After the first successful cathodic test, when must the second test be performed?

The requirement for conducting a second cathodic test within 12 to 18 months after the first successful test aligns with established guidelines and regulatory practices for maintaining corrosion protection in underground storage tank systems. This timeframe is important as it ensures that any changes in the environment that could affect the integrity of the cathodic protection system are monitored promptly, allowing for timely corrective actions if needed.

Conducting the second test within this period helps to verify ongoing effectiveness and compliance with safety standards. Regular maintenance and re-evaluation of cathodic protection systems are essential to prevent corrosion, which can lead to leaks and environmental hazards.

The other timeframes mentioned, such as 6-12 months or 24-30 months, either do not align with regulatory requirements for timely follow-up testing or are extended periods that could compromise the integrity of the system. Regular assessments within the specified timeframe are vital for safe operation and compliance with environmental regulations.