Corrective Maintenance (CM)
Corrective maintenance (CM), as name suggests, is maintenance strategy that is used to correct something in its normal working condition. Whenever any equipment or asset gets failed, one needs to identify main problem and then make decision regarding whether particular equipment should require either repair or replacement. CM is a type of maintenance strategy that is generally required when an asset i.e. equipment, component, part of equipment, etc. gets failed or stops working or gets damaged, simply to bring assets back to their normal working condition. An asset can be corrected either by replacing it or repairing it. Its main aim is generally to restore broken assets or equipment. One can say that it is basically a rectification process that is mainly implemented after occurrence of failure or breakdown. CM can also be used as part of wider strategy to plan your maintenance strategy. There are several situations when such maintenance occurs :
- Whenever any problem is detected using condition monitoring.
- Whenever a potential fault is identified while routine inspection.
- Whenever an asset or equipment fails or breaks down.
Objectives of Corrective Maintenance (CM) :
- Main aim of CM is to prevent production loss. For preventing production loss, CM simply brings equipment or asset back into their normal working condition to reduce effect on production. Equipment failure can affect cost of production, product quality, and customer satisfaction.
- Another main objective of CM is to effectively repair each failed piece of equipment. CM has to perform an appropriate number of repairs until failed equipment is bought back to its working condition.
- Another objective is to manage appropriate repair costs for each failure of equipment.
- Another objective is simply to reduce future chances of failure. CM simply makes sure to avoid any sudden failure that can be more severe in future.
- Another objective is to manage replacement cost that is required for backup equipment.
Basic characteristics of Corrective Maintenance (CM) :
- CM can be both i.e. either planned or unplanned.
- In such maintenance strategy, maintenance task is assigned only after occurrence of failure or breakdown and that too within given period of mine.
- Failure that is needed to be corrected should be less severe. CM is only effective if failure maintenance is less severe in nature.
- Corrective maintenance makes sure that particular equipment failure should not affect overall production loss by simply correcting it and bringing equipment back to its normal working condition.
When to use CM? It’s obvious that, at certain times, assets or equipment generally break down or gets failed. Maintenance team usually perform maintenance task in order to repair or replace failed equipment. Main question that arise is when one should use CM over another maintenance strategy because there are many maintenance strategies available nowadays. This decision of choosing CM mainly depends upon how fast equipment can be repaired if a problem occurs, reliability of a particular asset, and the cost of downtime. Sometimes performing corrective maintenance can be more costly than other performing types of maintenance. But it’s better for one to prevent equipment from failure by performing preventive maintenance rather than performing corrective maintenance.