Galvanic Corrosion

The most common failure of underground tank systems is galvanic corrosion of the tank or piping. Corrosion can be traced to failure of corrosion protection systems due to pinholes in the coating or taping, depletion of sacrificial anodes, corrosion from the inside due to the stored product, and various other reasons. Many corrosion-related leaks are found in systems that have no corrosion protection at all. However, tanks with corrosion protection can also corrode if the protective coating is damaged during installation; the sacrificial anodes are not replaced when required; the current is switched off in impressed current systems; or the protection system is not designed properly for the soil condition and stored liquids.

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