In testing regulator shutoff with no appliance demand, which test is used?

In testing regulator shutoff with no appliance demand, which test is used?

• A. Flow test
• B. Pressure test
• C. Lock up test
• D. Leak test

Answer: (C)

The key idea is to verify that the regulator stops gas flow when nothing is drawing gas from the line. The lock-up test is designed to confirm this shutoff action: when there is no appliance demand, the regulator should close fully so no gas passes downstream. Practically, you simulate zero demand by closing the appliance valve and then check that no gas flows past the regulator and that the downstream side holds steady without continuous flow. If gas continues to flow or pressure cannot be held, the regulator’s shutoff isn’t functioning properly and needs service. This test is different from a flow test (which looks at delivery under demand), a pressure test (which checks set pressure under load), or a leak test (which looks for leaks rather than shutoff behavior).

The key idea is to verify that the regulator stops gas flow when nothing is drawing gas from the line. The lock-up test is designed to confirm this shutoff action: when there is no appliance demand, the regulator should close fully so no gas passes downstream. Practically, you simulate zero demand by closing the appliance valve and then check that no gas flows past the regulator and that the downstream side holds steady without continuous flow. If gas continues to flow or pressure cannot be held, the regulator’s shutoff isn’t functioning properly and needs service. This test is different from a flow test (which looks at delivery under demand), a pressure test (which checks set pressure under load), or a leak test (which looks for leaks rather than shutoff behavior).