Vacuum sources

  • Thread starter GiTS
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  • #1
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  • #2
Q_Goest
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Hi GiTS. I really don't think that will work. Even if modified to reduce piston ring leakage, it's only a single stage, so I doubt it would get below ~2 psia assuming it was properly modified. But modifying that is going to be more expensive than just getting a real vacuum pump.

Try ebay or Craigslist. A used one can be picked up for about $50 from what I've seen.
 
  • #3
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I don't want to turn the compressor into a vac. I want to hook the output up to a compressed air powered aspirator. But I don't know how much horsepower I need to get the aspirator to pull 10 Torr.
 
  • #4
negitron
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I should think the specs of the aspirator would tell you.
 
  • #6
negitron
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Incidentally, 10 Torr is well within the capabilities of a single-stage rotary vane pump, of the type used by HVAC repairmen. I have one I use for various nefarious vacuum-related experiments.
 
  • #7
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thanks for the tip. I think this might be perfect
http://cgi.ebay.com/Rotary-Vane-Vacuum-Pump-29%22Hg-3-CFM-1%2f4-HP-AC-HVAC-Tool_W0QQitemZ390068911886QQcmdZViewItem [Broken]
 
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  • #8
MATLABdude
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29 in-Hg of vacuum works out to 736 Torr below atmospheric (which is nominally 760, depending on where you live / work).

May want to make sure your glassware can handle that without imploding (assuming that you in fact reach the ultimate pressure of the pump).
 
  • #9
  • #10
negitron
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You need one more like this one:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390066833029 [Broken]
 
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