What is the minimum duration of a leak test per 100 feet of piping for large gas piping installations?

What is the minimum duration of a leak test per 100 feet of piping for large gas piping installations?

• A. 0.5 hour
• B. 2 hours
• C. 1 hour
• D. 3 hours

Answer: (C)

Leak tests for large gas piping are designed to give enough time to detect any leaks along the full length of the run. The standard sets a minimum of one hour per 100 feet of piping, so longer installations have longer test times to allow any slow leaks to reveal themselves as a measurable pressure change. This helps ensure the system is truly tight before it’s put into service. Shorter durations could miss gradual leaks, while the requirement is specifically the minimum; you wouldn’t need to extend beyond this minimum unless a higher level of assurance is required.

Leak tests for large gas piping are designed to give enough time to detect any leaks along the full length of the run. The standard sets a minimum of one hour per 100 feet of piping, so longer installations have longer test times to allow any slow leaks to reveal themselves as a measurable pressure change. This helps ensure the system is truly tight before it’s put into service. Shorter durations could miss gradual leaks, while the requirement is specifically the minimum; you wouldn’t need to extend beyond this minimum unless a higher level of assurance is required.