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+//Fluid Systems - By - Shiv Kumar
+//Chapter 11- Centrifugal Pumps
+//Example 11.15
+//To Determine Minimum Starting Speed of the Pump.
+
+       clc
+        clear
+
+//Given Data:-
+         Di=300;       //Diameter of Impeller at Inlet, mm
+         Do=600;        //Diameter of the Impeller at Outlet, mm
+         Vfo=2.6;       //Velocity of Flow at Outlet, m/s
+         beta_o=42;         //Vane Angle at outlet, degrees
+         eta_man=65/100;        //Manomwtric Efficiency, m^2
+
+
+//Computations:-
+       Di=Di/1000;           //m
+       Do=Do/1000;         //m
+    
+      uo_by_N=%pi*Do/60;      // uo/N
+            
+     //Minimum Starting Speed of The Centrifugal Pump, Nmin 
+         Nmin=(120*Do*eta_man*Vfo/(tand(beta_o)*%pi*(Do^2-Di^2)))/(120*eta_man*Do*uo_by_N/(%pi*(Do^2-Di^2))-1);       //rpm 
+            
+
+
+//Results:-
+      printf("The Minimum Starting Speed of the Centrifugal Pump, Nmin =%.2f rpm \n",Nmin )  //The answer vary due to round off error
+
+