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How to calculate optimal maintenance intervals

How to calculate optimal maintenance intervals

In a previous article we covered how to perform a detailed Weibull Analysis in Excel. The outputs from a Weibull analysis are important because we can use them for a variety of Reliability calculations such as when to most economically maintain assets.

A common mistake we see made is Reliability Engineers determining the optimal maintenance interval as the MTBF. This is incorrect as it assumes that you will have failed approximately 50-60% of the components before you have maintenance performed on them. (Sounds ridiculous when you say it that way right!?)

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Future of Quality

Future of Quality

Guest Post by Dianna Deeney (first posted on CERM ® RISK INSIGHTS – reposted here with permission)

The current state of the quality profession is affected by shifting business infrastructures and changing definitions of brand quality.

Businesses need to react and change against external pressures like increased frequency of consumer communications, the availability of big data, expanding regulations and standards, and the expectations to innovate quickly. The quality profession is at risk of losing its effectiveness in the overall business operations if it does not proactively change with the business.

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Exemplary Maintenance Leadership

Exemplary Maintenance Leadership

The Backbone of High-Quality Operations

In the world of industrial and manufacturing enterprises, where precision and reliability are paramount, maintenance leadership stands as the unsung hero. Behind the scenes, these individuals and teams are the custodians of high-quality operations, ensuring that machinery hums with efficiency, downtime is minimized, and standards are not just met but exceeded. Let’s take a closer look at the essence of exemplary maintenance leadership and why it’s the cornerstone of a well-oiled operation.

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Kaplan-Meier Estimator for Renewal Processes?

Kaplan-Meier Estimator for Renewal Processes?

The New-Products manager asked me, “Your actuarial failure rate estimates (from vehicle registrations, bills-of-materials, and automotive aftermarket store sales) are for dead-forever parts with at most one failure. What if auto parts could be renewed or replaced more than once?” Chagrined, I wrote a spreadsheet program to estimate actuarial rates for renewal processes, without life data. But what is the corresponding estimator from grouped, cohort renewal counts like the Kaplan-Meier estimator for grouped, cohort failure counts?

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Ten Books About One Failure Mode

Ten Books About One Failure Mode

Failure of Ship Hulls Due to Rot

British oak forests provided the wood to build the fleets that fought the Seven Years’ War, American Revolutionary War, French Revolution, and the Napoleonic Wars. New trees had to mature for 80-120 years for shipbuilding. By the early 1800s, three-quarters of British oak forests had been harvested to fight a half century of naval wars. Additionally, a scourge of dry rot reduced the service life of Britain’s main battle ships from the historical 25 years to less than 7 years. Britain had a severe national security problem – the Timber Crisis.

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What’s in a Heading? Five Writing Tips to Make Your Text More Accessible

What’s in a Heading? Five Writing Tips to Make Your Text More Accessible

Headings are vital in improving accessibility for vision-impaired individuals by providing structure, navigation, and context. Headings make content more understandable and usable for those who rely on screen readers and other assistive technologies when used correctly.

Good Practices

It’s essential to follow good practices to create accessible text with headings.

1. Use Semantic HTML Element

Use proper HTML headings (<h1>, <h2>, etc.) to create a hierarchical structure. Avoid using other formatting (e.g., bold text) as a substitute for headings.

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When Will my Equipment Reach its End-of-Life State? – It Depends…

When Will my Equipment Reach its End-of-Life State? – It Depends…

End-of-life definition

Operators need to estimate when in the future their equipment will attain their end-of-life state. Obsolescence is another word for equipment end-of life. Once they reach this stage, equipment replacement often leads to significant budgetary expenditures. In addition, if the operation has a large number of a particular equipment types, they could all reach their end-of life at the same time leading to even greater financial impact. In industry jargon, this is known as the “Tsunami” effect. Operators need to aware and prepared in order to avoid this “wave” of consequences. Managing future cash inflow and outflows happens to be crucial financial exercise in any organization. Therefore, end-of-life management in an important financial accounting exercise. However, estimating end of life this is not always as straightforward as it seems.

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What is Conscious Reliability® all about?

What is Conscious Reliability® all about?

Article first posted at Conscious Reliability by James Reyes-Picknell, Jesus Sifonte, and team.

How it all got started

About two years ago Jesus Sifonte, CMMI, invited James Reyes-Picknell to be a speaker at a congress that he was holding in San Juan, Puerto Rico. They did not know each other, nor did they even know much about each other. They were recommended to each other by a mutual friend. At the congress, they presented their respective topics and in the evenings shared a few drinks and spoke about maintenance, reliability and asset management. They realized that they both had a shared passion for excellence and we learned about each-others’ experience.

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Don’t Get Caught Without Your Business Continuity Plans, Again

Don’t Get Caught Without Your Business Continuity Plans, Again

Guest Post by Patrick Ow (first posted on CERM ® RISK INSIGHTS – reposted here with permission)

When the COVID pandemic stuck in March 2020, many organisations struggled with business continuity. Many were caught out without business continuity strategies or plans to overcome the likely business disruption that was brought about by COVID.

Having worked with organisations on their business continuity planning, the key challenge many organisations face in developing their business continuity strategies and plans is the level of business continuity planning and effort required. Many business continuity consultants have adopted the ISO 22301 Business continuity management systems — Requirements approach and have unfortunately over-engineered the approach as a one-size-fits-all.

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 How Your Condition Monitoring Program Will Fail 

 How Your Condition Monitoring Program Will Fail 

 and Probably Already Has 

 Predictive Maintenance strategy uses condition monitoring techniques to observe plant and equipment health. Based on the equipment’s condition you plan, schedule and perform any necessary maintenance before the breakdown. To use Predictive Maintenance most successfully you must set-up and run your condition monitoring program correctly all the time—predictive maintenance is a never ending strategy that if not done right at every step will still lead to plant and equipment failures. Learn about the many ways your predictive maintenance program will fail and you won’t even know about it! 

Keywords: predictive maintenance, condition monitoring, Con Mon

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