Just curious about this, yesterday I finished my disaster of a NEIPA transfer to (2) 3 gallon kegs ( splitting the batch with my son). I then dry hopped the kegs, purged with co2 a bunch of times, then pressurized to 12 psi.
I checked for leaks with my starsan spray bottle , looked good. So I shut the tank valve off and left the lines and everything else under pressure attached to the kegs.
This morning I looked at the guage and it dropped to about 8 or 9 psi.
I don't know much ( anything) about the physics of the beer absorbing Co2, so would you think this pressure drop is the beer absorbing a bit of the gas, or is it a leak somewhere ? Beer temp is at about 70 for a 5 day dry hop before I cold crash and carb.
I cranked the pressure up to 22 and again checked for leaks but didn't detect any.