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Hi Myles.
There have been some subs made from propane tanks
but most of the knowledgeable subbers shun them.
Because...
1. They can explode from residual propane when you
grind cut or torch them.
2. They are of an unknown metalic
strength.
3. They are usually too thin for deep
dives.
4. The interior of an empty one may be corroded if
the valve was left open and hence you have something useless when you cut it
open.
There are some other reasons I have heard of too,
but that's all that comes to mind right now.
If you do use a propane tank I have always heard to
make sure you buy a brand new one that is shipped to you without any gas ever
having
been put into it. Then it is safe to grind cut or
torch.
I wouldn't use one for a pressure hull myself, but
I think they might be good for an ambient.
Bill.
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