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Pump Station Considerations for a Simple Duplex Station Discharging into a Combined Regional Force...
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Transcript of Pump Station Considerations for a Simple Duplex Station Discharging into a Combined Regional Force...
Pump Station Considerations for a Simple Duplex Station Discharging into a Combined Regional
Force Main
Rachel Rausch, EIT
Site Location
Bluffton, SC
Project Background
• Private development client
• Development includes two large retail buildings, service station,
bank, and general commercial
• No gravity sewer service in area
Project Background
Unique Design Considerations• Donation of project to Beaufort Jasper Water and Sewer
Authority (BJWSA)
• Little topographical variability on site
• Deep wetwell
• Site pump station will pump into 16” combined regional
force main Unknown conditions in regional force main
Design Solution: Data Collection
• BJWSA Standards
• Force main record drawings
• Force main operating conditions
• Operating pressure
• Flow
Design Solutions: Calculations• Wastewater Flow Estimate
• Site Storage Volume
• Force Main Operating Conditions
• Choosing Pumps
Design Solutions: CalculationsWastewater flow from site:Peaking Factor=4Qpeak=92.4
BJWSA storage volume requirement:
Storage volume in site MH and pipes > 24 hour volume from site
Pump SelectionExisting force main conditions analyzed
• Regional Force Main Pump station on• 1,000 gpm @ 70’ TDH
• Regional Force Main Pump Station CP-67 off
• No flow in regional force main
• Two C factors analyzed for each system curve
System Curve-Pumps On
0 200 400 600 800 1000 12000
50
100
150
200
250System Curve-Regional Force Main Pumps On
TDH C1 MIN [FT] TDH C1 MAX [FT] TDH C2 MIN [FT] TDH C2 MAX [FT] PUMP CURVE #1
PUMP CURVE #2 PUMP CURVE #3 PUMP CURVE #4 PUMP CURVE #5 PUMP CURVE #6
Flowrate (gpm)
TDH
(ft)
Design Point:310 gpm at 102’ TDH
Hazen-Williams C Factors:C1=110C2=130
System Curves-Pumps Off
0 200 400 600 800 1000 12000
50
100
150
200
250
300
350System Curve-Regional Force Main Pumps Off
TDH C1 MIN [FT] TDH C1 MAX [FT] TDH C2 MIN [FT] TDH C2 MAX [FT] PUMP CURVE #1
PUMP CURVE #2 PUMP CURVE #3 PUMP CURVE #4 PUMP CURVE #5 PUMP CURVE #6
Flowrate (gpm)
TDH
(ft)
Design Point:410 gpm at 96’ TDH
Hazen-Williams C Factors:C1=110C2=130
Pump Selection
Other Calculations
• Cycle time
• Buoyancy Calculations
• High groundwater table
• Deep wetwell, approximately 24 feet deep
Final Pump Station Layout
Project Status• BJWSA Approval• Construction Status
Questions?
Lessons Learned