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On Thu, 21 Sep 1995, Kevin-Neil Klop wrote: > > 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). Provided that you are using a kit that has absolutely no leaks from the high pressure side to ambient. You seated your first stage against the O-Ring perfectly, and, of course, you aren't using a Sherwood reg which has that built-in HP leak. And the reg doesn't purge as you jump into the water, which I'd suspect that it almost certainly will if you do a typical boat entry as opposed to walking in to calm water from the shore.. Me? I use a Sherwood, and I leave the valve turned on. Nick Simicich - njs@sc*.em*.ne* - (last choice) njs@bc*.vn*.ib*.co* http://scifi.emi.net/njs.html -- Stop by and Light Up The World!
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