Effect of flow disturbed condition and MEA inhibitor on corrosion behavior of an API 5L grade A steel

The results of a failure investigation performed on a transportation pipeline for oil products (aromatics - water - DEG) are presented. The damage phenomena of the material were attributed to corrosion - erosion, and secondary to stress corrosion cracking. The analysis aims to identify the mechanisms responsible for service failure of an API 5L grade A pipe after about two years and, also, to mitigate further damage phenomena by a proper identification of the contribution of mechanical, metallurgical and environmental factors (focusing both on technological fluids characteristics and inhibition scheme). Expert report conclusion and other field data give premises for re-designing the maintenance, operating and corrosion-monitoring program in order to avoid future hazards.