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
>
> --
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