Re: vac pumps

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

Original poster: "marc metlicka by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>



Tesla list wrote:
> 
> Original poster: "Kristian Ukkonen by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <kristian.ukkonen-at-iki.fi>
> 
> Sorry, but the descriptions below are somewhat flawed.
> 
> A good (for example, rotary vane) fore pump (mechanical pump) will
> pump down to about 1 mTorr.
> 
> A normal refrigerator compressor will pump down to around dozens of
> Torr, perhaps to 25 Torr.  That is a piston pump.
> 
> A diffusion pump will pump decades lower, < 1e-5 torr. Still, there
> is (relatively) LOTS of stuff left at 1e-5 or 1e-10, when one looks
> at the number of molecules hitting each mm2 of the vacuum vessel walls.
> 
>   Kristian Ukkonen.
> 
> btw: The Sterling-Sihi homepage :
> http://www.sterlingfluidsystems-dot-com/
> Based on quick browse, you propably have liquid-ring pump..

Thank you kristian,
Yes it is a liquid ring pump of the sterling LEM variety. on the home
page it says the best it cab draw is -4 torr? I'm very new to this whole
vacuum technology so have much to learn. I think i will keep two for
myself and sell the other four on ebay? I was hoping i could get a nice
plasma globe vacuum or at least some good cap vacuums?
Thanks to all that have, and will help me on this mystery,
Marc M.


> NOT a good choise for a vacuum pump for most applications.
> But ask for a manual from the company..
> 
> Tesla list wrote:
> >
> > Original poster: "Mike by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <arcsnsparks-at-parlorcity-dot-com>
> >
> > Sounds like a "roughing pump" which is used to pump out most of the air
from
> > a system before an oil or mercury diffusion pump is used to remove the last
> > bit. . yes they are useful and I'm sure you can sell all of them you
can get
> > on Ebay
> >
> > -----Original Message-----
> > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > Sent: Tuesday, April 09, 2002 10:29 PM
> > To: tesla-at-pupman-dot-com
> > Subject: Re: vac pumps
> >
> > Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <bigfoo39-at-telocity-dot-com>
> >
> > Tesla list wrote:
> >
> > >Original poster: "marc metlicka by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
> > >
> > >Hello All,
> > >I have access to several "sterling SIHI" VACUUM PUMPS. fROM WHAT I
> > >GATHER, THEY USE A FLUID PUMPED THROUGH THE SYSTEM IN ORDER TO CREATE
> > >THE VACUUM?
> > > Product statements for the model lema 40 is 25 torr.
> > >Is any coilers familier with this type of unit? should i keep two for a
> > >"great" vacuum sytem?
> > >Thank you,
> > >Marc M.
> > >
> > >
> > >
> > >
> > >
> > Hi Marc...
> >
> > 25 torr is pretty low as far as a diecent vacuum goes...
> > the systems sound like they might be the rotory vane type
> >
> > there is the oil diffusion type but they can go as low as "milli torr"
> >
> > I'll bet if you put one on Ebay it will sell for nearly 100$
> >
> > I'd keep at least 2 for myself if I had several in my posession ;)
> >
> > Scot D