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Hi Don, I really appreciate your putting out the analysis of how long it might take to empty a tank due to a free flow at depth and requesting comments. There is indeed a part of the problem for which I'd appreciate some further words. You said << Your 1st stage regulator keeps the intermediate pressure to your 2nd stage at ~150 PSI above the surrounding pressure and the freeflow rate is a function of the intermediate pressure. For example if you are at 330 ft (~100M), the pressure increase from the surface was 147PSI (10 bar) and the intermediate pressure in your hose is about 150+147 = 297 PSI or roughly double. At this depth, you would lose gas to a freeflow approximately twice as fast as at the surface. >> I certainly agree that the intermediate pressure for most regulators is around 140 psi above ambient, but (and I may be showing my own ignorance here,) it is not clear to me why the rate of the freeflow is a (directly proportional?) function of the [intermediate pressure + hydrostatic pressure at depth] as you have asserted in your analysis. I may be just missing something very simple, so I'd appreciate your elaborating on where this relationship comes from. It is just not clear to me how to get it. Thanks a bunch for your help. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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