Trevor Jones writes:

By the time the CO2 has travelled through the reg and hoses, (where
the reg limits pressure to 100 psi or so) you can be pretty sure that
liquid CO2 is not an issue.

It will certainly spit CO2 liquid eventually if heat is not supplied to
make up the heat of vaporization.

Hoses would blow if the liquid got that far.

Let's hope so, rather than some metal tool.

Is there some other type of overpressure relief on the low side of the
regulator? Because if the regulator fails open, you're gonna get 1000 psi
into your hoses.