Had LP gas lines installed in new construction build. Everything is capped. At the outside of the house where a regulator will go in the future they installed a pressure gauge and charged the gas lines.
This was done on 9/22, the air temperature that day was 92F and the gauge read 15 PSI. I have checked the gauge a few times and it has been slowly going down. Today the high temperature was 53F and the gauge is reading 9 PSI.
I communicated this to the gas line company today, asking if it should be checked before insulation and drywall go in, and they said the pressure would change as the temperature drops and it is normal.
So the question is what is a normal pressure drop due to temperature change in a statically charged gas line? If pressure fluctuation is normal then how does installing a gauge verify anything one way or the other? What basis do I use to either insist on further inspection or take their word for it?