On 7 Oct, 18:32, Dave wrote:

Whilst hardly safe, diabatic generation of CO2 gas from a cylinder
full of liquid isn't in the same league as knocking the end of an
oxygen cylinder.

Have you seen that happen and what was it like from a mile away?

Just fully-opening the valve on an unsecured oxygen cylinder lying on
the ground is exciting enough in the rocketry stakes.

Only oxygen cylinders I've seen explode were probably over-shadowed by
the acetylene, and it was indeed a mile or two away.

CO2, through a large dump valve (emptying a cylinder in seconds) tends
to be more messy than anything. It makes a vast pile of dry-ice snow,
as there just isn't the heat available to vapourise the gas.