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RE: [PSUBS-MAILIST] Reverse engineering
Uh-Oh,
this is the famous plastic coke bottle question again. Take one of those and
fill it with compressed air, and you will find it withstands hundreds of psi.
But take it underwater with you on a scuba dive (external pressure) and it will
collapse before you know it. External pressure resistance is NOT calculated from
internal pressure resistance. They are two entirely different
things.
I'm
afraid the "formula" for external pressure is actually a number of pages worth,
because it depends on lots of variables like diameters, length, material, etc.,
etc. You can readily calculate the depth rating of cylinders and speres, but
anything else is hard. I'll send you scans of all the formulas off
list, and the spreadsheet on PSUBS automates the same
calculations.
"Reverse engineering" is something quite different. That refers to taking
something apart and creating the design from the finished product, rather than
building a product from a design. When I was an engineering student in
Argentina, one of my colleagues worked at a tank factory. His assignment was to
take the fire control circuitry from a Leopard II tank (purchased from Germany)
and figure out the design so replicas could be built without paying the
royalties.
cheers,
-
Alec
Question.....
What is the formula to calculate reverse engineering on a pressure hull
?
If a Co2 tank is rated for say 1000 PSI of outward pressure
from the inside, what would it be rated for as far as pressure from the
outside ? Sorry if this sounds like a dumb question, Im not sure if there is a
calculation for this....
Tom