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98679 COMPUTER MODELING OF PIPELINES AND THEIR CP SYSTEMS FOR IR DROP MEASUREMENT CORRECTION

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Product Number: 51300-98679-SG
ISBN: 98679 1998 CP
Author: F. Dawalibi, R. D. Southey
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This paper demonstrates to what extent the layered structure of the soil influences the IR drop component in pipe-to-soil potentials and how computer modeling of thk soil structure can be used to correct measured potentials. Various types of multilayered soils are compared with uniform soils in terms of their effects on the IR drop produced by nearby anodes, by the leakage current tlom the protected pipeline, and by foreign pipelines. The soil resistivity measurements required to generate such a soil model are described, the interpretation method used to process the measurements is presented, and an example interpretation is illustrated, A simulated set of measurements is presented in detail, along with the IR drop correction made with the software. Full potential mappings are plotted, with and without the IR drop present. Keywords: IR Drop Error, CP Measurement Correction, Computer Modeling, Cathodic Protection Software
This paper demonstrates to what extent the layered structure of the soil influences the IR drop component in pipe-to-soil potentials and how computer modeling of thk soil structure can be used to correct measured potentials. Various types of multilayered soils are compared with uniform soils in terms of their effects on the IR drop produced by nearby anodes, by the leakage current tlom the protected pipeline, and by foreign pipelines. The soil resistivity measurements required to generate such a soil model are described, the interpretation method used to process the measurements is presented, and an example interpretation is illustrated, A simulated set of measurements is presented in detail, along with the IR drop correction made with the software. Full potential mappings are plotted, with and without the IR drop present. Keywords: IR Drop Error, CP Measurement Correction, Computer Modeling, Cathodic Protection Software
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Recent close-interval potential surveys have raised concerns about the accuracy of potential measurements on older, poorly-coated pipelines. Two sources of error were identified: metallic IR-drops and equalization currents.

 
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