Many definitions are used when it comes to the different types of maintenance. It can quickly get confusing when people talk about different types of maintenance. It is an indisputable and important fact that the performance, operation and life of your equipment relies on the right maintenance at the right time. The right approach also decreases costs and increases efficiency.
The maintenance types can be summerized in nine steps and listed under two categories which are Preventive Maintenance and Corrective Maintenance.
Preventive Maintenance is done before a failure occurs, whereas Corrective maintenance is done after a failure has occurred.
Preventive Maintenance
Time Based Maintenance
Failure Finding Maintenance
Risk Based Maintenance
Condition Based Maintenance
Predictive Maintenance
Corrective Maintenance
Deferred Corrective Maintenance
Emergency Maintenance
Time Based Maintenance: Time-Based Maintenance refers to replacing or renewing an item to restore its reliability at a fixed time, interval or usage regardless of its condition. The purpose of Time Based Maintenance is to protect against the failure of known wearing parts which have predictable Mean Time Between Failure (MTBF).
Failure Finding Maintenance:Failure Finding Maintenance tasks are aimed at detecting hidden failures typically associated with protective functions. Think pressure safety valves, trip transmitters and the like. It’s important to realise that failure finding maintenance tasks do not prevent failure but simply detect it.
Risk Based Maintenance: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. As a result, equipment that has a higher risk and a very high conseauence of failure would be subject to more frequent maintenance and inspection. Low risk equipment may be maintained at a much lower frequency and possibly with a much smaller scope of work. 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.
Condition Based Maintenance: If evidence can be found that something is in the early stages of failure, it may be possible to take action to prevent it from failing completely and/or to avoid the consequences of failure. Condition Based Maintenance as a strategy therefore looks for physical evidence that a failure is occurring or is about to occur. An important concept within Condition Based Maintenance is the P-F curve. The curve shows that as a failure starts manifesting, the equipment deteriorates to the point at which it can possibly be detected (point “P”). If the failure is not detected and mitigated, it continues until a functional failure occurs (point “F”). The time range between P and F, commonly called the P-F interval, is the window of opportunity during which an inspection can possibly detect the imminent failure and give you time to address it.
Predictive Maintenance: Predictive Maintenance is an extension, a more advanced approach to CBM where we use potentially many process parameters gained from online sensors to determine if our equipment is moving away from stable operating conditions and is heading towards failure.
Corrective Maintenance: Corrective Maintenance is also the result of unplanned failures which were not avoided through preventive maintenance. corrective maintenance as a strategy it is essential to ensure that the failure modes under consideration do not have the potential to become Emergency Maintenance.
Emergency Maintenance: Emergency Maintenance is corrective maintenance extremely urgent. Emergency Maintenance is the one and only maintenance type that we really want to avoid as much as possible.
Metrans offers the whole maintenance range regardless of pump manufaturer or model with 30 years of experience in its sector.