One of the major issues in the pipeline industry is coating disbondment. A very large percentage of the external corrosion and stress corrosion cracking (SCC) has been and continues to be observed under disbonded coatings that shield Cathodic Protection (CP). The various coating types and their typical failure modes under various environmental conditions as well as their compatibility with CP when disbondment occurs play a major role in selection criteria for coating and re-coating programs. With the continued development and improvements of the "Electro-Magnetic Acoustic Transducer" (EMAT) technology to locate and size disbonded coatings without the need of exposing the pipeline, gives operators economically sound information about their pipeline systems. The "EMAT" technology is also capable of identifying the various coating types. Correlating the EMAT coating information with CP readings enables pipeline operators to distinguish between CP shielding disbonded coatings and coating defects that result in "CP open" coating holidays or coatings that are non-shielding when disbondments have occurred. A combination of EMAT coating information with environmental data (e.g. climate, soil types and wet/dry cycles) and various CP survey data will allow for a better selection and use of coatings. This information will be critical to the development of new coating products to effectively mitigate the development of SCC and external corrosion when disbondments occur. This set of information constitutes an excellent basis for coating types to be used for coating rehabilitation programs, SCC susceptibility models and Pipeline Integrity Management Systems (PIMS). This paper outlines different coating failure scenarios and gives examples of selection criteria for adequate coating repairs. It describes the drivers for the coating type selection and how the EMAT in line inspection results can support the decision process.


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    Title :

    EMAT, pipe coatings, corrosion control and cathodic protection shielding


    Additional title:

    Elektrodynamische Prüftechnik, Rohrbeschichtung, Korrosionsschutz und Kathodenschutzabschirmung


    Contributors:


    Publication date :

    2013


    Size :

    14 Seiten, 13 Bilder, 20 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English