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Rich (and others) wrote:
>> > All this talk of dissimilar tanks, doubles w/o manifolds and newbie 
>> > technical divers makes me want to remind everyone:
>> > 
>> > 	We all know of many "near-misses" and a couple of fatalities that 
>> > 	could have been avoided had a dual-outlet manifold been 
>> > 	properly used.
>> > 
>
>I have two different mixtures in my main doubles, so obviously I have a
>reason to use independant tanks.

Rich:
From the published descriptions, your rig is not fully redundant.
I am comparing with for instance a typical deep air diver, with either
fully independent doubles, or doubles with an isolating manifold.

You seem to have bought off on the theory that a Y-valve plus completely
independent first and second stages, all off a given tank, makes for
an acceptable level of redundancy.  Is this a fair statement?  Or do you
have bailout procedures with the gas mixes that you carry so that you
have redundancy?

Wrolf

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