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.
Effect of field operational variables on internal pitting corrosion of oil and gas pipelines
Einfluss der Betriebsvariablen auf die Lochkorrosion im Inneren von Öl- und Gaspipelines
Corrosion, Houston ; 65 , 11 ; 741-747
2009
7 Seiten, 3 Bilder, 7 Tabellen, 12 Quellen
Article (Journal)
English
Corrosion modeling - 1. Model predicts internal pitting corrosion of oil, gas pipelines
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