Based on field experiments conducted over a period of four years in six operating fields, it was found that: Pitting corrosion rates were similar when the compositions of surface layers were similar. When a compact layer of a single species formed, the surface was protected from pitting corrosion; the FeS layer was more protective than the FeCO3 layer. When multiple layers of several species formed, the susceptibility of the surface to pitting corrosion increased. Frequent changes in the pipeline operating conditions facilitated formation of multiple layers. When no surface layer formed, the susceptibility of the surface to pitting corrosion decreased but was not eliminated. Extraneous materials (e.g., sand) on the surface facilitated pitting corrosion. In the absence of surface layer and extraneous materials, no pitting corrosion was observed.


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    Title :

    Effect of field operational variables on internal pitting corrosion of oil and gas pipelines


    Additional title:

    Einfluss der Betriebsvariablen auf die Lochkorrosion im Inneren von Öl- und Gaspipelines


    Contributors:
    Demoz, A. (author) / Papavinasam, S. (author) / Omotoso, O. (author) / Michaelian, K. (author) / Revie, R.W. (author)

    Published in:

    Corrosion, Houston ; 65 , 11 ; 741-747


    Publication date :

    2009


    Size :

    7 Seiten, 3 Bilder, 7 Tabellen, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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