Re: [PSUBS-MAILIST] O2

["Herve" <caribsub@coqui.net>]

I get my oxygen for my rebreathers at the local dive shop, i dont know if it
s medical or aviation, though no prescription at all.
Dive shops use O2 on a regular basis to refill nitrox and rebs
Herve
----- Original Message -----
From: "David Deffner" <deffner@glade.net>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, May 07, 2002 12:02 PM
Subject: Re: [PSUBS-MAILIST] O2


> Being a pilot, and presently building a plane, I believe the only real
> difference with aviation grade, other than what Paul has already stated,
is
> that it has a lower moisture content.  Don't want to get way up there in
> really freezing conditions and have an oxygen line freeze.  I'll ck on
this.
> David
> ----- Original Message -----
> From: "Paul B" <paul_victor@hotmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, May 07, 2002 9:49 AM
> Subject: Re: [PSUBS-MAILIST] O2
>
>
> > As far as I know, oxygen is divided into 3 major groups:
> >
> > 1. Medical
> > 2. Aviation
> > 3. Welding
> >
> > To get medical grade O2, you DO have to have a prescription. Now, in
case
> > with aviation grade as far as I know it's the same purity as medical.
The
> > difference is that you don't need a prescription to get it; and a tank,
> > unlike in case with medical grade, does not have a unique serial number
> each
> > individual cylinder can be traced by, only the lot number. I think
they're
> > doing it in case of medical grade because life and death depend on it -
> they
> > need a way to find out where the stuff came from if something goes badly
> > wrong.
> >
> > Medical and aviation O2 cylinders are getting purged of all gases before
> > they're filled with gas. Welding grade O2 cylinders are not. There's no
> > telling what could be in it other than O2. For all you know, it could be
> CO
> > or some other pretty nasty stuff.
> >
> > However, welding O2 manufacturers say it's critical to have very pure O2
> for
> > metal cutting purposes, so I guess that stuff should be more than fit to
> > breathe.
> >
> > I'd try my chances trying to get aviation grade first. And then, if I
> > failed, I would talk directly to the manufacturer of welding grade O2
and
> > ask him about chemical contents of his product.
> >
> > Sincerely, Paul.
> >
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