The term maintenance is defined differently in various industries. 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. In preventive maintenance, we mostly practice the concept before a failure has happened. 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. Here are the types 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. The main types of corrective maintenance include deferred maintenance and emergency maintenance.
In this section, we will take you through detailed descriptions of the types of maintenance that fall within preventive maintenance. The main role of time-based maintenance is to change or renew a product in order to restore its reliability at a fixed interval, time and usage without minding its condition. In most cases, time-based maintenance is used to shield against the failure of wearing parts which are known to have predictable mean time between failure. Furthermore, when we use time-based maintenance, we assume that failure is age-related and a clear service can be determined.
When you use failure finding maintenance, you need to base your search on finding the hidden failures linked to protective functions. If you want to use failure finding maintenance, you must ensure that the item you want to investigate has failed. This implies that under normal conditions, it will be difficult to know whether an item is still functional.
Risk based maintenance is different from time-based and failure finding maintenance since risk-based requires one to use risk assessment concept to assign the scarce resource to the ones that take much risks in the event of a failure.
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.