Originally Posted by NHMaster
But, you naturally, know more than a guy with 36 years experience in the trade and the licenses and certs to back it up.
Good lord, I have no idea why people like you bother even posting on DIY websites. Look, I understand more than you think but I appreciate that you are a 36 year "gas technician" so please explain this to me. You ARE on the website to answer questions right? You keep talking about "working pressure" without being specific. From what I (and several other people here) understand, the working pressure of a residential gas meter is a fraction of a PSI. So testing the system at 10psi should be more than enough. Are you suggesting that it should be tested at around .75psi (about 2.5 times the working pressure at my meter)? I promise, I'm not being sarcastic this time, I actually want to know if you have a good reason it should be tested at a much lower pressure than everyone else thinks.
I've talked to several contractors and plumbers as well as done some more searching on the web and 10psi for about 15 minutes seems to be what is done everywhere. Again, I am not questioning your credentials, but why do you think a pressure test should require a manometer? If it is a very slow leak, I suppose it's hard to tell with a less accurate gauge but mine has been holding pressure for 2 weeks now.
If you are correct and pressure tests should require manometers, than why don't cities or insurance companies require this? Yes, I was being facetious before but I was trying to make the point that most people just install their pipes very tightly, do the soap test and call it good. I am, however, doing a pressure test not just because it's required, but because it's a good idea.
From the California Plumbing Code
1214.1.4 Where new branches are installed from the point of delivery to new appliances, only the newly installed branches shall be required to be pressure-tested.
1214.3.1 Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five
times the test pressure.
1214.3.2 The test pressure to be used shall be no less than 1-1/2 times the proposed maximum working pressure, but not less than 3 psi
1214.3.3 When testing a system having a volume less than 10 cubic feet (0.28 m3) or a system in a single-family dwelling, the test duration shall be a minimum of 10 minutes.
I'd love to add to this with the actual NFGC text but I don't feel like paying $50 to view the pdf.