When to use a Positive Displacement Pump
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چکیده
Flow rate versus viscosity Another major difference between the pump types is the effect viscosity has on the capacity of the pump. You will notice in the flow r loses flow as the viscosity goes up but the PD pump’s flow actually increases. This is because the higher viscosity liquids fill the clearances of the pump causing a higher volumetric efficiency. Remember, this chart shows effect of viscosity on the pump flow; when there is a viscosity change there is also greater lin loss in the system. This means you will also have to calculate the change in pump flow from the first chart for this pressure change. Flow Rate
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