MTTR, MTBF, or MTTF? – A Simple Guide To Failure Metrics - The Ins and Outs of Maintenance
MTBF, MTTR, MTTF and FIT are reliability terms based on methods and Repair ), MTTF (Mean Time To Failure) and FIT (Failure In Time) are ways of providing. What exactly differentiates “mean time to failure” from “mean time between failures”? And how does “mean time to repair” play into it? Let's get. Reliability HotWire: eMagazine for the Reliability Professional · Reliability . Note : I'll use MTTF rather than Mean Time Before Failure for the remainder of this article. When I This is one of the most common ways to view failure distributions.
Only by tracking these critical KPIs can an enterprise maximize uptime and keep disruptions to a minimum. Tracking the reliability of assets is one challenge that engineering and maintenance managers face on a daily basis.
While failure metrics can be very useful in this context, to use them effectively, you need to know what meaning hides behind their acronyms, how to distinguish between them, how to calculate them, and what does that tell you about your assets. Introduction to Failure Metrics Even the most efficient maintenance teams experience equipment failures.
But first, what does equipment failure look like? Failure exists in varying degrees e. Managing failure correctly can help you to significantly reduce its negative impact.
MTBF & MTTR | What are they and what are their differences?
To help you effectively manage failures, there are a number of critical metrics that should be monitored. Understanding these metrics will eliminate guesswork and empower maintenance managers with the hard data they need to make informed decisions.
Which failure metrics should be tracked? High-level failure statistics require a significant amount of meaningful data. Collecting inaccurate data can cause a lot of issues. Maintenance technicians might occasionally write down the wrong figure is just one example.
The Bathtub Curve and Product Failure Behavior (Part 2 of 2)
A potentially much bigger problem is neglecting to record tasks, which leads to incomplete data. If data is missing or inaccurate, your failure metrics will be useless in informing decisions on improving operations. Worse still, if you are unaware that the data is unreliable, you might end up making operational decisions that could actually be counterproductive and harmful.
- Mean time between failures
- MTTR, MTBF, or MTTF? – A Simple Guide To Failure Metrics
- MTTR and MTBF, what are they and what are their differences?
The MTTR clock starts ticking when the repairs start and it goes on until operations are restored. This includes repair time, testing period, and return to the normal operating condition. How do you calculate MTTR?
Calculating Failure In Time (FIT) Rate for KEMET Capacitors
To calculate MTTR, divide the total maintenance time by the total number of maintenance actions over a given period of time. Imagine a pump that fails three times over the span of a workday.What is MTBF (Mean Time between Failure), MTTF (Mean time to Failure), MTTR (Mean time to Repair) ?
The time spent repairing each of those breakdowns totals one hour. A couple of things to note: Typically, every instance of failure will vary in severity. So while some incidents will require days to repair, others could take mere minutes to fix. Hence, MTTR gives an average of what to expect. Every efficient maintenance system always needs to look at how to reduce MTTR as much as possible. That can be done in a few different ways. One approach is through tracking spare parts and inventory levels thereby saving on downtime while sourcing for parts.
Another way is to implement proactive maintenance strategies like predictive maintenance. These sensors can alert them well in advance when to expect failure.
Defining Failure: What Is MTTR, MTTF, and MTBF?
At this point, the repair is no longer reactive but predictive, as the manager has enough time to arrange for all the resources needed to execute the job. Why is MTTR helpful?
Taking too long to repair a system or equipment is not desirable as it can have a highly unpleasant impact on business results. This is especially the case for processes that are particularly sensitive to failure. It often results in production downtime, missed deadlines, loss of revenue and so on.
Understanding MTTR is an important tool for any organization because it tells you how efficiently you can respond to and repair any issues with your assets. Most organizations seek to decrease MTTR with an in-house maintenance team supported with the necessary resources, tools, spare parts, and CMMS software.
Maintenance managers can use MTTR to inform maintenance decisions such as: So, in addition to repair time, testing period, and return to normal operating condition, it captures failure notification time and diagnosis.
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.
In the case of MTTR, the effort should be exactly the opposite: A lower mean-time-to-repair indicates that your company has quick answers to problems in their processes, which demonstrates a high degree of efficiency. Have you got any questions on these two indicators?
To learn more about the availability calculation please read our article about the costs of a downtime. From the availability of the environment managed it is possible to measure the average time between failures and the average time for repair.
As developers of OpMona solution for monitoring IT infrastructure and business processes, we always indicate it if customers want to measure this type of indicator besides, of course, all its technology park. If you are interested, click the button below: