State types of maintenance. Explain each with example.

State types of maintenance. Explain each with example. 
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Answer :

Maintenance are classified as below:-

1. Preventive Maintenance (PM) 2. Routine /daily maintenance 3. Periodic maintenance/Time based maintenance (TBM) 4. Predictive maintenance (PDM) 5. Breakdown Maintenance /maintenance on fault / Corrective maintenance 6. Productive maintenance/ Total productive maintenance (TPM) 7. Overhaul maintenance / Zero hours maintenance

1. Preventive maintenance: - PM means systematic inspection, detection, correction and take action to prevent a problem from occurring or reoccurring. OR It can also be defined as “anything that increases the life of equipment, and helps it runs more efficiently.” 

2. Routine maintenance is a simple, small-scale activities (usually requiring only minimal skills or training) which is carried out daily to keep and general upkeep of an equipment, machine, plant, or system in good working condition. 

 3. Time based maintenance or Periodic maintenance consists of periodically (at predetermined intervals) inspecting, servicing and cleaning equipment and replacing parts to prevent sudden failure and process problems. Periodic maintenance is pre-set schedule activity which is carried out weekly, fortnightly, monthly, quarterly or half yearly interval depending upon the equipment’s and condition of the machine or as per manual provided by manufacturer. 

 4. Predictive maintenance is a maintenance to monitor, predict and prevent occurrences of failure of equipment, OR Predictive maintenance is a maintenance to replace components just before they fail. OR This is a method in which the service life of important part is predicted based on inspection or diagnosis e.g. it is necessary to identify physical variables such as temperature, vibration, power consumption, etc. If these variation is indicative (abnormal) than there is a problemto be appearing on the equipment so suitable action is taken before major failure. 

5. Breakdown maintenance means is carried out when an equipment fails or does not work satisfactory OR It is a maintenance which is carried out when machine fail to run. 

 6. TPM means the maintenance which is carried out only when equipment /machine fail to run. TPM is preferred under following circumstances:-  Demand of the product is more so machine may not find time to put the machine for preventive maintenance 

7. Overhaul means complete shutdown, dismantling, repair and reassembly of equipment/machine. It is carried out depending upon working hours of machine & conditions or as directed in service manual provided by the manufacturer. It involves partial or complete dismantling of the equipment/machine and overhaul.
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