ICC Underground Storage Tank (UST) Installation and Retrofitting Certification Exam – Complete Practice Guide for Success! 2026

For flexible secondary piping, the test pressure requirement is set at 5 Psig. This specification is designed to ensure that the flexible secondary containment systems are robust enough to detect leaks and maintain integrity without causing excessive stress or damage to the piping materials. Testing at this pressure allows for verifying that the system can withstand operational conditions while also ensuring safety measures are in place.

Testing secondary piping at this pressure supports regulatory compliance and industry standards, as flexible secondary systems are critical for containing potential leaks from primary piping. Maintaining a lower pressure testing limit helps prevent over-pressurization that could lead to failure, and it aligns with best practices for ensuring long-term durability and effectiveness of the secondary containment system.