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Axial Thrust in Rotodynamic (Centrifugal) Pumps

  • February 2024
  • Number of views: 702
  • Article rating: No rating
Webinar recording

When repairing centrifugal and axial flow pumps, axial thrust is a concern. An understanding of the causes and the mitigating provisions of various pump designs will help repair technicians to ensure those provisions work properly.

Common Causes of Surface Damage in Pump Impellers

  • March 2023
  • Number of views: 3025
  • Article rating: 4.0

It’s common to find pump impellers with significant surface damage. The three most common causes of surface damage are erosion, corrosion and cavitation. For each of these there are characteristics which will help indicate the primary cause of the damage.

Causas Comunes del Daño en la Superficie de los Impulsores de las Bombas

  • March 2023
  • Number of views: 3477
  • Article rating: 5.0

Es común encontrar impulsores de bombas con daños significativos en la superficie. Las tres causas más comunes de daño superficial son la erosión, la corrosión y la cavitación. La apariencia del daño en las superficies del impulsor refleja las características de cada uno de estos tres fenómenos.

Repairing Corrosion and Erosion Damage on Pumps

  • May 2022
  • Number of views: 4561
  • Article rating: 2.0

Corrosion and/or erosion damage is inevitable for some pump applications. Pumps received for repair with significant damage may look like a candidate for the junk bin, but with proper repair techniques can often be restored to original performance – or perhaps better than original.

Reparando Daños por Corrosión y Erosión en Bombas

  • May 2022
  • Number of views: 3809
  • Article rating: No rating

En algunas aplicaciones, los daños por corrosión y/o erosión de las bombas son inevitables. Las bombas enviadas para reparación que presentan daños significativos pueden parecer buenas candidatas para ser desechadas, pero a menudo con las técnicas de reparación adecuadas pueden restaurarse a sus condiciones originales o quizás a unas mejores.

Dynamic Balancing on Pump Impellers

  • February 2021
  • Number of views: 12714
  • Article rating: 1.7

As with most other machines commonly repaired in EASA service centers, dynamic balancing on pump impellers is an important concern. Excessive imbalance imparts forces on bearings, reducing their lives and subjecting machine mountings to vibratory energy that deteriorates foundations.

Balanceo Dinámico de los Impulsores de las Bombas

  • February 2021
  • Number of views: 11238
  • Article rating: 2.6

Al igual que con la mayoría de las otras máquinas reparadas comúnmente en los centros de servicio de EASA, el balanceo dinámico de los impulsores de las bombas es una cuestión importante. El desbalanceo excesivo imparte fuerzas sobre los rodamientos, reduciendo su vida útil y sometiendo los soportes de las máquinas a una energía vibratoria que deteriora las fundaciones.

Determining Impeller Trim Diameters for Pump Re-Applications

  • June 2020
  • Number of views: 7625
  • Article rating: No rating
FREE for Members of EASA
Convention presentation

Whether it is a simple re-application of a pump from 50 Hz to 60 Hz (or vice versa), the repurposing of an existing pump, or the application of a new pump to an existing application, determining the proper trim for an impeller can be challenging.

Why Pumps Fail

  • June 2020
  • Number of views: 11151
  • Article rating: No rating
FREE for Members of EASA
Convention presentation

Centrifugal pump failures are most commonly attributed to seal failure, impeller damage and bearing failures. A good understanding of failure modes for seals, impellers and bearings is essential to providing customers with reliable pump repairs.

Pump Repairs and Procedures

  • April 2020
  • Number of views: 11521
  • Article rating: No rating
Webinar recording bundle

A special discounted collection of 8 webinar recordings focusing on various aspects of pump repair.

Just $40 for EASA members!

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



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.


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.



EASA Technical Manual

EASA Technical Manual cover

Revised September 2022
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.