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Randy,
What would you do in the case of a catastrophic loss of air in your
primary 125, if you already had incurred a deco obligation of say
20mins? Depending on the depth you were at, and the depth/stop
requirement(s) for the deco, would your 30cf pony allow you to
complete ALL your deco? With manifolded doubles, you could simply shut
down the malfunctioning side without losing all of your back gas. Such
is not the case with a single primary. and a small redundant air
source might prove to be insufficient to complete deco requirements.
-Nathan...
Reason I'm asking is that I use a 30cf pony for recreational diving
<130ft, and the way I figure it is that if I lost all of my air in my
primary tank, the 30cf would be enough to get me back to the surface
with a 3-5min safety stop at 15ft, with a little extra. It is hard for
me to believe that you would have enough in a 30cf to do this, AND
complete all required deco stops for a decompression dive.
______________________________ Reply Separator _________________________________
Subject: Re: Fw: Pony Bottles
Author: "Randy Sullivan" <sulteck@ic*.ne*> at guardian
Date: 1/26/98 11:37 AM
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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