Multiple Operating Points

One of the new features in the latest release of PUMP-FLO Connect is the ability to store and display multiple operating points and system resistance curves in addition to the rated design point and default system resistance curve.

When sizing and selecting a pump, it is of course necessary to have a rated design point which consists of a flow rate and total head with the option of a static head.  This is the primary criteria on which the catalog search is performed.  The rated design point is located on the “Criteria” page and appears as shown in the example in Figure 1:

Figure 1:  Rated Design Point


Now in PUMP-FLO Connect, users have the option of specifying additional operating points and system resistance curves to be displayed pumps’ graph windows.  This might include operating points with different static heads and total heads, or even with different flows as well.  It is entirely up to the user what can be put into the operating points interface.  While these points are not used as criteria for pump selection, the standard warning messages will apply if these points are outside of the pumps’ limits.

The method for entering the additional operating points starts with clicking on the “Advanced Criteria” link.  This will open the newly formatted Advanced Criteria dialog box as shown in Figure 2:

Figure 2:  Advanced Criteria dialog


Next, a Flow, Head, and Static Head are specified for an additional operating point under “Operating Points” and the “Add” button is clicked.  This will add the new operating point to the list below.  The operating points in this list can be deleted if the user desires.  This can be done for multiple additional operating points as shown in Figure 3:

Figure 3: Advanced Criteria dialog with Additional Operating Points


When the user has finished with the operating points and any other advanced criteria, the “OK” button is clicked to return to the primary search criteria page, and then the “Search” button is clicked to search the catalog and create a pump selection list.

From the selection list, clicking on one of the pumps opens up the graph window as shown below in Figure 4:

Figure 4:  Pump Graph Window with All Operating Points and Resistance Curves


The graph in Figure 4 displays the rated design point (large red marker) and the additional operating points (small red markers) as well as the auto-generated system resistance curve (black SRC) and the additional system resistance curves (blue SRCs).

The user also now has the ability to display the system resistance curves, or to turn them off by modifying the graph settings.  When the ”Modify” button is clicked, the Customize Graph Display Options dialog is opened as shown in Figure 5:

Figure 5:  Customize Graph Display Options dialog


In the Optional Curves section, the Auto Generated SRC box and Other SRC’s box are checked by default.  If, for example, the user chooses to turn off the additional SRC curves, it’s simply a matter of unchecking the Other SRC’s box, and clicking the OK button.  The graph window then displays the additional operating points, but without the SRC curves drawn through them.

Figure 6:  Pump Graph Window with All Operating Points and just the Auto Generated Resistance Curve


There is no hard limit to the number of operating points that a user may enter, though there is likely a practical limit to the number which can be visually distinct.  This feature is set to be rolled out with the 1.7 release of PUMP-FLO Connect and will also be available through Web Services.