On Fri, 6 Apr 2001, Rush wrote:
>
> There was a company selling portable _liquid_ nitrogen tanks for the
> purpose of providing onsite compressed gas. Supposed to have hours and
> hours of air wrench capacity. I can't find the website right now, but a
> little searching should hunt them out.
There are people that use liquid C02 to run air tools and such like. Liquid
CO2 provides about 8 cubic foot per liquid pound, so a 20lb tank (about
6-8" diamter and 3' tall, the size you see at bars and restraunts is only
160 scf. A 50 lb tank, the bi ggest commonly available, is only 400 cf.
Liquid nitorgen is more effecient, but not by much, more exxpensive, harder
to get, and not maintance free.
>
> > Hmmm, typical impact uses maybe 4 cfm @ 7 atmospheres (90 psi gage), so 3
> > hours would be 3*60*4*7 = 5040 scf. A little web surfing turns up that a
> > common "type 49" nitrogen cylinder contains 304 scf. Even ignoring the
> > "tare" gas left in the cylinder when it's pressure drops to 90psi, you're
> > sure going to need a lot of them ...
> >
> > Randall
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