During a pre-installation test, what is the maximum air pressure for which a steel tank should be subjected?

In the context of a pre-installation test for steel tanks, the maximum air pressure that should be applied is 5 pounds per square inch (psi). This pressure level is established to ensure safety and integrity of the tank without risking damage or structural failure. Testing at higher pressures may lead to deformation or failure of the tank, compromising its effectiveness and safety standards.

The reason why 5 psi is a standard limit relates to both engineering safety practices and the design specifications of typical steel tanks used for underground storage. It allows for adequate testing to identify leaks or weaknesses while maintaining a controlled and safe testing environment. Exceeding this limit can introduce unnecessary risks and is typically against regulatory compliance guidelines, which prioritize the safe operation and longevity of underground storage systems. Adhering to this standard during pre-installation testing is crucial for safe tank operation.