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I said in there that you need a booster pump - that makes it impractical for
those who don't have it, and most dive shops do not have them either.
In some locations , you can get high pressure helium supply bottles.
Let me repeat, I said it would be preferred for all gases, but high helium
content is essential for deep gases.
-----Original Message-----
From: Andrew Ross [mailto:andrew.ross@ma*.co*]
Sent: Friday, February 08, 2002 12:07 AM
To: 'trey@ne*.co*'; Dogtrner1@ao*.co*; Techdiver@Aquanaut.Com
Subject: RE: Decompression DIR style
George,
Thanks for taking the time to disseminate this info, there are a lot of us
looking forward to the follow ups to come.
You mentioned heliox and how it is "impractical for most of us". As I am
new to Trimix and have never used Heliox, could you explain what you mean?
Thanks
Andy
-----Original Message-----
From: George Irvine [mailto:girvine@be*.ne*]
Sent: Thursday, 7 February 2002 10:48 PM
To: Dogtrner1@ao*.co*; Techdiver@Aquanaut.Com
Subject: RE: Decompression DIR style
Karla, let me get to that one once we have explained the full story on
deco. The full story entails the physiological aspects. This is where helium
shines. I will go over all of that.
The short answer is that what goes in fast also goes out fast, helium
causes no damage and thus no immune system response as does nitrogen, it is
easier to breathe, it solves other problems ( like narcosis for deep deco),
it does not already exist in the body or have any function in our
physiology.
If you had your choice of any gas to dive, it would be heliox for
everything. As this is impractical for most of us, we try to do it as close
to what is optimal given the resources at our command. I have a Haskel pump,
and I still don't do it. Luckily, the presence of helium in at least 25-30%
of the mix seems to be enough to hold off the stiffening effects on red
cells at shallower depths. Deeper , I push the helium into the 60-70 range.
With Luxfer 80's in fresh water, 65% seems to be the level that makes the
bottles neutral when full, a big advantage for long range multi stage
diving, but that is another topic.
I'll get to it fully in the posts to follow. I want to be sure everyone
can see the basic hemodynamics of this from the first post so that the rest
does not look like bullshit.
-----Original Message-----
From: Dogtrner1@ao*.co* [mailto:Dogtrner1@ao*.co*]
Sent: Thursday, February 07, 2002 6:09 AM
To: trey@ne*.co*
Subject: Re: Decompression DIR style
In a message dated 2/6/2002 10:20:26 PM Eastern Standard Time,
girvine@be*.ne* writes:
Most of you are familiar with the worst of them, which is "get off
the
helium as fast as you can". If dive instructor has told you that,
you are
dealing with the worst kind of idiot.
Could you explain. The reason I was told this was because your tissue
saturation is so quick with helium.
I am willing to agree that it might be wrong. But why is it wrong?
Permission to repost this to the list.
Karla
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<BODY>
<DIV><SPAN class=3D337110411-08022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>I said=20
in there that you need a booster pump - that makes it impractical for =
those who=20
don't have it, and most dive shops do not have them =
either.</FONT></SPAN></DIV>
<DIV><SPAN class=3D337110411-08022002><FONT face=3DArial
color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D337110411-08022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>In=20
some locations , you can get high pressure helium supply=20
bottles.</FONT></SPAN></DIV>
<DIV><SPAN class=3D337110411-08022002><FONT face=3DArial
color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D337110411-08022002><FONT face=3DArial
color=3D#0000ff =
size=3D2>Let me=20
repeat, I said it would be preferred for all gases, but high helium =
content is=20
essential for deep gases.</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Andrew Ross=20
[mailto:andrew.ross@ma*.co*]<BR><B>Sent:</B> Friday, February =
08, 2002=20
12:07 AM<BR><B>To:</B> 'trey@ne*.co*'; Dogtrner1@ao*.co*;=20
Techdiver@Aquanaut.Com<BR><B>Subject:</B> RE: Decompression DIR=20
style<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002>George,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002>Thanks for taking the time to disseminate =
this info,=20
there are a lot of us looking forward to the follow ups to=20
come.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D228090105-08022002>You=20
mentioned heliox and how it is "impractical for most of us". As I am =
new to=20
Trimix and have never used Heliox, could you explain what you=20
mean?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002>Thanks</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D228090105-08022002>Andy</SPAN></FONT></DIV>
<BLOCKQUOTE style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> George
Irvine=20
[mailto:girvine@be*.ne*]<BR><B>Sent:</B> Thursday, 7 February =
2002=20
10:48 PM<BR><B>To:</B> Dogtrner1@ao*.co*;=20
Techdiver@Aquanaut.Com<BR><B>Subject:</B> RE: Decompression DIR=20
style<BR><BR></DIV></FONT>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Karla, let me get to that one once we have explained the =
full story=20
on deco. The full story entails the physiological aspects. This is =
where=20
helium shines. I will go over all of that.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>The short answer is that what goes in fast also goes out =
fast, =20
helium causes no damage and thus no immune system response as does =
nitrogen,=20
it is easier to breathe, it solves other problems ( like narcosis =
for deep=20
deco), it does not already exist in the body or have any function in =
our=20
physiology.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff size=3D2>If=20
you had your choice of any gas to dive, it would be heliox for =
everything.=20
As this is impractical for most of us, we try to do it as close to =
what is=20
optimal given the resources at our command. I have a Haskel pump, =
and I=20
still don't do it. Luckily, the presence of helium in at least =
25-30% of the=20
mix seems to be enough to hold off the stiffening effects on red =
cells at=20
shallower depths. Deeper , I push the helium into the 60-70 range. =
With=20
Luxfer 80's in fresh water, 65% seems to be the level that makes the =
bottles=20
neutral when full, a big advantage for long range multi stage =
diving, but=20
that is another topic.</FONT></SPAN></DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D770023811-07022002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>I'll get to it fully in the posts to follow. I want to be =
sure=20
everyone can see the basic hemodynamics of this from the first post =
so that=20
the rest does not look like bullshit.</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
Dogtrner1@ao*.co*=20
[mailto:Dogtrner1@ao*.co*]<BR><B>Sent:</B> Thursday, February
07, =
2002=20
6:09 AM<BR><B>To:</B> trey@ne*.co*<BR><B>Subject:</B>
Re: =
Decompression=20
DIR style<BR><BR></FONT></DIV><FONT
face=3Darial,helvetica><FONT =
size=3D2>In a=20
message dated 2/6/2002 10:20:26 PM Eastern Standard Time,=20
girvine@be*.ne* writes: <BR><BR><BR>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff =
2px solid; MARGIN-RIGHT: 0px"=20
TYPE=3D"CITE">Most of you are familiar with the worst of them, =
which is=20
"get off the <BR>helium as fast as you can". If dive =
instructor=20
has told you that, you are <BR>dealing with the worst kind of=20
idiot.</FONT><FONT lang=3D0 face=3DArial color=3D#000000 =
size=3D3=20
FAMILY=3D"SANSSERIF"></BLOCKQUOTE><BR></FONT><FONT lang=3D0
=
face=3DArial=20
color=3D#000000 size=3D2 FAMILY=3D"SANSSERIF"><BR>Could you =
explain. The=20
reason I was told this was because your tissue saturation is so =
quick with=20
helium. <BR><BR>I am willing to agree that it might be wrong. =
But=20
why is it wrong? <BR><BR>Permission to repost this to the list.=20
<BR>Karla</FONT> =
</FONT></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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