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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 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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