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Coanda Screens - Elgin Equipment Group

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Elgin Equipment Group's Coanda Screens are Tough, Proven Solutions for a variety of applications including small hydro, micro hydro, and low head sites.

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Coanda Screens - Elgin Equipment Group

  1. 1. EEG Water Coanda Screens
  2. 2. Coanda Screens Coanda Screens • Inclined screens that use overflowing water to stay clean • Tough screens with very low maintenance • Clean water falls through; fish & debris pass over
  3. 3. Coanda Screens Coanda screens are tilted profile wire bar screens. The shape of the screens allows the screens to remain clean with little or no mechanical cleaning. The operation is enhanced by the Coanda Effect as the screens catch only the bottom layer of water. The tilted profile wires of the Coanda Screen slice off thin layers of water, allowing debris and fish to pass safely over the screen as water falls through the screen.
  4. 4. Coanda ScreensValue Proposition Simplify the intake with Coanda Intake design Cost Item Typical Savings Desilting structure Cap-Ex 10% Desilting structure excess flow 5% Coanda operating cost 5% Eliminate the Desander
  5. 5. Coanda Screen Performance Testing Key Results: • Defined adjustments for full scale • Determined impact of flow in excess of design • Determine impact of high debris US Bureau of Reclamation Testing Key Results: • Developed governing equation • Determined impact of various parameters CSU Testing: • Tested one meter of screen for flow, cavitation, and debris Debris laden water over a 2mm screen Debris over the toe Fine debris through the screen Overflow Debris Testing
  6. 6. Design Guidance: Coanda Screens Headat𝑄𝑥 Zero Bypass Case Bypass Flow Gross Head for Intake Θ
  7. 7. Design Guidance: Coanda Screens 3 Decisions: • Accelerator Size and Shape • Screen Slot Width • Design Loading
  8. 8. Design Guidance: Coanda Screens 3 Decisions: • Accelerator Size and Shape • Screen Slot Width • Design Loading Finer Safety Factor
  9. 9. Coanda Screens: Debris Passage Fixed frame rib designed for extreme condition Replaceable Screen Panel. Design case considerations below Cost of stainless steel to withstand extreme design case Cost of mobilization, material, and supply for more frequent repairs 3 Decisions: • Accelerator Size and Shape • Screen Slot Width • Design Loading
  10. 10. Coanda Screens: Debris Passage The boulders and logs pictured here passed over the screen without reducing flow or damaging the screen.

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