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PRCI PR-262-0114
- Evaluation & Comparison of Soil Resistivity Measurement Techniques
- Report / Survey by Pipeline Research Council International, 07/01/2004
- Publisher: PRCI
$98.00$195.00
L52127e
Correng
Need: The measurement and interpretation of soil resistivity data is a fundamental aspect of pipeline corrosion engineering; nevertheless, very little information has been specifically published to assist pipeline corrosion personnel with these tasks.
Result: The purpose of this project was to evaluate the various techniques and instruments which are available for the measurement of soil resistivity, and also to consider the methods which are available to interpret the data. Although large amounts of information have already been published on this subject in other fields of engineering, much of this literature is not applicable to pipeline corrosion applications. A test method which might be considered a standard practice in one field of engineering may not be applicable to pipeline corrosion engineering at all, and so it was important that this evaluation be conducted by a pipeline corrosion engineer on behalf of all pipeline corrosion engineers. It was anticipated that this report might serve as a soil resistivity reference for the pipeline and corrosion industries, and possibly for electrical engineers in general, who are interested in the investigation of the earth's electrical characteristics.
Benefit: An evaluation was conducted of the various techniques and instruments which are available to collect soil resistivity data, and which are applicable to such pipeline corrosion applications as ground electrode design for cathodic protection and AC mitigation systems, soil corrosivity analysis, and AC corrosion risk analysis. Apparent resistivity formulae are derived for most of the common galvanic (four-pin) methods, and this derivation method can be applied to any arbitrary arrangement of four electrodes in order to determine the appropriate resistivity formula. The depth of investigation of a resistivity sounding technique is found to be an often misunderstood and misused concept. The relative depths of investigation for various galvanic and electromagnetic methods are discussed and compared.
Correng
Need: The measurement and interpretation of soil resistivity data is a fundamental aspect of pipeline corrosion engineering; nevertheless, very little information has been specifically published to assist pipeline corrosion personnel with these tasks.
Result: The purpose of this project was to evaluate the various techniques and instruments which are available for the measurement of soil resistivity, and also to consider the methods which are available to interpret the data. Although large amounts of information have already been published on this subject in other fields of engineering, much of this literature is not applicable to pipeline corrosion applications. A test method which might be considered a standard practice in one field of engineering may not be applicable to pipeline corrosion engineering at all, and so it was important that this evaluation be conducted by a pipeline corrosion engineer on behalf of all pipeline corrosion engineers. It was anticipated that this report might serve as a soil resistivity reference for the pipeline and corrosion industries, and possibly for electrical engineers in general, who are interested in the investigation of the earth's electrical characteristics.
Benefit: An evaluation was conducted of the various techniques and instruments which are available to collect soil resistivity data, and which are applicable to such pipeline corrosion applications as ground electrode design for cathodic protection and AC mitigation systems, soil corrosivity analysis, and AC corrosion risk analysis. Apparent resistivity formulae are derived for most of the common galvanic (four-pin) methods, and this derivation method can be applied to any arbitrary arrangement of four electrodes in order to determine the appropriate resistivity formula. The depth of investigation of a resistivity sounding technique is found to be an often misunderstood and misused concept. The relative depths of investigation for various galvanic and electromagnetic methods are discussed and compared.
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