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Tony,

I must be missing something.

How exactly does an isolator open 1/2-2 turns get shut down during a dive?
Ever seen or heard of a diver having experienced an isolator shut down from
contact with anything?  I haven't.  My personal experiences have shown that
the only valve subject to inadvertent shutdown is the on the left post.

I'd hate to burst your bubble, but your group of divers may not be the only
people on the face of this planet who practice shutdowns regularly.  And no
matter how many times I practice I can still shutdown an isolator partially
closed quicker than one fully open.  Just like I can run 1 mile quicker than
2 no matter how hard I train.

Regards, John


-----Original Message-----
From: Tony Profera 
To: Jim Cobb 
Cc: John Chluski ; Techdiver List

Date: Friday, March 27, 1998 9:38 PM
Subject: Re: seeking opinions on isolator valves


>Jim;
>     Exactly! The isolator needs to remain OPEN! Seems to me that the
reason
>to only open the isolator a turn or two is to aid in shutting it down -
NOT!
>This is faulted thinking and as you suggest may indeed cause a problem.
>   Question: Just what do you dudes do when you are hanging for an hour or
>more (caves or wrecks)??? It has been a long time since we've seen anyone
>outside our group practice shut down drills while hanging. Once you do it a
>bunch it becomes second nature (the sub conscious ingrains) and you too
will
>want the damn thing open all the way. Geez, some of you guys act like you
are
>Gene Hackman trying to turn that giant stuck valve in the Poseidon
Adventure.
>For pete's sake its right behind you head and unobstructed (unless you are
>silly enough to have hose stuffed there or have a roll bar). Practice is
what
>makes the difference.
>Tony Profera
>


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