Re: [PSUBS-MAILIST] Propane tanks

[atozed@juno.com]

Hi David,

Here's a "before" picture, I haven't taken any lately.
http://www.psubs.org/psub_pic/ted_pic.html
I've asked psubs to have it not listed as for sale, as it left Canada for
California almost a year ago. I've motored it around on the surface, but
not dived it. Maybe be the end of the year (no offers to bet thanks). 
Brian, don't worry, you're on the short list!

Peter K



On Sun, 30 Oct 2005 10:04:33 -0800 (PST) david cutajar
<davecutajar@djcengineering.com> writes:
> Thats kinda' amazing. Do you have pics of that rig?
> -David
> 
> --- atozed@juno.com wrote:
> 
> > My propane tank sub has been to 300 feet. One
> > thousand gallons, 4 by 10
> > feet, 1/2 in thick cylinder with 5/8 inch end caps.
> > No reinforcing rings.
> > 
> > Peter K.
> > 
> > On Sat, 29 Oct 2005 14:06:40 -0400 "Akins"
> > <lakins1@tampabay.rr.com>
> > writes:
> > Hi Myles.
> > 
> > I would definately consider one for an ambient, but
> > no way for a 1 atm.
> > There was some discussion here a long time ago about
> > 
> > how the tank's holding internal propane pressure did
> > not necessarily
> > cross over to keeping pressure out the same way. I
> > can't recall
> > 
> > what was said though, but I remember it was
> > discussed. Some guys have
> > built them (1 atm) and I have seen some for sale
> > made from propane
> > 
> > tanks. But I'd want a thicker hull for a 1 atm if it
> > was me. I wouldn't
> > trust a propane tank hull, even with reinforcement
> > rings. 
> > 
> > I mean, if you are going to build a 1 atm with all
> > the trouble it
> > takes....you might as well make it where it can go
> > relatively deep and
> > build it with a thick pressure hull
> > 
> > and get down 600 feet or more. Most of the good non
> > picked over wrecks
> > are deeper than scuba depths because the divers have
> > already picked most
> > of them over.
> > 
> > Most wrecks (okay not all) at scuba depths have
> > already been found too
> > and there isn't much to discover new unless you go
> > beyond scuba depths.
> > 
> > But for an ambient? Like I said I think it would be
> > great for that for
> > all the reasons you listed. I think it would be very
> > durable for an
> > ambient and if
> > 
> > you are still contemplating building an ambient,
> > that would be an
> > inexpensive way to go.
> > 
> > Bill.
> > 
> > 
> > 
> > ----- Original Message ----- 
> > From: Myles Hall 
> > To: personal_submersibles@psubs.org 
> > 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 ----- 
> > From: Akins 
> > To: personal_submersibles@psubs.org 
> > 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 
> > To: personal_submersibles@psubs.org 
> > 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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