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10 Automatic thrust balancing system The patented, Rotoflow system for automatic thrust load control is an active system which maintains the thrust loads well below the thrust bearing capacity. Each thrust bearing is equipped with a special pressure tap that senses thrust-face hydrodynamic oil pressure, which is directly pro- portional to thrust load. The thrust-face pressures from these two opposing thrust bearings are applied to opposite sides of a hydraulic piston, which acti- vates a quick-acting, compensating valve that adjusts the pressure behind the compressor wheel so that the front and back thrust bearing pressures are approximately equal and hence the rotor system is in axial center position. A small bias is built into the system to prevent “hunting”. A unique stiff-shaft design Rotoflow turboexpanders can be built to incorporate a “stiff-shaft” design which ensures that there are no critical speeds through the entire operating range (minimum 20% above the highest operating speed). The shaft is machined from one solid piece of 17-4 PH stainless steel. Each shaft is individually balanced and includes a “shaft runout test”. The Rotoflow turboexpanders run continuously, 24 hours a day at our refinery. There’s never a problem. Doug Bird, BP/Amoco Instrumentation and control Instrumentation systems are designed, fabricated and tested to meet our high quality standards. Solid state controls and annunciators are combined in a reliable, replaceable printed circuit board. Rotoflow turboexpanders can also be configured with customized control systems, using solid state electronic circuitry to ensure safe, reliable machine control. A full choice of sealing systems (atmospheric and pressurized reservoir) Adjustable seals employ a tapered-shaft conical labyrinth seal design. Seal clearance can be maintained by adjusting the axial position of the seal, a procedure not possible with other types of seals.PDF Image | Rotoflow turboexpanders for hydrocarbon applications
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