Many pipeline companies ignore the occurrence of external corrosion when cathodic protection (CP) is considered adequate. In these situations, understanding the failure mode of the coating and why CP cannot adequately protect the pipe under certain disbonded coating types is critical.

Paints and coatings manufacturer Sherwin-Williams recently announced top honors in its annual Impact Award program. This year, first place was awarded to a landmark infrastructure upgrade in Fargo, North Dakota, USA, which aims to boost wastewater treatment capacity.

The interiors of large pipelines carrying corrosive liquids may be lined with a suitable coating and protected with a strip-type galvanic anode material. If the pipe interior is bare, relatively large amounts of current may be needed.