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>Chris writes: > >> >This cannot be correct. When you fill on pressures the volume >> >of the tank is irrelevant. Imagine filling two independent tanks >> >simultaneously from two independent banks of gas. >> >The pressures in the two are identical. If you now hook >> >the two tanks up with a manifold and fill from one bank only >> >the mixes during the second fill are identical to that of the >> >first fill if the pressures "track" (and the temperatures >> >are kept the same). >> >> The basis of our math is MOLE volume based. >> Thus the true volume of the cylinder is VERY important. >> But, give or take 1/2 cubic inch, probably won't make a huge differance. > >Chris, > >Please tell me the true volume of a steel 104 that was hydro'd twice, >the first time having a 2.5% expansion, the second time with a 4% >expansion, at a fill pressure of 2640 psi. The 2.5% and 4% expansion >is well within the DOT limits of 10% each time. > >Next, please tell me what the expansion rates were on each and every >tank you own, or tell me how many people know the expansion rates for >a set of tanks they own? If I bought a 104 I'm assured it's a used >tank. I'm assured if it's current that it's been hydro'd at least >twice (once from manufacture, the second to keep it current). If I'm >smart I'd hydro it again before buying it to make sure it doesn't >fail. > >How am I, as joe consumer, supposed to know the expansion rates >during all of the hydro's over the tanks life? Or does this not >matter? > >Ken >-- >-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >Ken Sallot "High ppO2's can be hazardous to your health" >CIRCA - Ronnie Bell >(904) 392-2007 >kens@uf*.ed* >http://grove.ufl.edu/~ken >-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > I am not at all certain is there is "way" for you to know this without measuring the cylinder. the question is, by what amount do internal volumes actually vary following a Hydro and or a tumble? Christopher M. Parrett, President, Abysmal Diving Inc. Makers of ABYSS, Advanced Dive Planning Software. 6595 Odell Place, Suite G. Boulder CO, 80301 Ph, 303-530-7248, Fx, 303-530-2808 ftp://abysmal.com/users/abysmal http://www.emi.net/gulfstream/abyss/abyss.html
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