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Sizing Pumps and Pump Motors

  • July 2021
  • Number of views: 9162
  • Article rating: No rating
Article

Service centers are often called on to provide replacement pumps or pump motors or to advise on pump retrofit and re-application projects. A good understanding of the parameters that govern pump performance is essential to help customers with these opportunities. The information here relates to rotodynamic pumps (centrifugal and axial flow impellers) and not to positive displacement pumps.

Bust Nine Common Motor Myths

Here are the facts about some of the things “they” say about motors and motor performance

  • June 2021
  • Number of views: 6383
  • Article rating: No rating
Trade press article — Efficient Plant

Here’s a random collection of common misconceptions about three-phase squirrel-cage motors and the facts that deny them.

Electric Motor Noise: How to Identify the Cause and Implement a Solution

A methodical approach can narrow down which of the primary sources is to blame: magnetic, mechanical or windage noise

  • May 2021
  • Number of views: 22207
  • Article rating: 3.3
Trade press article — Plant Services

Determining the source of noise in an electric motor is often more challenging than correcting it. A methodical investigative approach, however, can narrow the possibilities and make it easier to resolve the issue—with one caveat. If the noise is due to something in the motor design (e.g., a manufacturing defect or anomaly), a solution may be impossible or impractical.

Best Practices for Electric Motor Storage

Do What You Can To Protect The Investment

  • December 2020
  • Number of views: 15560
  • Article rating: 4.0
Trade press article — Electrical Business

Storing an electric motor for more than a few weeks involves several steps to ensure it will operate properly when needed.  Factors like temperature, humidity and ambient vibration in the storage area also influence the choice of storage methods, some of which may be impractical for smaller machines or need to be reversed before the motor goes into storage.

Advice: Effects of High or Low Voltage on Motor Performance

  • September 2020
  • Number of views: 11615
  • Article rating: 3.3
Trade press article — RV News

To ensure the reliability of an RV’s electrical devices, especially electric motors, campers must know the service voltage of the hookup their RV is using. Teaching consumers to check that before they plug in the vehicle could save them many headaches.

Making Shaft Lift Adjustments in Vertical Turbine Pumps

Best practices for safe operation and easy accessibility.

  • June 2020
  • Number of views: 10053
  • Article rating: 2.5
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.

How Up-Thrust Occurs in Vertical Turbine Pumps and Provisions to Control It

Up-thrust can occur during shutdown or when the pump is operating at flow rates greater than the allowable operating range.

  • June 2020
  • Number of views: 7674
  • Article rating: No rating
Trade press article — Empowering Pumps & Equipment

Vertical turbine pumps depend on the vertical motor's thrust bearings to support the combined weight of the pump rotor and the motor rotor and to counteract the dynamic down-thrust that the pump impellers generate in lifting the liquid.

Why permanent magnet motors and reluctance motors are finding increased industry application

Squirrel cage induction motors should thrive for the foreseeable future, alongside emerging motor technologies that will present exciting opportunities to improve energy efficiency and reliability.

  • June 2020
  • Number of views: 8609
  • Article rating: 2.0
Trade press article — Plant Services

Those familiar with industrial electric motors have heard “DC is dead” for decades as advances in variable-frequency drive (VFD) technology for AC squirrel cage induction motors (SCIMs) seemed destined to replace their DC counterparts in every conceivable application.

But just as DC’s demise was greatly exaggerated, so too is the prospect of successor technologies replacing the installed base of SCIMs any time soon – whether for new applications or replacement motors.

Increasing Motor Reliability

Regularly Checking the Operating Temperature of Critical Motors Will Help Extend Their Life and Prevent Costly, Unexpected Shutdowns

  • February 2020
  • Number of views: 12069
  • Article rating: 5.0
Trade press article — Electrical Business

Regardless of the method used to detect winding temperature, the total, or hot spot, temperature is the real limit; and the lower it is, the better. Don’t let excessive heat kill your motors before their time.

Wear ring clearance for centrifugal pumps

Understand the pump specific speed to help establish proper tolerance

  • June 2019
  • Number of views: 16656
  • Article rating: 2.5
Trade press article — Pumps & Systems

One of the most common repairs on centrifugal pumps is replacing worn or damaged wear rings. To restore efficient, reliable operation and prevent catastrophic pump failure, it is critical to restore proper clearances between the stationary casing wear ring and the rotating impeller wear ring. Although many pump manufacturers provide clearances and dimensions, some do not. There are plenty of aging pumps around from now-defunct manufacturers for which dimension data is simply not available.

In such cases, the rule of thumb that follows provides some guidance for acceptable running clearances, or the minimum running clearance chart in American Petroleum Institute (API) Standard 610 can be used as a guide.

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 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.

VIEW & DOWNLOAD