beer gas
this post was submitted on 22 May 2026
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It definitely liquefies under pressures needed to fill these cylinders. I don't have a regulator here, but exit pressures are around 900psi unregulated.
I was using it straight from the bottle unregulated to flush a bunch of iron sediment out of a 300' long loop of 1-1/2 and 2" hot water lines after I rehabbed and put back into service a 70 year old hot water storage tank. The tank had a bunch of tubercule buildup and ended up in the return line, killing pressure.
Incidentally during this visit I fried a 6,000 dollar variable frequency drive for the air handler when I got a slug of water to shoot out of the cut open plumbing about 10' across a room and hose down the unprotected VFD.
Whoops.
I just doublechecked and it's quite interesting. CO2 only liquifies under high pressure in a certain temperature range. Above its critical point at around 31°C it can't be liquified anymore.
The wimdow where it is liquid is much smaller when compared to most other gasses.