Failure Finding Maintenance is conducted at fixed time intervals typically derived from legislation And once detected you’ll have to repair the failure you found. It’s important to realise that failure-finding maintenance tasks do not prevent failure but simply detect it. And since these failures are hidden, you’ll need to find them before you are relying on that equipment to protect you. That means that under normal operating conditions you will not know whether this equipment is still functional i.e. This type of equipment won’t be required to function until something else has failed. Think pressure safety valves, trips transmitters, and the like. Failure Finding Maintenance (FFM)įailure Finding Maintenance tasks are aimed at detecting hidden failures typically associated with protective functions. Examples of Risk-Based Maintenance would be Risk-Based Inspection asĪpplied to static equipment like vessels and piping or even pressure relief valves. Risk-Based Maintenance is essentially preventive maintenance where the frequency and scope of the maintenance activities are continuously optimised based on the findings from testing or inspection and a thorough risk assessment. When you implement a Risk-Based Maintenance process effectively you should have reduced the total risk of failure across your plant in the most economical way. Low-risk equipment may be maintained at a much lower frequency and possibly with a much smaller scope of work. Risk-Based Maintenance (RBM) is when you use a risk assessment methodology to assign your scarce maintenance resources to those assets that carry the most risk in case of a failure (remembering that risk = likelihood x consequence).Īs a result, equipment that has a higher risk and a very high consequence of failure would be subject to more frequent maintenance and inspection. In the following paragraphs, I will explore each of these maintenance types in more detail including when you should consider using them. every 150 cycles, every 10,000hrs, or like your car: service every 10,000km.Īpart from the regular interval approach (time-based maintenance) there are also other maintenance types that fall within the category of preventive maintenance: But preventive maintenance can also be based on usage e.g. every week, every month, or every three months. Preventive maintenance can be time-based i.e. Time-Based Maintenance is basically a type of maintenance that is done at a regular interval while the equipment is still functioning with the objective of preventing failure or reducing the likelihood of failure. When people talk about preventive maintenance (or preventative maintenance) they usually refer to what is better described as Time Based Maintenance (TBM). Scheduled restoration tasks and replacement tasks are examples of preventive maintenance tasks.” (source: Reliabilityweb) Time-Based Maintenance (TBM) Preventive maintenance, sometimes referred to as routine maintenance, can be defined as “an equipment maintenance strategy based on replacing, or restoring, an asset at a fixed interval regardless of its condition. In the rest of this article, I will discuss each of these different maintenance types in detail: Time-Based Maintenance, Failure Finding Maintenance, Risk-Based Maintenance, Condition BasedĬorrective maintenance is done after a failure has occurred either as Deferred Corrective Maintenance or as Emergency Maintenance. Preventive Maintenance is done before a failure occurs and consists of maintenance types like: There are 9 maintenance types split between Preventive Maintenance and Corrective Maintenance. However, as I’m often asked questions about the different a specific type of maintenance I decided to put a quick overview together. Like, when to use condition-based maintenance. As long as we sensibly talk about the underlying principles. If what I consider to be condition-based maintenance you call predictive maintenance that doesn’t really matter. Other than making sure we are talking about the same thing. What are the different maintenance types?Īs far as I am concerned terminology is not important.
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