PASSIVE ACTUATOR FOR SUPPRESSING A VIBRATION OF A COLUMN PIPE OF A VERTICAL PUMP, VERTICAL PUMP AND METHOD OF RETROFITTING A VERTICAL PUMP

摘要

A passive actuator for suppressing vibration of a column pipe of a vertical pump, the actuator being mounted between the column pipe of the vertical pump and a canister surrounding the column pipe. The passive actuator includes a first operational state for adding stiffness between the canister and the column pipe and a second operational state for at least reducing the stiffness. The passive actuator includes passive actuator elements, each of which automatically changes from the second operational state to the first operational state when the temperature of the passive actuator element changes from a second to a first temperature, the first temperature being different from the second temperature, and to automatically change from the first operational state to the second operational state, when the temperature of the passive actuator element changes from the first temperature to the second temperature.