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
>
> --
> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]