The 1997 edition of the ANSI/HI standard on allowable operating region for centrifugal and vertical pumps has been updated by the Hydraulic Institute, Parsippany, N.J. The organization published ANSI/HI 9.6.3,2012 Rotodynamic (Centrifugal and Vertical) Pumps – Guideline for Allowable Operating Region , to delineate the changes.
updated guideline discusses the effects of operating a rotodynamic pump at rates
of flow greater than or less than the rate of flow at the pump’s best
efficiency point (BEP). These effects influence the power consumption and life
of pump components; therefore, considering the operating rate of flow is
essential to reliable, efficient pump operation.
preferred operating region (POR) and the allowable operating region (AOR) are
defined for rotodynamic pump types and related to specific speed. Factors that
affect AOR are discussed and NPSH margin vs. rate of flow is presented.
guideline also indicates when stable or unstable operation may be expected
based on typical system head curves, for pumps exhibiting a drooping head curve
or a head curve with a dip..
guideline is available for purchase at the HI eStore for $65 and is available
in both hardcopy and pdf formats.
Hydraulic Institute Updates Rotodynamic Pumps Guideline
July 26, 2012