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what is the formula to calculate specific speed. N s specific speed. Q is the Volume Flow rate of the pump at its best efficiency point BEP in gpm.
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In SI units the formula can be used as. The formula for average speed also called average velocity in physics and engineering is. Q flow m3h.
The formula for specific speed N s of a turbine rotating at a speed of N rpm that develops the power of P kW at the heat of H m is given by N s N P x H 54.
Values are taken at best efficiency point BEP. Q flow gpm. Velocity insec pk to mils pk Centrifugal Pumps Specific speed US. In the speed calculator the default is miles per hour but you can change the unit to suit your needs.
