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Trooper W. Smith, P.E. Freese and Nichols, Inc. 10814 Jollyville Rd., Bldg 4, Suite 100 Austin, TX 78759

MINIMIZE YOUR FOOTPRINT AND YOUR MAINTENANCE HEADACHES SELF CLEANING TRENCH TYPE WET WELL DESIGNS. Trooper W. Smith, P.E. Freese and Nichols, Inc. 10814 Jollyville Rd., Bldg 4, Suite 100 Austin, TX 78759. PRESENTATION OBJECTIVES. Story Time - Pump Station 13B

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Trooper W. Smith, P.E. Freese and Nichols, Inc. 10814 Jollyville Rd., Bldg 4, Suite 100 Austin, TX 78759

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  1. MINIMIZE YOUR FOOTPRINT AND YOUR MAINTENANCE HEADACHES SELF CLEANING TRENCH TYPE WET WELL DESIGNS Trooper W. Smith, P.E. Freese and Nichols, Inc. 10814 Jollyville Rd., Bldg 4, Suite 100 Austin, TX 78759

  2. PRESENTATION OBJECTIVES • Story Time - Pump Station 13B • Introduction to Trench Type Wet Wells • Introduction to Self Cleaning Operation • Would the design be right for you?

  3. PROJECT SCOPE • Trinity River Authority • CRWS Treatment Plant • Design and Construction of Pump Station 13B • Fluid of Interest: Return Activated Sludge • Final Clarifiers – Traveling Bridge Suction Clarifiers • Thin Sludge • Firm Capacity – 200 MGD for WWTP • Downrated PS-13 – 50 MGD (North Plant, Trains 1-3) • New PS-13B – 50 MGD (North Plant, Trains 4-6) • Uprated PS-13A – 100 MGD (South Plant, Trains 7-12)

  4. 13 13B 13A

  5. HISTORY OF THE PROJECT YEAR 2006 YEAR 2007 TO 2009 YEAR2005 YEAR 2007

  6. TOPIC

  7. PUMP STATION EVALUATION • Dry-Pit/Wet-Pit • Horizontal Non-Clog Centrifugal Pumps (PS-13 and PS-13A) • Vertical Non-Clog Centrifugal Pumps (PS-6 and PS-6A) • Wet-Pit • Vertical Turbine Solids Handling Pumps (VTSH)

  8. Horizontal Non-Clog Centrifugal Pump (PS-13A) Pump Station 13A Vertical Non-Clog Centrifugal Pumps (PS-6 and 6A)

  9. VTSH PUMPS

  10. VTSH PUMPS City of Phoenix, 23rd Ave. WWTP (36-inch VTSH Pumps)

  11. LIMITATIONS AT PS-13B SITE • 60-inch Final Clarifier Effluent Line • 84-inch Primary Clarifier Effluent Line • Electrical Duct Bank • Caustic Soda Tank • 2-inch to 12-inch Lines • 12-foot Roadway Existing Structures and Utilities

  12. DRY PIT VERSUS WET PIT Relocated 60-inch FCE Line Relocated Pavement Footprint of Dry-Pit/Wet-Pit (Horizontal Non-Clog Pumps) Relocated Caustic Soda Building Relocated 84-inch PCE Line

  13. Footprint of Wet-Pit Wet Well (VTSH Pumps) Existing Caustic Soda Storage Facility, 84-inch PCE Line, 60-inch FCE Line and Pavement Remains Unchanged

  14. DRY PIT VS. WET PIT * Total Pump Cost for 3 Pumps ** OPCC: Opinion of Probable Construction Cost

  15. TOPIC

  16. TRENCH TYPE WET WELL • Invented by D.H. Caldwell in 1964 • Improved by Dr. Robert Sanks, Ph.D., P.E. • 1:1 scale model of portion of trench floor • Result: >5 fps requirement • 1:3.3 scale model of the Kirkland Pump Center • Result: Only a small portion of the sand was ejected at pump down equilibrium. • 1998 Breakthrough • 2nd Edition of Pumping Station Design • ANSI/HI 9.8 Pump Intake Design Illustrative View of Kirkland Pump Station (Washington)

  17. ANSI/HI 9.8 Pump Intake Design (1998)

  18. ANSI/HI 9.8 Pump Intake Design (2012)

  19. TRENCH TYPE WET WELL • Suitable for Design Flows > 3 MGD • Pump Intakes, Confined in a Deep, Narrow Ditch • Pump Intakes, Substantially Lower Than Upstream Inlet Pipe

  20. TRENCH TYPE WET WELL • Suitable for Different Pump Types/Arrangements • Wet Pit or Dry Pit/Wet Pit • Pumps • VTSH • Submersible • Non-Clog Centrifugal • Suitable for Different Fluids • Clean Water • Activated Sludge • Raw Wastewater Dallas Water Utilities Central WWTP Influent Pump Station (335MGD initial capacity, 425MGD ultimate capacity)

  21. TRENCH TYPE WET WELL • Advantages • Superb Hydraulic Environment for Pump Intakes • Minimum Footprint Size • Small Floor Area (Minimum accumulation of sludge or grit) • Ease and Quickness of Cleaning • Reduced Disposal of Materials • Disadvantages • Compact, Minimal Storage Capacity • Increased Depth • Clogging if Pumps Not Used

  22. WET PIT VS. TRENCH TYPE * Total Pump Cost for 3 Pumps ** OPCC: Opinion of Probable Construction Cost

  23. Site Plan – RAS Pump Station 13B

  24. Wet Well Trench Flow Splitter Wet Well Plan Elevation at 415.00’

  25. SECTION VIEWS Water Guide Sloping Walls Fillet Flow Splitter Trench

  26. SECTION VIEWS

  27. 1 fps max above trench 4 fps (wet pit) 3 fps (dry pit) Illustrative Section of Pump Station 13B – Normal Operation

  28. SELF CLEANING CYCLE Cleaning Ramp 30-60% Flow Trench Components Pump Down Hydraulic Jump Mixes sludge and scum into a mass that is ejected by the last pump.

  29. Cleaning Ramp Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)

  30. Cleaning Ramp Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)

  31. Cleaning Ramp Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)

  32. Cleaning Ramp Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)

  33. TOPIC

  34. CONSTRUCTION PHOTOS

  35. CONSTRUCTION PHOTOS

  36. CONSTRUCTION PHOTOS

  37. CONSTRUCTION PHOTOS

  38. CONSTRUCTION PHOTOS

  39. CONSTRUCTION PHOTOS

  40. CONSTRUCTION PHOTOS

  41. CONSTRUCTION PHOTOS

  42. CONSTRUCTION PHOTOS

  43. CONSTRUCTION PHOTOS

  44. CONSTRUCTION PHOTOS

  45. TOPIC

  46. ACKNOWLEDGEMENTS • Trinity River Authority of Texas • ANSI/HI (Hydraulic Institute) Pump Standards, 1998/2012 • Pumping Station Design, 3rd Edition • Editor-in-Chief: Garr M. Jones, P.E. • Co-Editors: Dr. Robert L. Sanks, Ph.D., P.E. Dr. George Tchobanoglouos, Ph.D., P.E. Bayand E. Bosserman II, P.E. • Dr. Robert L. Sanks, Ph.D., P.E. (Quality Control) • Dr. Joel E. Cahoon, Ph.D., P.E., Montana State University

  47. CLOSING REMARKS / QUESTIONS Contact Information Trooper Smith tws@freese.com 512-617-3116 • Is this the right design for you? • Limited on Space? • Solids/grit problem? • Tired of maintenance intensive cleaning? • Don’t prefer dry-pit/wet-pit? • Pre-Design Evaluation • Cost Analysis (Life Cycle) • Benefits Analysis • Reference Calls • Site Visits

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