TODAY S COUPON: 425 MGD Pump Station at 30% OFF
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1 TODAY S COUPON: 425 MGD Pump Station at 30% OFF Bryan Jann, P.E. Freese and Nichols, Inc. July26, 2012
2 The Big Picture
3 South Dallas Peak Flow Pump Station DWU Central Wastewater Treatment Plant Permitted Average Daily Flow 150 MGD White Rock Raw Sewage Pump Station Long-term influent pumping solution Peak wet weather flow management Flow control and flow splitting Higher hydraulic grade line White Rock Peak Flow Pump Station
4 FORCE MAIN & DRAIN LINES WHITE ROCK PEAK FLOW PUMP STATION PEAK FLOW BASINS WHITE ROCK STRUCTURE 84 HORSESHOE WHITE ROCK PLANT 120 WEST BANK INTERCEPTOR WHITE ROCK RAW SEWAGE PUMP STATION 84 HORSESHOE 60 DIVERSION TO WHITE ROCK PLANT 48 WARREN AVENUE LEVEE JUNCTION STRUCTURE DALLAS PLANT FUTURE FACILITIES S1 S TO DALLAS PLANT 60 WEST BANK 2 90 TO IPS 72 CADIZ DIVERSION INFLUENT PUMP STATION INFLUENT JUNCTION STRUCTURE FORCE MAIN TO 120 WEST BANK INTERCEPTOR (BY OTHERS) SOUTH DALLAS PEAK FLOW PUMP STATION PEAK FLOW BASINS 2 60 CADIZ FORCE MAIN CADIZ STREET PUMP STATION KEYS TO SYMBOLS EXISTING STRUCTURE EXISTING LINE DECOMMISSIONED PUMP STATION DECOMMISSIONED LINE IPS STAGE 1 STRUCTURE IPS STAGE 1 LINE IPS STAGE 2 STRUCTURE (PROPOSED) IPS STAGE 2 LINE (PROPOSED) FIRM / TOTAL PUMPING CAPACITY
5 Design Flow Determination Minimum Flow Peak 2-hr Flow 0.31 (MFF) 2.89 (PF) Year CWWTP Minimum Hourly Design Flow (MGD) CWWTP Average CWWTP Peak 2Day Design Flow hr Design Flow (MGD) (MGD) MGD minimum influent pumping at WRRSPS Influent Pump Station Minimum Design Flow (MGD) Base Load Flow (MGD) Stage 1 Stage Maximum Pumping Capacity (MGD) Maximum Hydraulic Capacity (MGD)
6 Maximum Discharge Allocations Discharge Location Dallas Plant White Rock Diversion Future Facilities Peak Flow Basins* * Allocations are MG Stage Stage 2 (Y2020/Y2025)
7 Pump Station Overall Section
8 Equipment Selection Coarse Screens COARSE SCREENING EQUIPMENT EVALUATION MATRIX Chain Type (Conv) Chain Type (Catenary) Cog Wheel/Climber Hydraulic Telescoping Gripper Rope/Cable Wt % Space Requirements Odor Control and Cleanliness Equipment Function Constructability Item 1 Capital Cost 2 4 Operation and Maintenance Total peak flow Multi-rake for Low Headroom requirement Positive DWU experience
9 Screen Specifications 1-inch bar spacing 47-foot channel depth 6-foot channel width 85 degree incline from horizontal Low headroom Discharge to water sluice Drive Shear Pin Head Sprocket Wiper Chain Chain Guides Bar Rack Side Frame Foot Shaft Sprocket Boot Plate
10 Equipment Selection - Pumps PUMP EQUIPMENT EVALUATION MATRIX Submersible Vertical Turbine (VTSH) Horizontal Centrifugal Vertical Centrifugal Categor y Wt% Weighted Weighted Weighted Weighted 1 Capital Cost Maintenance Ancillary Systems Item 5 30% Cost 15Savings 8 Above-grade Size of Pump Station 15 6 Maintenance Applications 5 Ease of Expansion 6 Energy Cost 7 Equipment Flood Protection Total
11 Pump Specifications 42-inch diameter columns 62-foot overall length 50 ton unit weight Stage 1 2 Pumps 43,000 gpm (~62 70 TDH 1,000 HP motors (VFD) 4 Pumps 34,500 gpm (~50 70 TDH 800 HP motors (VFD)
12 Owner s Perspective Owner s Early Involvement in Pump Design Equipment Site Visits Specifications Pre-submittal Meetings Extensive Vibration Monitoring Equipment Six Probes per Pump Portable Equipment Classroom Training
13 Owner s Perspective Single-point of Responsibility Pump Manufacture (motor, VFD) Complete System Testing Warranty, Service Agreement 2 year warranty 3 year service agreement
14 Design Challenges (1) Pumps Materials of Construction Hydraulic Requirements Vibration Requirements Pump Servicing Limited Similar Size Applications Pump Selection
15 Design Challenges (2) Trickling Filter Demolition Station Hydraulics Multiple Discharge Locations Varied Flows Coordination with Other On-Site Pump Stations Influent Flow Control and Junction Structure Hydraulic Modeling
16 Design Challenges (3) Proximity to the Federal Levee USACE Coordination/Permit Process Additional Geotechnical Investigation Specialized Shoring and Slope Protection Relocation and Reorientation of Site
17 Design Challenges (4) Construction Sequencing Isolation of Flows Use of Existing Facilities Provisions for Peak Flow Events
18 Under Construction (1) Demolition Rock Excavation Varying Site Conditions
19 Under Construction (2) Major Structures Complete Influent Connection Made Discharge Connections to be Made in September 2013
20 Under Construction (3) Estimated Completion of March 2014
21 Acknowledgements Thank you to DWU for selecting the Freese and Nichols, Inc. team for the development and execution of the Influent Pump Station. The AECOM Gupta and Associates JQ Perkins Engineering Consultants VAI Architects Lim & Associates Team: Yard Piping Power Supply and Controls Structural Odor Control/Biofilters Architectural Surveying and Site Civil
22 Questions and Answers DWU has purchased this deal!
Transport of Wet Weather and Average Flows An Innovative Approach
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