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Hydraulic Institute Updates Viscosity Correction Standard

ANSI/HI 9.6.7 - 2010 applies to single stage and multistage rotodynamic (centrifugal and vertical) pumps having radial impellers ns = 60, (Ns = 3000), handling liquids exhibiting Newtonian behavior, and a kinematic viscosity greater than 1 and less than 4000 centistokes.

Major improvements of the 2010 version of the standard compared to the 2004 version include refined mathematics for better results throughout, editorial changes for easier reading and increased educational content and figures showing characteristics when pumping viscous liquids have been clarified for improved accuracy.  The upper limit of the flow range has also been increased to 410 m3/h (1800 gpm) in the updated standard.

“The classical version of viscosity correction that was developed years ago by the Hydraulic Institute relied on interpolation using correction curves and nomographs.  This updated version of the viscosity correction provides a mathematical solution that eliminates the potential error created by interpolation”, explained Gregg Romanyshyn, Technical Director of HI.

Tom Angle, formerly of Weir Specialty Pump and Michael Coussens, Peerless Pumps Company, led the committee that developed the standard.  Committee members also included representatives from:  Sulzer Pumps (US) Inc.; CLYDEUNION; Intelliquip, LLC; ekwestral corp.; National Pump Company, LLC; Pentair Water; IMO Pump - Colfax; ITT - Residential & Commercial Water; Weir Minerals North America; and Weir Floway, Inc.

HI Pump Standards are reliable, widely accepted references for anyone involved in pumps, including users, consultants, contractors, construction firms, manufacturers of pumps, seals, motors, instrumentation, controls, and pump software developers and systems integrators.  HI periodically introduces new Standards based on industry needs.  HI’s complete library of ANSI/HI standards for the pump industry is user-friendly, and available in both electronic and print formats at the HI e-Store:, or by calling the Hydraulic Institute’s purchasing line at: 973. 267. 9700 Ext 118.

About the Hydraulic Institute:  The Hydraulic Institute is the largest association of pump producers and suppliers to the pump industry in North America and a global authority on pumps and pumping systems.  Its mission is to serve as a forum for the exchange of industry information, while providing value-added services to member companies and pump users worldwide.  For more information about the Hydraulic Institute, its member companies and Standards Partners visit and

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