Time Based Maintenance & Condition Based Maintenance

TBM ( TIME BASED MAINTENANCE) -

• It is also called a Periodic Maintenance coming under the Preventive Maintenance.
• The period of repair is chosen based on the parameter
• Production volume, pieces, or number of operating days.

Advantages :
It does not take manpower or time for inspection.

Disadvantages :
Repair cost are high because of over- maintenance.

Time Based Maintenance activities are selected on the basis of Equipment Supplier’s recommendation and past performance of the Equipment.
Periodic Inspection, cleaning, servicing, part replacement, lubrication and oil replacement activities are carried out at predetermined intervals to restore the Equipment deterioration.


CBM ( CONDITION BASED MAINTENANCE)

• Monitor and analyze the deterioration data regularly and constantly.
• Repair if the deterioration parameter reaches a predetermined critical value.

Advantages :
CMB can prevent over – maintenance, which is a problem with TBM.

Disadvantages :
Equipment diagnosis and monitoring system can be costly.

If Diagnosis is reliable, standard value can be set near the limit line.
This is the most economical method.
Predictive Maintenance highly depends on level of diagnostic techniques.
Wrong diagnosis is dangerous.