A Study of Efficiency Corrections for Centrifugal Pumps Handling Viscous Liquids in ISO/TR 17766:2005

Abstract

Pump efficiency correction equations for converting from water to viscous liquids have been established for the turbulent-flow and laminar-flow regions. However, the two equations are discontinuous in the transient-flow region. This paper proposes a new equation for the transient-flow region that is based on fluid-dynamical considerations. Moreover, an alternative equation is examined for the turbulent-flow region that avoids an underestimate caused by the current efficiency correction equation that was adopted in ISO/TR 17766.