I had a natural gas line installed to my kitchen for a gas cook top. The line was connected past the main regulator. After installing the line, the installers ran a pressure check at 10 psi. It held pressure while they were here and through the next several days. Due to labor shortages the county inspector came about a month latter. At this time the gage was reading 0. The inspector said that means there is a leak and failed the inspection. The installer said they will come back and pump up the line and reschedule the inspection. Should the pressure have held for a month? Does this indicate maybe a slow leak? The installer who is a larger local company that did my hvac system, said it was just the time between the inspection and installation.
There should be zero leaks from a gas line. Period.
Any leakage will:
- Increase your gas bill
- Be bad for your health, including:
- Breathing natural gas isn't good for you.
- Having natural gas collect in an area where there could be a spark or open flame tends to lead to things going boom. This is generally considered a Bad Thing™.
It is possible that there is a leak at the pressure gauge, so be sure to test with a 2nd gauge to ensure that wasn't the problem, before tearing everything else apart to redo the whole line.
A collection of the wisdom posted in the comments.