What is the Difference between Preventive and Predictive Maintenance?

Answer 1

- Preventive maintenance is changing the oil of your car every 5000 miles : You do not know if your car would have broken if you did not change the oil, but you know it will prevent it to fail.
- Predictive maintenance : Analysing the harmonics of a bearing periodically to check if it is going to fail, you will change only if the analysis show that the risk of failing has increased.

First one is safer but can be costly, second one is better if you have a way to predict the failure.

Answer 2

This Site Might Help You.

RE:
What is the Difference between Preventive and Predictive Maintenance?

Answer 3

preventive maintenance is maintenance carries out without actual data. its like changing your tires every 100,000 miles because generally they last that long. Predictive maintenance is using actual data. For the same example measuring tread depth at time intervals to calculate when its time to change tires.20,000 miles tread depth is 10% wear therefor change tires at 200,000 miles. This kind of maintenance is preferred to preventive maintenance but requires more data and time to accumulate it. Also it works best when operating parameters dont change very much over time.

Answer 4

predictive maintenance is based on the condition of the equipment .while preventive maintenance is carried out on regular intervals

Answer 5

Preventive maintenance is generally carried out to prolong the useful working life of machines and it’s generally based on past experience or manufacturers recommendations.

Wear and tear are two occurrences that nobody can avoid. However well you carried out preventive maintenance, it’s going to fail some day but before that, ample warnings are usually given – in the form of NOISE, VIBRATION and TEMPERATURE. This is where predictive maintenance comes in. Basing again on past experience or techniques such as analysis of oil etc, mechanics and engineers are able to schedule a shut down and repair before a breakdown that affects production schedule (stoppage) happens. Depending on the techniques used, they are often able to predict quite accurately the problems parts and standby replacements so as to minimize downtime.

In the case of electrical powered machines, the increase in power consumption (amp. meter reading) is usually a sign that the motor is working harder than normal – symptom that something is going to give way soon.

I would go further and contend that predictive maintenance is a part of preventive maintenance – actually a technique used in preventive maintenance. All are done to prevent unforeseen shutdowns and maximize the working life of machines.

Predictive maintenance tends to include direct measurement of the item. Example, an infrared picture of a circuit board to determine hot spots.

Preventive tends to be done on time schedules (as you have.) Predictive tends to be direct measurement of the item to determine if it needs maintenance.

Other examples of Predictive Maintenance - evaluation of particles in suspension in a lubricant, sound and vibration analysis of a machine.

PdM or condition based maintenance attempts to evaluate the condition of equipment by performing periodic or continuous (on-line) equipment monitoring. The ultimate goal of PdM is to perform maintenance “just in time”, before the equipment fails in service. This is in contrast to time and/or operation count based maintenance where a piece of equipment gets maintained whether it needs it or not. Time based maintenance is labor intensive, ineffective in identifying problems that develop between scheduled inspections and is not cost effective.

Most PdM inspections are performed while equipment is in service, thereby minimizing disruption of normal system operations. Adoption of PdM in the maintenance of equipment can result in substantial cost savings and higher system reliability.

Answer 6

preventative = routine maintainance to prevent failure. Predictive = monitoring machinery and using information to carry out maintenance.

Answer 7

Preventive is a sure thing, which means if you doesn't obey the certain factors, certain things will happen. Whereas predictive is somr sort of 'I think this will happen'. Predictive doesn't consist of logical thinking or science methods. The chances of happening may be low. Like we use pesticide to prevent pest, that's preventive maintainance. But I think these days the weather are quite hot, so I water more water on plants to keep them alive.

Answer 8

it`s very simple
predictive= you know you`re going to get a flat tire one day so you carry a spare tire
preventive= you check your tires regularly for low pressure, wear, alignment to make the tires last longer