Perform a pump trip analysis

Step-by-step guide

InfoSurge Pro allows hydraulic transients to be created by providing a curve to alter pump and valve operations, as well as junction demand changes. Then, the simulation results from different operational conditions can be compared. In this example, a pump trip analysis is performed using the Pump File option.

1. Double-click the desired project .aprx file to open ArcGIS Pro.
2. Once the project starts, click the InfoWater Pro tab to open the InfoWater Pro ribbon.
3. In the Project panel, click Initialize.

First, specify the properties of the pump to be used in the surge analysis:

4. With the Select tool active, from the map, select pump 9_PUMP.
5. From the Model Explorer, click the Pump Surge Data button.

6. In the Pump/Turbine Surge Data dialog box, enable Check Valve Installed to prevent reverse flow through the pump.
7. Enter a CV Opening/Closing time of 0.01 seconds.
8. Enable Non-Reopen CV.

With this option enabled, the check valve will not open if it has already closed, or if the pump and check valve start the simulation closed.

9. To assign a pump file, enable Pump File Provided.

The available files are a table defining head and torque as a function of flow and speed and will be used as the basis for modelling the selected pump during the simulation.

10. Expand the associated drop-down and select 0: Pump File #1 (1270/25).

The data within the 8 available files are based on experimental data. If needed, there is a Pump File Selector calculator that can help select the most appropriate pump file.

11. In the Pump File Settings group box, set Rated Head (ft) to 204.
12. Set Rated Flow (gpm) to 1866.
13. Set Inertia to 40.
14. Set Efficiency (%) to 80.
15. Set Rated Speed (rpm) to 1800.
16. Set Initial Speed Ratio to 1.

This data would typically come from the pump manufacturer.

17. Click Update to save the settings and close the dialog box.

Next, set the Pump Operation Change data:

18. From the Model Explorer, click the Pump Operation Change button.
19. In the Speed/Wicket Gate Change Data dialog box, set the Pump Disturbance Type drop-down to 1: Trip.
20. Assign a trip start time of 2 seconds.

This means that 2 seconds into the simulation, the pump will run down according to the data specified in the Pump Surge Data dialog box, where the non-reopen check valve and pump file were selected.

21. Click Update to save the changes and close the dialog box.

Now, run a surge analysis:

22. From the Model Explorer, click the Run Manager button.
23. From the Run Manager dialog box, click the Run button to run a surge analysis.
24. When the analysis is complete, click OK to close the Run Manager.

25. From the ribbon, View panel, click Report Manager.
26. In the Report Manager dialog box, click the New button to open the Output Report/Graph dialog box.
27. Under Available Output Sources, select *Active*.Surge.
28. From the Graph Report tab, select Surge Node Graph.

29. Click Open.
30. Select Junction 10 to view its pressure profile.

Note how the minimum and maximum pressure readings indicate the effects of the pump shutdown.

31. Close the Report Manager.