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Combined Cathodic and Anodic Interference in Pipeline - An Analysis

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In this paper exhaustive field study trials to monitor the pipe to soil potential over an extended time period and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines.

Product Number: 51317--9004-SG
ISBN: 9004 2017 CP
Author: Rituraj Mishra
Publication Date: 2017
Industries: Cathodic Protection , Pipelines, Tanks, and Underground Systems
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CORROSION 2017 –PAPER NO.A PAPER ON ANALYSIS OF THE COMBINED CATHODIC AND ANODIC CRITICAL INTERFERENCE ON A PIPELINE - DETECTION ANALYSIS AND MITIGATION OF CORROSION RISK Rituraj Mishra (Dy. Manager Maintenanace) PIPELINES (email id mishra2050@gmail.com)BHARAT PETROLEUM CORPORATION LTD (R) MAHUL MUMBAIKeywords: Corrosion Stray Current Mitigation Current Attenuation Test A frame survey Cathodic Interference Anodic Interference Interference BondAbstractInterference can impact the ability to protect a pipeline from corrosion. Common sources are cathodic protection on other lines and DC transit systems .Detecting these stray currents is done by field study trials to monitor the pipe to soil potential over an extended time period. In this paper exhaustive field study and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines. Theanalyzedphenomena arerepresenting the over potential along the foreign pipe under interference when it is at a distance of 3.5 m from the ground-bed. Current enters the pipe close to the ground bed with negative current density and locally protects the pipe .At distant areas this gathered current leaks away with corrosion danger as a logic consequence. Further Current Attenuation test and A frame was carried out to pin point the Anodic area. Once the source and magnitude of the stray currents are found mitigation measure with a possibility to operate the two CP systems separately has been experimented executed and documented with the possible recommendations for mitigating the corrosion risk in such cases without any interference bond.

CORROSION 2017 –PAPER NO.A PAPER ON ANALYSIS OF THE COMBINED CATHODIC AND ANODIC CRITICAL INTERFERENCE ON A PIPELINE - DETECTION ANALYSIS AND MITIGATION OF CORROSION RISK Rituraj Mishra (Dy. Manager Maintenanace) PIPELINES (email id mishra2050@gmail.com)BHARAT PETROLEUM CORPORATION LTD (R) MAHUL MUMBAIKeywords: Corrosion Stray Current Mitigation Current Attenuation Test A frame survey Cathodic Interference Anodic Interference Interference BondAbstractInterference can impact the ability to protect a pipeline from corrosion. Common sources are cathodic protection on other lines and DC transit systems .Detecting these stray currents is done by field study trials to monitor the pipe to soil potential over an extended time period. In this paper exhaustive field study and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines. Theanalyzedphenomena arerepresenting the over potential along the foreign pipe under interference when it is at a distance of 3.5 m from the ground-bed. Current enters the pipe close to the ground bed with negative current density and locally protects the pipe .At distant areas this gathered current leaks away with corrosion danger as a logic consequence. Further Current Attenuation test and A frame was carried out to pin point the Anodic area. Once the source and magnitude of the stray currents are found mitigation measure with a possibility to operate the two CP systems separately has been experimented executed and documented with the possible recommendations for mitigating the corrosion risk in such cases without any interference bond.

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CP Interference and CP Influence and how the two differ. Both will be demonstrated by case histories and some solutions will be presented.
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03710 INTERFERENCE TESTING AND CASE HISTORIES

Product Number: 51300-03710-SG
ISBN: 03710 2003 CP
Author: Jeffrey L. Didas
Publication Date: 2003
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Interference Testing is a task learned through education and experience and is one of the basic skills of Cathodic Protection Personnel. This paper will discuss interference testing and present some case histories, of basic static interference situations and the mitigation methods used.
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