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I don't think it is "common sense" that a valve be fully open or
fully shut.  That is a matter of opinion.  Clearly there are
arguments/opinions
for either method (fully open or partially shut).

dsmith218@ho*.co*
ICQ# 25409809

Moderation is for the poor, and the healthy...of which I am neither. -
Polver




-----Original Message-----
From: RDecker388@ao*.co* [mailto:RDecker388@ao*.co*]
Sent: Saturday, April 14, 2001 7:55 PM
To: rikard.lundgren@sw*.se*
Cc: techdiver@aquanaut.com
Subject: Re: Isolating Manifold Question


In a message dated 4/14/01 9:55:22 AM Eastern Daylight Time,
rikard.lundgren@sw*.se* writes:

> >As for the 3/4 of European divers using this method, divers taking there
> first steps into tech training , do so with IANTD or TDI,
>    >, as shut downs are apart of syllabus, my instructor  & people i have
> listened to use this method, and as far as i a aware As the said
> organisations are wide spread >around Europe , i can only conclude that
they
> are also shown this method.
>


I suspect this is more a matter of the individual instructor than what's
actually in the standards.  I've read both of these agency's standards at
one
time or another and do not recall a single line about requiring paritially
open ISOs.

Common sense dictates that all valves need to be either all the way on or
all
the way off.  In a stressful situation requiring a valve shut-down it would
be way too easy to turn the valve the wrong way if it's only partly open.
With a strict on/off approach, the valve is only going to turn one way......
THE RIGHT ONE!  Bare handed, gloves or mitts, shutting down a valve is not a
difficult matter with a little practice.

Bob D.
www.SportDiverHQ.com
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