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CE 3372 Water Systems Design

CE 3372 Water Systems Design. Lecture 11 – Pumps in EPANET. Overview. EPANET Network Simulation (an example) EPANET Pump Simulation. Network Simulation. An Example. Problem Statement. Modeling Protocol. Sketch a layout on paper Identify pipe diameters; length; roughness values

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CE 3372 Water Systems Design

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  1. CE 3372 Water Systems Design Lecture 11 – Pumps in EPANET

  2. Overview • EPANET Network Simulation (an example) • EPANET Pump Simulation

  3. Network Simulation An Example

  4. Problem Statement

  5. 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

  6. Sketch a layout • Sketch a layout on paper

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

  8. Nodes • Identify node elevations; demands

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

  10. Construct Model – Run Simulation

  11. Runs to Match Friction Factors

  12. Full Status Report (1 of 3)

  13. Full Status Report (2 of 3)

  14. Full Status Report (3 of 3)

  15. 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

  16. 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.

  17. Example 4 • Example 4 – Lifting with a pump

  18. Example 4 • Example 4 – Lifting with a pump

  19. 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

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

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

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

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

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

  25. Example 4 • Build and Run Model

  26. Network Simulation An Example – with a pump

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

  28. 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

  29. Sketch a layout • Sketch a layout on paper

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

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

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

  33. Construct Model – Run Simulation

  34. Status Report

  35. Readings (on server)

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