Open Search

How up-thrust occurs and provisions to control it in vertical turbine pumps

Publication date: 
October 2019
By Gene Vogel EASA Pump & Vibration Specialist
Type of media: 

Vertical turbine pumps (VTP) are driven by vertical motors with large thrust bearings that support the weight of the motor rotor, the pump rotor and the dynamic down-thrust generated by the pump impellers as they lift the liquid. The weight of the motor rotor and pump rotor are easily determined from simple engineering data. The amount of thrust generated by the impellers as they interact with the moving liquid is much more complicated, and the thrust is not always generated in the downward direction.