Which is the correct test for gas distribution up to 1/2 psi?

Which is the correct test for gas distribution up to 1/2 psi?

• A. 3 psi for 30 minutes
• B. 60 minutes
• C. 15 minutes
• D. No less than 90 psi

Answer: (A)

For gas distribution systems operating at 1/2 psi or less, the test uses a pressure of 3 psi held for 30 minutes. This choice provides a safe margin above the maximum operating pressure to reveal leaks, while staying within the strength limits of typical piping and fittings. The 30-minute duration helps ensure that any slow leaks become detectable. The other options don’t fit this scenario: a longer duration isn’t required, a shorter duration may miss leaks, and a test pressure of 90 psi is far too high for low-pressure distribution and could damage the system.

For gas distribution systems operating at 1/2 psi or less, the test uses a pressure of 3 psi held for 30 minutes. This choice provides a safe margin above the maximum operating pressure to reveal leaks, while staying within the strength limits of typical piping and fittings. The 30-minute duration helps ensure that any slow leaks become detectable. The other options don’t fit this scenario: a longer duration isn’t required, a shorter duration may miss leaks, and a test pressure of 90 psi is far too high for low-pressure distribution and could damage the system.