Pump Station Considerations for a Simple Duplex Station Discharging into a Combined Regional Force Main Rachel Rausch, EIT.

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Presentation transcript:

Pump Station Considerations for a Simple Duplex Station Discharging into a Combined Regional Force Main Rachel Rausch, EIT

Site Location

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: Calculations Wastewater flow from site: Peaking Factor=4 Q peak =92.4 BJWSA storage volume requirement: Storage volume in site MH and pipes > 24 hour volume from site

Pump Selection Existing force main conditions analyzed Regional Force Main Pump station on 1,000 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 Design Point:310 gpm at 102’ TDH Hazen-Williams C Factors: C 1 =110 C 2 =130

System Curves-Pumps Off Design Point:410 gpm at 96’ TDH Hazen-Williams C Factors: C 1 =110 C 2 =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