![]() ![]() It is thought to be most prevalent in high latitudes where there is a marked seasonal change in the carbon dioxide content of the soil. The cracks tend to be wider, with corroded crack walls and filled with corrosion products. In contrast to high pH SCC, the crack propagation through pipe wall thickness is of a transgranular nature. Near-neutral pH SCC cracking typically occurs in association with pits and general corrosion, as it occurs under freely corroding conditions, i.e. ![]() Thus, it is difficult to reliably identify the different cracking types based on inspection data alone.Īs for high pH SCC, the surface cracks generally form colonies in the axial direction of the pipe. The morphology of cracking is highly variable, and there may be many anomalies present in a pipe body and seam weld that would not behave as cracks but create a crack-like indication in crack inspection data. ![]()
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