What’s MTBF & MTTR?| Formula| Example| Calculation

What’s MTBF & MTTR?| Formula| Example| Calculation

It indicates the expected time between two failures for a fixable machine or system.

→ MTBF =( (Total working time)- ( Total Breakdown time))/ (No of Breakdowns) or = ( Total uptime)/ ( number of breakdowns)

 → It's really important for Total Productive Maintenance (TPM) implementation which is one of the most popular Lean Manufacturing Tool.

MTBF Calculation 

→ Three similar machines functioning properly at 0 hours are working until all of them fail. → The first machine failed at 120 hours, the second failed at 140 hours and the third failed at 150 hours.

→ The MTBF = ( Total uptime)/ ( number of breakdowns) = ( (120140150))/ 3 = 136.667 hours.

→ The MTBF is the normal of the three failures, which is136.667 hrs.

→ It can be calculated as the arithmetic mean between the failures of equipment.

→ In other words, It's the average duration between the failure of equipment.

→ This value136.667 means that a failure in the system occurs every136.667 hours and it generates losses to the company.

→ The chance is to increase the duration between two breakdowns. → In other words, the MTBF is the timing from one failure to another for fixable equipment.

How can I improve my MTBF?

→ We can improve it by regular maintenance of machines.

→ By implementing small Kaizen activity for the equipment. → Make an equipment breakdown history book and take a strong preventing action on it so this breakdown won't repeat in the future.

Benefits of MTBF

→ It's a fundamental indicator to predict the trustability of a machine.

→ Ifthe_MTBF has increased after a preventive maintenance activity also this indicates a clear improvement in the quality of your processes 

→ It's really useful for implementing Lean Manufacturing culture in the plant. →The MTBF increase will show that your maintenance or verification methodologies are going good.

→ It should be used to elaborate on the company’s knowledge about processes.

→ It reduces losses in productivity and also improves the quality of the product


What's MTTR (Mean Time To Repair)?

→ It's the average time needed to analyze and solve the problem and it tells us how wellan association can respond to machine failure and repair it.

→ In other words, failed equipment returns to normal operating conditions or the mean timing duration between the equipment failure and returns to operation.

→ It's a fundamental specialized indicator related to the maintainability of the machine andrepairable parts.

→ It represents the average duration needed to repair a failed element.

→ In other words, how long the machine is out of production.

→ This includes notification timing, analysis timing, fixing timing, staying, reassembly timing, alignment timing, calibration timing, testing timing, etc.

→ The formula of MTTR = Total maintenance time/ number of repairs → It's also called as the meantime to recovery.

MTTR Calculation 

→ A machine should operate rightly for 20 hours. During this period, 6 failures occurred. The sum of all failure duration is 90 minutes.

→ The MTTR = Total maintenance time/ number of repairs = 90/ 6 = 15 minutes

Why MTTR is important?

→ It has a remarkable effect on the association’s profit.

→ Long MTTR means loss of productivity and now and then, an association can miss an orderor it can impact business relationships.

→ To reduce the impact of MTTR, associations should have their own maintenance teams and hold critical spare parts onsite or run parallel production lines.


How can I improve my MTTR?

→ We can improve it by Team Work.

→ Implement and follow the troubleshooting manual concept or breakdown history concept 

→ By give training on quick form and motivate people

→ Maintaining 5S

→ Follow the standardized operation procedure.

→ Keep the critical extra in stock

Benefits of MTTR

→ It indicates the efficiency and productivity of the equipment and it has reduced after the precautionary maintenance of the machine.

→ By reducing Mean Time To Repair we can improve the efficiency and productivity of the machine.

→Lower_MTTR indicates that your company has an immediate action plan to overcome failure.

→ It should be used to elaborate on the company’s knowledge about how strong the action plan against the machine failure.

→ It reduces losses and also improves productivity and Quality of the Product.

→ It's really useful for implementing Lean Manufacturing culture in the plant.

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