How long should the pressure be monitored in the pre-installation test of the inner tank of a double-walled tank?

The pre-installation test for the inner tank of a double-walled tank is critical to ensure the structural integrity and leak prevention capabilities of the tank system. Monitoring pressure for a duration of one hour is recommended as it allows sufficient time to accurately assess the tank's performance under pressure. This timeframe helps to detect any potential leaks or weaknesses in the tank's construction that could lead to future failures.

During this hour, operators can observe any pressure drops which could indicate a leak, providing a robust evaluation of the tank's condition before installation. A longer monitoring period ensures that temporary fluctuations do not mislead results, allowing for a more thorough understanding of the tank’s reliability in real-world scenarios where it will need to maintain its integrity under varying conditions. Thus, the one-hour test duration strikes a balance between thoroughness and practicality, making it an important standard in the industry for ensuring safety and compliance with regulations.