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CE 3372 water systems design

Learn about the design and modeling of pumps in Epanet for water systems. Understand how to add pumps as links between nodes, specify pump curves, and operate pumps within range. Examples provided.

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CE 3372 water systems design

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  1. CE 3372 water systems design Lecture 19: pumps in epanet

  2. outline • Pumps as links • Example 5 • Example : Elaborate system with a pump.

  3. Pumps in EPA-NET • Pumps are modeled as links between two nodes that have pumping curve properties. • Each node must have appropriate elevations. • A pump is added as a link, then the pump curve is specified for that pump. • The program will operate the pump out-of-range but issue warnings to guide the analyst to errors.

  4. Example 4 Example 4 – Lifting with a pump

  5. Example 4 Example 4 – Lifting with a pump

  6. Example 4 Example 4 – Lifting with a pump

  7. Modeling Protocol Sketch a layout on paper Identify pipe diameters; length; roughness values Identify node elevations; demands Supply reservoir (or tank); identify reservoir pool elevation Identify pumps; pump curve in problem units

  8. Modeling Protocol Z = 10m L2 = 100mD2 = 100mm Pump Z = 3m Z = 0m L 1=4mD1=100mm Sketch a layout on paper

  9. Modeling Protocol L 1=4mD1=100mm ks~ 0.85 L2 = 100mD2 = 100mm ks~0.85 Identify pipe diameters; length; roughness values

  10. Modeling Protocol • Identify node elevations; demands • Node 1 = 3m • Node 2 = 3m • No demands at nodes (needed for connection to pump)

  11. Modeling Protocol • Supply reservoir (or tank); identify reservoir pool elevation • Lower Reservoir Pool Elev. = 0m • Upper Reservoir Pool Elev. = 10m

  12. Modeling Protocol • Identify pumps; pump curve in problem units • One Pump – Connects from Node 1 to Node 2

  13. Example 4 Build and Run Model

  14. Network Simulation An Example – with a pump

  15. Problem Statement

  16. Modeling Protocol Sketch a layout on paper Identify pipe diameters; length; roughness values Identify node elevations; demands Supply reservoir (or tank); identify reservoir pool elevation Identify pumps; pump curve in problem units

  17. Sketch a layout Sketch a layout on paper

  18. Pipes Adjust roughness values to match these. Start at 0.26, use D-W head loss model Identify pipe diameters; length; roughness values

  19. Nodes Identify node elevations; demands

  20. Tank Diameter Z=315 ft Max Level is this distance Z=300 ft Min Level is this distance L2=120 ft Node 2 Pipe 8: L1 + L2 = 300 ft Z=180 ft Elevation L1=180 ft • Supply reservoir (or tank); identify reservoir pool elevation • May need assumptions • Tank dimensionsshould be sensible • Pipe length is given

  21. Pumps • Identify pumps; pump curve in problem units • None this problem!

  22. Construct Model – Run Simulation

  23. Runs to Match Friction Factors

  24. Full Status Report (1 of 3)

  25. Full Status Report (2 of 3)

  26. Full Status Report (3 of 3)

  27. Assess Results Problem is given in GPM, so changing to CFS is unnecessary complication Velocity in the pipe from the tank is 15 ft/sec – higher than typically desired; consider larger pipe or flow control valve

  28. Problem Statement Starting with the same system as in the first example add a pump and its supply to the system

  29. Modeling Protocol Sketch a layout on paper Identify pipe diameters; length; roughness values Identify node elevations; demands Supply reservoir (or tank); identify reservoir pool elevation Identify pumps; pump curve in problem units

  30. Sketch a layout Sketch a layout on paper

  31. Pipes • Identify pipe diameters; length; roughness values • Add to previous system to build model

  32. Nodes • Identify node elevations; demands • Add to prior system to build model

  33. Pumps • Identify pumps; pump curve in problem units • Add to prior system to build model

  34. Construct Model – Run Simulation

  35. Status Report

  36. NEXT TIME • Storage considerations • Tanks vs. reservoirs • Flow equalization

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