What is the minimum test pressure of a 0.5 psi gas system?

What is the minimum test pressure of a 0.5 psi gas system?

• A. 2 psi
• B. 3 psi
• C. 4 psi
• D. 5 psi

Answer: (B)

For gas piping, the test pressure must be at least 1.5 times the maximum operating pressure, but not less than 3 psi. Here, the system’s maximum operating pressure is 0.5 psi, so 1.5 times that is 0.75 psi, which is below the required minimum. Therefore, the minimum allowable test pressure is 3 psi. Testing at 2 psi would be below the mandated minimum, while 4 or 5 psi would be higher than the minimum and not needed unless specifically required by the code or design.

For gas piping, the test pressure must be at least 1.5 times the maximum operating pressure, but not less than 3 psi. Here, the system’s maximum operating pressure is 0.5 psi, so 1.5 times that is 0.75 psi, which is below the required minimum. Therefore, the minimum allowable test pressure is 3 psi. Testing at 2 psi would be below the mandated minimum, while 4 or 5 psi would be higher than the minimum and not needed unless specifically required by the code or design.