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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. 
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.

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.
-- 
Anthony DeBoer         adb@he*.re*.or* (here)   adb@ge*.co* (work)

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