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Thank you all for the replies. It's what I thought, but I wanted to make =
sure I wasn't missing anything obvious.=20
Just wanted to make sure as I am about to order my new twinset for the =
trip to Scapa Flow in June. (Kronprinz Wilhelm here I come!)
Chris
P.S. What agency do people recommend for doing a Nitrox course? I want =
it specifically for accelerated decompression after wreck dives. =
Unfortunately my budget precludes a flight to the US to do a GUE course! =
(That's for the cave course in a few years time...) :-)
----- Original Message -----=20
From: George Irvine=20
To: Chris Tibble ; techdiver@aquanaut.com=20
Sent: Thursday, April 12, 2001 11:57 PM
Subject: Re: Isolating Manifold Question
Chris , what you will learn is that if IANTD teaches it, it is =
probably wrong. This particular piece of farm animal stupidity is from =
IANTD. Only the worst idiot would tell you to keep your crossover close =
to closed .
This is a huge risk for gas mixing error, and there are no benefits. =
Manifolds do not "fail", per se, they begin to leak ( I am not talking =
about real pieces of shit, but a good manifold). The failure mode is =
knocking off the right side knob ( in the on position) and then having =
that reg freeflow, forcing you to shut down the isolator to save your =
gas - a two part failure.=20
Failure to mix the gas properly is the real risk. In the WKPP, we do =
not allow anything this stupid , or most anything else like this taught =
by IANTD.
----- Original Message -----=20
From: Chris Tibble=20
To: techdiver@aquanaut.com=20
Sent: Thursday, April 12, 2001 1:28 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=20
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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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Thank you all for the replies. It's =
what I thought,=20
but I wanted to make sure I wasn't missing anything obvious. =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Just wanted to make sure as I am about =
to order my=20
new twinset for the trip to Scapa Flow in June. (Kronprinz Wilhelm here =
I=20
come!)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV>Chris</DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>P.S. What agency do people recommend =
for doing a=20
Nitrox course? I want it specifically for accelerated decompression =
after wreck=20
dives. Unfortunately my budget precludes a flight to the US to do a GUE =
course!=20
(That's for the cave course in a few years time...)
:-)</FONT><BR></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dkirvine@sa*.ne* =
href=3D"mailto:kirvine@sa*.ne*">George Irvine</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dchris.tibble@bt*.co*=20
href=3D"mailto:chris.tibble@bt*.co*">Chris Tibble</A> ; <A=20
title=3Dtechdiver@aquanaut.com=20
href=3D"mailto:techdiver@aquanaut.com">techdiver@aquanaut.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 12,
2001 =
11:57=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Isolating
Manifold =
Question</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D4>Chris , what you will learn is that if IANTD =
teaches it, it=20
is probably wrong. This particular piece of farm animal stupidity is =
from=20
IANTD. Only the worst idiot would tell you to keep your crossover =
close to=20
closed .</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D4>This is a huge risk for gas mixing error, and =
there are no=20
benefits. Manifolds do not "fail", per se, they begin to leak ( =
I am not=20
talking about real pieces of shit, but a good manifold). The failure =
mode is=20
knocking off the right side knob ( in the on position) and then =
having=20
that reg freeflow, forcing you to shut down the isolator to save =
your gas=20
- a two part failure. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D4>Failure to mix the gas properly is the real risk. =
In the=20
WKPP, we do not allow anything this stupid , or most anything else =
like this=20
taught by IANTD.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dchris.tibble@bt*.co*=20
href=3D"mailto:chris.tibble@bt*.co*">Chris Tibble</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dtechdiver@aquanaut.com=20
href=3D"mailto:techdiver@aquanaut.com">techdiver@aquanaut.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 12, =
2001 1:28=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Isolating
Manifold=20
Question</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Just a quickie. I'm just about to =
buy my first=20
twinset with a manifold. I've dived twins before, independents =
because of=20
fiscal reasons (I'm a poor student!) What I need to know is this. =
Some of=20
the people I have talked to who dive manis only open their iso knob =
about=20
1/2 a turn, whilst others open it all the way. Thinking about it I =
can see=20
advantages and disadvantages to both:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>All the way</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Adv: =
No=20
risk of turning wrong way</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Disadv: May get =
stuck if=20
turned on all way</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> =
=20
Have to turn it 3 turns (or=20
whatever)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Part way</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Adv: =
V=20
fast way of isolating</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Disadv: Can turn =
it the wrong=20
way </FONT></DIV>
<DIV><FONT face=3DArial=20
=
size=3D2> &nbs=
p; Not=20
having it open all the way may limit equalisation across the=20
manifold.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Now any or all of this may be =
unmitigated=20
rubbish, but it's just what I was thinking about last =
night.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Any comments/suggestions as to how =
best to do=20
it?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>As this is my first post, go easy =
on me - I'm=20
still learning!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Many thanks,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Chris</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>--</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>It takes a big man to cry, but it =
takes a=20
bigger man to laugh at that man.<BR></DIV>
<DIV><BR></DIV></BLOCKQUOTE></BLOCKQUOTE></FONT></BODY><
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