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Date: Tue, 25 Nov 1997 19:38:36 -0500 (EST)
From: "William M. Smithers" <will@tr*.co*>
Subject: RE: THE FACTS: TDI Training Death, 16 April 1997
To: Jon Breazile <breazile@ne*.co*>
Cc: techdiver@aquanaut.com

Yeah, that's pretty close.  Decom uses a straight Buhlmann - it's
a good package.  The figures between two implementations will
never match up perfectly.  This has to do with sample rates,
calculation of ascent/descent rate, and how ascent rates
are factored into stops.

-Will

On Tue, 25 Nov 1997, Jon Breazile wrote:

> William M. Smithers Wrote:
> >Glad you asked, but it's moot, because since I went closed-circuit, I only
> >dive Heliox below 150ft, then switch to N2 diluent for deco.
> 
> We are comparing apples to oranges, so to compare notes here is what I
> get when I use the same deco gasses (I normally use 35%, and 100% O2, but
> add a 50% if it's deep or long BT). Running Decom I get:
> 
> Depth        BT
> -----        --
> 300          25    14/50
> 150           2    14/50
> 140           2    14/50
> 130           2    14/50
> 120           2    EAN 35
> 110           1    EAN 35
> 100           3    EAN 35
>  90           2    EAN 35
>  80           4    EAN 35
>  70           4    EAN 50
>  60           6    EAN 50
>  50           6    EAN 50
>  40          12    EAN 50
>  30          14    EAN 50
>  20          21    100%
>  10          30    100 %
> 
> I would then add a 1 minute stop at 230 and 160, and keep my ascent rate
> at about 30ft/min until about 120 then 10ft/min (don't want those bubbles
> forming). I also do all of my 10ft stop at 20ft, and nail all the deep and 
> intermediate stops. If I blow off some of the 20 ft stop, then it is not as 
> bad as missing the deep or intermediate stuff.
> 
> The water temp is high 40's to low 50's, and I run Argon. I run additional
> tables for a 5 min bounce (aborted) dive, and I like to see what happens
> if I blow my BT.
> 
> I don't re-run decom after I add the deep stops. I consider it deco. I usually
> start my BT at 120.
> 
> -Jon
> 
--
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