Engineering Design Manual - Loudoun Water

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Chapter 9: Sewage Pumping Stations 3. Package Pumping Stations a. Definition -- Package pumping stations are defined here as wet well/dry well pumping stations in which the pumps, suction and discharge piping, pump dry well, electrical equipment and connections are pre-assembled by a single manufacturer and then erected on-site by the Contractor. Package pumping stations with metal well chambers shall not be acceptable. Only pre-cast concrete well chambers shall be acceptable. b. Configuration -- Package pumping stations shall be of a wet well/dry well configuration. Electrical equipment shall be located above grade in a building erected above the dry well chamber. Access hatches for the dry well shall be located in the floor of the electrical building. Pumps shall be of the dry-pit submersible type with media-cooled motors. Equipment hatches and monorail hoist will be provided for pump removal. See Figures 9.5 and 9.6. 4. Conventional Pumping Stations a. Definition -- Conventional pumping stations are defined here as pumping stations in which the wet well and dry well structures are formed and poured onsite. All of the piping and valves are assembled by the Contractor. b. Configuration -- Wet wells shall be divided into 2 chambers connected by a sluice gate in the divider wall, with operating stem extended up to grade level, so as to to enable one of the chambers to be taken out of service for maintenance without taking the station off-line. Influent sewage should flow into an influent channel with sluice gates or slide gates to enable sewage to flow to one or both of the chambers. Influent channel will have a hydraulically driven comminutor for grinding debris. Also provide a bypass channel and trash rack. Wet wells shall have a walkway spanning the length of the wet well. Grab bars shall be provided from grade level to the walkway and from the walkway down into each chamber. Grab bars shall be equipped with safety extension poles. See Figures 9.7 and 9.8. c. Electrical equipment shall be located above grade in a room above the dry well. Access to the pumps for removal shall be located in the floor and directly above the pumps. A monorail shall be provided to facilitate removal of the pumps. Pumps shall be of the drypit submersible type with liquid-cooled motors. Dry well shall be designed with at least one unused space for a future pump to accommodate future upgrades. Electrical/control room should be designed with extra space to accommodate future upgrades. Pump suction piping shall be connected to the dry pit sump to enable one of the pumps to be used for dewatering of the dry pit. The valve for opening this dry-pit suction connection as well as the pump suction isolation valve shall have extended operator stems up to the control room. A surge relief valve shall be placed on the discharge force main before the piping leaves the station. Surge relief valves and piping shall discharge to the wet well. Engineering Design Manual September 2010 132
Chapter 9: Sewage Pumping Stations Figure 9.1 -- Typical Suction Lift (Station Layout) Engineering Design Manual September 2010 133
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Engineering Design Manual September
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TABLE OF CONTENTS PAGE Chapter 1: L
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TABLE OF CONTENTS PAGE Chapter 4: W
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TABLE OF CONTENTS PAGE Chapter 7: C
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TABLE OF CONTENTS PAGE L. Controls
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Chapter 1: Loudoun Water’s Role C
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Chapter 1: Loudoun Water’s Role A
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Chapter 1: Loudoun Water’s Role T
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Chapter 1: Loudoun Water’s Role 1
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Chapter 1: Loudoun Water’s Role c
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Chapter 1: Loudoun Water’s Role S
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Chapter 1: Loudoun Water’s Role F
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Chapter 2: Administration 2.1 Exten
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Chapter 2: Administration Developed
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Chapter 2: Administration C. Protec
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Chapter 2: Administration B. Bond R
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Chapter 3: Application and Plan Pre
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Chapter 4: Water Distribution Chapt
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Chapter 4: Water Distribution Resid
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Chapter 4: Water Distribution deten
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Chapter 4: Water Distribution d. Wi
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Chapter 4: Water Distribution Figur
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Chapter 4: Water Distribution 5. Co
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Chapter 4: Water Distribution 14. L
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Chapter 4: Water Distribution B. Me
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Chapter 4: Water Distribution D. Cr
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Chapter 4: Water Distribution 7. Pi
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Chapter 4: Water Distribution 3. Wh
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Chapter 5: Wastewater Collection 2.
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Chapter 5: Wastewater Collection mo
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Chapter 5: Wastewater Collection B.
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Chapter 5: Wastewater Collection is
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Chapter 5: Wastewater Collection C.
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Chapter 5: Wastewater Collection Pr
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Chapter 5: Wastewater Collection Ma
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Chapter 6: Reclaimed Water Chapter
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Chapter 6: Reclaimed Water 5. Adjoi
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Chapter 6: Reclaimed Water 13. Valv
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Page 104 and 105: Chapter 7: Community Water Systems
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Page 171: Appendix A Appendix A: Application
Page 175 and 176: Checklist for Construction Plans PR
Page 177: Sewer - Plan View 1st sub. 2nd sub.
Page 180 and 181: Item Description Quantity Unit Unit
Page 183: Appendix B Appendix B: Wastewater C
Page 186 and 187: Sanitary Sewer Minimum Core Separat
Page 189 and 190: I. Introduction The Loudoun County
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Community Systems Design Review Pro
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Community Systems Design Review Pro
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Community Systems Project Initiatio
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Community Systems Construction Proc
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Community Systems Construction Proc
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Community Systems Preconstruction C
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I. Corrosion Control All storage ta
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i) The depths of soil samples colle
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Class 2 pipelines in moderately cor
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with cable cutters. Remove the insu
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4. Pipeline station numbers for wir
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a. name of the Corrosion Technician
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voltmeter with a test lead. Obtain
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Table 1 Cathodic Protection Test Da
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Table 3 Linear Continuity Calculati
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Table 5 Field Electrical Isolation
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Appendix F Appendix F: Construction
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Engineering Design Manual - Loudoun Water

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