Managed to replicate it, also figured how to fix it. To fix just turn air off then back on.
nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan PRESSURE BUG!
nan nan nan not a number :P Also, I've discovered this bug long ago, and it was a problem in maintaining my "microwave" superlasers; ACEL creates a strange permanent pressure dent when exposed to gases, and it seems to persist even after the ACEL is removed.
lol, i'll look into this when I get home later. I'm not sure what causes it >_>. It also looks like it doesn't happen in my mod.
i have know idea whats happening but cool
sooooooooooooo? WHY IS EVRY BODY TELLING NAN=NOT A NUMBER ................
NAN Means NotANumber at lua.
WOW DOCO! YOU ARE GENIUS :O