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Don:
For shits and giggles I ran a profile using a site I'm currently doing
some exploring at.
At an altitude of 1,000 feet with an hour of acclamation time, 3 hours
at 50 got me a mix of 39 - 40 EANx. with my target depth 72 ft, I got 43%
Eanx. Both were with a ppo2 of 1.38. I used GAP, which does not allow for
variances in temp. On both it does suggest an extended stop on 100% at 10
ft.- on the dive at 72 it adds a stop at 50 on 50% for ten minutes.
I'll do some more on ZPlan and DrX when I get home from diving ;-)
Like you, I'm anxious to hear what the others may have to say. I'm here
to learn, so I'll shut up. In the meantime I'm off to get wet.
Dive Safe
Brock
----- Original Message -----
From: Don Burke <donburke56@ya*.co*>
To: Sidney Brock Frederickson <Bfrede1615@em*.ms*.co*>
Cc: <techdiver@aquanaut.com>
Sent: Sunday, June 04, 2000 6:14 AM
Subject: Long time at shallow depth - was Re: Exposure 3h+
> Sidney:
>
> I'm not ignoring you. ;)
>
> The impression I have of trimix/heliox is that the
> helium is to keep you out of nitrogen narcosis and
> there is no advantage for avoiding DCS.
>
> At 50 feet, nitrogen narcosis wouldn't be an issue.
>
> I've never done a dive with helium and have never even
> run the numbers on a computer program, so I am at best
> semi-clueless on this subject.
>
> Since I really don't know the answer, I am going to
> shut up and see if anyone here can educate us both.
>
> TNX
> Don
>
> --- Sidney Brock Frederickson
> <Bfrede1615@em*.ms*.co*> wrote:
> > That's why I was wondering whether He would be
> > of any use in reducing
> > nitogen loading and keeping o2 levels normoxic- or
> > am I trying to make
> > something simple complicated? Trey, Jim, anyone?
> >
> > Dive safe
> > Brock
> >
> >
> > ----- Original Message -----
> > From: Don Burke
> > To: techdiver@aquanaut.com
> > Sent: Saturday, June 03, 2000 6:19 PM
> > Subject: Re: Exposure 3h+
> >
> >
> >
> > I'm not very well versed in the use of helium at
> > shallow depths.
> >
> > What are the advantages over, say, EAN 39?
> >
> >
> > Sidney Brock Frederickson wrote:
> > Peter:
> > This summer and Fall I'm planning some dives along
> > the same lines with
> > the Oklahoma Historical Society and then as part
> > of my cave training with
> > OCDA
> > I can tell you right off though that at those
> > temps and durations you can
> > plan on some decompression time. Maybe not the
> > massive times you've heard
> > of
> > , but enough to warrant a smallish stage (30-40
> > cf) bottle of O2. I trust
> > you are diving dry, staying well hydrated, and
> > using a p-valve.
> > Even tho the depth seems shallow, the temp and
> > duration make me think
> > that maybe helium would be a good idea here.
> > Anyone care to comment?
> > In the meantime If you want send me some of your
> > planned profiles and
> > I'll run them through Decoplanner and GAP.
> > Dive Safe
> > Brock Fredeickson
> > www.uwservicesllc.com
> >
> >
> > ----- Original Message -----
> > From: Peter Steinhoff
> > To: Techdiver
> > Sent: Wednesday, May 31, 2000 1:53 PM
> > Subject: Exposure 3h+
> >
> > What type of problems are you going to run into
> > when you extend the
> > running
> > time from 2 hours to 3-5 hours or so?
> >
> > I'm planning a "long" but very shallow (40-50ft)
> > dive, 45-55F.
> >
> > --
> > Peter Steinhoff
> > DIR diver (trying...)
> >
> >
> >
>
--
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