A 24-in (610-mm) oil pipeline failed due to a longitudinal crack at the 6 o'clock position. The failure was directly related to a poor-quality electric resistance welding process. Incomplete penetration, unmelted zones, and lack of fusion close to the pipe's inner surface were present on an extended length along the seam weld line. This contributed to accelerated grooving corrosion, which led to the failure. Based on the investigation, it seems that the pipe material did not contribute to the failure. Cracks initiated by grooving corrosion originated from weld defect sites, then propagated by inertia at the normal designed pressure condition and stopped when stress relief was attained. The use of high-quality ERW pipe is recommended, with its seam weld line oriented around the 12 o'clock position during installation to minimize grooving corrosion. It is also important to perform regular inspections at suitable intervals, as determined by past experience.
Grooving corrosion of a 24-in seam welded pipeline
Materials Performance ; 53 , 6 ; 62-65
2014
4 Seiten, Bilder, Tabellen, 7 Quellen
Article (Journal)
English
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