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2018-03-18
Stability Assessment of Pipeline Cathodic Protection Potentials Under the Influence of ac Interference
By
Thabane Hendry Shabangu,

    Dr. Thabane Hendry Shabangu

    Department of Electrical Engineering

    Tshwane University of Technology

    South Africa

    Homepage

Purva Shrivastava,

    Dr. Purva Shrivastava

    RADMIC, Department of Telecommunication Engineering

    SRM University

    India

    Homepage

Bolanle Tolulope Abe,

    Dr. Bolanle Tolulope Abe

    Department of Electrical Engineering, Faculty of Engineering and the Built Environment

    Tshwane University of Technology

    South Africa

    Homepage

Peter A. Olubambi

    Dr. Peter A. Olubambi

    Department of Chemical Engineering

    University of Johannesburg

    South Africa

    Homepage

Progress In Electromagnetics Research M, Vol. 66, 19-28, 2018
doi:10.2528/PIERM17112704 | Google Scholar

Abstract
Metallic pipelines are protected from induced corrosion by the application of coating and Cathodic Protection (CP) systems. The latter is achieved by keeping the pipeline at a constant Direct Current (DC) voltage in relation to the surrounding soil. While this is conventionally meant to arrest corrosion, the Alternating Current (AC) interference from high voltage transmission lines has been a major problem to the CP potential systems of buried steel pipelines. Several research studies dealing with this problem have been published, and a lot of research work is still on going. This work focuses on assessing the stability of the CP potentials under the influence of AC interference. Seven different CP potentials varying from -800 mV to -1200 mV were applied on steel pipe specimen exposed to the AC interference with a varying AC voltage from 0-50 V. The results of the laboratory investigation revealed that CP potential of -1150 mV was more stable under the influence of AC interference, with just a minimal shift from the set value. The results from the corrosion morphology tests on the pipelines using Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) reveal the need for optimising the CP potential to provide adequate or optimum protection to the pipelines. Thus, more research studies involving simulation and field studies may lead to a major breakthrough in improving protection potentials.
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Citation
Thabane Hendry Shabangu, Purva Shrivastava, Bolanle Tolulope Abe, and Peter A. Olubambi, "Stability Assessment of Pipeline Cathodic Protection Potentials Under the Influence of ac Interference," Progress In Electromagnetics Research M, Vol. 66, 19-28, 2018.
doi:10.2528/PIERM17112704
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