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02260 CATHODIC PREVENTION OF NEW SEAWATER CONCRETE STRUCTURES IN PETROCHEMICAL PLANTS

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Product Number: 51300-02260-SG
ISBN: 02260 2002 CP
Author: Zia Chaudhary
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Cathodic prevention systems are now widely recommended for new reinforced concrete structures that are to be exposed to chloride containing environments. However, there are very little published data or design guidelines for such systems. In two new petrochemical plants, reinforced concrete seawater structures were constructed with built in cathodic prevention systems to prevent corrosion of the steel reinforcement from day one. This paper describes the design, installation and commissioning of these CP systems. The anode system consisted of mixed metal oxide coated mesh anode ribbon and titanium conductor bar. The paper will emphasize particularly on the anode design, anode zone configuration and installation practices. The initial performance of these CP systems will be described and discussed. The discussions will focus on different polarization behavior observed in different parts of the structures, i.e. atmospherically exposed, splash or tidal zone, buried and immersed, during the initial performance assessment. Key words: cathodic prevention, concrete, titanium mesh ribbon, reference electrodes, and protection criteria.
Cathodic prevention systems are now widely recommended for new reinforced concrete structures that are to be exposed to chloride containing environments. However, there are very little published data or design guidelines for such systems. In two new petrochemical plants, reinforced concrete seawater structures were constructed with built in cathodic prevention systems to prevent corrosion of the steel reinforcement from day one. This paper describes the design, installation and commissioning of these CP systems. The anode system consisted of mixed metal oxide coated mesh anode ribbon and titanium conductor bar. The paper will emphasize particularly on the anode design, anode zone configuration and installation practices. The initial performance of these CP systems will be described and discussed. The discussions will focus on different polarization behavior observed in different parts of the structures, i.e. atmospherically exposed, splash or tidal zone, buried and immersed, during the initial performance assessment. Key words: cathodic prevention, concrete, titanium mesh ribbon, reference electrodes, and protection criteria.
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A case study of a major CP system operating in Australia for 15 years and proposal of a series of changes to current practices which can be considered for implementation in the design, installation and monitoring stages of new impressed current cathodic protection systems in concrete.

 
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