TITLE

Speed manages streams

AUTHOR(S)
Gibson, Ian; Irvine, Geoff
PUB. DATE
July 2004
SOURCE
InTech;Jul2004, Vol. 51 Issue 7, p33
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
This article discusses the concept of using variable frequency (VF) drives to control electric-driven centrifugal pumps. Some of the advantages of using VF drives on electric motors are energy savings, efficiency, power factor, installation, specification, ability to control, maintenance, fugitive emissions, and reduced wear on the bearings and seals of the pumps. Discharge throttling is widely applied in the petroleum industry. It involves putting a control valve on the discharge side. The speed control method of flow control ensures that just enough energy goes to the pump to get the desired flow rate. The most common method of controlling the frequency is pulse width modulation. Direct on line starting a pump may cause water hammer effects, as this method makes no attempt to soft start the pump. Cavitation is a phenomenon that occurs whenever the static pressure drops below the liquid vapor pressure. Reducing the speed of a pump reduces the wear on the seals and bearings of the pump. This is verifiable by examining the reliability index of a pump manufacturer. Where digital communications are communicating speed reference signals and configuration data to the drive, it brings benefits to the overall operation of the plant.
ACCESSION #
13934014

 

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