Re: strength of vacuum

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com> 

Of course, what good's running a Tesla coil inside a
solid steel vessel?

"I know you can't see inside, but trust me, it's
sparkin' like mad!!!"

Adam


--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >
 > At 02:35 PM 10/31/2003 -0700, you wrote:
 > >Original poster: "Dr. Resonance"
 > <resonance-at-jvlnet-dot-com>
 > >
 > >The size of enclosure for TC parts in large high
 > vacu. would have so much
 > >surface area that the 15 PSI would probably crush
 > it.
 >
 > Nothing that a competent boiler manufacturer
 > couldn't make.  Big round
 > tanks with hemispherical ends can be easily
 > fabricated and will easily hold
 > vacuum.  The load's not all that high..  Say you
 > wanted a 6 foot diameter
 > chamber.  The hoop load would be 72 * 15 pounds per
 > linear inch of
 > chamber.. call it 1500 pounds.  If the chamber walls
 > were, say, 1/8" thick,
 > the stress would be 1500*8 psi, or 12000 psi, well
 > under the yield for
 > aluminum or steel.
 >   Naturally, you'd want a bit more sophisticated
 > design to account for
 > asymmetrical loads, etc.
 >
 > A bigger problem would be the surface finish and the
 > outgassing.  Large
 > chambers take a very long time to pump down (or a
 > very big/fast pump)
 > because of the large surface area.  I don't have my
 > Kurt J. Lesker catalog
 > handy here, but there's some rule of thumb about
 > outgassing rates per
 > square cm of area.
 >
 >