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Pumps

How much will I save?

Table 1 shows an example of applying the U.S. Department of Energy's (DOE's) Pumping System Assessment Tool (PSAT) to a typical pumping system. PSAT software is designed to help end-users identify opportunities to improve energy efficiency.

The table shows the improvement in efficiency achieved by replacing a relatively inefficient existing pump and motor system with either an energy-efficient motor or a more-efficient optimal pump and energy-efficient motor. Note the payback period indicated at the bottom of the table.

Table 1: Pumping system assessment tool example

Pump and Motor System Calculated Results
Pump style End suction   Existing pump and motor Existing pump and energy-efficient motor Optimal pump and energy-efficient motor
Pump nameplate, rpm 1770 Pump efficiency (percent) 72.7 72.7 81.8
Specific gravity 1.0 Motor rating (hp) 125 125 125
Number of stages 1 Shaft power (hp) 112.5 112.5 99.9
Nameplate hp 125 Motor efficiency (percent) 93.3 95.2 95.4
Motor nameplate, rpm 1780 Motor power factor 84.9 85.4 84.2
Existing motor Standard Motor (amps) 130.8 127.2 114.6
Motor voltage 460 Electric power (kW) 90 88.1 78.2
Electricity cost 8¢/kWh Annual energy (MWhr) 788.4 771.4 684.6
Required conditions   Annual power cost $63,100 $61,700 $54,800
Flow rate 1590 gpm Annual savings 0 $1,400 $8,300
Head 302.7 ft. Estimated cost $3,800 $4,660 $6,048
Measured power 90.0 kW Payback period   3.3 years 0.73 years

This table shows that a more efficient pump results in major cost savings and a very rapid payback. Using an energy-efficient motor also results in an additional small decrease in energy costs.

PSAT can be downloaded free of charge. Further details on pump selection software are available in our Purchasing Tips section, and a list of other pump selection software is available under Links

Next: Purchasing Tips