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.
Bowl wear ring
Model 342A Single Stage End Suction
380 Series Vertical Inline Pump with VFD
Vertical Turbine Pumps, Deep Well
Computer Numerical Control Machine (CNC) at Nickerson
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.
Parley’s Water Treatment Plant. Photo credit SLCdocs.com
Impeller wear ring
Schlumberger Pump Assembly
Horizontal Lathe
SF Series®
Bowl wear ring
“NSF/ANSI 61.” NSF RSS. The Public Health and Safety Organization, n.d. Web. 07 June 2017.
Custom shapes cut from raw materials.
3800 Series, Single Stage End Suction
National Pump Vertical Turbine Pumps, API 610
Model 411 Horizontal Split Case
Impeller wear ring
Frame-mount Centrifugal Pumps
Vertical Lathe
Horizontal Lathe
Figure 1. The general arrangement of a three phase waveform.
