Three screw pumps are commonly used for machinery lubrication; hydraulic elevators; fuel oil transport and burner service; powering hydraulic machinery; in refinery processes for high temperature viscous products such as asphalt‚ vacuum tower bottoms and residual fuel oils; in crude oil pipeline service and gathering‚ boosting and loading barges and ships. These pumps are common in engine rooms on most of the world's commercial marine vessels and many combat ships.
Three screw pumps are also used for polymer pumping in the manufacture of synthetic fibers such as nylon and lycra. Designs are available in sealless configurations such as magnetic drives and canned arrangements. The magnetic drive is used extensively for pumping isocyanate‚ a plastic component which is an extremely difficult fluid to seal using conventional technology.
The pumps are self-priming‚ highly efficient‚ low noise and well-matched for use with variable speed drives (frequency converters). Liquid is moved continuously‚ virtually without pulsations‚ turbulence‚ crushing‚ or loss of lubrication.
The spindles of three screw pumps are specially shaped to create sealed chambers. And even with the continuous axial rotation of the spindles‚ no turbulence results. The uniform chamber volumes eliminate crushing forces. Contactless and non-slip torque transfer greatly extends maintenance intervals and significantly increases the MTBF.
Advantages of Three-Screw Pumps:
- High Speed
- Low Operating Noise
- High Thermal Resistance
- Wide Viscosity Range
- Nearly No Pulsation
- Low Wear
- Flow Control Via Speed Regulation
- High Efficiency