Henry Spencer <[EMAIL PROTECTED]> wrote: >On Thu, 6 Jun 2002, David Weinshenker wrote: > > Hmmm.... IIRC, the liquid density of cryo gases such as nitrogen and > > oxygen is about 1000 times their gas density at 1 atm. ... so if LN2 > > were sealed in a full tank and then allowed to warm to ambient, the > > tank would then contain gaseous nitrogen at about 1000 atm. (15000 psi). > >Alternatively, if the tank starts out 1/3 full you get circa 5000psi. >(Well, those pressures are high enough that you'd want to use something >more accurate than the ideal-gas law to calculate the results, but that's >an unimportant detail unless/until you start making serious plans.) > > > Of course, in order to use this process as a safe source of high- > > pressure gas, one would need valves and tankage that would withstand > > this pressure with a reasonable safety factor (over the entire >temperature > > range in question - which would require materials not subject to >low-temp > > embrittlement)! We will need to monitor the pressure AND temperature of the fill gas. The fill gas will adiabatically cool. If we fill to the desired pressure, then, as the gas warms, it will overpressure.
Tony Fredericks Amateur Rocket Scientist ERPS Member _________________________________________________________________ Join the world�s largest e-mail service with MSN Hotmail. http://www.hotmail.com _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
