What is Preventive Maintenance?
What is Preventive Maintenance Strategy?
Preventive Maintenance, as known as Preventative Maintenance is a type of maintenance strategy where repair activities are carried out on machines to prevent it from their complete breakdown.
So, it is performed prior to full machine failure unlike reactive maintenance.
Preventive Maintenance can be also viewed as an intermediate maintenance strategy in terms of complexity between the reactive and predictive types of maintenance.
What are the types of Preventive maintenance?
Preventive Maintenance is carried out in two ways namely, time-based and run-hour or usage-based.
Run-hour Preventive Maintenance
In Run-hour type of Preventive Maintenance, the maintenance plans are created after certain hours, or kilo-meters or production cycles of a rotating machine.
Periodic Preventive Maintenance
In the Periodic type of preventive maintenance, the maintenance plans are created after certain fixed time intervals.
When Preventive Maintenance strategy is required?
FOR CRITICAL ROTATING ASSETS
You need to adopt the preventive maintenance strategy for machines which fulfill the following criteria:
- The machine is critical
- The machine failures can be avoided by regular maintenance
- The machine has a higher chance of failure with continuous operation
When Preventive Maintenance Strategy is NOT required?
FOR SMALL ROTATING ASSETS
You don’t need to perform the scheduled based repairs on machines that are not critical, ie which doesn’t affect the production process directly. Eg. small motors, small pumps, etc.
You would be saving more with reactive or breakdown maintenance applied to them, as each time a maintenance work will just increase your overall maintenance expenditure.
What are the advantages of using the Preventive Maintenance strategy?
Advantages over the Reactive Maintenance
Preventive Maintenance is always planned as compared to Reactive Maintenance.
So, you can save many overhead costs which came along with reactive maintenance. This includes the high cost of spare parts in case of emergency due to high shipping charges, and high maintenance costs due to prolonged repair work needed.
The production loss will also be less due to shorter repair time and technicians will be safer while doing their work due to the pre-planned nature of preventive maintenance as compared to the reactive maintenance.
This further gives a further edge to the Preventive maintenance over the reactive type of maintenance.
Advantages over the Predictive Maintenance and Condition-Based Maintenance
You don’t need any initial investment cost of set up like in Predictive maintenance or condition monitoring devices/equipment required in Condition-based maintenance.
What are the disadvantages of using the Preventive Maintenance strategy?
Disadvantages over the Reactive Maintenance
As preventive maintenance is planned, you need to spend some amount as well as time on the planning and strategy of repair work whenever it is required to be carried out.
Disadvantages over the Predictive Maintenance or Condition-Based Maintenance
In preventive maintenance, it costs you each time when you are carrying out the repair work. So, this adds the maintenance costs over time, unlike the condition-based and predictive maintenance where you can schedule the repair based on the condition of your asset.
Also, read the Advantages of Predictive Maintenance.