For double wall tanks, pressure should be monitored for how many hours?

In the context of double wall underground storage tanks (USTs), the recommended monitoring period for pressure is typically one hour. This one-hour timeframe is important for ensuring that any potential leaks or failures in the primary or secondary containment can be detected promptly.

Monitoring pressure for this short duration helps to establish that the integrity of the tank is maintained and that the containment systems are functioning correctly. If there are any issues, such as a drop in pressure, they can be identified quickly, which is crucial for preventing environmental contamination and ensuring compliance with regulatory requirements.

By focusing monitoring efforts over this one-hour period, operators can ensure adequate safety measures while adhering to industry standards for double wall tank installations. Extending the pressure monitoring period beyond one hour is generally not a common practice and may not provide additional benefits, thus reinforcing the appropriateness of the one-hour monitoring requirement.