For FRP tanks over 12 feet in diameter, what is the maximum air pressure during a pre-installation test?

For fiberglass-reinforced plastic (FRP) tanks that exceed 12 feet in diameter, the standard maximum air pressure during a pre-installation test is set at 3 pounds per square inch (psi). This specific pressure limit is established to ensure the integrity and safety of the tank throughout the testing process.

Pre-installation testing is crucial for identifying any potential leaks or weaknesses in the tank structure before it is put into service. Maintaining a maximum pressure of 3 psi helps to prevent any overstressing of the tank material, allowing for a controlled assessment of its durability without risking damage that could arise from higher pressures. This standard is based on best practices in the industry, ensuring that tanks are both safe for operation and compliant with regulations.

The reason this pressure is critical is because higher pressures could lead to false positives in leak detection or even result in structural failure of the tank during the test. Therefore, adhering to this 3 psi limit is essential for ensuring the long-term functionality and safety of the tank system.