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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 -----
From: Akins
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 -----
From: Myles Hall
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.