Bullshit, and again from the usual do nothing bullshitters. Imbert knows
less about deco than a dog. We changed all of Bullmanns stuff completely
around, and when you can do it like we do it, moron, you can tell me that
those who have long ago been proven wrong are right.

It does not occur in any situation that involves diving where the gradients
are not violated. The only time the sum of the partial pressures is out of
balance is due to the oxygen window, and that certainly does NOT cause any
problems.

Now maybe you can tell us all how this fairy tale applies to diving, and why
saying asinine things like "get off the helium as fast as you can" is
anything but crap.

You rack up my experience and the combined decompression experience of the
WKPP and then tell us all about deco. Funny , we are the ones that the
parties who have an interest now study, not any of the once upon a times
that you mention.
----- Original Message -----
From: "Matthias Voss" <mat.voss@t-*.de*>
To: "Trey" <trey@ne*.co*>
Cc: "Alain Tésio" <alain@on*.or*>; <scottk@nw*.co*>; "Techlist"
<techdiver@aquanaut.com>
Sent: Friday, April 20, 2001 7:54 AM
Subject: Re: Counter diffusion


> You are wrong, Trey, and Alain is right.
> I would only modify the essence to :
> If bubbles occur during a static gas change, this happens because of
> counterdiffusion, and because of a certain choice of gases, and switch
> depth.
> It can be avoided if the above conditions are not met.
> If you need know more, get in touch with Dr. Aspacher ( he wrote a
> monography on isobaric counterdiffusion, there you may find the evidence
> , and why some ( few) are affected, majority not.
> Bühlmann ( page 67-71), Lambertsen et.al., Lettnin, ( page 223) / Imbert
> proved, that the sum of partial pressures , when certain conditions are
> met, can be eqal or greater than ambient pressure.
> However, this holds mostly for chamber situations.
>
> Horseshit physicians and PH D's, arent't they ?
>
> Matthias
>
> Trey schrieb:
> >
> > Total and complete bullshit. This is the stupidest thing I have read on
here
> > in years. Partial pressures are not going to create bubbles, only
absolute
> > differentials. Otherwise we would all get bent going to oxygen, right?
You
> > obviously do not dive, do you.
> >
> > This is a fairy tale used to explain why misfits get bent. It is total
and
> > complete bullshit. We in WKPP do dives involving five gas changes and
the
> > fastest deco from saturation on the planet, and nobody gets bent in any
> > fashion.
> >
> > If this horseshit were even close to true, we would not be using deco
gases,
> > now would we.
> >
> > -----Original Message-----
> > From: Alain Tésio [mailto:alain@on*.or*]
> > Sent: Thursday, April 19, 2001 6:38 PM
> > To: scottk@nw*.co*; Techlist
> > Subject: Re: Counter diffusion
> >
> > Counter diffusion occurs when switching gases, the common
> > picture is "isobaric counter diffusion" because bubbles
> > appear though you don't change the depth, which can't happen
> > in theory with no gas change :
> > when you change from nitrox to heliox, as helium diffuses
> > faster than nitrogen gases out, for some time the total
> > partial pressure of inert gases will increase which can
> > mean bubbles.
> >
> > It isn't something which is absolutely required to know
> > for tech diving, at least if you follow the common
> > procedures and don't play the random gas wizard, but it's
> > a must for hyperbaric specialists.
> >
> > They know how to deal with  decompression illness with gases
> > other than air, at least in Europe when professional divers
> > use heliox for 30 years, however it may be a problem
> > in areas having experience only with recreational
> > diving.
> >
> > If there is one thing to remember, it is that you shouldn't
> > breath nitrox when you go to the chamber after of a
> > trimix accident.
> >
> > The other way is ok though, it's essentially a specialist
> > affair, but using heliox 50 for air accident is ok.
> >
> > Alain
> >
> > ----- Original Message -----
> > From: "Scott" <scottk@nw*.co*>
> > To: "Techlist" <techdiver@aquanaut.com>
> > Cc: "Trey" <trey@ne*.co*>
> > Sent: Thursday, April 19, 2001 6:38 PM
> > Subject: Counter diffusion
> >
> > > George,
> > >
> > > Can you put the issues of "counter diffusion" into language a Jarhead
can
> > > understand?
> > >
> > > I was accosted this past week by a "Master Diver" who warned us that
"If
> > you
> > > have to take a chamber ride after breathing that shit (helium) it will
> > kill
> > > you."
> > >
> > > I was so stunned by his position and attitude that I just nodded and
> > > listened.
> > >
> > > Plus, I have no idea what counter diffusion is, or if or why it is an
> > issue
> > > to SCUBA divers.
> > >
> > > Scott
> > >
> > > --
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