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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. They 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.
Three screw pumps are capable of water injection services (Tritec) as well as high pressure coolant service for machine tools (Emtec).
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.
Flow rates are available from 1 to 3300 GPM (4 to 13,250 L/M) or for operating pressures to 4500 PSIG (310 BAR).
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:
• Self-Priming
• High Speed
• Low Operating Noise
• High Thermal Resistance
• Wide Viscosity Range
• Nearly No Pulsation
• Low Wear
• Flow Control Via Speed Regulation
• High Efficiency |
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Allweiler
/ Imo
/ Imo AB
/ Tushaco
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Overview