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Pumping high viscosity liquids9/17/2023 ![]() ![]() ANSI/HI 9.6.7 was used to correct the performance as shown in Image 6. The viscous data should be corrected from the water performance test per Hydraulic Institute standard ANSI/HI 9.6.7 Effects of Liquid Viscosity on Rotodynamic Pump Performance. The performance curve in Image 6 shows the water performance and the corrected viscous performance for the application liquid, which has a viscosity of 1,000 SSU and specific gravity of 0.9. A marked increase in input power due to reduced efficiency and a reduction in head and rate of flow occurs with viscous liquids compared to water. The performance of a centrifugal pump is affected when handling viscous liquids because of the increased friction when the impeller rotates and the resistance to flow compared to water test. It is industry standard to test the performance of centrifugal pumps with clear water per ANSI/HI 14.6 Rotodynamic pumps for Hydraulic Performance Tests. Rotary (screw) pump Centrifugal Pump Viscous Pumping Considerations As your centrifugal pump supplier in Canada, our experts are on hand to help you choose, install, maintain, and monitor a variety of equipment, whether it’s positive displacement, centrifugal or other.Image 5. The pump you choose should help your system perform at peak efficiency, not reduce its performance. Positive displacement pumps can run at lower speeds and at lower shear rates than centrifugal pumps. When a PD pump handles higher viscosity fluids, flow rates increase as the high viscosity liquid fills the pump’s clearances – increasing efficiency. When to choose a positive displacement pump insteadįor highly viscous fluids, a better option might be a positive displacement pump. We’ve seen centrifugal pumps manage viscosities of up to 1000 cP, but this impacts the performance of the pump. The higher the viscosity, the less efficient the pump will be. Here’s two things to consider:Ī centrifugal pump shaft has a torque and horsepower limit that will be negatively impacted as viscosity increases. If your application is above 250, we suggest working with your pump manufacturer (or your centrifugal pumps supplier in Canada) to see if a centrifugal pump would be correct for the pumped fluid. What viscosity can a centrifugal pump handle?ĭepending on size of the pump and geometry of the impeller, viscosity limits range from 100 to 700 cP in most centrifugal pumps in Canada.
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