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Single piece radial bearings Two single piece journal type radial bearings are used to sup- port the expander/compressor shaft. This patented, Rotoflow bearing design provides increased wear allowance and nearly nine times the oil film strength of conventional bearings. This exceptional stiffness ensures that oil whirl (half-speed gyration) and oil film resonance do not occur over the entire ope- rating range of speed and flow. The exceptio- nal strength of Rotoflow bearings also means less sensitivity to imbalance and a greater ability to withstand deposits on the wheels, such as ice or solid CO2, and imbalance due to dust accumulation or wear. Tilting pad bearings are also available. Spiral groove thrust bearings Spiral grooves on the thrust bearings produce a strong hydrodynamic effect for high load-bearing capability. The many advantages of magnetic bearings Rotoflow turboexpanders with active magnetic bea- rings offer an alternative to conventional oil bearing systems for many applications. Since they require no lubrication, you won’t need any oil system components, pumps, f ilters, coolers, etc. Also, the risk of process contamination is eliminated. In an expander/compressor with mag- netic bearings, the rotor assembly is supported by active magnetic radial bearings at each end, and a centrali- zed active magnetic thrust bearing. Thrust handling capabilities of Rotoflow turboexpanders with active magnetic bearings are enhanced by an automatic thrust control system. An electronic control system controls the position of the rotor by adjusting current to the electromagnets in response to signals from shaft position sensors. Sensors are combined to automatically cancel rotation signal harmonics, or elliptical or triangular deformation on the rotor surface. Auxiliary Magnetic radial bearing bearings Magnetic thrust bearings Auxiliary bearing 7PDF Image | Rotoflow turboexpanders for hydrocarbon applications
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