1. Select the Appropriate Pumps and Controls

2. © Irrigation Association Understanding Basic Pump Selection Considerations Matching the pump and system Flat vs. steep curves

3. © Irrigation Association

4. Water Horse power where: WP=water power output, hp H =total operating head, ft Qs =design discharge of the irrigation system, gpm © Irrigation Association

5. Brake horse power where: BP= power input required by the pump, hp Ep = the pump efficiency, %. © Irrigation Association

6. Total power input where: KW= pumping plant power input, kw Ep = the pump efficiency, %. Em= the motor efficiency, %. © Irrigation Association

7. Total Dynamic Head (TDH) is the energy that the pump imparts to the water for a specific flow rate (measured in feet) H p = pressure at outlet of discharge pipeline H s = lift (+) or head (-) from water surface to pump H e = lift (+) or fall (-) from pump to outlet of discharge pipeline H f = friction loss in discharge pipeline H m = miscellaneous losses (e.g., valves, reducers, etc.) Total Dynamic Head (TDH)

8. Practice example The GIR requirement is 1 inch per 3 days and the fraction of operating time is t = 0.9. The irrigated area is 130 acres. The pumping lift (H lift ) from water surface in sump to the ground surface is 10 ft and includes the friction loss in the pump intake pipe. The pressure requirement at the pump outlet, Pout, is 79 psi. © Irrigation Association

9. Let’s Go to Our Manuals and See What We Can Learn

10. Steep v.s. flat © Irrigation Association

11. System curves © Irrigation Association

12. System Curves © Irrigation Association

13. Big Nozzle approach where: Qs=design system discharge, gpm Ks=system discharge coefficient TDH=total dynamic head (system head), ft  E=total elevation change in the system, ft © Irrigation Association

14. Understand Types of Electronic Controls Available System protection and shut down Automated controls Remote controls

15. © Irrigation Association Integrate Pump and Pivot Controls

16. © Irrigation Association Inside the Alignment Box

17. © Irrigation Association Chemical Injection Equipment

18. © Irrigation Association Electronic Controls

19. © Irrigation Association Computer Management

20. © Irrigation Association Computer Management

21. Controls

22. Pressure actuated Safety switch – Loss of prime, broke pipe, loss of fuel, etc. Demand switches Startup control – Controlled startup of flow Back flow devices Shut off – Pivot stuck or stopped

26. Oil pressure – High or low Time delay limit switch Flow switch – No flow, high flow Phase monitor timers

27. Alarms High or low pressure High or no flow Low oil Low pressure Etc.

28. Variable speed devices Potentially Ideal Applications – Widely varied flow Requirements – Less total head needed as flow requirements are dropped (Extreme friction loss or major draw-down changes in a well) – Single Well serving a very large acreage – Long operating hours at less than full flow – Varied crops, multiple systems on one pump – Steep pump curves

30. © Irrigation Association Let’s Go to Our Manuals and See What We Can Learn