Transcription of Two screw pumps - Warren Pumps
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Two screw pumps - Warren Pumps
Reprint from PetroMin October Issue 1994In multiple screw Pumps , each wrap of screw threadeffectively forms a stage of pressure capability. Highpressure Pumps have 5 to 12 stages or wraps, whereaslow pressure Pumps may have only 2 or 3 wraps. Thepresure capability of a two screw pump, for example,is illustrated in Figure 1. 90 degrees from the plane of the the axial direction, discharge pressure acts on the exposedcenter areas of each screw set. Because the diameters and leadangles of the opposed screw sets are equal, hydrostatic forcesacting to the left are equal to those acting to the right. The net axialforce due to discharge pressure is zero and the screw shafts are screw pumpsThe two screw type pump normally uses timing gears outside ofthe pumped liquid to synchronize the mesh of the non-contacting screws. The most common arrangement is opposedhelices (double suction) with the flow pattern being from theends of the screw sets to the center of the pump, Figure each wrap of thread, the stage pressure acts on allexposed areas.
equation: d = ∑F x L3 I c / x E x I where ∑F is the summation of the hydraulic forces, L is the bearing span, c is a constant, E is the shaft material
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