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AC Corrosion at Other Frequencies Part B: Laboratory Investigations

Picture for AC Corrosion at Other Frequencies Part B: Laboratory Investigations
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Product Number: 51321-16300-SG
Author: Andreas Junker Olesen/Lars Vendelbo Nielsen/Wolfgang Fieltsch/Fation Shahinas
Publication Date: 2021
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$20.00
$20.00

AC corrosion on cathodically protected pipelines is commonly experienced due to interferencefromhigh voltage transmission lines at afrequency of 50 or 60 Hz. In some cases,the source of interferencemay be low frequency AC transit systems (1/3 of the fundamental frequency) and in other cases higherharmonics of the fundamental frequency canbedetected on pipelines. In part A of this paper a fieldinvestigation of a 120 Hz rectifier ripple, suspected to lead to AC corrosion, is investigated. In this partBof the present investigation, AC corrosion of cathodically protected steel is investigatedusingelectrical resistance (ER) probes at various frequencies and different CP levels in an artificial soilsolution. The effect of frequency on basic aspects and understanding of AC corrosion, specifically interms of alkalization mechanisms and relatedtime constants for involved processes, is discussed.

Keywords:Alternatingcurrent,AC interference, Cathodicprotection,ElectricalResistance Probes, ACcorrosion,AC frequency

 

AC corrosion on cathodically protected pipelines is commonly experienced due to interferencefromhigh voltage transmission lines at afrequency of 50 or 60 Hz. In some cases,the source of interferencemay be low frequency AC transit systems (1/3 of the fundamental frequency) and in other cases higherharmonics of the fundamental frequency canbedetected on pipelines. In part A of this paper a fieldinvestigation of a 120 Hz rectifier ripple, suspected to lead to AC corrosion, is investigated. In this partBof the present investigation, AC corrosion of cathodically protected steel is investigatedusingelectrical resistance (ER) probes at various frequencies and different CP levels in an artificial soilsolution. The effect of frequency on basic aspects and understanding of AC corrosion, specifically interms of alkalization mechanisms and relatedtime constants for involved processes, is discussed.

Keywords:Alternatingcurrent,AC interference, Cathodicprotection,ElectricalResistance Probes, ACcorrosion,AC frequency

 

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The State of the Art in the technical/scientific knowledge of the subject of AC corrosion on cathodically protected pipelines. Its mitigation, the studies and the issue of relevant Standards & Recommendations will also be dealt with.
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