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Articles

A Better Understanding of Rotor Dynamics and Support Stiffness

More Data Provides More Answers

by Ron Brook

A Business-Based Approach to Developing an Effective Program

by Krzysztof (Kris) Goly

Over the last decade, there has been a general consensus throughout the industry that modern maintenance and plant asset management require the implementation of predictive maintenance techniques. In most instances, predictive technologies are implemented in the form of a Predictive Maintenance (PdM) Program.  PdM programs are designed and implemented through various approaches.  This article presents a business-based approach that has been utilized successfully by Siemens throughout the world and across various industries.

A Closer Look at Air Gap Eccentricity

by Douglas E. Swinskey & Peter M. Bechard

The first step in evaluating test data is understanding the relationship to the circuit's Fault Zones and how abnormalities in a specific Fault Zone affect the performance of the motor. The six Fault Zones (Power Quality, Power Circuit, Stator, Insulation, Rotor, and Air Gap) are derived from the most common electrically related motor failures in industrial environments. The Air Gap Fault Zone describes the measurable distance between the rotor and stator within the motor. Air gap eccentricity is a condition that occurs when a non-uniformity in the air gap between the rotor and stator exists.

 

A Cradle to Grave Approach - Motor Management at Its Best

by Noah Bethel, CMRP

Ask a motor manufacturer how long one of its motors is expected to live, and the response will be something like, "20-plus years in the right environment." Ask the same question in a facility that uses such a motor and the answer is more likely to be, "If we get five years out of it, we'll be happy!" Why does this discrepancy exist? Why do motors die of an infant mortality instead of living to the ripe old age for which they are designed and built? The answer has to do with the failure to optimize motor management and maintenance.

 

A Day in the Life of a Proactive Maintenance Planner

By Ricky Smith and Jerry Wilson

"Without Proactivity in this Process, Chaos Will Dominate"

A Day in the Life of a Proactive Maintenance Supervisor

A Daily Planner for Effective Maintenance Supervision

By Ricky Smith CMRP

Maintenance supervisor updates equipment status and production/operation changes.

A Day In the Life of a Proactive PdM Technician

By: Ricky Smith and Carey Repasz

Beginning of the Maintenance Shift and Unplanned Work:

The day begins with the PdM technician reviewing any equipment that has been repaired or replaced in the past 24 hours. If any equipment has been changed or repaired, the PdM technician will identify specific failure modes for the work completed and conduct follow-up inspections of repairs for the purposes of QA/QC, confirming that the defect has indeed been removed and that no new defects have been introduced as a result of maintenance activity.

A Look into Pulse Theory And Why the Walls of Jericho Fell

An excerpt from the book Vibration Spectrum Analysis by Steve Goldman P.E.

This author has spent many years lecturing to different groups of people who were interested in spectrum analysis for problems ranging from detailed physical tests of cavitation phenomena to philosophical questions about why the walls of Jericho Fell. Often, a very simple explanation involving pulse theory has sufficed to explain some of the observed phenomena. This excerpt is designed to give the reader food for thought rather than quantitative answers.

A New Activity Matrix - Why Being Proactive is No Longer Enough

by Phillip Slater

It was about ten minutes before anyone noticed the smoke. The wiring had been heating up since the most recent planned maintenance activity. Apparently, the electrician didn't quite tighten up the joint and hadn't properly cleaned away the built up dust. The result was a hot joint and this heat quickly spread into the cable. The casing began to smoke and by the time the smoke was noticed the cabinet was actually on fire.

A New Era: Wear Particle Analysis/ Ferrography

By Raymond J. Dalley

Wear particle analysis, or ferrography, is a technique that is growing everyday. With industrial needs for reliability and higher productivity to compete in the world market, techniques such as wear particle analysis become vital in making diagnostic and specific recommendations regarding potential machine problems.

A New Opportunity for the Maintenance Reliability Community

By John S Mitchell

A new term has risen above our horizon. It is being embraced by companies committed to being the best and has great interest and cachet at the highest executive levels. Further, it states a clear objective that must be achieved to remain successful in today's fiercely competitive industry. The question is whether we, the, maintenance reliability community, will embrace the term, recognize its ability to mandate broader activities that are absolutely essential to achieve and sustain real success, and utilize the principles to gain value and results that really matter.

A Proven Electric Motor Regreasing Program

By Jerry S. Honeycutt, Tennessee Valley Authority

One of the most asked questions of grease lubricated motors is, what is the correct interval to regrease the bearings? This is usually followed by two questions, 1) how much grease should be added? and 2) what is the correct method for grease addition?

A Quick Reference For Preparing A Change Management Plan

Change Management is an inherent element to any quality, productivity or improvement project, and represents modifications to the "way of living" inside a Company; as a consequence, it needs to be handled in a strategic manner. During my experience as consultant and key user of many diverse kinds of projects, I have found that there are many useful materials for assisting us in understanding this key responsibility. Nevertheless, most of the time we need to spend a quantity of time and resources to understand and combine this concept with project planning and implementation.

A Shortcut to Higher Efficiency

Adding Short Repairs to PM’s

by Joel Levitt

Have you ever thought about building in short repairs to your PM schedule?

A Tough Diagnosis - The Saga of the Never Ending Problem

by Greg Davison

You are often told that there is never just one problem with a machine. My very first vibration class taught me that a phase and magnitude vector was a combination of all the vibration from all of the forces acting upon the machine. Likewise, a spectrum also contains all of the frequencies from all of the forces acting upon a machine. So, it is never just imbalance, or just misalignment. It is always some combination of many forcing frequencies. This is precisely why wall charts and cookie cutter solutions do not always work. What follows is a story of multiple problems of mythical proportions.

 

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