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51316-7853-Limits of the ON-OFF Technique for the Assessment of Cathodic Protection of Buried Pipeline

Picture for Limits of the ON-OFF Technique for the Assessment of Cathodic Protection of Buried Pipeline
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Product Number: 51316-7853-SG
ISBN: 7853 2016 CP
Author: Marco Ormellese
Publication Date: 2016
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The general criterion used to verify the cathodic protection (CP) condition of a structure is based on structure-to-electrolyte potential measurement in compliance with the protection criteria provided by international standards. Among the available techniques to eliminate the ohmic drop contribution in the potential readings on-off technique is typically used when local fixed reference electrode or potential probes are not installed. Laboratory tests were carried out in soil-simulating solution on carbon steel specimens in CP condition in order to evaluate the effectiveness of off-potential technique for the assessment of CP condition. Quasi-immunity and overprotection conditions were considered. The limitations of the off-potential technique are discussed; the technique is not reliable in overprotection condition in the presence of equalising currents or under DC interference. A guidance to the interpretation of off-potential measurements is provided
The general criterion used to verify the cathodic protection (CP) condition of a structure is based on structure-to-electrolyte potential measurement in compliance with the protection criteria provided by international standards. Among the available techniques to eliminate the ohmic drop contribution in the potential readings on-off technique is typically used when local fixed reference electrode or potential probes are not installed. Laboratory tests were carried out in soil-simulating solution on carbon steel specimens in CP condition in order to evaluate the effectiveness of off-potential technique for the assessment of CP condition. Quasi-immunity and overprotection conditions were considered. The limitations of the off-potential technique are discussed; the technique is not reliable in overprotection condition in the presence of equalising currents or under DC interference. A guidance to the interpretation of off-potential measurements is provided
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Picture for Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?
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Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?

Product Number: 51317--9353-SG
ISBN: 9353 2017 CP
Author: Marco Ormellese
Publication Date: 2017
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In this paper, a preliminary study of the effect of intermittent CP has been carried out in order to investigate the effect of a temporary current interruption on the potential monitoring and on the residual corrosion of the metal.

 
Picture for 02111 NEW CP CRITERIA FOR ELIMINATION OF...
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02111 NEW CP CRITERIA FOR ELIMINATION OF THE RISKS OF AC CORROSION AND OVERPROTECTION ON CATHODICALLY PROTECTED PIPELINES

Product Number: 51300-02111-SG
ISBN: 02111 2002 CP
Author: Yuji Hosokawa, Fumio Kajiyama, and Yasuo Nakamura
Publication Date: 2002
$20.00

New cathodic protection (CP) criteria were developed based on AC and DC current densities measured using coupons. Using these criteria, the design of CP systems for newly constructed pipelines, paralleling high voltage AC power lines, and  DC rail transit systems, was successfully performed.
Picture for Improvement to Cathodic Protection Performance using DCVG Prioritization
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51316-7091-Improvement to Cathodic Protection Performance using DCVG Prioritization

Product Number: 51316-7091-SG
ISBN: 7091 2016 CP
Author: Chukwuma Onuoha
Publication Date: 2016
$20.00

This paper will show improvements in interpretation of direct current voltage gradient % IR and how accurate selection of pipeline coating rehabilitation location based on this concept would lead to improvements in cathodic protection performance. Case studies from previous external corrosion direct assessment digs will be presented.
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