For double-wall tanks, pressure monitoring should occur for a minimum of how long?

For double-wall tanks, pressure monitoring for a minimum of 1 hour is essential to effectively assess the integrity of the system. The primary purpose of pressure monitoring is to ensure that any potential leaks or structural failures in the outer wall are detected promptly. A duration of 1 hour provides a sufficient time frame to evaluate any pressure changes that could indicate a breach in the secondary containment, while also considering fluctuations that can occur naturally over time.

This duration balances the need for timely detection with operational feasibility, as longer monitoring periods may not significantly enhance leak detection capabilities but could introduce unnecessary complexities or operational interruptions. The minimum requirement is set to ensure a reliable assessment while accommodating routine operational conditions and potential environmental influences.