Step 1:Note down the value of TOT which denotes Total Operational Time. A high Mean Time to Repair may mean that there are problems within the repair processes or with the system itself. MTTR Formula: Total maintenance time or total B/D time divided by the total number of failures. If you are consistently seeing a longer MTTR on certain assets, parts of the plant, or a certain facility, it’s worth investigating if parts are the reason. So together, the two values give us a sense of how much downtime an asset is having – or expected to have – in a given period (MTTR), and how much of that time it is operational (MTBF). Servitization for Manufacturers: Is It The Future of Business? Expressed mathematically, it is the total corrective maintenance time for failures divided by the total number of corrective maintenance actions for failures during a given period of time. Let’s say you have a very expensive piece of medical equipment that is responsible for taking important pictures of healthcare patients. So here we are going to calculate the MTTR, details of calculation are given below. If there is a large downtime to repair after the item breaks, then you need to take this into account, as the is the mean time between failures. Mean Time to Repair (MTTR) The mean time to repair is given by . MTTR is not intended to be used for preventive maintenance tasks or planned shutdowns. It is also a valuable piece of information when making data-driven decisions, and optimizing the use of resources. The most common time increment for mean time to repair is hours. MTTR formula is calculated by dividing total maintenance time by the total number of maintenance actions over a specific period. MTTR mathematical formula is Total repair or replacement time (hours) divided by Number of repair/replacement events. MTR can be written in the form of the formula: MTR = Total downtime / # occurrences of stoppages Suppose that a mechanical mixer, usually operating 10 hours per day, broke down twice in a month. Better preparation, spare parts programs, predictive analysis, are methods to reduce the MTTR. In this article, we perform a simple example using BlockSim 8 to show how a maintenance action that brings a … The average duration of a machine breakdown, MTTR (Mean Time To Repair), is calculated from the individual history of a piece of equipment. For example, if you have spent 50 hours on unplanned maintenance for an asset that has broken down eight times over the course of a year, the mean time to repair would be 6.25 hours. MTTR can be used to measure stability of operations, availability of resources, and to demonstrate the value of a department or repair team or service. Usually people think of it as the average time that something works until it fails and needs to be repaired (again). Ultimately, MTTR helps your organization wipe out any inefficiencies that are causing lost production and the lost money that comes with that. The maximum time to repair is given by. It represents the average time required to repair a failed component or device. For the above example, it will be: There are actually four different definitions of MTTR in use, which can make it hard to be sure which one is being measured and reported on. Because long repair times for mission-critical equipment mean product scrap, missed orders, and soured business relationships, MTTR helps organizations identify why maintenance may be taking longer than is ideal and make more informed decisions to fix the underlying causes. Providing a full history of an asset to your technicians can also provide valuable clues that may help them narrow down the source of a problem. For example, if MTTR is increasing, it might be because PMs aren’t standardized, leading to more equipment failure. 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