Vacuum Pumps. Basics. vac·u·um noun 1. a space entirely devoid of matter.
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Oil Sealed Rotary Pumps Understanding Gas Ballastwww2.avs.org/chapters/nccavs/pdf/Gas_Ballast_OilSealedPumps.pdf
Condensation of vapor in the gas mixture is a problem with these pumps. Solution Ballasting
Works by increasing the gas/vapor ratio (air is mostly gas)
As you might imagine this interferes with the final vacuum
Slower 400-600 RPM
Faster 1500 to 1725 RPM
Spec sheet for an
RV rotary vane pump
Subset of specs for Edwards EXT 556H turbomolecular pump
Pump speed lower at low vacuum
Turbo pumps: opposite
Turbo molecular pump TPH 240