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Making Shaft Lift Adjustments in Vertical Turbine Pumps

Best practices for safe operation and easy accessibility.

  • June 2020
  • Number of views: 2928
  • Article rating: No rating
Trade press article — Pumps & Systems

Vertical turbine pumps (VTP) commonly have rotors with multiple mixed-flow impellers (sometimes 12 or more) that are supported by a vertical pump motor. Such designs offer a lift adjustment for raising or lowering the pump rotor to properly position the impellers within the bowl. Depending on the type of pump, this may be critical for maximizing pump efficiency and could have a significant impact on motor load (current) and reliability.

The Pump Repair Option for Service Centers

  • February 2020
  • Number of views: 1803
  • Article rating: No rating
Article

EASA service centers looking for options for expansion, or to replace evaporating existing electric motor repair markets, have seen pump repair as a good fit. A majority of EASA service centers currently repair roto-dynamic pumps. Pumps are by far the largest category of machines driven by electric motors. If a service center is repairing electric motors, then it is almost certain that some of those motors are driving pumps, and the prospects for pump repair are its existing customers.

La Opción para la Reparación de Bombas en los Centros de Servicio

  • February 2020
  • Number of views: 1547
  • Article rating: 5.0
Article

Los centros de servicio miembros de EASA que buscan expandirse o que estén interesados en reemplazar los mercados de reparación volátiles existentes, han visto en la reparación de las bombas algo idóneo. Por lo general, la mayoría de los mismos repara bombas roto-dinámicas. Por mucho, las bombas son la categoría más grande de máquinas accionadas por motores eléctricos.

Como ocurre el empuje hacia arriba en las bombas de turbina verticales y disposiciones para controlarlo

  • October 2019
  • Number of views: 2081
  • Article rating: 5.0
Article

Las bombas de turbina verticales (VTP) son accionadas por motores verticales provistos con grandes rodamientos de empuje que soportan el peso del rotor del motor, el rotor de la bomba y el empuje dinámico hacia abajo, producido por los impulsores cuando levantan el líquido. El peso del rotor del motor y del rotor de la bomba se determinan fácilmente a partir de datos de ingeniería simples. El cálculo del empuje producido por los impulsores cuando interactúan con el líquido en movimiento es mucho más difícil y no siempre el empuje es generado hacia abajo.

En este artículo revisemos brevemente cómo se produce el empuje hacia arriba en las bombas y las disposiciones en los motores VTP diseñados para controlarlo.

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

  • October 2019
  • Number of views: 2060
  • Article rating: No rating
Article

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. This article looks at how up-thrust occurs and the provisions to control it.

Vertical Turbine Pump Shaft & Bearing Types, Fits and Clearance

  • November 2018
  • Number of views: 3582
  • Article rating: 4.0
Webinar recording

This presentation covers:

  • Shaft material and specs
  • Shaft coupling types
  • Machining for shafts
  • Bronze, plastic, graphite and cutlass bearing options
  • Bearing clearance concerns and reference data 
  • Bearing housing fits

Best practices for vertical turbine pump repair

Learn warning signs of needed repairs and avoid common mistakes

  • June 2018
  • Number of views: 3532
  • Article rating: 3.0
Trade press article — Pumps & Systems

Vertical turbine pumps (VTPs) are workhorses in the petrochemical, power generation and manufacturing industries, and prolific in municipal water applications that handle the primary intake load. Although these machines are ruggedly built, abrasive sediments in the pumpage take a toll, particularly on line shaft and pump bowl bearings, so periodic overhauls are often necessary. Rather than simply replacing the bearings, however, it is important that repairs address all of the issues needed to restore maximum operating life.

Making vertical turbine pump shaft adjustments

  • December 2015
  • Number of views: 1834
  • Article rating: 5.0
Article

It is common for vertical turbine pumps (VTP) to be designed with multiple mixed flow impellers (sometimes 12 or more) and for the pump rotor to be supported by the vertical pump motor. Vertical pump motors can be solid shaft or hollow shaft. In either case, there is an adjustment that lifts the pump rotor so it is supported by the motor shaft. This adjustment is obviously critical to the proper operation of the pump and motor and can have a significant effect on the motor load (current). Presented here are some of the main concerns for setting this pump lift adjustment.

Realizando los ajustes en la elevación del eje de una bomba de turbina vertical

  • December 2015
  • Number of views: 1994
  • Article rating: 5.0
Article

Es común que las bombas de turbina vertical (VTP) se encuentren diseñadas con varios impulsores de flujo mixto (algunas veces 12 o más) y que los rotores de las bombas estén soportados por los motores verticales. Los motores de las bombas verticales pueden ser de eje macizo o hueco. Los motores de eje macizo tienen una cuña o chaveta anular (en forma de anillo) en el eje, para asegurar un acoplamiento sólido que soporta el rotor de la bomba. Los motores de eje hueco soportan y accionan el rotor de la bomba desde la parte superior, mediante un cabezal de eje que está asegurado al eje lineal intermedio (line shaft) a través del eje hueco del motor. En cualquiera de los casos, existe un ajuste que eleva el rotor de la bomba para que quede soportado por el eje del motor. Obviamente este ajuste es crítico para el funcionamiento adecuado de la bomba y el motor y puede llegar a tener un efecto significativo en la carga del motor (consumo de corriente en amperios). En este artículo se presentan algunos puntos importantes para ajustar la elevación del eje de la bomba. 

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations

LEARN MORE AND DOWNLOAD MÁS INFORMACIÓN Y DESCARGAR BUY PRINTED COPIES

READ MORE ABOUT THE FEATURES AND BENEFITS

EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

DOWNLOAD THE FULL RESULTS

ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

DOWNLOAD - ENGLISH

DESCARGAR - ESPAÑOL

EASA Technical Manual

EASA Technical Manual cover

Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

VIEW & DOWNLOAD