While predictive and preventive maintenance activities are useful in preventing failures, they do not permanently eliminate the defects inherent in an asset that allow the deterioration leading to the failure. On the other hand, it is possible to modify the asset in a manner that eliminates the defects.

Frequently, defects are embedded in an asset after the initial design as a result of oversight or lack of understanding. On other occasions, the presence of defects is the result of economics. In these cases, the designer knows of the defect, but is unable to take steps needed to eliminate the defects while still maintaining the final cost or profitability of the asset at an acceptable level.

In the second situation, it should be hoped and expected that the OEM has shared the knowledge of the defect with the future owners. With that knowledge, the owner could make one of two choices:

  • Pay a little more for the asset and eliminate the defect.
  • Perform the appropriate predictive and preventive maintenance while living with the defect, yet still avoiding failures.

In the frequent situations where either designers did not know about inherent defects or knew of their existence and failed to report them to the future owner, the task of finding and eliminating the defect is up to the owner.

In the case where the owner must deal with an inherent defect, the owner has the same choices to make as did the OEM. The owner can either spend the money to make the asset more robust and permanently eliminate the asset’s susceptibility to a specific failure mechanism or, if that is not an economic choice, deal with the ongoing deterioration.

Some defects are relatively simple and straightforward, like the use of an alloy that will withstand various forms of corrosion as a replacement for carbon steel. Other forms of defect elimination are not so simple. An example is a defect in software that allows specific forms of malfunction in certain infrequent circumstances. In either case, it is important to be certain that the changes made to eliminate the defects do not do more harm than good.

Tip from Critical Connections - Linking Failure Modes and Failure Mechanisms to Predictive and Preventive Maintenance by Daniel Daley

About this title

As the title of this book implies, the objective is to describe the links between failure modes, failure mechanisms, predictive maintenance and preventive maintenance. As you might expect, a clear understanding of the links between those elements is based on a clear understanding of the definitions for those elements. It is possible, and even likely, that you will find other sources that apply somewhat different definitions to these terms.

It is my experience that despite the source of the operative definitions, the mental images being used by participants tend to vary and are, therefore, inadequately defined. It is not so much what is written on paper as what is inside your head that counts. Much of the effort of this book is to place an operative definition in the minds of readers that is clear, understandable and easily shared with others.

Now available on Amazon

Upcoming Events

August 9 - August 11 2022

MaximoWorld 2022

View all Events
banner
80% of Reliabilityweb.com newsletter subscribers report finding something used to improve their jobs on a regular basis.
Subscribers get exclusive content. Just released...MRO Best Practices Special Report - a $399 value!
DOWNLOAD NOW
“Steel-ing” Reliability in Alabama

A joint venture between two of the world’s largest steel companies inspired innovative approaches to maintenance reliability that incorporate the tools, technology and techniques of today. This article takes you on their journey.

Three Things You Need to Know About Capital Project Prioritization

“Why do you think these two projects rank so much higher in this method than the first method?” the facilitator asked the director of reliability.

What Is Industrial Maintenance as a Service?

Industrial maintenance as a service (#imaas) transfers the digital and/or manual management of maintenance and industrial operations from machine users to machine manufacturers (OEMs), while improving it considerably.

Three Things You Need to Know About Criticality Analysis

When it comes to criticality analysis, there are three key factors must be emphasized.

Turning the Oil Tanker

This article highlights the hidden trap of performance management systems.

Optimizing Value From Physical Assets

There are ever-increasing opportunities to create new and sustainable value in asset-intensive organizations through enhanced use of technology.

Conducting Asset Criticality Assessment for Better Maintenance Strategy and Techniques

Conducting an asset criticality assessment (ACA) is the first step in maintaining the assets properly. This article addresses the best maintenance strategy for assets by using ACA techniques.

Harmonizing PMs

Maintenance reliability is, of course, an essential part of any successful business that wants to remain successful. It includes the three PMs: predictive, preventive and proactive maintenance.

How an Edge IoT Platform Increases Efficiency, Availability and Productivity

Within four years, more than 30 per cent of businesses and organizations will include edge computing in their cloud deployments to address bandwidth bottlenecks, reduce latency, and process data for decision support in real-time.

MaximoWorld 2022

The world's largest conference for IBM Maximo users, IBM Executives, IBM Maximo Partners and Services with Uptime Elements Reliability Framework and Asset Management System is being held Aug 8-11, 2022