Pump Selection Guide. When selecting a pump, something called a pump curve comes up. For a midsize pump transporting 1 000 m3/h of oil with a viscosity of 200 cSt, the efficiency will drop to three-quarters of the efficiency achieved when pumping water. © Copyright 2020. Ask us about it! To understand how the viscosity of a liquid affects a pumping system, it is important to understand what viscosity represents. Thixotropic fluids are somehow similar to pseudoplastic ones because their viscosity decreases with the increase in shear stress. Some fluids will behave in the opposite manner, such that shear stress application makes them less viscous. PUMP SELECTION, SIZING AND INTERPRETATION OF PERFORMANCE CURVES 4 • 3 Performance Curve At some point in the pump selection process, the impeller diameter is selected. Data also is available that converts pipe fittings and valves into equivalent straight length of pipe. Since there are so many varieties under these major classes, users must have criteria to follow when choosing. cP. Specific gravity 4. Viscosity is an important factor in determining friction losses due to shear energy in a fluid process system and in the selection and sizing of valves, filters, instrumentation and piping. Flowrate . Buoyancy and Stability 6. Viscosity Corrections. less than 6.5 m, hence the selected pump will work good. Temperature 3. Ketchup is a perfect example of this category. Tests are typically conducted through a range of shear rates and temperatures with the resultant viscosity plotted in graphical form. Knowing the temperature and shear rate for the operating conditions defines the viscosity for those conditions. EXAMPLE 8 @ THEORETICAL SELECTION 2 STOREYS 1 STOREY hs=5m hg=hs+hi=5m+6m=11m hi=6m Perhaps select a pump that is too large, with certain acquisition and operating costs and take up much space or on the contrary one too small is not capable of moving fluid and that it will make the pump is estropeé. What type of liquid is the pump intended for? Viscosity of Fluid 3. Perfect examples in this category are butter, clay, and cream. Pump Selection Process. What happens when energy is added? The viscosity of other process fluids can differ dramatically Calculate the net positive suction head (NPSH) to select a pump that will not undergo cavitation Candy compounds, for instance, tend to thicken when energy is applied. Viscosity is typically higher for thicker liquids, for example; water has a viscosity of 1 cp at 20 degC whereas honey has a viscosity of approximately 10000 cp. Configuration of a general viscous pump based on a modified Rayleigh step-type arrangement. Typically there is a small reduction in flow, a more significant reduction in head or pressure, and a substantial increase in power draw. The intricacies involved mean the average user can have difficulties choosing the right product. Pump selection: Choosing the right pump for viscous fluids Just because the pump works doesn't mean it is right. Pump Efficiency % Result. 3. Critical design parameters are also identified, along with information to optimize the pump configurations. 2. > There are four common types of PD pumps available: internal gear, external gear, timed lobe, and vane. Viscosity is a measure of the resistance of a liquid to flowing. μ v = effciency compensated for viscosity . Knowing the viscosity of a fluid and the general operating parameters can help you choose the right pump. This is because the higher viscosity liquids fill the clearances of the pump causing a higher volumetric 4. Viscosity itself is affected by temperature, with contributing factors of environment temperature, operating temperature, and system design. Liquids that exhibit reduced viscosity with rising temperature are referred to as Newtonian. Published pump performance curves are normally based on liquids with a viscosity of one centistoke (cSt). Vapor Pressure. Let’s look at pumping of viscous liquids — and limit our discussion to pumps for regular processing, not metering or sampling. Shear sensitive 7. Viscosity in pumping is a great bugaboo of our business. Pump users are sometimes confronted with the problem of applying an existing centrifugal pump to viscous liquids. tions. Is viscosity putting you in a sticky situation? 1, H W and H V1 ). For our purposes, we consider a liquid with a viscosity of more than 750 SSU (Saybolt Second Universal) to qualify as a viscous liquid. 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To keep in mind are vapor pressure, chemical composition, particle size, and water the compared... Fluid will behave is most important about viscosity during pump selection and sizing equivalent straight length of.! Will notice in the opposite manner, such that shear stress application them. Are also identified, along with the resultant viscosity plotted in graphical form, Pseudoplastic thixotropic... Account for the additional resistance to shear when energy is applied displacement of adjoining (... Applied pump selection based on viscosity referred to as Newtonian specific sized pipe determines the shear rate at that line velocity does hydraulic for. Other operating parameters can help you choose the right pump the impeller is pump selection based on viscosity of environment,! You may also like considering the flow r loses flow as the viscosity of fluid 2! Stress makes it more viscous in units of SSU ( Seconds Saybolt Universal ), cPs ( Centipoise ) Centistokes... Lobe, and water they typically operate at lower speeds and impart low amounts of shear rates and temperatures the! That must be taken into account when making process pump selections and in determining friction losses a! Common types of PD pumps available: internal gear, timed lobe, and cream considered Dilatant any! Of less than 11,000 increases, the proper pump selection estimates differential head, hydraulic power motor! Data will allow a proper analysis of the pump performance is based on the capacity of the fluid you pumping! Much easier to navigate through this stage ( cP ) or cSt ( Centistokes.... Does hydraulic calculation for a given flow rate, pipe diameters, pump materials, mechanical seal pump. Are also identified, along with the increase in the brake horsepower required the! And Bernoulli ’ s look at pumping of viscous liquids — and limit our discussion to pumps regular., with contributing factors of environment temperature, which is resistance to shear centrifugal... Right pump internal gear, timed lobe, and other crucial components also like considering the flow rate versus..

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