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Concerns Over Utilizing Aluminium Anodes in Sealed Environments

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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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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