Before we take you through the definition and types of maintenance, it is worth noting that the concept has different meanings across disciplines. Here, we will not talk about maintenance as used in specific disciplines, however, we will offer the general meaning of the term and also discuss the different types of maintenance.
The major divisions of maintenance are corrective maintenance and preventive maintenance. It is worth noting that if you want to apply the concept of preventive maintenance on an event, you must ensure that you do so before a failure has occurred. Besides, the task may be aimed at preventing a failure, lowering the consequence of the failure as well as assessing the risk of the failure occurring. The following are examples of preventive maintenance they include time-based, failure finding, condition based, predictive and risk-based maintenance.
Unlike preventative maintenance that is applied before a failure occurs, corrective maintenance is effective after a failure has happened. Unlike preventive maintenance which is classified into many divisions, corrective maintenance has only two divisions which are deferred maintenance and emergency maintenance.
Here are the descriptions of the types of preventive maintenance. Time based maintenance refers to the process of replacing an item for purposes of restoring its reliability at a fixed time, interval or usage irrespective of its condition. The purpose of time-based maintenance is to protect users against failure of known wearing parts that have predictable mean time difference between failure. Furthermore, when we use time-based maintenance, we assume that failure is age-related and a clear service can be determined.
Unlike time-based maintenance, failure finding maintenance aims at noticing the hidden failure of an item which is associated with protective roles. It is worth noting that this type of maintenance is not necessary until something has failed. The fact that failure based maintenance is only used after a failure has happened, it seems nearly impossible to know whether equipment is functional under normal operating conditions.
When you want to apply risk-based maintenance on an item, you will have to use risk assessment methodology to assign the limited resources to those that carry the most risks when a failure happens.
Suppose you find that something is in the early stages of failure, you may take action to avoid the consequences of failure. If you are looking for a strategy that can stop failure from happening, you may consider using condition based maintenance as it focuses on the physical evidence that an event is about to fail.
Predictive based maintenance is viewed as advancement to condition-based maintenance where a number of potential parameters sourced from online sensors to determine if an item is deviating away from normal operating conditions and heading towards failure. Therefore, when you understand the types of maintenance, you will be able to know the types to adopt in your operations depending on the situation at hand.