For piping operating greater than 10 psig up to 70 psig, what test pressure is required?

For piping operating greater than 10 psig up to 70 psig, what test pressure is required?

• A. 100 psig
• B. 70 psig
• C. 50 psig
• D. 25 psig

Answer: (A)

Testing pressure is chosen so leaks show without over-stressing system components. For gas piping, the rule is to apply a test pressure about 1.5 times the maximum operating pressure, but not to exceed a practical maximum rating of 100 psig. When the system could operate up to 70 psig, 1.5 times would be 105 psig, but the cap means you test at 100 psig. This keeps the test strong enough to reveal leaks while staying within what the equipment and materials are rated to handle.

Testing pressure is chosen so leaks show without over-stressing system components. For gas piping, the rule is to apply a test pressure about 1.5 times the maximum operating pressure, but not to exceed a practical maximum rating of 100 psig. When the system could operate up to 70 psig, 1.5 times would be 105 psig, but the cap means you test at 100 psig. This keeps the test strong enough to reveal leaks while staying within what the equipment and materials are rated to handle.