[leftcoast]

I'm testing a gas piping system @30 psi and lost a pound or so after 24 hours. My debate with a coworker is expansion and contraction,can ambiant temperatures or compressed air temperatures when it was filled cause my pressure drop? I think so, what do you think? Thanks

[ma0641]

Really depends on the volume that can expand or contract. In a small pipe, very short, 1# would be a lot. In a large pipe with a lot of air, 1 pound seems reasonable. However, what happened after another 24 hours?

[leftcoast]

Thanks for the feedback... about 50'of 2" and 50' of 1". I'll see tomorrow about anymore drop.

[speedball1]

When the pipe was pressured up did you paint every joint with a detergent solution and check for bubbles. Just how did you check for leaks? Back to you, Tom

[hkstroud]

Tom,
Aren't gas lines normally tested at a much lower pressure, say around 5 to 10 pounds? Making a change more visible on the gauge and making temperature changes less of a factor.

[speedball1]

I would think so Harold but I'm trying to find out how they tested for leaks. I just figured they upped the pressure for a more positive test. Regards, Tom