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CE 3372 Water Systems Design

CE 3372 Water Systems Design. Lecture 10 –Network Models in EPA-NET. Overview. Water Distribution System Components Pumps Valves EPA-NET Workshop. Head. Head is energy per unit weight of water Energy = Kinetic + Potential Energy = Velocity + (Elevation + Pressure)

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CE 3372 Water Systems Design

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  1. CE 3372 Water Systems Design Lecture 10 –Network Models in EPA-NET

  2. Overview • Water Distribution System Components • Pumps • Valves • EPA-NET Workshop

  3. Head • Head is energy per unit weight of water • Energy = Kinetic + Potential Energy = Velocity + (Elevation + Pressure) • EGL = Total head at point in the system

  4. How to select a Pump A quick overview • Step 1 – Place system curves on chart (new and old) • Step 2 – Select flow range (design requirements) • High end = Peak flow + fire • Low = Avg. daily • Step 3 – Narrow down pumps based on operating point • Step 4 – Check Efficiency! (75% +) and Select Pump • Step 5 – If below 75%, try again with new Pump Curves

  5. System Curve when OLD System Curve at NEW standards

  6. Pump and System Curves • Pump Curve – How much energy the pump delivers to the water • System Curve – How much energy it takes to deliver a flow rate to everyone in your distribution

  7. Valves

  8. Valves • Devices which control amount and direction of fluid flow in closed conduit systems • Bronze, brass, iron, or steel alloy

  9. Types of Valves • Stop Valves – Used to completely/partially shut off flow of fluid • (ex: globe, butterfly, gate, plug, needle) • Check Valves – Used to permit flow in only one direction • (ex: ball-check, swing-check, lift-check) • Special Valves • relief, pressure-reducing, remote-operated

  10. Globe Valve

  11. Gate Valve

  12. Butterfly Valve

  13. Valves in EPANET • Valves are links • Limit pressure of flow at a specific point in the network • Input Parameters • Start and end nodes • Diameter • Setting • Status • Output Parameters • Flow rate and headloss

  14. EPA-NET Workshop

  15. Review • In EPANET: • valves are (links or nodes)? • pumps are (links or nodes)? • pipes are (links or nodes)? • reservoirs are (links or nodes)? • In EPANET: • demands are supplied at (links or nodes)? • what is meaning of negative demand? • where are elevations specified? • how is pump performance specified?

  16. Step-by-Step Example

  17. EPANET Example • Network Layout

  18. EPANET Example • Demands

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