Figure 2. A simple sine wave with a period of 360° and an amplitude of 1. In single phase power the x-intercepts are 180° from each other. A full period is 360°. A single phase motor has a crest approximately every 16.5 milliseconds giving the motors a tendency to vibrate more, which may contribute to a shortened bearing life.
Model 411 Horizontal Split Case
Bowl wear ring
National Pump Vertical Turbine Pumps, API 610
Vertical Turbine Pumps, Deep Well
Ultra V Series® and UltraMate®
Figure 3. Three phase power has three identical sine waves overlapping at an offset of 2π/3 radians or 120°. When one phase reaches an x-intercept or node the next phase is only 30° and approximately 5.6 milliseconds from reaching its crest.
Machinist at Nickerson Company running a state-of-the-art CNC machine.
Custom shapes cut from raw materials.
Nickerson Field Crew
3800 Series, Single Stage End Suction
Close-Coupled Vertical Turbine
Figure 1. The general arrangement of a three phase waveform.
Model 342A Single Stage End Suction
Computer Numerical Control Machine (CNC) at Nickerson
Utah Lake Cascade Pump
Frame-mount Centrifugal Pumps
Computer Numerical Control Machine (CNC) at Nickerson
Bowl wear ring
Submersible Turbine Pumps
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Vertical Lathe
80 Series® Engine Driven
380 Series Vertical Inline Pump with VFD
Impeller wear ring
Horizontal Lathe
CNC machine, where computers are used to control the movement and operation of the mills, lathes, and other cutting tools.
Well Pump Installation
“NSF/ANSI 61.” NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
Vertical Lathe
Gorman-Rupp SF Series® Submersible Solids-handling Pump
