🚀 go-pugleaf

nkumar@bobcat.ent.ohiou.edu (Naresh Kumar CHE Grad) writes:
: 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.
: >: 
     [original stuff deleted] 
     [equation deleted]
: >    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.
: 
: Why do you think that a vessel of 12" ID cannot have a wall thickness
: of 10" ?
[more stuff deleted]
: 
: naresh

Well, I didn't explain things properly.  That was a 12 inch _OD_, not ID.
Also, that particular equation is only valid for thin wall vessels.
I don't have the correct equations for thick wall vessels.  Even if one 
was ALLOWED to build such a tank it would weigh about 3600 kg (1 m long,
12" ID, 10" wall thickness).  I don't think it is feasible.

                                  | 
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                 | 
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