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Conserving Kilowatts in a Major Pump StationTom AllbaughTetra TechJune 27, 2011

1Pump Replacement - Martz Road and Willow Run Pump Stations

Martz Road WW Pump Station

Project SpecificsAll Flow to YCUA WWTP is PumpedOriginal Stations Built Early 1980sStd Centrifugal Sewage PumpsExtended Motor ShaftsThrottling to Match Flow

Pumping Capacity ChangesMartz RoadWillow RunOriginal design flow, MGD14.510.9New design peak flow22.413.0Number of pumps44Capacity per pump, MGD7.54.4Average daily flow4.83.3Energy Consumption with Constant Pump and Motor EfficiencyImage taken from: Variable Speed Pumping A Guide to Successful Applications

Throttle Valve Control

Image taken from: Variable Speed Pumping A Guide to Successful ApplicationsSpeed ControlImage taken from: Variable Speed Pumping A Guide to Successful Applications

Impacts on Energy at Martz RoadImpacts on Energy at Willow RunThrottling vs. Variable Speed CostsMartz RoadWillow RunAverage monthly KW-Hr before$7,250$4,940Average monthly KW-Hr after$5,150$3,325Estimated annual cost savings$25,200$19,400Project cost$2,479,000$1,687,000Pumps$480,000$245,000VFDs$180,000$160,000Before

After

Out with the Old, In with the New

New and Old Together

Making Pipework Work

New Pump on Foundation

New Foundation and Suction Elbow

Typical Pump Control Valve

Questions?