Presentations and Videos
This past couple of weeks have been great.
First, I heard about a webinar by Craig Hillman of DFR Solutions titled “MTBF. Is There a Better Way?” and you can find the recorded event on the DFR Solutions site.
Is MTBF a beginners metric?
MTBF as stepping stone to better reliability metrics
MTBF is taught in many textbooks and introductory reliability courses. There may be some mention of Weibull and other distributions. You may even learn about the four functions: – reliability – probability density function (PDF) – cumulative density function (CDF) – hazard function
Let the data talk
Plot the data
A table of numbers is not information, it is data. It is information that we need to make decisions, to notice differences and to detect patterns. It is a plot of the data that is often all that we need to interpret the data.
1st Annual No MTBF Success Story Challenge
No MTBF Success Story Challenge
Last year I offered a coveted NoMTBF coffee mug to the most traffic generating guest post.
This year, my challenge is for the best success story around your efforts to reduce or eliminate MTBF from use in your organization.
The basic idea is we all have a role to play to clean up the reliability profession. Using clear language is a start. Avoiding the mis-understanding around MTBF is a great start. If we all do something, great or small, toward the goal of eradicating MTBF we all benefit. [Read more…]
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Cheers,
Fred
How to calculate MTTF
A Question and my Response on MTTF
So this corrosion engineers walks into NoMTBF and send me a message.
The Questions
Hi, I am corrosion engineer. May be you know for risk assessment of heat ex-changer tube bundle in API-581 , mean time to failure (MTTF) term is defined and used for risk assessment.
Would you please give me more information about MTTF and what history data required to calculate MTTF?
Thank u so much
My Response
Normal Distribution PDF
This is a work in progress and – needs work.
[WolframCDF source=”http://nomtbf.com/wp-content/uploads/2014/02/Normal-PDF.cdf” width=”625″ height=”1500″ altimage=”http://nomtbf.com/wp-content/uploads/2014/02/Normal-PDF.pdf” altimagewidth=”625″ altimageheight=”1500″]
Time to review our goal
Setting aside some time to review our goal
As annual milestones occur, like the approach of the new year or the end of a project, we often take time to reflect. Did we accomplish what we had set out to accomplish? Are we making progress? Are we making a difference?
Part of this process is having a goal to start.
Calculating reliability from data
In the last note, we calculated MTBF using some test data. Now let’s start with the same situation and calculate reliability instead. As before: There are occasions when we have either field or test data that includes the duration of operation and whether or not the unit failed.
MTBF and Maintenance
A guest article by Andrew Roland. In an earlier article, we looked at how MTBF alone can be misleading when selecting an item for use in a design. In this article, we’ll take a look at how the MTBF metric falls short as an input to maintenance planning.
Clarity
Moving toward clarity reliably
I recently saw a quote with the notion to stop complaining and do something positive. Which happens to work with my mother’s admonishment
If you have nothing good to say, say nothing.
So, while I’ve been railing against MTBF and then suggesting a better metric, my message on use something else has gotten lost. Recently on a Linkedin group discussion someone suggests yesbx.com as a sister site to nomtbf.com.
Maybe it is time to focus on a positive message around a replacement metric to MTBF. You already know my position on MTBF. So what do I recommend. [Read more…]
NoMTBF: a Prezi
Playing with Prezi and thought it would be fun to create one for the NoMTBF campaign.
Take a look, let me know what you think? And, feel free to use it as needed.
End MTBF Debating
The End of MTBF Debating
Endless debate on merits of MTBF is meaningless as more than one has told me. My neighbor has a bumper sticker that says Endless War with the ‘less’ crossed out and written above it ‘this’. Instead of endless debate, how about we just end this now. Stop using MTBF and all related grand averages. Use the statistics, distributions and knowledge you have to provide accurate estimates and summaries.
Replacing MTBF with Bx
A Guest Post by Jim McLeish titled:
Replacing MTBF/MTTF with Bx/Lx Reliability Metrics
Jim McLeish – Mid-West Regional Manager – DfR Solutions
(Rochester Hills Michigan)
http://www.linkedin.com/in/jimmcleish
Expanded from the RIAC Reliability Information Analysis Center Linkedin Group Discussion on
“Great challenge for change from Fred – No MTBF!”
“Endless discussion and it seems there’s no real solution to get rid of MTBF”
See original and ongoing Linkedin discussion here.
I am absolutely astonished that the reliability profession and its noted experts are unable to develop a better metric to characterize reliability performance and specify reliability requirements. I respectfully submit that there is a simple and eloquent solution that has successfully been used in the ball bearing and machine industry for decades (that actually predates MTBF/MTTF), that should be considered as a replacement to MTBF/MTTF. [Read more…]
Someone had to do it
Take on MTBF, that is.
In a conversion with a colleague I mentioned the amount of traffic the NoMTBF site has been enjoying. For what started simply as a device for a discussion, the No MTBF movement has turned into quite an endeavor. We talked about the idea that unless someone starts and stays with the effort, MTBF will continue to erode the credibility of reliability engineering. We talked about the idea that unless we started the discussion to only use MTBF when it is proper to do so, that we would be plagued by the rampant misunderstanding and misuse for decades to come.
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