I have added two flex-pipe gas line extensions to the existing gas piping. Everything is working properly and there are no signs of any leaks while testing for bubbles with soapy water or any smell of gas whatsoever over a week after the installation.
Now, I need to pressure test the new section for inspection. I have a 15psi test gauge which will be attached to one of the new fixtures and I will close the remaining shutoff valves at the end of each flex-pipe extension AND close the shutoff valve that was in the existing black pipe that is just before the split/manifold.
The issue is that there is a pressure regulator between that shutoff valve in the black pipe and all of the end shutoff valves.
Will I damage the pressure regulator, specifically the internal diaphragm, with ~15psi of air pressure?
Will the pressure regulator release any pressure through its vent and prevent the pressure test from succeeding?
Thank you. Eddie