Preventive Maintenance

Preventive Maintenance Definition :
Preventive Maintenance deals, by definition, with all tasks that are performed at
predetermined (fixed) intervals. This includes all inspection types, measurement and
data gathering and scheduled component replacement.

Preventive maintenance: goal is to reduce the incidence of breakdowns or failures in the plant or equipment to avoid the associated costs.
        The primary goal of preventive maintenance is to prevent the failure of equipment before it actually occurs

Preventive maintenance is periodic Result of planned inspections According to calendar 
After predetermined number of hours

Principle – “Prevention is better than cure”

“The maintenance carried out at predetermined intervals and intended to reduce the probability of failure or the performance degradation of an item”

Preventive Maintenance – Condition monitoring

• Walk-Around Inspection
• Vibration Analysis
• Oil Analysis
• Wear Measurements
• Non-Destructive Testing
• Electric Motor Diagnostics
• Thermography 

Predictive (Condition-based) Maintenance 

1.       In predictive maintenance, machinery conditions are periodically monitored  and this enables

2.       the maintenance crews to take timely actions,such as machine
     adjustment,repair or overhaul

3.       It makes use of human sense and other sensitive instruments, such as

4.       audio gauge, vibration analyzer, amplitude meter, pressure, temperature and resistance strain gauges etc

5.       Unusual sounds coming out of a rotating equipment predicts a trouble

6.       An excessively hot electric cable predicts a trouble

7.       Simple hand touch can point out many unusual equipment conditions and thus predicts a trouble

Replacement - A replacement strategy based on predetermined intervals can be part of a preventive maintenance when...

1. cost associated to monitor the component is higher than the cost of replacing

2. There is a clear relationship between failure probability and component age

Service - There are many items that need to be serviced on a pre-determined interval.

o   Like Lubrication Programme

o   Calibration

o   Function Testing

o   Alignment

o   Cleaning

Benefits of Preventive Maintenance:

·         Reduces break down and thereby down time 

·         Lass odd-time repair and reduces over time of crews

·         Greater safety of workers

·         Lower maintenance and repair costs

·         Less stand-by equipments and spare parts

·         Better product quality and fewer reworks and scraps

·         Increases plant life

·         Preventive maintenance is a schedule of planned maintenance actions aimed at the prevention of breakdowns and failures.

Preventive Maintenance % Calculation

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