in the closed compartment of monopiles raises some concerns about MIC at seabed. The cathodic protection being applied both outside and inside also involves certain challenges. In this respect several new approaches for inspection and corrosion monitoring have been applied. The paper reviews specific corrosion risks such as macro galvanic elements MIC and insufficient CP. Experiences from evaluating such issues by using various inspection and monitoring techniques are discussed. The applied techniques include UT examination CP surveys with drop cells and environmental depth profiling. Corrosion has been evaluated using both small coupons and full-length coupons while real-time measurements have included ER sensors as well as potential and current measurement.
The design of offshore wind foundations is still evolving as large projects are being commissioning or planned for the northern part of Europe. Monopile foundations represent the most common design but other structure types are also being installed such as jackets tripods and gravity foundations. In comparison with offshore structures for oil and gas production wind foundations present some new challenges for corrosion protection. As the structures are unmanned the requirements to operation and maintenance must be kept at a minimum. At the same time the huge water volume in the closed compartment of monopiles raises some concerns about MIC at seabed. The cathodic protection being applied both outside and inside also involves certain challenges. In this respect several new approaches for inspection and corrosion monitoring have been applied. The paper reviews specific corrosion risks such as macro galvanic elements MIC and insufficient CP. Experiences from evaluating such issues by using various inspection and monitoring techniques are discussed. The applied techniques include UT examination CP surveys with drop cells and environmental depth profiling. Corrosion has been evaluated using both small coupons and full-length coupons while real-time measurements have included ER sensors as well as potential and current measurement.
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