U1 UST Installation/Retrofitting Practice Exam 2025 – The Comprehensive All-in-One Guide to Exam Success!

The correct testing pressure for flexible secondary piping is 5 Psig. This testing pressure is significant as it ensures that the secondary piping can effectively contain leaks and prevent any hazardous materials from escaping into the environment. The 5 Psig test is designed to check for integrity and leaks in the system, which is crucial for maintaining safety and compliance with environmental regulations.

Flexible secondary piping is often used in conjunction with underground storage tanks to provide additional protection. By testing at this specific pressure, operators can confidently assess the durability and reliability of the piping system without risking damage that might occur at higher pressures. The values of 10 Psig and 15 Psig are not standard for such applications, as they exceed the safe levels required for flexible materials that might not withstand those pressures without risk of failure. Thus, the testing standard of 5 Psig reflects industry best practices for ensuring the effectiveness and safety of flexible secondary piping.