Create transients from pump startup events

Step-by-step guide

InfoSurge Pro allows for creating hydraulic transients by providing a curve which will alter pump and valve operations, as well as junction demand changes. This example compares simulation results from different operational conditions.

1. Double-click the desired project .aprx file to open ArcGIS Pro.
2. Click the InfoWater Pro tab to open the InfoWater Pro ribbon.
3. In the Project panel, click Initialize.
4. From the ribbon, Edit panel, enable the Select tool.
5. In the map, select pump 9_PUMP for this example.
6. From the Model Explorer toolbar, select Pump Operation Change.

7. In the Speed/Wicket Gate Change Data dialog box, set the disturbance type to “0: Speed”.
8. Next to the Speed Curve drop-down, click Browse (…) to open the Curve dialog box.

9. Click New.
10. In the New Curve dialog box, enter a curve ID of “CUR3, Pump Speed Up”.
11. Click OK.
12. In the Curve Type toolbar, click Set Rows.
13. In the Curve popup, enter a value of 3.
14. Click OK.

In the table, enter the following values in the X-axis column (time in seconds):

15. In row 1, enter 0.00.
16. In row 2, enter 2.00.
17. In row 3, enter 3.00.

Enter the following values in the Y-axis column (pump speed as a decimal: 0 = 0% and 1 = 100%):

18. In row 1, enter 0.00.
19. In row 2, enter 0.00.
20. In row 3, enter 1.00.

Note that the curve updates visually in the graph view, and indicates that after two seconds, the pump speed will increase from zero to full speed within the next one second.

21. Click OK to close the Curve dialog box.
22. In the remaining dialog box, click Update to close the window and save the settings.

Next, set the pump surge data to select features to be modelled with the pump during a surge simulation:

23. From the Model Explorer toolbar, click Pump Surge Data.

24. From the Pump/Turbine Surge Data dialog box, make sure Check Valve Installed is enabled.

This protects the pump from reverse flow entering.

25. Enter a check valve (CV) Opening/Closing Time of 0.01 seconds.
26. Make sure Non-Reopen CV is NOT enabled.

Since the check valve is closed before the pump starts, if the non-reopen option is enabled, it will close the pump permanently, even though the pump builds up enough head to open the check valve.

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

A surge simulation can now be run:

28. From the ribbon, InfoWater Pro tab, Analysis panel, click Run Manager.
29. In the Run Manager dialog box, switch to the Surge tab.
30. Click Run.
31. When the run is complete, click OK to close the dialog box.
32. From the ribbon, InfoWater Pro tab, View panel, click Report Manager.
33. In the Report Manager dialog box, click New.
34. In the Output Report/Graph dialog box, from the Available Output Sources, select *Active*.Surge.
35. From the Graph Report tab, select Surge Node Graph.

36. Click Open.
37. From the map, select Junction 10 to view its pressure profile.

Junction 10 has a pressure spike at the time of pump startup identified in the speed curve.

38. Close the Report Manager.

Now, set the pump without a check valve:

39. Again, select pump 9_PUMP.
40. From the Model Explorer, click Pump Surge Data.
41. In the Pump/Turbine Surge Data dialog box, disable Check Valve Installed.

42. Click Update.
43. Reopen the Run Manager and click Run.
44. Click OK.
45. Reopen the Report Manager and click Refresh All to refresh the output for Junction 10 after the latest run.

Note that there is no transient with the Check Valve Installed option disabled.

46. Close the Report Manager.

Next, use a lower pump speed to see how it impacts the creation of transient events:

47. From the map, select pump 9_PUMP.
48. From the Model Explorer, click Pump Surge Data.
49. Enable Check Valve Installed.
50. Click Update.
51. From the Model Explorer, click Pump Operation Change.
52. In the Speed/Wicket Gate Change Data dialog box, click Browse (…) to open the Curve dialog box.
53. In the table, Y-column, change the cell in the third row to 0.50.

The graph now shows the pump ramping up to half its full speed within one second after startup.

54. Click OK.
55. Click Update.
56. Open the Run Manager and click Run.
57. Click OK
58. Open the Report Manager and click Refresh All.

Again, the pressure profile for Junction 10 appears as a straight line, with no surge event present in the network.

Finally, perform another run using a longer pump speed change operation time:

59. Select pump 9_PUMP.
60. From the Model Explorer, click Pump Operation Change.
61. In the Speed / Wicket Gate Change Data dialog box, click Browse (…) to open the Curve dialog box.
62. With the CUR3 curve ID selected, in the Y-column, change the value in the third row to 1.00.
63. In the X-column, change the value in the third row to 12.00.

The graph updates to show that the pump speed will increase from 0 to full speed within 10 seconds.

64. Click OK.
65. Click Update.
66. Open the Run Manager and click Run.
67. Click OK.
68. Open the Report Manager and click Refresh All.

Note that while a transient event is produced, it was reduced from the previous results by greatly increasing the time it takes the pump to fully start up.

69. Close the Report Manager.