Fish Screen Cleaning Using Fish Screen Cleaning Using Underwater, Stationary Underwater, Stationary

Nozzles A Case Study……Nozzles A Case Study……Michael Lambert, Fish Passage Engineer,Michael Lambert, Fish Passage Engineer,Oregon Department of Fish and Wildlife Oregon Department of Fish and Wildlife

John Dummer, Project Engineer,John Dummer, Project Engineer,Black & Veatch Portland, OregonBlack & Veatch Portland, Oregon

Gary Myzak, Project ManagerGary Myzak, Project ManagerCity of Salem, OregonCity of Salem, Oregon

Today’s PresentationToday’s Presentation

Site used for case studySite used for case study Variables associated with underwater Variables associated with underwater

cleaning systemcleaning system Nozzles in use and availableNozzles in use and available Approach to testing nozzlesApproach to testing nozzles Data from nozzle testingData from nozzle testing Insights gained from data gatheredInsights gained from data gathered QuestionsQuestions

Site used for case studySite used for case study Mill Race Fish Screen, Salem, OregonMill 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 screens10 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 systemCleaning system• Nozzle manifold controlled by solenoid valvesNozzle manifold controlled by solenoid valves• 15 Hp pump15 Hp pump

Nozzle Manifold ArrayNozzle Manifold Array

Variables associated with underwater Variables associated with underwater cleaning systemcleaning system PressurePressure AreaArea VelocityVelocity Distance from screenDistance from screen Nozzles Nozzles

Nozzles in use and availableNozzles in use and available Nozzles in useNozzles in use

• Eductor nozzlesEductor nozzles• ~ 11 inches from screen~ 11 inches from screen

Other Nozzles availableOther Nozzles available• Solid spray nozzlesSolid spray nozzles• Spiral nozzlesSpiral nozzles

Approach to testing nozzlesApproach to testing nozzles Consistent Approach for EvaluationConsistent Approach for Evaluation

• Pressure gaugePressure gauge• Flutter FrameFlutter Frame

Introduction of Common MediaIntroduction 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• Spiral Spiral • Modify distance from screenModify distance from screen

all ports open, no nozzles spiral nozzle showing spray pattern in air

Solid Spray w/ flow straightener, H1/4U-0070Solid Spray w/ flow straightener, H1/4U-0070

Data from nozzle testingData from nozzle testing Area cleaned by existing nozzles ~ 4 to 6 inches in Area cleaned by existing nozzles ~ 4 to 6 inches in

diameterdiameter Spiral nozzleSpiral 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 screenMoving 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

Screen CoverageScreen Coverage

Screen CoverageScreen Coverage

Insights gained from data gatheredInsights gained from data gathered Little data available describing submerged nozzlesLittle 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 Submerged nozzle effectiveness depends on several

variablesvariables Of the nozzles and nozzle configurations tested none Of the nozzles and nozzle configurations tested none

were found to be definitively superior to the eductorswere found to be definitively superior to the eductors

ThanksThanks

Cooperative EffortCooperative Effort Special Thanks to the City of Salem Special Thanks to the City of Salem

Gary Myzak, Senior Project ManagerGary Myzak, Senior Project Manager Brandon Clarke and Angel Garcia, City Brandon Clarke and Angel Garcia, City

Maintenance Staff Maintenance Staff

QuestionsQuestions