What is required of UST systems to avoid corrosion?

Impressed current systems are a method employed to combat corrosion in underground storage tank (UST) systems. Corrosion can be a significant issue for USTs, especially those made of metal, as it can lead to leaks and environmental contamination. Impressed current cathodic protection (ICCP) involves the use of a direct current that is applied to the tank via anodes, which helps to prevent corrosion by providing a protective electrical environment. This method is particularly effective because it actively supplies electrons to the metal structure, thus inhibiting the electrochemical reactions responsible for corrosion.

While other options such as regular cleaning, protection by coating, and secondary containment are also important aspects of UST maintenance and environmental protection, they do not directly address corrosion through an electrochemical method like impressed current systems do. Regular cleaning prevents the buildup of contaminants but does not specifically inhibit corrosion. Coatings provide a barrier against moisture and chemicals but can wear over time. Secondary containment systems are crucial for preventing spills and leaks but do not inherently protect against corrosion of the UST itself. Therefore, the use of impressed current systems stands out as the most targeted and effective strategy for preventing corrosion in USTs.