Attachment_IB_-_Lift_Station_Overview.pdf

ATTACHMENT IB

Lift Station Overview

Repair 2 Effluent Re-lift Stations

USDA-ARS

Stuttgart National Aquaculture Research Center

(SNARC)

Booneville, Arkansas

RFQ No. AG-32SD-RFQ-14-MD05

Final

DATE: April 29, 2014

Lift Station OverviewLift Station Overview

Water & Wastewater Utility Operation and M t f T ibManagement for Tribes

Wastewater Lift Station

What is a Lift Station?

Lift stations

• At low point in• At low point in collection system

• Function to Lift and• Function to Lift and Push wastewater from lower elevation to a higher elevation

Source:© T-T Pumps LTD. 2011

Lift Stations

Types of Collection System Lift Stations

• Submersible Pump Lift Station

• Dry Well Lift Station• Dry-Well Lift Station

What is a Wet Well?

Submersible Pump Lift Station

Collection System “outlet” Control Panel

& AlarmValve Vault

• Wet well Valves Collection System

• Multiple Pumps

• Valve Vault

“inlet”

Float Switch

• Control Panel

Al Source: © 2006 Norweco Inc

Float Switch

• Alarm Source: © 2006 Norweco, Inc.

Pumps

Wet-Well with Submersible Pumps

Storage Vault Size Wastewater flow Storage Volume

• Working

• Sump

8’

• Sump

• Emergency

What formula is used D=8’ to calculate the storage volume per

H=1’vertical foot in an 8’ diameter wet well?

H=1

Types of Submersible Pumps

Pumps Commonly Used

Grinder Pump Submersible Effluent Pump

Source: www.sewagejector.netSource:http://www.libertypumps.com

Submersible Lift Station O&M O&M Access

Hatch- Access to Valve Vault

Control Panel Hatch- Access

Control Panelto pumps

Lift Station – Connections

Locate components high in tank riser

• Pipe Connections

• Valves

• Electrical Junction Boxes

Lift Station – O&M

Periodically Inspect Wet Wells

• Check for oil & grease

• Check for debris and grit depositsCheck for debris and grit deposits

Lift Station O&M

Inspect on a Routine Basis

• Alarms

- Test alarms manually

- Visual and audible alarms

• Pump Operationp p

- Manually operate pumps

- Review data from flow meters or measure pressure in discharge forcemain

Lift Station O&M

Inspect on a Routine Basis

• Switching Functions

- Inspect floats, run manual test

• Record Pump Run Times

- Longer, less frequent pump run g , q p p times are ideal

• Measure pump voltage and p p g amperage

- High or low amperage readings i di t blmay indicate problem

Grinder Pump

Grinder Pump

• Lift raw wastewater to collection system• Lift raw wastewater to collection system

• Reduces the size of solids in wastewater by grinding them into a slurryg g y

• Large horsepower pump

• Smaller diameter forcemain

• Wet well has short retention time• Wet well has short retention time

Grinder Pump System Maintenance

System Reliability

• User education and Cooperation to not discharge troublesome solids

- Hard solids

- Plastics

- Sanitary Products

- Rags- Rags

- Stringy Materials

Grinder Pump System Maintenance

Routine cleaning of vault

• Wash down grinder pump vaults

• Float Switches

• Run pumps and controllers through full cycle

• Take voltage and amperage readings high amperage indicates clogamperage indicates clog

Dry Well Lift Station

Lift Station – Dry Well Wet Well• Pumps

• Valves & Controls

Wet-Well

Alarm

• Ventilation

• Receiving

W t W ll Inlet

Valves

Wet-Well

Dry-well VaultDry well Vault

PumpsControl Panel Source: Norweco - PosaPrime

Pumps

Float Switches

Dry Well

Dry Well Size- Dry Pump Room

• Space for operator

• Lift Pumps• Lift Pumps

• Ventilation System

• Valves

• Control PanelControl Panel

• Sump pump for floor drain

Dry-Well Lift Station

Wet Well Size

Volume

• Working Volume

• Emergency Storage Volume

• Sump Volume

Float Switches

• Pump “on” or “off”Pump on or off

• Alarms

Dry Well Lift Station AdvantageDry Well Lift Station Advantage Easy Access for routine visual pump inspection

Control Panel & Alarm

Source: CrosStar, LLC.

Source: JacksonControls LLC.

Copyright © 2005 by the Discount-Pumps.biz

• Enclosed Panel

• Wired to pumps and float switches

O ll l• Operator can manually control pumps

• Sounds high water alarm/ Display Visual Alarm

S f t ti t t di l t l t• Some feature connection to an auto-dialer to alert operator of alarm

Emergency Response

Emergency Operating Procedures

• Educate community

• Quick response to back ups or AlarmsQuick response to back ups or Alarms

- Respond within 4-6 hours

- Response time depends on emergency storage p p g y g volume and flow into wet well

• Provide additional storage in wet well for short g term power outages or pump failures

• Multiple pumps at lift station, alternate in normalMultiple pumps at lift station, alternate in normal operating conditions

Emergency Power

• Portable emergency generator available to id d i l tprovide power during long outages

• Electrical adaptor for connection of portableElectrical adaptor for connection of portable generator power to control panel

Emergency Power

• Lift stations with generator located on site

• ATS – Auto Transfer Switch

• Exercise standby• Exercise standby power source weekly

Pump Failure Procedure

• Septic tank pump trucks

• Track mounted pumps on hand for failures

- New lift station installations may include a- New lift station installations may include a bypass connection in valve vault

Safety-Potential hazards

Classified as Confined Space

• Exposure to Gases

• Portable gas meter

- Hydrogen Sulfide (rotten egg smell)

- Ventilation (30 minutes min.)

Operators should be advised of procedures and- Operators should be advised of procedures and precautions

• Electrical Safety –y code awareness

• Hygiene and exposure yg p to wastewater

Maintenance Activities

Safety

• Minimum of two trained employees for service calls

• Access to a lift for pump p p service that requires pump removal

Source: doonwoodengineering comSource: doonwoodengineering.com

What Have We Learned?

• Dry Wells and Wet Wells• Dry Wells and Wet Wells

• Grinder Pumps and Submersible PumpsGrinder Pumps and Submersible Pumps

• Common O&M IssuesCommon O&M Issues