When should final tightness testing on the piping be conducted?

Final tightness testing on the piping should be conducted after paving and before the system becomes operational. This timing is crucial because it ensures that any potential leaks or issues are identified and addressed prior to the fuel system being put into use, which is essential for maintaining environmental safety and compliance with regulations.

Conducting the test after paving allows for an assessment of the entire system, ensuring that everything is secure and intact after installation, and that any disturbances to the environment or the installation site do not lead to leaks. This proactive approach helps to protect groundwater and soil from contamination, reducing the risk of costly spills or environmental harm.

Testing before the system is operational also aligns with regulatory requirements that seek to minimize risks associated with underground storage tanks and their piping systems. It is part of a diligent approach to ensuring the integrity and safety of UST installations.