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CHKBOONE@ao*.co* wrote:
> 
> Kevin,
> <snip>
> 40 cu ft is not enough.   If you run a 1/3 reserve on your deco gases you
> will need something on the order of 60 to 75 cu ft in many cases.   Make sure
> the valves on deco tanks are the same (yoke or din - recommend yoke) so you
> can switch regulators if needed.  Otherwise you will have no back up plan of
> any kind for deco gas regulator failure without hauling another 10 pounds of
> redundant regulators.

I was taught that you could use one gas as a bailout for another, in the event
of a gas failure (run out, lost stage cylinder, regulator problem.)You must have
a back up table. For instance, if Nitrox 32 fails, if you have a backup table,
you can deco on your bottom mix until you are shallow enough to start on the
80/20. Or if the 80/20 fails, you have the 32/68. This can be a long time in
the sea. Another option is to have octopus regs on all the stages, and have a
supply large enough for you and your buddy. I use an H valve on the 32/68, and
just a regular reg on the 80/20. This way, the 32/68 is backed up with a
redundant
reg, and the 32/68 is the back up for the 80/20.
 
> Gauges on deco gases???   They add weight and failure points and you will not
> have to worry about losing gases if these valves are off till needed.
>   Still, there may be times or conditions where they are wise since even
> though you can't often do anything about being low on a gas creative
> management during deco may be a factor in some cases.   They also let your
> partner know your status at a glance if it comes into question.

I always have them on the deco gas becuase good decisions can only be made on
good data. If a reg freeflows I can use it and tell when I'm going to need to 
do something different. I always use them becuase I try not to deviate 
configurations from dive to dive.

Why do you recommend yoke valves over DIN for the stage cylanders?

Tom
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