SCC (stress corrosion cracking) of the buried pipelines has been ackknowledged a serious problem long ago. The author's researches for a long period of time have established that SCC occurrence in pipe metal is affected by a combination of three factors: Metal quality -availability of structural reasons contributing to occurence and development of original micorcracks; Appropriate level of active stresses (considering inner residual stresses in the structure of metal), exceeding threshold level for occurence and development of mircocracks at rated operating conditions of the pipeline; Availability of corrosive environment saturated with soil microorganisms, its access to the metal surface and interaction of the environment and metal structure. Operating failure mechanism and kinetics were proposed for the buried pipeline -they give insight into, and enable to classify SCC cases as a local biocorrosion process occuring in abnormal, in terms of content, non-metallic spots, and offer to explain, in full, the features of the process that were hard to interpret before.


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    Title :

    New facts in mechanism, development and inspection of stress corrosion vulnerability in gas trunklines


    Additional title:

    Neue Tatsachen zur Anfälligkeit von Spannungsrisskorrosion bei Pipelines


    Contributors:
    Ott, K. (author)


    Publication date :

    2000


    Size :

    9 Seiten, 8 Bilder, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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