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Powering ePUMP-FLO’s hydraulic pump selection
capabilities is the industry standard PUMP-FLO program.
This technology has been built on over 15 years of
research, development and extensive testing. The
following information describes the basic functions of
ePUMP-FLO hydraulic pump selection technology. |
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» Specifying
the Pump Operation and Units
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ePUMP-FLO gives you the option of choosing either 50 Hz or 60
Hz operation. You also specify US or Metric units. After the
frequency and units have been specified, ePUMP-FLO presents
you with a list from which you can choose from multiple pump types and speeds.
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» Specifying
the Fluid
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In ePUMP-FLO, the fluid data is used in calculating the Net
Positive Suction Head available, brake horsepower, and
viscosity correction factors. The default fluid in ePUMP-FLO
is water at 60 °F (15.6 °C), however there are 120
additional fluids available. You also have the option of entering
a different fluid and specifying its properties (temperature,
specific gravity, and viscosity). If you’re selecting pumps
for a high viscosity application, ePUMP-FLO automatically
corrects the pump performance data using the method outlined
in the Hydraulic Institute Standards. |
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» Specifying
the Design Point and Searching the eCatalog
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Next, ePUMP-FLO asks you to specify the design point. The
design point is the flow rate and corresponding total dynamic
head (TDH) that the pump must supply. Once the design point is
specified, the ePUMP-FLO search engine and the
manufacturer’s eCatalog return a list of pumps that meet the
design point. |
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» The Selection
List
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The pumps that meet the design point are displayed in the
selection list. The selection list provides a convenient way
of comparing the various pumps. The columns in the selection
list are described below:
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- Type/Size - The manufacturer’s pump type and
pump size (or model name).
- Speed - The pump test speed for fixed speed
pumps, or the pump speed necessary to intersect the design
point for adjustable speed pumps.
- Dia - The pump impeller diameter. Impeller
diameters are rounded to the manufacturer's specified trim
increment.
- Eff - The pump efficiency at the design point.
- NPSHr - The Net Positive Suction Head required by
the pump at the design point.
- Power - The power required at the design point.
- Motor - The motor size, listed in either hp or
kW.
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» The Graph
Window
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Choosing the most desired pump type/speed from the selection
list completes the selection. ePUMP-FLO then generates a
dynamic pump operating curve in the Graph Window. The pump
curve displays the pump head, efficiency, horsepower, and NPSHr as a function of flow rate. |
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The pump type/size, speed, diameter, efficiency, NPSHr, power,
and motor size for the design point are listed below the
graph. You also have the ability to change the efficiency curve format from iso-lines to a single line curve. |
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» Changing the
Pump Speed and Diameter
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You can adjust the pump speed and impeller diameter by
entering new values in the Speed and Dia boxes. ePUMP-FLO then
redraws the curves and updates the data listed below the
graph. |
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NOTE: The pump speed can only be adjusted between the test
speed (or maximum speed, if specified by the manufacturer) and
the minimum speed found in the manufacturer's catalog. The
impeller diameter can only be adjusted between the pump’s
maximum and minimum diameters, in trim increments specified by
the manufacturer.
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