Review of TAPPI Constants in the Modernization of a Line Shaft Paper Machine to Sectional Electrics, TAPPICon22

For modernizing paper machine drive systems from line shaft mechanical to sectional electric drives, a well-documented set of constants called TAPPI constants are often utilized to provide power sizing recommendations based upon machine width, product mix and machine speed. 

TAPPI constants define sectional power requirements based upon a machine constant and individual sectional constants for specifying minimum electrical horsepower NRL and RDC needs for both wet end and dry and portions of a paper machine.  In 2016 a paper machine was modernized from a line shaft to sectional electrics by use of these TAPPI constants. 

After the paper machine was started up and commissioned in 2017, the author’s company project manager utilized a data logging computer system, which was part of the modernization package, to data log the performance of the paper machine post modernization and compared actual NRL data against the original NRL power predictions from TAPPI.  The purpose of this paper is to document how well the TAPPI constants did in modeling drive sectional horsepower requirements.  Sections reviewed are the wire turning roll, first press section, first dryer section, fourth dryer section, calender, and reel drum. 

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