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      <textarea class="form-control-plaintext form-control-sm" id="address" name="address" readonly="readonly" rows="3" style="height: 100%;max-height: 80px;">364 Monte Elma Road
Montesano, WA 98563
US</textarea>
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CASE STUDY




FROM RAGS TO RICHES: CHOPPER PUMP GETS IT DONE

Source: Vaughan Company

The North Tahoe Public Utility District (NTPUD) serves residents and vacationers
in the Lake Tahoe area. Vaughan Co. provided a 50 HP, 1750-RPM model PE4P6CS-118
vertical pedestal chopper pump for the Carnelian Bay Pump Station to replace an
existing pedestal pump, which was having difficulty with ragging. The Vaughan
pump was intended to be driven by a Variable Frequency Drive (VFD) to provide
1150 GPM at 84' TDH at less than 1750 RPM, but because of costs the VFD was
eliminated from the project.

During startup Vaughan's representative, Rockwell Engineering & Equipment, found
that the pump was vibrating because it was operating in high-flow cavitation.
With no installed VFD, the pump couldn't be slowed down to reduce head and flow.
With all organizations working together (Vaughan, Rockwell, Resource
Development, Kennedy / Jenks Consultants, and NTPUD), static pressure gauge
readings showed that the discharge elevation established in the 1950's was off
by 14 ft. This resulted in less static head than expected, causing the pump to
operate in a cavitation region of the head/flow curve. Here was a critical pump
operating in a severely vibrating condition because operating conditions were
different from those specified, just 5 days before Christmas. And overflowing
the lift station into Lake Tahoe was certainly not an option.



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From Rags to Riches: Chopper Pump Gets It Done


VAUGHAN COMPANY

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364 Monte Elma Road Montesano, WA 98563 US
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MORE FROM VAUGHAN COMPANY

 * IMPROVING INFLUENT SCREEN WASHING FOR A FRACTION OF THE ESTIMATED COST
   
   The use of Vaughan's self-priming chopper pump and nozzles upstream of the
   influent screens is increasing the amount of fecal matter passing through the
   influent screens, which in turn improves...

 * IMPROVED PUMP AND SEAL RELIABILITY WHEN AND WHERE IT REALLY COUNTS
   
   The City of Chester, IL was getting only about 6 months life out of the
   mechanical seals in their former non-clog lift station pumps. While replacing
   seals twice per year was difficult and expensive,...

 * CHOPPER PUMPS PRODUCT CATALOG
   
   For over 60years, Vaughan has been the market leader in manufacturing chopper
   pumps, solving today’s toughest solids-pumping problems.

 * ROTAMIX PROCESS MIXING SYSTEM BROCHURE
   
   Vaughan’s Rotamix® system is today’s most cost effective means of mechanical
   hydraulic mixing, consisting of an engineered arrangement of floor mounted
   nozzles fed by a Vaughan®...

 * MIXED UP ABOUT TWAS?
   
   The Vaughan Rotamix® mixing system for the blend tank at the Salmon Creek
   Wastewater Treatment Plant, Vancouver, WA, should have had plenty of mixing
   flow for stirring up the sludge considering...

 * HOW TO GET A ONE-YEAR PAYBACK ON RETROFIT CHOPPER PUMPS FOR YOUR PACKAGED
   LIFT STATION

 * OPTIMIZING EXISTING DESIGNS THROUGH COST-EFFECTIVE SIMULATION

 * A FAIRY TALE ENDING AT A PUMP STATION

 * CHOPPING AWAY AT SOLIDS

 * MIXING COMPARISON: HYDRAULIC OR GAS

 * THE INVISIBLE SEWAGE PLANT

 * VERTICAL WET WELL CENTRIFUGAL CHOPPER PUMP

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