We calculate the 1.4 as to the max possible depth hit and for a short dive.
In practice, I use .8 - 1.0. Remember, we use helium in everything so there
is no big nitrogen problem to deal with.

For deco, the 1.6 is the max at the deepest stop the for which the gas could
be used, and is not done for long exposures at the deeper stops, but only at
the upper stops.

----- Original Message -----
From: "David B. Widen" <dwiden@TW*.co*>
To: "Trey" <trey@ne*.co*>; <cobber@ci*.co*>; "Chris Stenton"
<jacs@gn*.co*.uk*>
Cc: "dmdalton" <dmdalton@qu*.ne*>; <dwiden@ho*.co*>;
<donburke56@ne*.ne*>; "'Paul Braunbehrens'" <Bakalite@ba*.co*>;
<techdiver@aquanaut.com>
Sent: Wednesday, October 11, 2000 6:16 AM
Subject: RE: rec trimix


> 1.4 is the max working with 1.6 max deco. We generally target 1.1 - 1.2 in
> our water for backgas due the conditions and CNS managemetn.
>
> Davif
>
> -----Original Message-----
> From: Trey [mailto:trey@ne*.co*]
> Sent: Tuesday, October 10, 2000 8:03 PM
> To: cobber@ci*.co*; Chris Stenton
> Cc: dmdalton; dwiden@ho*.co*; donburke56@ne*.ne*; 'Paul
> Braunbehrens'; techdiver@aquanaut.com
> Subject: Re: rec trimix
>
>
>
>
> 1.4 is the max working ( as opposed to decompressing) ppo2. The longer the
> dive, the lower the ppo2 needs to be. Commercial diving figured this out a
> long time ago, and they are using helmets. Cobb is correct . Your "panties
> in a wad" comment about 6 minute miles is typical - dive instructor , eh?
>
> ----- Original Message -----
> From: "Chris Stenton" <jacs@gn*.co*.uk*>
> To: <cobber@ci*.co*>
> Cc: "dmdalton" <dmdalton@qu*.ne*>; <dwiden@ho*.co*>;
> <donburke56@ne*.ne*>; "'Paul Braunbehrens'" <Bakalite@ba*.co*>;
> <techdiver@aquanaut.com>
> Sent: Tuesday, October 10, 2000 2:26 PM
> Subject: Re: rec trimix
>
>
> >
> > > I know this is going to piss off a lot of rec divers but I believe
that
> > >increasing your bottom PP02's for the purpose of avoiding a deco
> obligation is
> > >a really stupid idea. It is typical of our sport that this principle is
> > >embraced by almost everybody. Even to the point of calling potentially
> deadly
> > >hyperoxic mixes "safeair".
> >
> > >I think there should be an industry-wide ban of bottom or working
PP02's
> of
> > >anything over 1.2.
> >
> > Jim,
> >
> > Give us some statistics or physiology  to back this up. I haven't seen
one
> > report of a recreational "no stop dives" diving  death or oxtox hit
> attributed
> > to using Nitrox at a ppO2 of 1.4 or below here in the UK.
> >
> > Far more important surely is getting the people "at risk" out to do some
> more
> > exercise. How about removing people cert cards who can't run a 6min
mile;
> far
> > more likely to reduce the work load of the emergency services than some
> > arbitrary ppO2 limit of 1.2.
> >
> >
> > Chris
> >
> > --
> > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

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