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Wednesday, July 17, 2019 5:23:21 PM
As far as PD pumps...here some info that pretty much spells it out.
“Another major difference between the pump types is the effect viscosity has on the capacity of the pump. You will notice in the flow rate chart how the centrifugal pump 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 only the effect of viscosity on the pump flow; when there is a viscosity change there is also greater line 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.”
So higher viscosity liquids have “increased” flow over centrifugal pumps in positive displacement pumps! No pumping station moving crude in volume at turbulent flows are using this type of pumping system. It’s all
meaningless especially since RMOTC was paid for their testing and did not continue or authorize further studies and promptly closed up shop soon after...but we all are to believe it was an astounding success!
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