UPGRADING SYSTEMS





There are other cases where a traditional single-speed pump is adequate, and investment in a VFD may not result in substantial energy savings.


Table 3. Scenarios where a VFD is either unlikely to result in energy savings or a VFD is not appropriate.


SCENARIO


There is only one target system flow rate and pressure, and


 the water source pipeline pressure or water surface elevation (surface or well pumping level) is relatively constant. and


 only negligible sand wear on pump components is possible.


 , is an engineer at the Cal Poly Irrigation Training  work involves technical consulting, training and research for both irrigation districts and on-farm irrigation systems.


Current pumping costs are relatively small. Energy savings from efficiency improvements are proportional to the existing utility bills.


The pump is used to fill a storage tank, pond or reservoir — and some fluctuation in water level is acceptable.


Direct current is provided to the pump (solar applications).


In these applications, there may not be a need to adjust the pump speed because a wide range of flow rates is acceptable.


A VFD is not applicable in direct current applications.


COMMENTS


Energy savings are minimal when these conditions exist.


FLOW MONITORING FOR A FRACTION OF THE COST


You need systems that save you time and money. So why pay more for expensive electromagnetic meters when the In-Situ MACE AgriFlo meter and Doppler velocity sensor provide reliable flow data for much less.


Learn more about our flexible flow monitoring solution for pipes sized 4 to 100 inches at www.in-situ.com/it3


WATER QUALITY | WATER LEVEL | FLOW | TELEMETRY | APPS & SOFTWARE | AQUACULTURE irrigationtoday.org Fall 2019 | Irrigation TODAY 27


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