Until a few years ago there had been no record of stress corrosion cracking (SCC) as a main cause of failures in Argentine pipelines, but as the pipeline system became a certain age this machanism started to have an important impact on reliability. This study analyzes three blowouts attributed to high pH SCC in different oil and natural gas transmission pipelines, which occurred by the sudden propagation of longitudinal cracks at the outer surface of the pipes. Characteristics of the failure are: colonies of intergranular and branched cracks, a considerable concentration of carbonates and bicarbonates in the soil, a black film covering the fracture surface in the initiation sites, high pipe wall temperature and stresses, low hardness in zhe base material, and electrochemical potential in the range of corrosion protection. The characteristics found on these failures are typical of high pH SCC.
Failures by SCC in buried pipelines
Versagen einer erdverlegten Rohrleitung durch Spannungsrisskorrosion
Engineering Failure Analysis ; 9 , 5 ; 495-509
2002
15 Seiten, 13 Bilder, 3 Tabellen, 7 Quellen
Article (Journal)
English
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