🚀 go-pugleaf

In article <1992Nov11.154205.243@kakwa.ucs.ualberta.ca> kdorma@ravana.eche.ualberta.ca (Kevin Dorma) writes:
>01crmeyer@leo.bsuvc.bsu.edu (Craig Meyer) writes:
>: I'm looking into the concept of running an automobile off of compressed air.
>: 
>: According to my calculations (based on a Gast airmotor catalogue), such a
>: vehicle would need air tanks that could hold 100,000 psi.
>: 
>: Is that at all possible?
>: 
>: Thanks for your help,
>:                     
>: CM 
>: 
>: -- 
>:        Craig Meyer                 01CRMEYER@LEO.BSUVC.BSU.EDU
>:        Indiana Academy for Science, Mathematics, and Humaities.
>:        Muncie, IN  47306                          317-285-7433
>: 
>:        Opinions expressed are mine alone, and not necessarily
>:        shared by the Indiana Academy.
>
>
>Here are some rough calculations I did.  Using the equation for wall
>thickness (ASME Boiler and Pressure Vessel Code)
>
>    t_m = ____ P*D_____               from Perry, 5th ed, 6-42             
>          2*(S*E + P*Y)
>
>    t_m  wall thickness
>
>    P = 100 000 psi         pressure
>    D = 12 inch             conceivable vessel diameter
>    S = 20 000 psi          typical allowable stress for steels
>    E = 1.0                 weld joint factor
>    Y = 0.4                 coefficient for ductile, ferrous metals
>
>Plug in the numbers and you get t_m = 10 inch.
>
>Not possible.  Sorry.
>
>                                  | 
>Kevin Dorma                       | Hi, my Lyapunov exponent is 2.31.
>kdorma@ravana.eche.ualberta.ca    | What's yours?
>Ph.D. type of student             | 
>Dept. of Chemical Engineering     | Don't look at my disclaimer, your's
>University of Alberta             | is much more interesting.
>Edmonton, Alberta                 | 
>                                  |
>
> 

Why do you think that a vessel of 12" ID cannot have a wall thickness
of 10" ?
I think that the major problem would be to compress the air to a 
pressure of 100 000 psi unless you store liauified air and then heat
it.  I wonder if this is going to be used as a rocket.

ciao

naresh