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To: "David Giddy" <d.giddy@tr*.oz*.au*>
Subject: RE: Reduced air Nitrox ?
From: "HeimannJ" <heimannj@ma*.nd*.gt*.co*>
Cc: "techdiver" <techdiver@opal.com>
Date: 8 Feb 1995 19:01:57 -0500

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To: David Giddy
Cc: techdiver
From: HeimannJ on Wed, Feb 8, 1995 7:01 PM
Subject: RE: Reduced air Nitrox ?
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Date: Wed, 8 Feb 1995 10:39:31 +1100
From: David Giddy <d.giddy@tr*.oz*.au*>
Message-Id: <199502072339.KAA01819@br*.tr*.oz*.au*>
To: techdiver@opal.com
Subject: Re: Reduced air Nitrox ?
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Dave Giddy writes:

>...
>My primary suggestion is that in the range of 50-80m (160'-260'), something
>like Nitrox-10 or even Nitrox-5 may be a safer breathing gas than air. 
>...

Why would 5-10% O2 Nitrox be safer than 16-18% O2 Nitrox (PP02=1.4-1.6 ATA at
80m, the deepest depth in your range)?  The basic nitrox rule of using the max
FO2 possible within CNS tox constraints still applies here.  EAN16-18 has
acceptible PPO2s as depth, and much friendlier decompression (which I consider
to be "safer") than EAN5-10.   Moreover, EAN16-18 can be breathed at the
surface, which EAN5 or EAN10 cannot be.

John
Heimannj@ma*.nd*.gt*.co*

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