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PUMP MAINTENANCE IN THE WATER INDUSTRY
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
WHAT WILL WE DISCUSS TODAY?• Main Components
• Principles of Operation
• Key Failure Points
• Inspection
• Maintenance
• Troubleshooting
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
MAIN COMPONENT PARTS -CENTRIFUGAL• Impellor
• Wear Rings/Efficiency Rings
• Cooling Jacket
• Volute
• Suction
• Discharge
• Coupling
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
IMPELLOR / WEAR RING• Impellor
• Wear Rings/Efficiency Rings
• Cooling Jacket
• Volute
• Suction
• Discharge
• Coupling
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
COOLING JACKET
• With radiant Coolant used in pump
• Cooled with pumpage only
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
PROTECTIVE DEVICES• Seal Fail Detector
• Overtemp
• Usually in the motor side
• Vibration switches
• Protective Relays
• Phase Loss
• Over/Under Voltage
• Low Suction Pressure
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
WHAT MAKES A PUMP WORK?• Driver – Electric Motor
• Volute
• Suction size vs. discharge size
• Shape of Volute “forces” pumpage to discharge
• Impellor
• Shape and Style “Slings” pumpage
• Gap between wear and efficiency rings
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
KEY FAILURE POINTS• Bearings
• Ball and Thrust Bearings
• Sealing Components• Lip Seals
• O-Rings
• Mechanical Seals
• Impellor damage usually caused by one or more above
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
PUMP STATION INSPECTIONVisual
Electrical
Mechanical
Operation / Performance
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
Organization: Mfg: HPLift Station: Model PhasePump ID # Serial # Voltage
GPM RPMFthd FLA
Visual InspectionControl Panel ExteriorExposed SOW/SEOW CordStrain Relief on CableVisible Portion of RailWetwell LidConnection to Generator
Electrical TestingMegger Test Ph1Megger test Ph 2Megger test Ph3Milliohm Test A-BMilliohm Test A-CMilliohm Test B-CVolts to Mtr Ph1Volts to Mtr Ph2Volts to Mtr Ph 3Amps Ph1Amps Ph2Amps Ph 3
System TestingRun HoursFlow testVolute Inspection Transfer Switch
ControlsFloat Test - Invert float manually to see if pumps cycle properlyFloat test - Disconnect electrically, raise float and test for continuitySeal Failure - Test for open circuitTemp Devices / RTD's test for open circuitLead/Lag Cycle
NAMEPLATE INFO
A&W ELECTRIC, INC.LIFT STATION INSPECTION REPORT
DATE
PUMP STATION INSPECTION & MAINTENANCEInspection
Testing
Maintenance
Next Steps
We need to think about
Frequency – Based on age & condition of station as well as influent
Scope – How often do we want to do each test?
Maintenance – How can we prevent problems, extend life?
What happens when we run into an issue – Seal Fail, overamping, etc.
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
INSPECTION PROCESS -ELECTRICALElectrical
• Is voltage to the control panel within 3% of nominal
• Is voltage balanced across all three phases
• What is the amp draw of each of the motors? Trend of amp draw?
• What is the condition of wire and starters inside the panel?
• Contactor coils burnt and dark
• Loose connections?
• Is SO cord rotted and cracking? Swollen?
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
INSPECTION - OPERATION• Do pumps cycle adequately?
• Are all alarms and control lights working?
• Is an alarm condition communicating back to Scada/Mission?
• Are contactors pulling in when control asks them to?
• If alternating relay, are pumps cycling properly?
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
INSPECTION MECHANICAL• Are floats clean? Are they operating?
• How do we test floats?
• Is well excessively dirty:
• Trash and debris in well
• Sand and grit?
• Flow test – are we flowing to the curve? What is the trend? • GPM
• PSI
• Drawdown
• Have we inspected volute for blockage?
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
CAUSES OF PROBLEMS – ELECTRICAL AND MECHANICAL
• Poor voltage delivery
• Bad/Loose connections
• Loss of phase
• Weak/ Dirty contactors
• Bad cable in pump
• Bad windings in electric motor
• Blockage in Well
• Blockage in pump
• Cavitation
• Worn impellor
• Bad mechanics in pump causing extra load
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
PUMPS IN THE WASTEWATER INDUSTRY
TIM HEBERT A&W ELECTRIC, INC. (704) 363-3144 TIM@AANDWELECTRIC.COM
Thank you for your attendance !For more information contact:Tim Hebert – A&W Electric(704) 333-4986 (O)tim@aandwelectric.comwww.aandwelectric.com
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