On 25 Mar 2002, at 6:46, David Hale wrote:

> --- Mike Wallace <[log in to unmask]> wrote:
> > > On Saturday, March 23, 2002 11:51 PM, Robert Delfs
> > wrote:
> >
> > >
> > > O2 cleaned assumes that all hydrocarbons and
> > contaminants have been
> > > removed. In those cases it's generally accepted
> > that they're then safe to
> > > use with O2 mixes up to 50%.
> >
> > A couple of very good points. David Hale can attest
> > to the difference, right David? :-)
>
> Let's not go there! Apparently some shops need a
> reminder of cleaned vs. compatible in the case of a
> clyinder dedicated for 100% Oxygen use!!

Hehehe.... sorry couldn't resist!


>
> When we were discussing the multiple levels of EANx
> Diver certifications, there was a point I wanted to
> bring up. There is kind of a dividing line in EANx use
> at around 40%. Most always, a mix of over 40% oxygen
> is being used for decompression (or as a "travel"
> mix), which is an entirely different game. That DOES
> need to be a separate course, which I think for TDI
> may be staged deco diver, and for IANTD formerly was
> the Technical Nitrox course (dunno what it is now).

I agree that mixes of over say 40% indicate a different use than
would be typical of recreational divers and that a higher level of
training would be necessary for their use. I just see the agencies
using it to bleed off more from the wallets of the students.
For TDI, you have the Deco procedures course which teaches the
use of the higher mix gases after you have done the advanced nitrox
course.

>
> BTW if you wanna see a real oddball card sometime,
> I'll show you my IANTD EANx Cave Diver card. It was
> basically the equivalent of Technical Nitrox, which
> actually was a pretty tough exam. I had to know some
> physics (inside joke with Mike W.)

Heheheheeh......


>
> David H.
>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mike Wallace
Wilson Lumber Company, Inc.
256.852.7411 x225
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