STP1056

    Measurements of IR-Drop Free Pipe-to-Soil Potentials on Buried Pipelines

    Published: Jan 1990


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    Abstract

    The purpose of this paper is to examine current interruption methods of estimating the level of polarization (off-potential) on a buried pipeline and to indicate some of the specific problems associated with field measurements. Data are reviewed that indicate the magnitude of the voltage (IR-drop) errors associated with potential measurements on buried pipelines. Oscilloscope tracings of pipe-to-soil potential waveforms are presented and a “spiking” condition is discussed which can significantly affect the ability to make an off-potential measurement at the instant of interruption. Stray currents and long-line currents, which can affect the ability to measure the level of polarization on an operating pipeline, are discussed. Methods of detecting stray currents and long-line currents are briefly presented.

    Keywords:

    cathodic protection, off-potential, current interruption, voltage error, IR-drop, IR error, pipe-to-soil potential, voltage waveforms, oscilloscope, pipelines, buried pipe, steel, soil, long-line current, stray current, potential spike


    Author Information:

    Thompson, NG
    President and vice-president, Cortest Columbus, Inc., Columbus, OH

    Beavers, JA
    President and vice-president, Cortest Columbus, Inc., Columbus, OH


    Paper ID: STP25287S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP25287S


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