# Add a New Pump | Top Previous

As an additional exercise add a new (fictitious) centrifugal pump from the following data: Max Operating Pressure = 10 m Water g Suction Size = 150 mm Discharge Size = 100 mm Data Operating Speed = 100 Min Speed = 50 Max Speed = 150 Data Impeller diameter = 250 mm Min Impeller Diameter = 200 mm Max Impeller Diameter = 300 mm It is possible to leave the suction and discharge values at 0. If you do this FluidFlow will not make any size check. FluidFlow makes size checks to ensure you connect up a correct pipe size to the suction and discharge flanges of the pump. The Data Operating Speed and the Min and Max Speed can also be at the same value. You can do this if you do not intend to install a variable speed motor. The Data Impeller Diameter and the Min Impeller and Max Impeller Diameters can also be set to the same value. This may be true if the pump only takes a fixed size impeller. Then enter the capacity, efficiency, and NPSHr curves from Table 5. Table 5 Min Flow limit = 2 l/s Max Flow limit (run out) = 12 l/s Name = [your own choice] An Important point is you should note is the entry at Head = 0. You are unlikely to get this information from any manufacturer, so you must make an estimate. The estimate you make can be guessed (this is OK because we will never operate the pump anywhere near to this condition). When you make the guess at head of zero, ensure that you do not "upset" the shape of the curve for the valid data points by selecting a value that lies on a smooth curve. If you do not make this guess you run the risk of using the pump in a system that is difficult to solve (converge). Now that we have added the data save by pressing the 'OK' button and use the pump in the following simple flowsheet. Check that the flow and head of the pump used in the system lies on the curve that you have previously entered.