Transcription of Variable Frequency Drives for a Vacuum Pump …
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Variable Frequency Drives for a Vacuum Pump …
First published in pumps and Systems Magazine, January 1998 Variable FrequencyDrives for a Vacuum Pump SystemBy Kevin Skelton, Graham Corporation_____Editor s Note: Responding to requests fromreaders many of whom work with vacuumpumping systems pumps and Systems isintroducing this new column with theJanuary issue. Look for it periodically. In many process plant applications, usinga Variable Frequency drive (VFD) tocontrol the capacity of a liquid ringvacuum pump (LRVP) is an system designs consisted ofsizing the LRVP to operate efficiently for acertain portion of the process cycle andthen using a recycle control valve systemto maintain the desired LRVP suctionpressure. This usually meant a loss ofsystem efficiency for most of theoperation liquid ring pump can be used in vesselevacuation or batch processes where theload volume is high at startup anddiminishes as the vessel is emptied andthe subsequent Vacuum level the end of the cycle the usual intent isto hold as high a Vacuum level as possiblefor a given period of time.
First published in Pumps and Systems Magazine, January 1998 Variable Frequency Drives for a Vacuum Pump System By Kevin Skelton, Graham Corporation
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