A Study of Allowable Piping Loads on Double-suction Centrifugal Pumps : 2nd Report, Shaft Displacement Due to Pump Casing Deformation

概要

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Shaft displacement due to dump casing deformation which occurs when external piping forces and moments are applied was investigated. The test pump was an axially split, single-stage double suction volute type with foot support. An analysis by FEM(MSC/NASTRAN) was performed and considerable good agreement was obtained with actual measurement. It was found that shaft displacement due to pump casing deformation can not be neglected for pumps with foot support. In API 610-6th standard, limit of shaft displacement is 0.127 mm for pumps which have suction bores 300 mm or less. But according to this investigation, it is reasonable with pumps having suction bore diameters larger than 300 mm to enlarge this limitation. Effects of pump size and casing thickness on shaft displacement were investigated by FEM. The possibility of a galling of the casing wearing ring and a considerable leakage from mechanical seal caused by piping loads was also investigated.