PUMP HANDBOOK 4ED 0004 Edition from Ĭentrifugal Pump Design from Flipkart. PERRY’S CHEMICAL ENGINEERS’ HANDBOOK,8/ED from Mixed flow type of impeller is selected when the pump specific speed falls between 4200 to 9000.įind it Interesting? Learn more about Centrifugal Pump in our website and Dont miss our Pump Quiz In mixed flow design, part of head is developed by centrifugal action and part of head is developed by impeller design. In Mixed flow type impellers fluid leaves at an angle below 45 degree from the shaft center line. Axial Flow type of impeller is selected when the specific speed is greater than 9000 Mixed Flow Impellers In axial flow type impellers fluid enters and leaves along the same direction parallel to the rotating shaft centerline giving high flow rate and low head. Radial flow type of impeller is selected when the pump specific speed is between 500 to 4200. In radial flow type impellers fluid leaves perpendicular to the pump shaft center line giving high head and low flow rate. Radial flow impellers develop head with centrifugal action. Application of Pump Specific Speedīased on suction specific speed impellers are selected from the following three types Per stage pump head to be used in calculations. While calculating specific speed use flow rate and discharge head at its best efficiency point.įor Double suction pumps use half of the volume flow rate at BEP while calculating specific speed. H is Discharge head of the pump at BEP in m Q is the Volume Flow rate of the pump at its best efficiency point – BEP in m 3/hr Ns is Specific speed of the pump Dimensionless H is Discharge head of the pump at BEP in ft Q is the Volume Flow rate of the pump at its best efficiency point – BEP in gpm N s is Specific speed of the pump Dimensionless Specific speed of the pump is calculated with the help of the formula: Ace your Fluid Mechanics and Turbomachinery preparations for Pumps with us and. Specific speed for the turbine is given by: N s N P H 5 4. Formula for Calculation of Pump Specific Speed The specific speed (Ns) of a turbine is defined as, the speed of a geometrically similar Turbine that would develop unit Power (P) when working under a unit Head (H) (1 m head). Specific speed is used to find out the geometry of the impellers and it is helpful in identifying the type of impeller to be selected for particular application. Pump Specific speed is a dimensionless number used in design.
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