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07182 Correcting CIPS Surveys for Stray and Telluric Current Interference

Picture for 07182 Correcting CIPS Surveys for Stray and Telluric Current Interference
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Product Number: 51300-07182-SG
ISBN: 07182 2007 CP
Author: J. Peter Nicholson
Publication Date: 2007
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Close interval potential surveys (CIPS) are the backbone of pipeline integrity, because they determine the effectiveness of the cathodic protection system which provides protection against external corrosion. When dynamic stray or telluric currents influence CIPS survey results, accurate interpretation of the results may be difficult if not impossible. Fluctuation of the pipe-tosoil potential due to dynamic stray or telluric current makes it difficult for the corrosion engineer to validate the integrity of the cathodic protection system protecting a valuable asset. This paper will describe a method of recording the effect of stray and telluric currents on the pipe-tosoil potential and utilizing this information to correct the recorded CIPS data.
Close interval potential surveys (CIPS) are the backbone of pipeline integrity, because they determine the effectiveness of the cathodic protection system which provides protection against external corrosion. When dynamic stray or telluric currents influence CIPS survey results, accurate interpretation of the results may be difficult if not impossible. Fluctuation of the pipe-tosoil potential due to dynamic stray or telluric current makes it difficult for the corrosion engineer to validate the integrity of the cathodic protection system protecting a valuable asset. This paper will describe a method of recording the effect of stray and telluric currents on the pipe-tosoil potential and utilizing this information to correct the recorded CIPS data.
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