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

  • October 2019
  • Number of views: 6742
  • Article rating: 4.5

Gene Vogel
EASA Pump & Vibration Specialist

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.

During certain stages of pump operation, the flow of the liquid through the impellers can generate an upward thrust that can lift the pump rotating assembly. The resulting upward force can cause havoc with thrust bearings in the motor which may be designed to handle only down-thrust. 

This article will briefly review how pump up-thrust occurs and the provisions of VTP motors designed to control it.

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 2: Mechanical repair

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 8: Bearings

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 10: Bearings & Lubrication

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 10: Bearings & Lubrication

Root Cause Failure Analysis
  • Section 2: Bearing Failures
  • Section 5: Rotor Failures

Mechanical Repair Fundamentals of Electric Motors
  • Section 5: Bearings
  • Section 15: Failures in Mechanical Components

Fundamentals of Pump Repair
  • Section 4: Vertical Turbine Pumps

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Categories: Bearings, Pumps
Tags: Vertical turbine pumps
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