POROSITY PLATE BAFFLE DESIGN FOR FISH SCREEN FLOW CONTROL Peter - PowerPoint PPT Presentation

POROSITY PLATE BAFFLE DESIGN FOR FISH SCREEN FLOW CONTROL Peter Christensen, PE R2 Resource Consultants

PLAN VIEW OF FLOATING SURFACE COLLECTOR (FSC) NET PRIMARY SECONDARY SCREENS SAMPLING AND HOLDING TRANSITION SCREENS

PLAN & PROFILE VIEW OF FSC SCREEN CHANNEL

SCREEN/BAFFLE SUPPORT STEEL 12” WIDE FLANGE COLUMN (TYP) PLAN 12” WIDE FLANGE COLUMN (TYP) PROFILE

SECONDARY SCREEN/BAFFLE ARRANGEMENT SCREEN BOLTS TO FRONT OF COLUMN BAFFLE BOLTS TO BACK OF COLUMN PRIMARY SUPPORTS SECONDARY SUPPORTS

INSTALLED SCREEN/BAFFLE ARRANGEMENT SCREEN ATTACHED TO BAFFLE ATTACHED TO FRONT OF COLUMN BACK OF COLUMN

SCREENS INSTALLED ON COLUMNS

BAFFLES INSTALLED BEHIND SCREENS

SCREEN AND BAFFLE PANELS INSTALLED W12 COLUMN SCREEN PANEL BAFFLE PANEL BAFFLE ADJUSTMENT SCREW

PRIMARY BAFFLE DRAWING

SECONDARY BAFFLE DRAWING

BAFFLE ARRANGEMENT Critical that Both Plates be the Same Material Preferably a High- 3”+/- DIA. PERF Strength Plastic for PLATE HOLES Flexibility and Sealing STIFFENER AND RETAINER BARS ADJUSTABLE UHMW PERF PLATE FIXED UHMW PERF PLATE FLOW

UHMW PERF PLATE ATTACHMENTS ADJUSTMENT SCREW FIXED UHMW PERF PLATE ADJUSTABLE UHMW PERF PLATE ATTACHMENT OF ADJUSTABLE ATTACHMENT OF FIXED UHMW PERF PLATE UHMW PERF PLATE

TYPICAL PRIMARY BAFFLE PANEL

BAFFLE PANEL SHOWING ADJUSTMENT SCREWS

BAFFLE PANEL FRAME FABRICATION

TYPICAL SECONDARY BAFFLE PANEL

ADJUSTMENT SCREW

UHMW PERF PLATES

COMPARISON POROSITY PLATES VS. LOUVERS Louvers: • Vertical Slot along Each Edge of the Louver Blade  Flow Not Evenly Distributed over Screen Area  Small Adjustment can Have Large Impacts on Flow  Difficult to Fine Tune  Hydraulics Difficult to Pre-Design or Model Baffle Settings  Need to Field Set – Timely and Cost Consuming Porosity Plate Baffles: • Small Baffle Holes Over Entire Area  Evenly Distributes Flow over Screen Area  Adjustments Have Smaller Impact on Flow – Easier to Fine Tune  Can Pre-Design Settings for Desired Flow Conditions  Required Field Adjustments are Minimal

EXAMPLE OF BAFFLE PRESETS BASED ON DESIGN VALUES Starboard Initial Baffle Settings Port Initial Baffle Settings Baffle Porosity Turns from Full Centerline Baffle Porosity Turns from Full Centerline Panel (percent) Open (nearest Opening Panel (percent) Open (nearest Opening Number 1/8 turn) (inches) Number 1/8 turn) (inches) P1-A 13.20 6 7/8 1.85 P2-A 13.20 6 7/8 1.85 P1-B 13.20 6 7/8 1.85 P2-B 13.20 6 7/8 1.85 P3-A 13.20 6 7/8 1.85 P4-A 13.20 6 7/8 1.85 P3-B 13.20 6 7/8 1.85 P4-B 13.20 6 7/8 1.85 P5-A 13.20 6 7/8 1.85 P6-A 13.20 6 7/8 1.85 P5-B 13.20 6 7/8 1.85 P6-B 13.20 6 7/8 1.85 P7-A 13.25 6 7/8 1.86 P8-A 13.25 6 7/8 1.86 P7-B 13.25 6 7/8 1.86 P8-B 13.25 6 7/8 1.86 P9-A 13.25 6 7/8 1.86 P10-A 13.25 6 7/8 1.86 P9-B 13.25 6 7/8 1.86 P10-B 13.25 6 7/8 1.86 P11-A 13.05 7 1.84 P12-A 13.05 7 1.84 P11-B 13.05 7 1.84 P12-B 13.05 7 1.84 P13-A 12.75 7 1/8 1.81 P14-A 12.75 7 1/8 1.81 P13-B 12.75 7 1/8 1.81 P14-B 12.75 7 1/8 1.81 P15-A 12.40 7 3/8 1.77 P16-A 12.40 7 3/8 1.77 P15-B 12.40 7 3/8 1.77 P16-B 12.40 7 3/8 1.77 Starboard Pump Sump Differential Port Pump Sump Differential 0.54 Feet Below Reservoir 0.54 Feet Below Reservoir Centerline Opening