Pump curve

A pump curve file is created by entering the flow rates, heads and efficiencies of the pump at several points from the pump manufacturer’s performance curve.  

From the Stations menu, under Pump stations, double clicking on the cell containing the pump curve name results in a dialog box that will help edit or create a pump file.  Choosing Open will show the pump curve data in a spreadsheet. To create a new pump curve, open an existing pump data file, make changes to the data and use  the Save As option  from the File menu to save under the new file name.                        

 Pump curve data are ASCII text files that can be edited easily. As a convention, all pump curve data files are designated with the .PMP extension, such as  COMPTON.PMP.  The maximum set of data points allowed on a pump curve is 15 sets. For each pump station, a maximum of 5 pumps either in series or parallel  can be specified. Therefore  5 pump curve data files can be specified per  pump station on the spreadsheet describing the pump station data.   

Individual pump curves may be reviewed, edited and plotted from the screen above. Options are available to calculate pump performance at different impeller diameters and speeds as shown in the pull down menu option above.

You may estimate the pump performance at different impeller diameters and speeds using the data entry screen shown below.
Enter the current pump impeller diameter and speed that will be used as a basis to predict performance at a different impeller  size and/or speed using the Pump Affinity Laws.  If the speed is constant, leave the entries under Impeller speed unchanged.       To calculate performance at a different impeller diameter, enter the final diameter along with a modified pump file name for    saving the results of the calculated pump performance.

Similarly, if impeller size is unchanged, but the pump performance at a different impeller speed is desired, leave the entries    under impeller diameter unchanged. Make changes to the impeller speeds and specify a file name to save the modified pump performance data. 

Since the speed ratio and diameter ratios are used in the calculations, the actual values of the pump impeller speeds and diameters do not matter.

Individual pump curves may be reviewed, edited and plotted as shown below.