Bill Mee and I were diving with Mouth one day and he suddenly flashes us and
goes to his isolator: hisssssssssssssss - and he gives us the thumb. That
was 9 years ago and I hear IANTD still tells people to keep the isolator
mostly closed. The reason? Because WKPP requires that it be kept open, no
more, no less.

In that case, for a moment I was scared that Mouth would tox, but then I
remembered he had analyzed his gas. What apparently happened is that the
isolator must have somehow become completely closed after the gas was mixed
and analyzed or was restricted enough that is was not keeping up with the
other tank until Tom opened it more, and when he heard the hiss he correctly
called the dive, not knowing now which was which. Here we are nine years
later. Anyone see a pattern here?


-----Original Message-----
From: Terry Michael [mailto:terry-1@ly*.co*]
Sent: Friday, April 20, 2001 10:38 PM
To: David E. Smith; Phi Le; adrian scothern; George Irvine;
techdiver-aquanaut.com; Chris Tibble; Trey
Subject: RE: Isolating Manifold Question


The debate back in 97 was over to even have an isolator on the manifold.
There was an oxygen toxicity scenario where this guy does a nitrox fill and
somehow the isolation is shut off during the fill and then only the left
cylinder is filled. He gets into the water not noticing the blunder and
convulses at 50 msw.

OK so you know the story.

But, inevitable for whatever reason somehow a set of doubles is magically
filled with the isolator valve closed and no body wants to take
responsibility or has any idea how that could have happened.

BTW- This has nothing to do with defending keep the isolator half way
closed/open or you’ll lose all the gas paranoia that personally make’s very
little since and seems a little dangerous in my humble opinion.



--

On Sun, 15 Apr 2001 19:29:43
 Trey wrote:
>Dave, are you telling me I am not smart enough to gas dive? Give it a rest,
>pal, you have no earthly clue. NONE. Take a seat. You don't get it and
>neither does IANTD, obviously.  Making a mixing error or a valve setting
>error is a death sentence for diver and or buddy, and is a function of
doing
>stupid things and following mindless practices like this that have no
>purpose what so ever other than to satisfy some ridiculous paranoia.
>
>This stupidity has all downside and no upside.
>
>
> -----Original Message-----
>From: David E. Smith [mailto:dsmith218@ho*.co*]
>Sent: Friday, April 13, 2001 11:42 PM
>To: Phi Le; adrian scothern; George Irvine; techdiver-aquanaut.com; Chris
>Tibble
>Subject: RE: Isolating Manifold Question
>
>
>  I would like to personally thank Phi Lee for being so smart as to catch
>  the "subtle" difference between 2 half turns and 1 full turn.  I realize
>that
>  I as a mere mortal can not turn a valve behind my head a complete
>revolution
>  without dislocating my wrist.  Apparently he can.  Thank you for posting
>  yet another useful message in the never ending "concentrate on the
>  minutia instead of the content post" mentality.
>
>  Also, not related to Phi's post,  It seems to me that the how one would
>want
>  a manifold isolator positioned for mixing gas is COMPLETELY separate from
>the
>  discussion of how you would want to position it for diving.  If you are
>not
>  intelligent to be able to position an isolator for mixing gas, you
>probably shouldn't
>  be mixing in the first place!
>
>  dsmith218@ho*.co*
>  ICQ# 25409809
>
>  Moderation is for the poor, and the healthy...of which I am neither. -
>Polver
>
>
>  -----Original Message-----
>  From: Phi Le [mailto:phi@sk*.be*]
>  Sent: Friday, April 13, 2001 9:15 AM
>  To: adrian scothern; George Irvine; techdiver-aquanaut.com; Chris Tibble
>  Subject: RE: Isolating Manifold Question
>
>
>  Adrian,
>
>  Do you think it would work with 1 full turn, or must it be *exactly* 2
>half turns ?
>
>  -Phi
>    -----Original Message-----
>    From: adrian scothern [mailto:ady@no*.fs*.co*.uk*]
>    Sent: Friday, April 13, 2001 12:38 PM
>    To: adrian scothern; George Irvine; techdiver-aquanaut.com; Chris
Tibble
>    Subject: Re: Isolating Manifold Question
>
>
>
>
>
>      Well, i've been diving with the ISO two half turns , since having a
>twin set!, and proberley 3/4 OF Europe dive's The BullShit Paranoia Way,
I'm
>Sorry that i've No Idea about Diving OH DEMI GOD OF THE UNDERWATER WORLD
>
>      -- Original Message -----
>        From: George Irvine
>        To: adrian scothern ; Chris Tibble ; techdiver-aquanaut.com
>        Sent: Friday, April 13, 2001 11:19 AM
>        Subject: Re: Isolating Manifold Question
>
>
>        And what bullshit paranoia do you attribute the "two half turns "
>to? This is the kind of mindless crap that gets people killed. I will say
>right here and now that you can come up with no reason to do something that
>stupid that makes any sense what so ever. Give it a try.
>
>
>          ----- Original Message -----
>          From: adrian scothern
>          To: Chris Tibble ; techdiver-aquanaut.com
>          Sent: Thursday, April 12, 2001 7:04 PM
>          Subject: Re: Isolating Manifold Question
>
>
>          I have the ISO two half turn's on, and I think the key is to ,
>Know your kit inside out, I've sat in the dark , in full kit for over 30
>hours ,every new bit of kit , i go through the same process, and Do know my
>current config  Insideout , the wife finds this highly amusing if/when she
>walks in . same goe's for inwater training dives .
>
>          ady
>
>            ----- Original Message -----
>            From: Chris Tibble
>            To: techdiver@aquanaut.com
>            Sent: Thursday, April 12, 2001 6:28 PM
>            Subject: Isolating Manifold Question
>
>
>            Just a quickie. I'm just about to buy my first twinset with a
>manifold. I've dived twins before, independents because of fiscal reasons
>(I'm a poor student!) What I need to know is this. Some of the people I
have
>talked to who dive manis only open their iso knob about 1/2 a turn, whilst
>others open it all the way. Thinking about it I can see advantages and
>disadvantages to both:
>
>            All the way
>            Adv:         No risk of turning wrong way
>
>            Disadv:     May get stuck if turned on all way
>                            Have to turn it 3 turns (or whatever)
>
>            Part way
>            Adv:        V fast way of isolating
>
>            Disadv:    Can turn it the wrong way
>                           Not having it open all the way may limit
>equalisation across the manifold.
>
>            Now any or all of this may be unmitigated rubbish, but it's
just
>what I was thinking about last night.
>
>            Any comments/suggestions as to how best to do it?
>
>            As this is my first post, go easy on me - I'm still learning!
>
>            Many thanks,
>
>            Chris
>
>
>            --
>            It takes a big man to cry, but it takes a bigger man to laugh
at
>that man.
>
>
>
>


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