Basically there are two types of maintenance tasks they are
Planned maintenance may further be classified into
Preventive maintenance Corrective maintenance Predictive maintenance
Condition based maintenance Reliability centered maintenance
The main objectives of this program are to
Eliminate deviations from optimum operating conditions
Eliminate unnecessary repairs
Optimize all critical plant systems Preventive maintenance
It is a maintenance program which is committed to the elimination or prevention of corrective and break down maintenance.
Benefits of preventive maintenance
It maintains the equipment in good condition to preventin them from bigger problems.
Prolongs the effective life of the equipments. Detects the problem at earlier stages.
Minimize/eliminates the rework/scrap and helps in reducing the process variability.
Significantly reduces unplanned downtime.
Predictive maintenance is a management technique that uses regular evaluation of the actual operating conditions of the plant equipment. Benefits of preventive maintenance
Reduced breakdown losses.
Reduction of quality defects. Increased net operating profit Reduced maintenance costs
Condition based maintenance techniques Vibration Monitoring
Determines the actual conditions of equipments/machines by studying the noise or vibration produced during functioning.
Determines the condition of plant machinery, systems etc. by studying the emissions of infra red energy i.e. temperature
Reliability Centered maintenance
The rough process of RCM is as follows
1. Target products or systems of maintenance should be clearly identified and necessary data should be collected
2. All possible failures and their effect on target products or systems are systematically analyzed
Application of RCM
When designing, selecting and installing new systems in a plant.
When setting up preventive maintenance for complex equipment and systems for which we are not clear on how they work.
When teaching people the basics of reliability it helps to explain the matters in a detailed fashion using RCM.