What is the maximum test pressure that should not be exceeded?

The maximum test pressure that should not be exceeded for underground storage tanks (USTs) is typically recommended to be no more than 5 psi. This is due to safety considerations and material integrity during testing. Exceeding this pressure can potentially risk structural damage to the tank or its associated piping systems, leading to leaks or catastrophic failures.

It's important to adhere to this testing pressure to ensure that the integrity of the tank is verified without compromising safety. The use of a lower test pressure helps to minimize stress and potential deformation of the tank material, particularly since many USTs are made from materials that can be sensitive to higher pressures.

The other pressure thresholds, while they may also be specified in certain contexts, do not align with commonly accepted safety practices for routine testing of UST systems. Maintaining a conservative pressure limit is essential to ensure compliance with industry standards and regulations while safeguarding the environment and public safety.