What condition should a tank be in if it is shipped with a liquid filled interstice?

When an underground storage tank (UST) is shipped with a liquid-filled interstice, it indicates that the interstitial space between the inner tank and outer structure is filled with liquid, often for the purpose of leak detection. This condition is essential for understanding how to proceed with installation and testing.

In this specific scenario, the tank should not be subjected to an air or soap test. Air and soap tests are typically used to check for leaks in tanks, but introducing air into a liquid-filled interstice can create pressure that may result in misleading readings or even compromise the integrity of the tank. The liquid inside the interstice serves a critical function in identifying leaks; therefore, applying an air/soap test is inappropriate. Instead, the focus should be on the effectiveness of the liquid in the interstice for leak detection.

This highlights the importance of following established protocols when handling tanks in this condition, ensuring safety and compliance with regulations regarding USTs.