Storage tanks are the primary means for storing large volumes of liquids and gaseous products. Metal
loss from internal and external corrosion can reduce the service life of a tank. It is important to maintain
the integrity of steel storage tanks for safety, economic, and environmental reasons.
Saudi Aramco implemented three different scenarios of cathodic protection (CP) during bottom plate
replacement for three typical tanks. The tanks’ bottom plates were replaced based on thickness
measurements and visual inspection that revealed severe corrosion from soil. The main reason for
such corrosion was due to the asphalt layer underneath the tank. It was considered during the
replacement of the bottom plate to provide a reliable external (CP) and leak detection system. The
purpose of this paper is to demonstrate the experience gained from executing CP upgrades, and to
provide the best option to ensure integrity, cost saving and fewer shutdown periods.