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In Rural Water Alliance Pump Stations
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In Rural Water Alliance Pump Stations Presentation Transcript

  • 1. ALLIANCE OF INDIANA RURAL WATER Spring 2007 - Bloomington Wastewater Pumping System Design Considerations and Troubleshooting
  • 2. Seminar Overview
    • Site Selection
    • Basis of Design Considerations
    • Key Design Issues
    • Operational Troubleshooting
    • Wrap-up and Final Questions
  • 3. Intro to F&V/Speaker
    • F&V Summary
      • IN presence since late 1970s as Gove Associates
      • 120+ Staff with Indianapolis/Ft Wayne Offices
      • 70% of our clients are small-mid size communities
    • Ed’s Background
      • 21 yrs experience (over 10 in IN)
      • WWTP/CSO/Collection/PSs/IPP/System Rehab.
      • Civil/Env Eng with Hydraulics/Hydrology Conc.
  • 4. Site Selection (new locations)
    • Location-Location-Location
      • Facility Depth
      • Property Size
      • Growth Provisions
    • Environmental Issues
      • Wetlands
      • Floodplains
      • Aesthetic Surroundings
  • 5. Site Selection (cont)
    • Access Issues
      • Maintenance Vehicles
      • Chemical Feed
      • Adverse Weather
      • Drainage/Floodplains
    • Utility Infrastructure
      • Electrical service
      • Telemetry signal / system issues
  • 6. Basis of Design (exist PS)
    • Why is it important to understand this?
      • Know the facility limitations (flow, area etc)
      • Be aware of design constraints / limitations
        • Discharge Conditions
        • Low Flow Conditions
        • Peak Flow Conditions
        • Expansion Constraints
  • 7. Basis of Design (cont)
      • Pump Station Design
        • Know “factory” original capacity
        • Original wetwell cycle times
        • Understand O&M schedules/issues
        • Equipment Life Cycles (anticipate future costs)
        • Odor control
        • Floatable Solids
        • Grease/Oils
  • 8. Basis of Design (new)
    • Important Components to Have Input On
      • Location – Location – Location
      • Service Area – Existing and Future
      • Access – Maintenance & Chemical Delivery
      • Hydraulic Design
        • Wet well capacity / cycle times
        • Peak Flow Capacity
        • Number and Size of Pumps
        • Pump Control Approach (VFD/Constant)
        • Low Flow Conditions
        • Impeller Selection
  • 9. Basis of Design (cont)
      • Type of pump station (submersible etc)
      • Electrical Service
        • Phase
        • Voltage
      • Pump Control Issues
        • VFD vs Constant Speed
        • Start/Stop Level Control Type
      • Provisions for future capacity
        • Impeller changes
        • Pump changes
        • Wetwell Changes
  • 10. Key Design Issues - Summary
    • Site Design Considerations
    • Pump Station Type / Pump Selection
    • Hydraulic Pump Design
    • Wetwell Design
    • Controls/Telemetry
    • Odor Control
  • 11. Site Design Considerations
    • Site Access Issues – Daily
    • Site Access Issues – Chemical Feed Deliveries
    • Electrical Power Facilities (OH/Transformers)
    • Configuration of PS Structures
    • Drainage Considerations
    • Telemetry Considerations
    • Future Capacity Considerations
  • 12. Pump Station & Pump Selection
    • Submersible
    • Self-Priming
    • Dry Pit
    • Alternative Configurations
    • High Flow
    • CSO/Storm
  • 13. Pump Basics Pump Types / Characteristics
  • 14. Pump Basics (cont)
    • Pump Selection Factors
      • Fluid Type
      • Flow
      • Solids Handling Requirements
      • Site and Facility Constraints
      • Existing Equipment/Owner Preference
  • 15. Pump Basics (cont) Specific Gravity of Pumped Fluid has large affect on Total Dynamic Head
  • 16. Submersible
  • 17. Self-Priming
    • Cost-Effective
    • Equipment at Ground Level – maintenance
    • Needs site fencing for security
  • 18.  
  • 19. Dry Pit Installations
  • 20. Centrifugal Pump Curve
  • 21. Alternative Installations Submersible pumps can be installed in dry-pit applications
  • 22. Alternative (cont)
    • Heavy solids issues require special pumps
  • 23. High Flow Pumping
    • Turbine, Mixed and Axial Flow Pumps
  • 24. High Flow (cont)
  • 25. CSO / Stormwater
  • 26. CSO / Storm (cont)
  • 27. CSO / Storm (cont)
  • 28. Hydraulic Pump Design
  • 29. Hydraulic (cont)
  • 30. Hydraulic (cont)
  • 31. Hydraulic (cont) Net Positive Suction Head (function of alt/fluid/lift/suction friction losses
  • 32. Hydraulic (cont)
    • Suction Side Cavitation
      • Air Entrainment
      • Improper Suction Piping
    • Discharge Side Cavitation
      • Runout beyond pump curve
  • 33. Wetwell Design
    • Sizing is a function of the following:
      • Flow
      • Horsepower
      • Cycle Times (starts per hour)
    • Try to avoid air entrainment
    • Try to provide uniform approach velocities
  • 34. Wetwell (cont)
  • 35. Wetwell (cont)
  • 36. Controls / Telemetry
    • Pump Controls (on/off)
      • Floats
      • Air Pressure Bells
      • Pressure Transducer
    • Pump Speed Controls
      • Constant Speed
      • VFD
      • Belt Drives (shive adjustable)
  • 37. Odor Control
    • Key Elements to Fight Odor Problems
      • Correct hydraulic and pump station design
      • Treat the wastewater (chemicals/aeration etc)
      • Treat the off gases (activated carbon)
  • 38. Operational Troubleshooting
    • Many future operational problems can be prevented by a thorough checkout at startup.
      • Do not rely just on the standard manufacturer’s forms
      • Remember the pump station basis of design and other key pump design information after the PS is placed into service.
  • 39. Troubleshooting (cont)
    • Potential Operational Problems
      • Pump clogged
      • Reduced actual pumping rate
      • Overheating/Breaker Issues
      • Control malfunctions
      • Excessive flows
      • Grease/Oil/Floatable Solids
      • Odor Issues/Corrosion Issues
      • Pump Vibration
  • 40. Troubleshooting (cont)
    • Many Different Factors can lead to similar problems.
  • 41. Troubleshooting (cont)
  • 42. Conclusions