Re: [PSUBS-MAILIST] propane tanks revisited

[Ian Roxborough <irox@ix.netcom.com>]

There's a lot of stuff in the archives about propane tanks, and I seem
to remember that you still have to deoderize a new tank due to some
chemical that is used to treat the inside.

Propane tanks are designed specifically for internal pressure, you are
building something that's specifically designed for external pressure.
(Internal pressure vessels are more forgiving of defects than external
pressure vessels.)

Still, if you're going this route, then a new propane tank is going
to be way better than a used (unknown quality) propane....

Ian.

On Fri, 30 Apr 2004 07:30:00 -0700
"Brian Cox" <ojaibees@ojai.net> wrote:

> Propane Tank investigation:
> 
> I was explaning my design to my diving friend and he mentioned that
> since my pressure hull is around 28" in diameter that I might consider a
> propane tank.  I have always discounted the propane tank idea because I
> felt having to deoderize it wouldn't be worth the effort, but then we
> discussed buying a brand new one -never been used - from the factory.
> I didn't think that would make any difference whether you were buyng a
> new one from the factory or having one rolled from a fabrication
> lant  -  but  -  he pointed out that since the propane tanks are mass
> produced that they are cheaper !  So I called a propane company that I
> know and sure enough they are a lot cheaper .  For a 250 gal  which is
> approx 30" X 7'  the cost was $850.00    compared to $2000.00 (a year
> ago) having it rolled at a fab plant.  I still have to find out the
> exact specs on the propane tank however,  I'm not sure on the thickness
> and I haven't confirmed the grade of steel.
> 
> Brian
>