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Bill.
Yes, agreed. When I was looking
into the feasibility of a propane tank pressure hull, I was certainly only
thinking of a new one. There is no way in hell I would put my torch to a
used one. The reason I was considering one as a possibility is
because:
1) I'm not looking to go very
deep.
2) They are, by their very nature, pressure
vessels complete with hemi-spherical end caps.
3) Cost. Being mass produced, you would
expect them to be relatively cheaper than a scratch build.
4) Availability.
5) Convenience of having a pressure hull with
end caps already.
Having said all that, if I'm taking the time to
cut, grind, and weld, I was just as soon scratch build a hull that is a little
more durable.
I don't know, it was something I was pondering but
I'm leaning towards a scratch build.
Myles.
----- Original Message -----
Sent: Saturday, October 29, 2005 2:29
AM
Subject: Re: [PSUBS-MAILIST] Propane
tanks
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.
----- Original Message -----
Sent: Friday, October 28, 2005 8:20
PM
Subject: Re: [PSUBS-MAILIST] remove me
second kind request
Patrick,
Speaking of propane tanks for
pressure hulls, is there any merrit to that, convenience or expense wise, or
is a guy just as smart to scratch build the hull ?
Have you done any research on the
propane tank thing ?
Myles.
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