Fundamentals of Life Estimation

podcast episode with speaker Fred Schenkelberg

We often face questions, such as: “How long will this last?”, “Will this design survive for at least 5 years?”, and “When should we recommend servicing or replacement?” Being able to provide life estimates is a common skill we need to master.

Life testing is not the only method available to us. We can provide a guess (based on engineering judgement), to modeling and simulation, to field data analysis. And, there are more suitable methods depending on the particular situation.

Let’s explore the range of options available to estimate life for an item, plus the pros and cons of each method. You need to be aware of your options and thus be able to provide the best estimates when asked.

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Fundamentals of Environmental Testing

podcast episode with speaker Fred Schenkelberg

One of the elements of reliability concerns where and how the product will be used. This includes understanding the environmental stresses (such as wind, insects, and temperature) as well as the product’s handling, usage frequency, throughput, and other relevant factors.

In some cases, we need to evaluate our product’s ability to survive the expected environmental stresses. Conducted well, this testing will provide vital information to the design team about the product’s capabilities. It also may reveal design weaknesses.

Let’s explore when and how to identify which types of environmental testing should be done. The intent is to conduct specific environmental tests that will provide value to the organization and its customers. Doing any environmental test just because we can is not a valid reason to do so.

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What is Reliability?

podcast episode with speaker Chris Jackson

Everyone knows what reliability is. And that’s the problem. We have used the term ‘reliability’ in normal, everyday speech since we were children. So that means we have decades of preconceived ideas about what reliability is (and is not). But that means there are lots of different ideas about what reliability is. Some people think this thing called the ‘MTBF’ is a measure of reliability (it isn’t). And neither is the ‘failure rate.’ Neither are things called the ‘L10’ and ‘B10’ lives. So if you want to find out what reliability actually is (no equations) … this webinar is for you!
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Fundamentals of Success Testing

podcast episode with speaker Fred Schenkelberg

Product life testing is expensive. Thus, many seek ways to minimize the cost. Two common methods is to use the fewest samples that may lead to a meaningful result, and using acceleration methods to shorten test times. Designing a test based on the pass/fail (binomial distribution) approach provides a path to using very few samples, providing a clear pass/fail result, and is relatively risky.

Let’s examine the success testing approach, the assumptions, benefits and faults. Plus, what other options you may have available to get the information concerning expected product/component life. Knowing the details of success testing enables you to use it when it’s appropriate and when to avoid its use.

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What is Accelerated Life Testing (ALT)?

podcast episode with speaker Chris Jackson

Well … it’s all in the name … isn’t it. Or is it? Do you know what the difference is between Highly Accelerated Life Testing or Accelerated Life Testing? Do you know what an ‘acceleration factor’ is? Do you know what a ‘failure mechanism’ is? If the answer is no … this webinar will help. Or perhaps you want to estimate the reliability of something that is supposed to last a long time, but don’t have a lot of time to test. Then this webinar can help. Or perhaps all this is good … but you’re scared of complicated equations. Again … this webinar can help!
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Engineering Framework to Assess Equipment Reliability of Air Fin Coolers in Process Plant Industries

podcast episode with guest speaker Dheerajkumar Narang

Air fin coolers are one of the most important assets in process plant facilities for ensuring continued operational excellence and production rate of the process plant. There are numerous remaining life assessment (RLA) and reliability engineering (RE) methodologies available for performing condition assessment of the air fin coolers. Most methodologies concentrate on the mechanical integrity (MI) aspects of air fin coolers such as the header box and fin tubes life assessment using recognized and generally accepted good engineering practices (RAGAGEP) to primarily address the loss of containment (process fluid) scenarios. There is rarely a comprehensive methodology or framework that also covers the dynamic parts such as fin blades, electrical motor, gear box and propeller (fan) in assessing remaining life of the air fin coolers. This article will outline a thorough reliability engineering or remaining life assessment framework (holistic methodology) that will cover both the mechanical integrity (header box and fin tubes) and reliability aspects (fin blades, electrical motor, gear box and propeller) aspects enabling the asset integrity (reliability & maintenance) engineering personnel to generate a technical, coherent, and auditable reliability report for the air fin coolers. This technical webinar is based on a poster session that was originally presented at the 2024 AiCHE Spring Meeting and 20th Global Congress on Process Safety, New Orleans, LA.
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The MTBF Sucks. Here’s Why.

podcast episode with speaker Chris Jackson

Ever heard of the MTBF? A lot of people have. But not many people (truly) understand what it is. For example, is it possible for one product with a larger (better) MTBF to have more warranty failures than another product with a smaller (worse) MTBF? A lot of people think not. But it actually is. And not in just some weird, once in a lifetime sort of way. Lots of products with larger (better) MTBFs fail more often than those with smaller (worse) MTBFs. Confused? This webinar will help!
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Fundamentals of Derating

podcast episode with speaker Fred Schenkelberg

This one is for those involved with the design of electronics. Clustering a few standard components is a standard way to bring functionality to your product, yet considering how those components may fail is important to create a robust and reliability product.

Derating is the method of selecting components with sufficient rating to withstand variations in stress(es) they may experience. Let’s explore why derating is important, the difference it can make, and a few methods to implement derating with your design team.

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What is Weibull Probability Plotting?

podcast episode with speaker Chris Jackson

Weibull probability plotting is perhaps the most widespread data analysis tool used in reliability and quality engineering. Some of you might have used it. Some of you might know that it ‘magically’ creates straight lines out of failure data, and the slope and location of that straight line … sort of means something. Good reliability engineers know what these straight lines mean, what it means if the lines aren’t straight, can do things like look at these lines to optimize maintenance regimes, work out if we quality control issues (or not), and lots of other things. And the good news is … if you know how to use Weibull probability plotting – you don’t need to use complex equations!
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Linking Customer Needs to Product Requirements and Robust Design

podcast episode with speaker Rob Allen

Reliability engineers should have a clear understanding of how customer needs link to product requirements. Product requirements that have the most impact on customer needs should be considered in your design failure modes and effects analysis (DFMEA). This webinar will review the quality function deployment methodology (QFD), which identifies critical-to-quality (CTQ) requirements and supports requirements validation. We will also cover how the relative importance of CTQs can be used to determine DFMEA severity criteria.
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What are ‘Cut Sets’?

podcast episode with speaker Chris Jackson

Reliability engineers are often taught about ‘cut sets.’ But we rarely use them. Many reliability engineers don’t know what they are. But they are also in lots of textbooks as if they are really important. So what are they? The good news is that they are pretty simple to understand. The bad news is that they can be difficult to find. Mercifully, they are mainly used by computers who do the hard work of calculating system reliability for us. So knowing what ‘cut sets’ are can be really informative … even if you don’t use them every day.
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Confidence is a Measure of You (not our product)

podcast episode with speaker Chris Jackson

We like to think that we make decisions based on the information we have available to us. We don’t. We instead make decisions based on emotions. And the most dominant emotion we rely upon when making a decision is confidence. You can have all the information in the world, but if you don’t understand it, don’t trust it, or otherwise don’t believe in it, then you won’t have the confidence to make the right decision. And we often try and generate ‘false’ confidence by having lots of clauses in contracts, schedule lots of tests, and demand people comply with standards. But the confidence these things create is a façade that quickly gets broken down when our products don’t meet our expectations. Want to understand the only way you should be generating confidence when it comes to reliability engineering? Join us for this webinar! [Read more…]

Fundamentals of Allocation

podcast episode with speaker Fred Schenkelberg

The dividing up of a reliability goal is one way to specify reliability goals for specific key elements of your product. Yet, that is not the only purpose of allocation. It can and should be a key practice to get your team working toward a common goal in a unified and collaborative manner.

Let’s discuss a couple of easy ways to accomplish reliability allocation or apportionment, then examine a valuable way to use this tool to improve the chances of achieving your overall reliability goal.

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