Viscosity is an important property of fluids that determines their resistance to flow. It can be measured in different ways, such as dynamic viscosity (often referred to as "viscosity") and kinematic viscosity. Another common method is the Saybolt viscosity, which is measured using a viscometer. The unit conversion between these measurements is as follows: 1 Pa·s = 1000 mPa·s = 1000 centipoise (cP), and 1 mm²/s = 1 cSt. For Saybolt units, SSU (Saybolt Seconds Universal) is used for medium-viscosity liquids, while SSF (Saybolt Seconds Furol) is used for high-viscosity liquids. For viscosities above 70 cSt, the relationship is: 1 cSt = 0.216 SSU, and 1 SSU = 10 SSF.
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The viscosity of a liquid significantly affects pump performance. For example, with vane pumps, as the fluid's viscosity increases, the flow rate, head lift, and power consumption all tend to rise. In positive displacement pumps, higher viscosity usually reduces internal leakage, improves volumetric efficiency, and increases the actual flow output. However, overall efficiency may decrease, and power consumption tends to go up as well.
Different types of pumps are suitable for various viscosity ranges. You can refer to the table provided for more details on the applicable viscosity range for each pump type. If you need further assistance or have specific requirements, please contact us today. We’re here to help you find the right solution for your application.
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