At 04:12 PM 6/6/2002, you 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). > >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)!
I've suggested high pressure LN2 a few times in the past for various people, but so far nobody's tried it. You can transport it to the site at low pressure by keeping it in a dewar bottle. For the high-pressure bottle, you have a small jacketed bottle. You vent some LN2 around the outside to keep it cold and you fill it with liquid. By controlling the temperature you get any pressure you want. A safety valve isn't that big a problem since the high-pressure bottle will only have a small amount in it and NO water to freeze up the valve. ---------- Jerry Durand Durand Interstellar, Inc. 219 Oak Wood Way Los Gatos, California 95032-2523 USA tel: +1 408 356-3886 fax: +1 408 356-4659 web: www.interstellar.com _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
