Accendo Reliability

Your Reliability Engineering Professional Development Site

Home » Articles » Page 48

Articles

Find all articles across all article series listed in reverse chronological order.

by Leave a Comment

Safety is Integral to Engineering Education

Safety is Integral to Engineering Education

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

All this knowledge, passed on for our Engineers, is of little use unless it reaches the right people. The individuals and institutions which educate the safety engineers and who will be responsible for the design and operation of plants handling hazardous materials have a duty to make their students aware of the hazards and at least to make a start in gaining competence in handling them.

As elsewhere in engineering, computers are in wide-spread use in the design of process plants, where computer aided design (CAD) covers physical properties, flow sheeting, piping and instrument diagrams, unit operations and plant layout. There is increasing use of computers for failure data retrieval and analysis, reliability and availability studies, fault tree analysis and consequence modelling, while more elusive safety expertise is being captured by computer-based expert systems.

[Read more…]

by Leave a Comment

MTBF Confidence Intervals using tables and Excel Template

MTBF Confidence Intervals using tables and Excel Template

In this video, Hemant Urdhwareshe explains concept of Confidence Intervals for Mean Time Between Failures (MTBF). The concept is explained for time terminated and failure terminated tests. The calculation is illustrated with Chi-square distribution tables and also Excel Template created by IoQR. The video would be useful to those who want to learn these concepts and learn how to calculate MTBF confidence intervals using tables. It will be beneficial to those who wish to take ASQ CRE, CQE, Six Sigma Black Belt and CMBB certification exams.

[Read more…]

by Leave a Comment

The Synergy of Structured Problem Solving and Statistical Tools

The Synergy of Structured Problem Solving and Statistical Tools

Co-authored by Mike Vella and Ray Harkins

How many times have we heard that we must tolerate poor process performance because it’s “the nature of the beast” or its excess variability is considered “normal”? How much does financial performance suffer due to allowances for alarming levels of scrap, low yields, or losses considered “best practice” for the industry? Improving these situations requires a great team, supportive management, and cooperative suppliers. Beyond the support, operations and quality leaders must know a systematic method of problem-solving and have access to statistical tools to drive the data through to a solution.

[Read more…]

by Leave a Comment

Concurrent Failure Analysis and Prevention

Concurrent Failure Analysis and Prevention

Concurrent or simultaneous failures can happen with redundant or spared systems. This means that both spared equipment can fail at the same time leaving the operator with no production output. For example, we have two alternating pumps operating in a parallel configuration. Each one acts as a spare and at any one time can take over if the other one fails. This article is based on a question I was asked during a recent industry presentation. I thought the example was interesting and informative enough to share with the Maintenance and Reliability community.

[Read more…]

by Leave a Comment

The Many Ways of Data Analysis

The Many Ways of Data Analysis

Given Some Data, Do Data Analysis

Let’s say we have a set of numbers, {2.3, 4.2, 7.1, 7.6, 8.2, 8.4, 8.7, 8.9, 9.0, 9.1} and that is all we have at the moment.

How many ways could you analyze this set of numbers? We could plot it a few different ways, from a dot plot, stem-and-leaf plot, histogram, probability density plot, and probably a few other ways as well. We could calculate a few statistics about the dataset, such as mean, median, standard deviation, skewness, kurtosis, and so on. [Read more…]

by Leave a Comment

The Future of Production is Endless Risk Free Operation

The Future of Production is Endless Risk Free Operation

 The world needs plant and equipment that are reliable and fault-free for decades. Yet Maintenance can only keep machinery working by replacing broken and at risk parts. Even industrial asset management only aims to lower the cost of plant and equipment ownership. Neither methodology has the capability to deliver what mankind needs in future. Before the end of this century both disciplines will die-out because intelligent production machines will be made that are completely reliable and maintenance-free for their entire lifetimes.

[Read more…]

by Leave a Comment

Great Leaders Focus on the Why, Not the How of Risk Management

Great Leaders Focus on the Why, Not the How of Risk Management

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

Effective leaders provide their employees with a heartfelt portrayal of the WHY, a deep-rooted purpose, before defining the WHAT, the product or service, and then finally, the freedom on the HOW, which is the process.

First, understand the WHY of your solution. This gives you the line of thinking needed to decide HOW you can provide this solution in a way that is better than your competitors and more efficient for your customer.

[Read more…]

by Leave a Comment

Weibull Distribution Part2: Three-Parameter Weibull, B10 life, Characteristic Life

Weibull Distribution Part2: Three-Parameter Weibull, B10 life, Characteristic Life

This is the second part of our two videos on Weibull Distribution. In this video, Hemant Urdhwareshe discusses few more concepts of Weibull Distribution, such as characteristic life, three-parameter Weibull and B10 life for Weibull Distribution. The concepts are explained with an application case study to calculate reliability using the Weibull Reliability function. The video would be useful to all those who want to learn applicability of Weibull Distribution to estimate reliability and to those who wish to take ASQ CRE, CQE, Six Sigma Black Belt and CMBB certification exams. In Weibull Distribution Part-1, Hemant had explained various basic concepts in Weibull Distribution with brief discussion on mathematical relationships.

[Read more…]

by Leave a Comment

FINESSE Fishbone: The I Stands for Illustrate

FINESSE Fishbone: The I Stands for Illustrate

Technically trained professionals often get wrapped up in things like visualization, which distracts us from our mission. Our mission is to provide information to decision makers, and technical professionals are trusted advisors. So, most of our graphics, visuals, and videos should be informational. The I in FINESSE stands for Illustrate. Illustrate includes all the visuals, graphics, videos, and other media used in technical reports and presentations. These three tips and a short video provide focused examples.

[Read more…]

by Leave a Comment

High MTBF with Low Reliability

High MTBF with Low Reliability

Can You Have a High MTBF and Low Reliability?

As regular readers know, MTBF by itself is misleading. It can also be deceptive when representing actual data. Just because you have a high MTBF value doesn’t mean it is reliable.

In a previous article, 10 Reasons to Avoid MTBF, I mentioned that it is possible to have a relatively high MTBF value when the actual reliability is low. Ashley sent me the following note:

Hi Fred, i love reading your articles they are very informative. I have a question about something you said in a comment which i am hoping you will be able to clarify for me. You said products with higher MTBF can actually be less reliable than products with a lower MTBF

I have tried to find information on how this is possible online, and tried to do the maths myself to make this happen but i have to admit i am struggling.

No worries, Ashley, let’s work out an example to illustrate what I meant. [Read more…]