Correct me if I am wrong but due to Acetylenes propensity to explode when pressurised it used to be dissolved in liquid Acetone in the cylinder. Hence acetylene cylinders should always be used standing up otherwise you get a nasty flamethrower as Acetone has very low vapour point. Definitely stay away from Acetylene cylinders for this purpose. I have seen the results of Acetylene cylinder explosions years ago and it ain't pretty.
Wasn't aware they had asbestos ( as well ? )
But those cylinders would make dang good piers though, hefty steel walls for sure.
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