----- Original Message -----
Sent: Saturday, October
29, 2005 8:39 AM
Subject: Re:
[PSUBS-MAILIST] Propane tanks
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.