The MTTR « Mean Time To Repair » or Average Total Time of Repair or even average time to repair is a second indictor to measure the efficiency of the maintenance.
MTTR or Mean Time to Repair Methodology: The steps for MTTR start as the repairs begin and continues until the operations are up and running. Thus, it takes into consideration of time to:
- Inform the technician
- Identify the problem
- Repairing
- Testing time period
- Reassemble, alignment and calibration
- Test and start up the asset for production.
Calculating MTTR:
MTTR is calculated by dividing the total downtime caused by breakdowns (failures) by the total number of breakdowns (failures). In other words, it can be summed up as the time spent on the repairs divided by the total number of repairs performed. It helps an organization to check how well they can respond to unplanned breakdowns (Failures) and repair them.
MTTR = Total downtime due to breakdowns (failures) / Total number of breakdowns (failures)
This calculation takes into account that:
- Tasks are performed in a sequence
- Tasks are performed by trained employees
It is important to note Lesser the MTTR value better the equipment availability.
Relations with Availability of equipment?
Availability is one of the important factors contributing to the overall equipment effectiveness OEE of a plant. It can be described as Availability of an equipment for operation from total available time. It requires to calculate both (MTBF) Mean time between failures and (MTTR) Mean time to repair for calculating OEE.
(MTBF - see this term in the glossary)
Why MTTR?
When an equipment is under breakdown, it’s non-operational. Frequent breakdowns and prolonged downtime lead to lower equipment availability and equipment uptime. This results in bad business results. An organization leads to missed production deadlines, increased labor costs, loss of revenue, and a variety of operational issues because of frequent and prolonged breakdowns. Most organizations seek to decrease MTTR with an in-house maintenance team.
Understanding MTTR is an important tool for any organization because it needs efficiently tackling or respond to any failures and repair or any issues with your assets/equipment.
TLDR
- MTTR (Mean Time To Repair) measures maintenance efficiency.
- MTTR is calculated by dividing total downtime by total breakdowns.
- Lower MTTR values indicate better equipment availability.
- MTTR is related to equipment availability and OEE (Overall Equipment Effectiveness).
- Decreasing MTTR can lead to better business results and reduced downtime.
- Understanding MTTR is crucial for organizations to efficiently respond to failures and repair assets.
FAQ
What is MTTR?
MTTR (Mean Time To Repair) is a measure of maintenance efficiency that indicates the average time it takes to repair equipment or assets.
How is MTTR calculated?
MTTR is calculated by dividing the total downtime caused by breakdowns by the total number of breakdowns.
Why is MTTR important?
Understanding MTTR is crucial for organizations to efficiently respond to failures and repair assets, leading to better business results and reduced downtime.
What is the relationship between MTTR and equipment availability?
Lower MTTR values indicate better equipment availability, as it shows that equipment can be repaired quickly and efficiently.
How is MTTR related to OEE?
MTTR is related to OEE (Overall Equipment Effectiveness), as it requires calculating both MTBF (Mean Time Between Failures) and MTTR to determine equipment effectiveness.
Why do organizations seek to decrease MTTR?
Organizations seek to decrease MTTR to reduce downtime, labor costs, and lost revenue, ultimately leading to better business results.
What is the impact of frequent and prolonged breakdowns on business?
Frequent and prolonged breakdowns can lead to missed production deadlines, increased labor costs, loss of revenue, and various operational issues.
