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SCUBA-L  September 1999, Week 4

SCUBA-L September 1999, Week 4

Subject:

Re: Enriched Air (was Re: TEST YOUR KNOWLEDGE)

From:

Ed Graves <[log in to unmask]>

Reply-To:

Scuba diving discussion list <[log in to unmask]>

Date:

Tue, 21 Sep 1999 09:00:30 -0700

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (68 lines)

Thanks Carl.  So I should dig out that old steel 72 of
mine & get the appropriate EAN mix and hang it under
my left armpit as a stage bottle?
Ed
 
--- "Carl G. Heinzl" <[log in to unmask]> wrote:
> Ed Graves wrote:
> >
> > Haven't taken the class yet, but it sounds like
> you
> > have a good point Art.
> > I got to thinking about what I wrote & how the
> other
> > diver used his pony on every safety stop.  In this
> > case he uses a 19cf pony with a 40% mix.  He does
> 5
> > dives & 5 safety stops, of at least 3 minutes.
> You
> > can't get EAN on the island we were on so no
> chance of
> > re-filling the pony.  We were doing fairly deep
> dives,
> > 80 - 100fsw, if he had had to use the pony in an
> > out-of-air situation, let's say at the  beginning
> of
> > the 5th dive, chances are he wouldn't have had
> much to
> > work with.
> > Thoughts?
> > Ed
>
> Let's do the math.  4 safety stops of 3 minutes each
> is 12 minutes total.  He's at 15' (let's say 1.5 ATA
> for round numbers).  If we use the round number of
> 1 cu ft/minute as his SAC then his rate at 1.5ATA is
> 1.5 cu ft/minute and he would have used up 18 cu ft
> on the pony - it's virtually empty (157 PSI left if
> it's a 3000 psi pony).  But, if we use .75 cu ft/min
> as his SAC then he would only have used 13.5 cu
> ft as of the end of his 4th dive, leaving him with
> 5.5 cu ft (868 PSI).  That's enough to get him
> out of a small jam, but as far as I'm concerned a
> 19 cu ft pony is the absolute SMALLEST pony
> that's usable.  I much prefer a 30 (typically
> 33 cu ft) or 40 (which is what I have) cu ft
> pony.
>
> If you want to use it as an O2 bottle, then an
> LP steel tank is better because O2 is typically
> only available around 2200 PSI.  There are 45 cu
> ft LP steels available that are a nice tank
> for that purpose.
>
> By the way, for the person who said they wouldn't
> use nitrox until they were trained for it...
> Air *IS* nitrox, by definition :^)  What you should
> have said was that you wouldn't use EAN (enriched
> air nitrox) or, even a bit more sublte,
> non-normoxic nitrox (i.e. a nitrox mixture OTHER
> than 21/79) :^)
>
> Carl
>
 
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