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Fish Screen Cleaning Using Underwater, Stationary Nozzles A Case Study…… Michael Lambert, Fish Passage Engineer, Oregon Department of Fish and Wildlife.

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Presentation on theme: "Fish Screen Cleaning Using Underwater, Stationary Nozzles A Case Study…… Michael Lambert, Fish Passage Engineer, Oregon Department of Fish and Wildlife."— Presentation transcript:

1 Fish Screen Cleaning Using Underwater, Stationary Nozzles A Case Study…… Michael Lambert, Fish Passage Engineer, Oregon Department of Fish and Wildlife John Dummer, Project Engineer, Black & Veatch Portland, Oregon Gary Myzak, Project Manager City of Salem, Oregon

2 Today’s Presentation  Site used for case study  Variables associated with underwater cleaning system  Nozzles in use and available  Approach to testing nozzles  Data from nozzle testing  Insights gained from data gathered  Questions

3  Site used for case study Mill Race Fish Screen, Salem, Oregon Mill Race Fish Screen, Salem, Oregon Purpose: Purpose: AestheticsAesthetics Historic hydro facilityHistoric hydro facility Flow through screen ~ 25 to 30 cfs Flow through screen ~ 25 to 30 cfs 10 bays with vertical screens 10 bays with vertical screens Each screen 4’ wide x 5.25’ tallEach screen 4’ wide x 5.25’ tall Hendrick profile bar screenHendrick profile bar screen Cleaning system Cleaning system Nozzle manifold controlled by solenoid valvesNozzle manifold controlled by solenoid valves 15 Hp pump15 Hp pump

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6 Nozzle Manifold Array

7  Variables associated with underwater cleaning system Pressure Pressure Area Area Velocity Velocity Distance from screen Distance from screen Nozzles Nozzles

8  Nozzles in use and available Nozzles in use Nozzles in use Eductor nozzlesEductor nozzles ~ 11 inches from screen~ 11 inches from screen Other Nozzles available Other Nozzles available Solid spray nozzlesSolid spray nozzles Spiral nozzlesSpiral nozzles

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12  Approach to testing nozzles Consistent Approach for Evaluation Consistent Approach for Evaluation Pressure gaugePressure gauge Flutter FrameFlutter Frame Introduction of Common Media Introduction of Common Media Grass ClippingsGrass Clippings Underwater Video CameraUnderwater Video Camera Nozzles/Nozzle Configurations Nozzles/Nozzle Configurations No NozzleNo Nozzle EductorEductor Solid Spray, with and without straightenerSolid Spray, with and without straightener Solid Spray with fanSolid Spray with fan SpiralSpiral Modify distance from screenModify distance from screen

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14 all ports open, no nozzlesspiral nozzle showing spray pattern in air Solid Spray w/ flow straightener, H1/4U-0070

15  Data from nozzle testing Area cleaned by existing nozzles ~ 4 to 6 inches in diameter Area cleaned by existing nozzles ~ 4 to 6 inches in diameter Spiral nozzle Spiral nozzle 10-inch width of flutter10-inch width of flutter Weak forceWeak force 15 degree spray angle w/stabilizer 15 degree spray angle w/stabilizer 6 inch wide by 10 inches high flutter area6 inch wide by 10 inches high flutter area Strong forceStrong force Moving eductor nozzle further from screen Moving eductor nozzle further from screen Did not provide consistent increase in area cleanedDid not provide consistent increase in area cleaned Difficult to evaluate due to pipingDifficult to evaluate due to piping

16 Screen Coverage

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18  Insights gained from data gathered Little data available describing submerged nozzles Little data available describing submerged nozzles Nozzles designed to spray into atmosphere Nozzles designed to spray into atmosphere Difficult to quantify performance of submerged nozzles Difficult to quantify performance of submerged nozzles Submerged nozzle effectiveness depends on several variables Submerged nozzle effectiveness depends on several variables Of the nozzles and nozzle configurations tested none were found to be definitively superior to the eductors Of the nozzles and nozzle configurations tested none were found to be definitively superior to the eductors

19 Thanks  Cooperative Effort  Special Thanks to the City of Salem Gary Myzak, Senior Project Manager Gary Myzak, Senior Project Manager Brandon Clarke and Angel Garcia, City Maintenance Staff Brandon Clarke and Angel Garcia, City Maintenance Staff

20  Questions


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