Transcription of Choose the Right Vacuum Pump - Graham Corporation
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Choose the Right Vacuum Pump - Graham Corporation
Choose the Right Vacuum PumpJoe Aliasso, Graham CorporationReprinted from CHEMICAL ENGINEERING, March 1999, copyright 1999 by the McGrawHill Companies with all rights reprints may be ordered by calling Chemical Engineering Reprint Department (212) need to operate under Vacuum iswidespread throughout the chemical processindustries (CPI). Distillation, drying, flashcooling, stripping, and evaporation are amongthe unit operations that frequently take placeat less than atmospheric many process applications, the overridingconsideration is the amount of Vacuum (ordegree of evacuation) required. Of the fivemajor types of Vacuum producing devicesdiscussed here, the ejector can achieve thegreatest degree of evacuation: down to 5micrometers of Hg absolute. Dry pumps androtary piston pumps can each evacuate to 10micrometers Hg; once-through oil pumps canreach 500 micrometers Hg; and liquid ringpumps can go down to 10 mm from its Vacuum producing ability, eachof the five types has its own set of attractionsand drawbacks.
These pumps work by either of two mechanisms, volumetric reduction or the mixing of lower-pressure gas with higher-pressure discharge gas (as in a Roots blower).
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