Types of maintenance
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Types of maitenance
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Planned Maintenance
“The maintenance organized and carried out with forethought, control and the use of records to a predetermined plan.”
Preventive Maintenance
“The maintenance carried at predetermined intervals or corresponding to prescribed criteria and intended to reduce the probability of failure or the performance degradation of an item.”
Breakdown Maintenance
Repair is undertaken only after failure of system. Equipment is allowed to run till it fails. Lubricating and minor adjustments are done during the period.
-Small factories where equipment are very small and doesn’t use special tools
– Isn’t suitable for big industries
Opportunistic Maintenance
In multi component system, several failing components, often it is advantageous to follow opportunistic maintenance. When an equipment or system is taken down for maintenance of one or few worn out component, the opportunistic maintenance can utilize for maintaining or changing other wear out components, even though they are not failed.
-It is actually not a specific maintenance system, but its a system of utilizing an opportunity which may come up any time.
Corrective Maintenance
Maintaining action for correcting or restoring failed unit.
– Very vast scope for small actions like adjustment, minor repairs to redesign of equipments
– Generally once taken and completed fully
Usually carried out in four steps :
1st step : collection of data, information and Analysis
2nd step : identifying the causes
3rd step : find out the best possible solution to illuminate likely causes
4th step : Implement those solutions
Emergency maintenance
It is carried out as fast as possible in order to bring a failed machine or facility to a safe and operationally efficient condition.
Routine maintenance
Routine maintenance which includes those maintenance activities that are repetitive and periodic in nature such as lubrication, cleaning, and small adjustment.
Running maintenance
Running maintenance which includes those maintenance activities that are carried out while the machine or equipment is running and they represent those activities that are performed before the actual preventive maintenance activities take place.
Opportunity maintenance
Opportunity maintenance which is a set of maintenance activities that are performed on a machine or a facility when an unplanned opportunity exists during the period of performing planned maintenance activities to other machines or facilities.
Window maintenance
Window maintenance which is a set of activities that are carried out when a machine or equipment is not required for a definite period of time.
Shutdown preventive maintenance
Shutdown preventive maintenance which is a set of preventive maintenance activities that are carried out when the production line is in total stoppage situation.
Remedial maintenance
Remedial maintenance which is a set of activities that are performed to eliminate the source of failure without interrupting the continuity of the production process.
Deferred maintenance
Deferred maintenance which is a set of corrective maintenance activities that are not immediately initiated after the occurrence of a failure but are delayed in such a way that will not affect the production process.
Shutdown corrective maintenance
Shutdown corrective maintenance which is a set of corrective maintenance activities that are performed when the production line is in total stoppage situation.
Design-out maintenance
Design-out maintenance which is a set of activities that are used to eliminate the cause of maintenance, simplify maintenance tasks, or raise machine performance from the maintenance point of view by redesigning those machines and facilities which are vulnerable to frequent occurrence of failure and their long term repair or replacement cost is very expensive.
Engineering services
Engineering services which includes construction and construction modification, removal and installation, and rearrangement of facilities.
Shutdown improvement maintenance
Shutdown improvement maintenance which is a set of improvement maintenance activities that are performed while the production line is in a complete stoppage situation.
Predictive maintenance
Predictive maintenance is a set of activities that detect changes in the physical condition of equipment (signs of failure) in order to carry out the appropriate maintenance work for maximising the service life of equipment without increasing the risk of failure.
It is classified into two kinds according to the methods of detecting the signs of failure:
– Condition-based predictive maintenance
– Statistical-based predictive maintenance
• Condition-based predictive maintenance
Condition-based predictive maintenancedepends on continuous or periodic condition monitoring equipment to detect the signs of failure.
• Statistical-based predictive maintenance
Statistical-based predictive maintenance depends on statistical data from the meticulous recording of the stoppages of the in-plant items and components in order to develop models for predicting failures.
The drawback of predictive maintenance is that it depends heavily on information and the correct interpretation of the information.
Some researchers classified predictive maintenance as a type of preventive maintenance.
The main difference between preventive maintenance and predictive maintenance is that predictive maintenance uses monitoring the condition of machines or equipment to determine the actual mean time to failure whereas preventive maintenance depends on industrial average life statistics.