Paper No. 52
D. R. Smith/G. M. Woodward, Sound & Vibration, June 1988, pp. 24-30.
Vibration data were collected on several large motor-driven vertical cooling water pumps which experienced excessive wear of the impellers, wear rings and seals after a short period of operation. The data indicated that the problem was due to the operating speed being near the pump-motor system mechanical natural frequency, which resulted in excessive vibration levels on the motors and pump impellers. A successful solution to the problem involved increasing the stiffness of the pump mountings.