I'm bring Gas to my home so I had to run all new pipe... I'm getting a 450 meter (500,000+ BTU)... I ran calculations for length and size of supply line in black pipe along with length and size of CSST lines (proflex) to gas appliances with BTU load requirements...

After installing, I pressure tested the line.. I ran it up 15 PSI and after 24 hours it was at 14 lbs. Now I know it will pass inspection as my understanding the inspector only requires it hold approx 10 PSI for 15 min which it does all day long...

I've soaked every joint with soapy solution trying to find the source of leak that allowed it to loose 1 PSI over 24 hours and can't find a damn thing... My question is, any ideas how to refine my search or am I just being to picky?

I've never done this before and really could use some advice...

 

Changes in temperature can account for small pressure changes.

 

It might be the temperature, even if it's not you're just being picky. Natural gas is usually supplied at something like .25psi. If you're not getting leaks at 10, you're not going to be loosing gas.

 

Really? I left it at 10 PSI and 36 hours later is at 8.5 PSI... I'll continue to monitor and see if loss of PSI slows / stops completely at lower PSI...

 

There is a reason that the inspector tests as he does. Most of these code things are pretty conservative, I'm sure that if 10psi at 15min wasn't enough to rule out dangerous leaks in the majority of cases, they'd test higher or longer. For example, where I live they test to 5psi for an hour.

 

Be sure and soap the gauge. Common spot for loss.