Mathematical models were developed to predict cathodic protection (CP) requirements for coated pipelines protected by parallel anodes. This work was motivated by the need to estimate current and potential distribution on a pipe when anodes are placed nearby or when discrete coating holidays exposed bare steel. The conventional anode resistance formulas that were developed for bare pipes protected by remote anodes cannot be used to describe the current and potential distribution on a pipeline with coating holidays or with anodes placed in close proximity to the pipe. The need to consider the current and potential distribution at the pipe when designing a CP system with anodes close to the pipe requires that holidays be modeled in a realistic way. The 2-D and 3-D boundary element mathematical models presented here provide the flexibility to model the performance of CP designs for a variety of parallel anode configurations. A unique feature of these models is the ability to perform calculations on a CP. The model offers a convenient tool to quantify the performance of a CP system and allows the user to determine the influence of relevant parameters (e.g. soil resistivity, coating damage, and anode type and spacing). The model also can be used as an educationak tool to identify factors that control CP performance in different operating conditions.


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    Title :

    Mathematical models for cathodic protection of an underground pipeline with coating holidays: Part 1 - Theoretical development


    Additional title:

    Mathematische Modelle für den kathodischen Schutz von unterirdischen Rohrleitungen mit fehlerhafter Beschichtung. Teil 1 - Theoretische Entwicklung


    Contributors:

    Published in:

    Corrosion, Houston ; 53 , 4 ; 264-272


    Publication date :

    1997


    Size :

    9 Seiten, 8 Bilder, 1 Tabelle, 31 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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