Availability is not equal to Reliability
Refers to the difference between equipment design speed and the actual operating speed. Some parts may not be able to run at a machines maximum rate (for. The most common measures that can be used in this way are MTBF and MTTR. MTBF is Mean Time Between Failures MTTR is Mean Time To. Most IT professionals are used to talking about uptime, downtime, and system failure. But not everyone is entirely clear on the definition of the.
Mean time between failures - Wikipedia
Adding to all failures, we have 60 minutes 1 hour. Calculating the MTBF, we would have: The opportunity to spot this index allows you to plan strategies to reduce this time.
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Therefore, the company knows that every 2 hours, the system will be unavailable for 15 minutes. Being aware of our limitations is the first step to eliminate them.
MTTR and MTBF, what are they and what are their differences?
We can get to the uptime of a system, for instance, using these 2 KPIs. Imagine the following situation: How long the system should work: How long the system was not working: How long the system has been available: A total of 4 failures occurred.
If the MTBF has increased after a preventive maintenance process, this indicates a clear improvement in the quality of your processes and, probably, in your final product, which will bring greater credibility to your brand and trust in your products. The MTBF increase will show that your maintenance or verification methods are being well run, a true guide to support teams.
Mean time between failures
In the case of MTTR, the effort should be exactly the opposite: Then the challenge becomes how to reduce the planned outages and get better life out of the components or items involved so these planned intervals can be expanded. As above, it is important to clarify what exactly constitutes a failure and downtime vs uptime.
Allowing this to continue can show a better MTBF than the story in its entirety should show.
Better preparation, spare parts programs, predictive analysis, are methods to reduce the MTTR. Not all repairs are equal.
What constitutes an acceptable repair? This should be defined in the definition of a failure as well. The machine should not only be "up", but it should be up to a certain level of sustained performance before the time can be counted as "uptime".
Total Production Time PT: Examine, every interval between failure. Each amount of time between each repair is one data point.
MTBF & MTTR | What are they and what are their differences?
And analyze is amount of time it took for a repair. Each time to repair is one data point. If the data is normal, the apply the mean. If the data is not normal, then the median or mode may be more appropriate. This analysis may also indicate outliers such as a period time that was unusually long or short between failures. Perhaps the team can brainstorm the reasons why using the 5-WHY tool? Was the repair done differently? Was the repair done be a different person or group of people?
Was a different part s used? This can shed light on best practices or components that should be used again for a closer Design of Experiments DOE to find the optimal combination or best procedure.Understand ‘MTTR’, ‘MTBF’ & ‘MTTF’ –Video from ‘Quality HUB India’
It may be worth spending a little more money up front to use quality parts or perform a longer PM to save more time in the long run. The team will have to determine if this is acceptable.
The intention is to strengthen the requirement for equipment maintenance and overall proactive management. The results of these metrics are inputs to the Management Review section, 9. The downloads are in a. A extractor such as WinZip is required to unzip the package.