Machinist at Nickerson Company running a state-of-the-art CNC machine.
Horizontal Lathe
Figure 3. Three phase power has three identical sine waves overlapping at an offset of 2Ļ/3 radians or 120Ā°. When one phase reaches an x-intercept or node the next phase is only 30Ā° and approximately 5.6 milliseconds from reaching its crest.
Frame-mount Centrifugal Pumps
Model 411 Horizontal Split Case
Super T SeriesĀ® Engine Driven
Figure 1. The general arrangement of a three phase waveform.
Submersible Turbine Pumps
Gorman-Rupp SF SeriesĀ® Submersible Solids-handling Pump
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Schlumberger Pump Assembly
Impeller wear ring
Figure 2. A simple sine wave with a period of 360Ā° and an amplitude of 1. In single phase power the x-intercepts are 180Ā° from each other. A full period is 360Ā°. 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.
Close-Coupled Vertical Turbine
National Pump Vertical Turbine Pumps, API 610
“NSF/ANSI 61.”Ā NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
