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MTBF free Availability

MTBF free Availability

The classic formula for availability is MTBF divided by MTBF plus MTTF. Standard. And pretty much wrong most of the time.

Recently, working for a bottling plant design team, we pursued design options to improve the availability and throughput of the new line. The equipment would remain the same: filler, capper, labeler, etc. So we decided to gather the last six months or so of operating data, which included up and down time. Furthermore, the data included time to failure and time to repair information.

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Is MTBF a True, Beneficial, and Timely Metric

Is MTBF a True, Beneficial, and Timely Metric

How Good is MTBF as a Metric?

Let’s look at the characteristics of a sound reliability metric and how MTBF is not true or beneficial. A metric should be true, beneficial, and timely. We’ll start with a rock climbing analogy.

A bolted hanger along a rock climbing route is often a welcome site. It provides the climber safety (clipping the rope to the bolt), direction (this is the way), and confidence. Does MTBF as a metric do the same for your organization?

As climbers, we count on the bolts to provide support in case something goes wrong or we need to rest along the route.

A reliability metric is often used in the same way as a climbing bolt. The measure, whether MTBF, Reliability, or Failure Rate, assures that the product’s reliability performance is as expected.

The organization’s profits are or will be safe. The development team uses the measures to guide design and supply chain decisions. The measure provides confidence to the organization regarding meeting customer expectations around reliability.

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Why You Should Avoid MTBF

Why You Should Avoid MTBF

Why You Should Avoid MTBF

podcast episode with speaker Fred Schenkelberg

In the past two months, I’ve received a few questions concerning why I recommend avoiding using MTBF or similar metrics. I’m also moving the articles I and others wrote on the topic from NoMTBF.com to Accendo Reliability. So, the topic of MTBF has been on my mind.

This morning’s email included a question on why I was so against using MTBF. This event is my answer. [Read more…]

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Why You Should Avoid MTBF

Why You Should Avoid MTBF

An Accendo Reliability recorded webinar event

In the past two months, I’ve received a few questions concerning why I recommend avoiding using MTBF or similar metrics. I’m also moving the articles I and others wrote on the topic from NoMTBF.com to Accendo Reliability. So, the topic of MTBF has been on my mind.

This morning’s email included a question on why I was so against using MTBF. This event is my answer.

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How Do I Do MTBF Testing?

How Do I Do MTBF Testing?

An Accendo Reliability recorded webinar event

First thing … the MTBF is not a reliability metric (other webinars explain why!) But there are many times when (for reasons good and bad) we need to test something to see how often it fails. This can help us determine how many spare parts we need, how many maintainers and technicians we need to employ, and many other really useful (typically logistic) considerations. We sometimes also need to be able to work out if a product meets an MTBF requirement. But when we do … we need to take into all sorts of statistical considerations like producer’s risk, consumer’s risk, and discrimination ratio. Shouldn’t the requirement be the requirement? If you want to learn more about MTBF testing and how it might (or might not) work … then join us for this webinar.

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How Do I Do MTBF Testing?

How Do I Do MTBF Testing?

How Do I Do MTBF Testing?

podcast episode with speaker Chris Jackson

First thing … the MTBF is not a reliability metric (other webinars explain why!) But there are many times when (for reasons good and bad) we need to test something to see how often it fails. This can help us determine how many spare parts we need, how many maintainers and technicians we need to employ, and many other really useful (typically logistic) considerations. We sometimes also need to be able to work out if a product meets an MTBF requirement. But when we do … we need to take into all sorts of statistical considerations like producer’s risk, consumer’s risk, and discrimination ratio. Shouldn’t the requirement be the requirement? If you want to learn more about MTBF testing and how it might (or might not) work … then join us for this webinar.

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307 – The Evil Ways of MTBF with Fred Schenkelberg

307 – The Evil Ways of MTBF with Fred Schenkelberg

The Evil Ways of MTBF with Fred Schenkelberg

It’s my pleasure to welcome Fred Schenkelberg back to the podcast. He is a reliability engineer and management consultant.

In this episode we covered:

  • What is MTBF?
  • Why would people want to calculate what that average time between failure is or where did this come about?
  • What do you think about using MTBF to monitor a complex systems reliability, and using that to pro proactively look at reviewing the maintenance program to it?

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MTBF versus Useful Life

MTBF versus Useful Life

There’s a big difference between MTBF and Useful Life. The two values are often misunderstood and misapplied when assigning Preventive Maintenance task intervals. In this video, I’ll explain which one is used to assign intervals for Scheduled Replacement and Scheduled Restoration tasks. We’ll also discuss Operating Context and how that can affect Manufacturer Recommended Maintenance. This is an “edutainment” video. If you’d like to skip the fun stuff (although I don’t know why you’d want to ☺️), I’ve time stamped the Reliability Moments below. Enjoy!

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What to Do About MTBF Use

What to Do About MTBF Use

What to Do About MTBF Use

podcast episode with speaker Fred Schenkelberg

While the NoMTBF movement is progressing, we still find those who want to use MTBF (or MTTF). As you know, MTxx-type metrics are means. They contain little information and are generally misunderstood and misused. So, what should a well-educated practitioner do? [Read more…]