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Hey Folks:
I was wondering what the current thought is on isolator valves. I thought
that the general consensus was that they were just an extra failure point. The
reasoning (as I remember it) was that the only time you would need an isolator
valve is in the event of a neck o-ring failure on one of your valves. But the
isolator valve in itself contributed more of a liability since it was more
likely to fail than a neck ring. Or in the event of a collision which might
rupture a neck ring, the isolator valve was likely to be damaged as well, unless
you had a cage, in which case you wouldn't need the isolator anyways. So what's
the thought now?
Ben
Randy Sullivan wrote:
> I didn't think that would count. I can loosen the harness to get to the
> isolator. See what I did to be compliant, was to move the doubles so high
> on my back that I couldn't lift my head. This high mount lasted one dive &
> I went back to a stage mounted pony. I don't need a lot of air/gas. I
> dive a single 125 that covers my consumption requirements as I don't do deco
> in excess of 20 minutes.
>
> So I say why dive doubles if I don't need the volume and can always return
> to the surface at any point in the dive with my 30 pony.
>
> Randy Sullivan
> Sault Ste. Marie, Ont
> sulteck@ic*.ne*
> -----Original Message-----
> From: Jon Breazile <breazile@ne*.co*>
> To: sulteck@ic*.ne* <sulteck@ic*.ne*>; techdiver@aquanaut.com
> <techdiver@aquanaut.com>
> Date: Sunday, January 25, 1998 8:38 PM
> Subject: Re: Fw: Pony Bottles
>
> >>1.. The type of dry suit that wear does not allow you to shut down tank
> >>valves. I am a commercial diver first and have to wear a Viking because
> you
> >>can fix it fast and will hold up to extreme diving conditions. In all my
> >>years of running a charter operation, I saw VERY few diver could shut the
> >>isolator down because of the thickness of the underwear needed to dive
> cold
> >>water.
> >
> >I dive cold water with thick undergarments, etc. If you can't reach your
> knobs
> >then you need to get back in the pool until you can figure it out. If your
> >arms are short then you can still find a way to get those knobs shut down.
> >Most of the time I have to hike the tanks up my back to get a good grip on
> the
> >knobs, but I can do it. Jarrod told me about a guy (I think one of the WKPP
> >divers) that is short, and can not reach his valves, but he can shut them
> >down anyway. How does he do it? He unhooks his harness enough to get enough
> >slack to hike his tanks up so he can reach them (you have to have another
> clip
> >holding your light though). There are ways to get the job done without
> slobwinders.
> >
> >If you don't have the skill, don't do the dive until you learn. Don't
> compensate
> >by adding convoluted gear.
> >
> >-Jon
> >
>
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