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>	Whoooaaa! Major brain bend - wrt ambient pressure exceeding
>interstage pressure (c/o Rich P);
>
>	Since the first stage is 'balanced' to ambient pressure by its
>diaphragm or piston, why, isn't the interstage pressure 8-12 bar *above
>ambient*?

Yes, you're right _except_

Almost everyone I know advocates turning off the valve at the tank.  
Given that, there's no way for the regulator first stage to boost the 
interstage pressure as you descend.  The starting interstage pressure is 
all that's there is.  Thus, should someone descend to 80 metres (roughly) 
the interstage pressure will be equivalent to ambient (again, roughly).


        -- 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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