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51318-10723-AC Interference on Cathodically Protected Pipeline From Railway Electrification Systems

A study of alternating current (AC) interference on cathodically protected pipeline from railway electrification systems was conducted with a continuous data logger developed specifically for the purpose.

Product Number: 51318-10723-SG
Author: Joffin George
Publication Date: 2018
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A study of alternating current (AC) interference on cathodically protected pipeline from railway electrification systems was conducted. A continuous data logger capable of measuring the pipe to soil potential at a sampling interval of 1.25s was developed specifically for the purpose. The study was carried out in a 51mm diameter underground pipeline running parallel to the rail line for a distance of nearly 150m. The data logger was placed securely inside a test link post (TLP) with its positive terminal connected to the pipe and the negative terminal to the copper sulfate reference electrode (CSE) buried underground. A maximum of 33 Vrms and a minimum of 5 Vrms were found to be induced in the pipeline when the rail was energized. These measures help us to assess the risk of corrosion and mitigation measures to be implemented, thereby contributing to sustainable corrosion prevention. The present paper presents the scheme of the experimental system, important aspects of the instrumentation part and the major results, along with the author’s plan for future studies.

Keywords: Alternating Current Interference, safety, touch voltage, step voltage, AC mitigation, Cathodic Protection, Data Loggers, right of way (ROW), copper sulfate reference electrode (CSE).

A study of alternating current (AC) interference on cathodically protected pipeline from railway electrification systems was conducted. A continuous data logger capable of measuring the pipe to soil potential at a sampling interval of 1.25s was developed specifically for the purpose. The study was carried out in a 51mm diameter underground pipeline running parallel to the rail line for a distance of nearly 150m. The data logger was placed securely inside a test link post (TLP) with its positive terminal connected to the pipe and the negative terminal to the copper sulfate reference electrode (CSE) buried underground. A maximum of 33 Vrms and a minimum of 5 Vrms were found to be induced in the pipeline when the rail was energized. These measures help us to assess the risk of corrosion and mitigation measures to be implemented, thereby contributing to sustainable corrosion prevention. The present paper presents the scheme of the experimental system, important aspects of the instrumentation part and the major results, along with the author’s plan for future studies.

Keywords: Alternating Current Interference, safety, touch voltage, step voltage, AC mitigation, Cathodic Protection, Data Loggers, right of way (ROW), copper sulfate reference electrode (CSE).

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