Net Positive Suction Head

Fluid Flow CENTRIFUGAL PUMPS Head H_p 2 H_P 1 � � � � � � � � n₂ n₁ 2 48 ft^� � � � � � 3600 rpm 1800 rpm 2 192 ft Power P₂ P₁ � � � � � � � � n₂ n₁ 3 45 kW^� � � � � � 3600 rpm 1800 rpm 3 360 kW It is possible to develop the characteristic curve for the new speed of a pump based on the curve for its original speed. The technique is to take several points on the original curve and apply the pump laws to determine the new head and flow at the new speed. The pump head versus flow rate curve that results from a change in pump speed is graphically illustrated in Figure 8. Figure 8 Changing Speeds for Centrifugal Pump Rev. 0 Page 51 HT-03