両吸込うず巻ポンプの許容配管荷重に関する研究 : 第2報,ポンプケーシングに起因する軸端変位について

抄録

Shaft displacement due to pump 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) and actual measurements were performed and considerable agreement was obtained. Ito was found that shaft displacement due to pump casing deformation can not be neglected in the case of 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 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 galling of casing wearing ring and considerable leakage from mechanical seal caused by piping loads also were investigated.