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07081 POLARISATION MODELLING AS PART OF GALVANIC ANODE UPGRADE OF A HYBRID OFFSHORE CATHODIC PROTECTION SYSTEM

Picture for 07081 POLARISATION MODELLING AS PART OF GALVANIC ANODE UPGRADE OF A HYBRID OFFSHORE CATHODIC PROTECT
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Product Number: 51300-07081-SG
ISBN: 07081 2007 CP
Author: Gareth John, David Buxton, and Ian Cotton
Publication Date: 2007
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This paper describes the development of a computer model to evaluate the performance of replacement galvanic anodes for a 25-year old offshore North Sea platform. The platform had a hybrid cathodic protection system comprising impressed current anodes mounted around the structure as well as aluminum – zinc – indium galvanic anodes. Over a period of time a number of the impressed current anodes had failed which together with natural consumption of the galvanic anodes had started to result in under polarization for sections of the structure. Consequently a cathodic protection upgrade was started, incorporating retrofitting of new galvanic anodes to the structure.
This paper describes the development of a computer model to evaluate the performance of replacement galvanic anodes for a 25-year old offshore North Sea platform. The platform had a hybrid cathodic protection system comprising impressed current anodes mounted around the structure as well as aluminum – zinc – indium galvanic anodes. Over a period of time a number of the impressed current anodes had failed which together with natural consumption of the galvanic anodes had started to result in under polarization for sections of the structure. Consequently a cathodic protection upgrade was started, incorporating retrofitting of new galvanic anodes to the structure.
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