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Sep 30, It does not dictate the number of wear rings or bushings.
In certain circumstances such as high suction pressures with OH2 pumps, only one wear ring (on the impeller eye side) might be fitted to help balance axial thrust. API notes the optional nature of throat bushings in BTW, the current edition of API is 11th edition.
Dec 18, (b) Throat bushing to shaft fit is to be ”” clearance (c) Throat bushing to shaft fits of inline pumps (depending on shaft size) where the throat bushings may act as intermediate bearings, will have clearances ranging from ” to ” Weld overlays can be substituted for metallic impeller wear rings. Clearance between impeller disc vanes and stuffing box housing: in.
Clearance between shaft sleeve and throat bushing: in. diametral. (max ″) E. Field reassembly 1. Back out pusher screws and bolt distance piece to casing. Make sure proper gasket is placed in between.
2. Replace foot support bolts. 3. Reconnect all. Dec 17, A common component in both of these specifications is the so-called throat bushing, which is defined as:"A device that forms a restrictively close clearance around the sleeve (or shaft) between the (inner) seal and the impeller." The throat bushing can form a primary interface between the pump and the mechanical seal.
Understanding which parameter settings are most often programmed by VFD installers.
THROAT BUSHING tion by running dry until pump dis- charge flow is established. At one installation, the engineer estimated that it would take more than five minutes for the pumpage to reach the surface discharge from lower water level. GRAPHALLOY survived this duration with margin to spare. GRAPHALLOY THROAT BUSHING GRAPHALLOY INTERSTAGE BUSHING. If you have upgraded the wear rings to Vespel CR, reduce the clearance of the throttle and center bushing to be ” ( mm) less than the wear ring clearance.
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Otherwise, keep the original design clearance. Make sure the pump overhaul results in good rotor concentricity. (The rotor should turn freely after assembly. In many applications, Weir Minerals said in a recent bulletin, that the pump’s throat bushing, or throatbush, is the component that has the shortest life compared to the impeller and liners with considerable variability. Adjusting the gap between the throatbush and the impeller front shroud reduces hydraulic recirculation in the pump.