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>Kevin-Neil Klop  <kevink@ap*.co*> wrote:
>> ...
>>One first stage and one second stage on my main tank.  One first stage 
>>with two second stages on my secondary tank.  ...
>>Note that this arrangement is for dealing with two independent air 
>>sources (not manifolded together).
>
>I dive independent doubles too, but with only one second stage per tank.

Umm... I DON'T dive independents anymore, actually, unless you consider a 
pony bottle as an independent... ::grin::  I find manifolds much better.
 
>This is based on a philosophy of always having at least enough air in
>each tank for a diver to safely end the dive, so if my buddy has a
>problem I could hand off either reg to him and we start upwards, and if I
>have a problem I can switch to the other tank.  The only situation in
>which you say you'd use both regulators on your second tank is in case
>your buddy comes to you for air after you've switched to tank two
>yourself, but I'd advocate switching while there's still enough air in
>tank one that it'll have enough for him to terminate the dive.

I agree with this philosophy _in_theory_.  The problem here is knowing 
how much air your buddy will need.  Are you monitoring THEIR air supply 
so that you know what their consumption rate is, add in some fudge factor 
(how big of one) to deal with the increased air consumption of a stressed 
diver, plus the slower movement of two people trying to swim in 
formation?  Please note, I'm not attacking you or your way of diving, I'm 
honestly interested in your procedures.

>
>With two divers carrying two systems each, it'll take three major
>failures before you're in trouble.  Remember that he has to have two
>major failures before he'd come to you for air in the first place.


        -- Kevin --
        kevink@ap*.co*

It is hard to disagree with a pro-survival decision,
     It is even harder to engage in prolonged arguments
          with someone who consistently makes anti-survival decisions.

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