General Question
I have about 150 total feet of newly installed black iron gas pipe w/ various joints and tee's. Mostly 1" line w/ 1/2" branches. Nothing is attached to any appliances or devices of any kind. In pressure test stage, so is not energized with gas yet. The system is currently isolated from the existing, energized system at one end by a ball valve and then to the various branches with ball valves and caps.
My question is that during pressure testing I was chasing a VERY small leak. Required pressurizing to about 90 psi to be able to finally find it. Now, to be safe, I have pressurized again to 90 psi and it is holding well but over multiple days it does bleed down a little (After a week it is down to about 30 PSI).
Is there any level of expected bleed on an effectively closed system like this? Should I consider the gauge or the schrader valve as possible sources (they are not expressing any signs of leakage when using leak check). Any other thoughts?
I have about 150 total feet of newly installed black iron gas pipe w/ various joints and tee's. Mostly 1" line w/ 1/2" branches. Nothing is attached to any appliances or devices of any kind. In pressure test stage, so is not energized with gas yet. The system is currently isolated from the existing, energized system at one end by a ball valve and then to the various branches with ball valves and caps.
My question is that during pressure testing I was chasing a VERY small leak. Required pressurizing to about 90 psi to be able to finally find it. Now, to be safe, I have pressurized again to 90 psi and it is holding well but over multiple days it does bleed down a little (After a week it is down to about 30 PSI).
Is there any level of expected bleed on an effectively closed system like this? Should I consider the gauge or the schrader valve as possible sources (they are not expressing any signs of leakage when using leak check). Any other thoughts?