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Concerns Over Utilizing Aluminium Anodes in Sealed Environments

Picture for Concerns Over Utilizing Aluminium Anodes in Sealed Environments
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Seawater pH inside an offshore wind turbine monopole had changed from pH 8 to less than pH 5. And toxic gas alarms were energised. This paper discusses a theory why the pHdropped and solutions to overcome the low pH with the use of aluminium anodes.

Product Number: 51317--8956-SG
ISBN: 8956 2017 CP
Author: Alex Delwiche
Publication Date: 2017
Industries: Maritime , Energy Generation
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$20.00
$20.00

In 2012a cathodicprotection trial was undertaken to establish the current requirements to protect the submerged internal section of monopiled windturbine structures. Aluminium anodes were utilized and a monitoring system was installed to measure the anode current potential of the structure but also to measure hydrogen which wasthe projects mainconcern when installing anodes in an enclosed environment.Through the course of the trailwithin a few weeks the seawater pH inside the monopile had shifted from neutral pH7.5 to less than pH5. pH of these values hadnever been found or reported before when using aluminium alloy anodes. This paper discusses a theory why the pHdropped and solutions to overcome the low pH with the use of aluminium anodes.

Key words: Monopiles, Aluminium, Anodes, Hydrogen Sulphide, pH

In 2012a cathodicprotection trial was undertaken to establish the current requirements to protect the submerged internal section of monopiled windturbine structures. Aluminium anodes were utilized and a monitoring system was installed to measure the anode current potential of the structure but also to measure hydrogen which wasthe projects mainconcern when installing anodes in an enclosed environment.Through the course of the trailwithin a few weeks the seawater pH inside the monopile had shifted from neutral pH7.5 to less than pH5. pH of these values hadnever been found or reported before when using aluminium alloy anodes. This paper discusses a theory why the pHdropped and solutions to overcome the low pH with the use of aluminium anodes.

Key words: Monopiles, Aluminium, Anodes, Hydrogen Sulphide, pH

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Retrofit Strategy Using Aluminium Anodes for the Internal Sections of Windturbine Monopiles

Product Number: 51317--8955-SG
ISBN: 8955 2017 CP
Author: Alex Delwiche
Publication Date: 2017
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This paper discusses the corrosion mitigation strategy for protecting the submerged sections of a monopile wind turbine structure off the east coast of England in UK waters.

 
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51318-10494- The Water pH and Gas Evolution Risks Associated with the Use of Aluminium and Zinc Anodes for the Internal Cathodic Protection of Offshore Monopiles

Product Number: 51318-10494-SG
Author: Alex Delwiche / Patrick Lydon
Publication Date: 2018
$20.00

Within a few weeks in a 2012 cathodic protection (CP) trial for monopiled windturbine structures in the North Sea, the seawater pH inside the monopile dropped from 8 to 5 and toxic gas (H2S and CO) alarms were energised. This paper explains why.
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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
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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.

 
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