Posted by Teresa on
URL: https://www.shado-forum.com/UFO-Space-Suit-question-tp1491104p1491111.html

--- In [hidden email], "Paul Bowers" <pbowers@p...> wrote:
> Could be LOX (liquefied O2).

Sounds possible, given a good compact chiller/heater system for
storage and recovery.

>
> 5 PSI? Aren't SCUBA tanks higher pressure than that? Typical HP
> compressed gas cylinders are rated for up to 6000 PSIG. 2"
> diameter x 12" long holds about 54 litres at 1800 PSIG (Someone
> else will have to figure out how long that volume of gas would
> last) and weighs 3.5 pounds.

Actually, I meant 5 PSI as the *suit* pressure (as was used in the US
Gemini and Apollo spacesuits). Now figure 54L 1800 PSIG of pure oxygen
regulated to 5 PSI suit pressure and breathed off at that pressure.
Anyone care to venture a guess? I'll try do do some figuring after
work.

By comparison, my SCUBA tanks are 80 cu. ft. aluminum, rated at 3000
PSIG. The difference is that I breathe off the air at anywhere from 1
to 4 atm depending upon my depth. I can stay down approx an hour & 1/2
in shallow water (~20 ft) using about 1500-2000 PSIG of the air in the
tank (depending on exertion). But my tanks are huge, as compared to
me. With a tank on my back I cannot sit down because the tank is
significantly longer than my torso (I'm 5'2"). But I digress.....

Happy Figuring,
Teresa