Preventive vs Predictive Maintenance: Differences, Advantages, and Disadvantages

A successful company cannot base the management of its assets solely on corrective maintenance, but must aim for strategies to prevent problems and damages, with the help of the right facility management software.

The main strategies to use are certainly preventive maintenance and predictive maintenance, which, although both rely on a proactive approach, have some peculiar differences. Let’s analyze them together in this article!

What is preventive maintenance?

Preventive maintenance is the set of ordinary procedures, carried out regularly and independently of the state of the machinery and their actual need for maintenance, aimed at keeping equipment in good condition, preventing damage from occurring prematurely, and reducing the risk of accidents.

Preventive maintenance operates based on machine learning, analysis of operational data, and asset monitoring. Thanks to the data and information obtained, technicians can optimize maintenance and reduce reliability and operational risks. Obviously, the entire process is facilitated and optimized by the use of facility management software designed to support preventive maintenance, track activities, and manage identified issues.

Effective preventive maintenance is planned and scheduled based on usage, manufacturer recommendations, and especially proactive monitoring of internal resources; this way, it is possible to intervene promptly, increasing the lifespan of resources and reducing downtime.

For more details, read the in-depth article on the types of preventive maintenance and how to implement it.

What is predictive maintenance?

Predictive maintenance is a maintenance technique that monitors the performance and conditions of equipment and various parts of the asset to be maintained and, through the analysis of the collected data, identifies possible anomalies and/or defects so that they can be corrected before any failures occur.

This type of maintenance, often referred to by the acronym PdM which stands for Predictive Maintenance, was introduced in the 1990s and has as its main objective to predict failures based on certain parameters and factors. Once the prediction of failures is made, maintenance managers can take the necessary measures to prevent the anticipated failures from occurring.

Differences between preventive and predictive maintenance

As you can understand from what we have said so far, preventive maintenance and predictive maintenance share the same purpose. Despite this, the two types of maintenance differ from each other, and we could even say that predictive maintenance is a more advanced and sophisticated form of preventive maintenance. Both aim to proactively prevent failures and increase the reliability and lifespan of assets. However, predictive maintenance is a much more advanced form of this concept. Let’s now analyze the main differences together.

Approach and methodology

The first and substantial differences between the two types of maintenance are evident in the approach and methodology followed.

Preventive maintenance bases its methodological approach on regular and planned interventions regardless of the actual need for maintenance of the resource. For example, considering a single piece of equipment, applying preventive maintenance would likely refer to the brand and model of the equipment and the indications provided by the manufacturer or supplier. With this general data, we would formulate approximate estimates on when to perform maintenance.

Predictive maintenance, on the other hand, is much more precise and bases its approach on a greater amount of data. Returning to the example of a single piece of equipment, to apply the predictive method, we would need general information about the expected lifecycle for that specific model of asset, as well as historical data on its performance. Thanks to this new and more substantial information package, predictive maintenance models can provide effective forecasts to technicians who will know exactly when to intervene before a failure occurs.

Costs and benefits

What was said in the previous paragraph helps us understand that the methodology followed by each type of maintenance affects not only the reliability of resources but also the costs of the maintenance process itself.

With preventive maintenance, there is a risk of performing an intervention that is indeed proactive and therefore certainly useful, but it may also turn out to be unnecessary or superfluous at that particular moment, precisely because it is planned based on general and predetermined data.

In contrast, scheduled repairs through predictive maintenance do not occur according to a general calendar but exactly before they are necessary. This way, the resource remains reliable and safe while avoiding unnecessary interventions, thus reducing costs.

From a cost perspective, therefore, predictive maintenance guarantees greater savings, which is certainly a benefit. However, both types also present other advantages; let’s see what they are.

Preventive maintenance

• is cheaper to implement;
• increases the lifespan of resources;
• increases the productivity of machinery;
• reduces unplanned downtime.

Predictive maintenance

• immediate identification of real problems on machinery;
• greater inventory efficiency;
• reduction of material costs;
• shorter maintenance times.

Predictive maintenance becomes even more effective when combined with the Internet of Things (IoT).

Thanks to IoT sensors, predictive maintenance models receive real-time data on the activities and conditions of assets, thus generating maintenance forecasts based on real and updated data.

Predictive maintenance: asset data monitoring[/caption>

When to Opt for Preventive Maintenance and When for Predictive Maintenance

Both types of maintenance analyzed in this article (to deepen your knowledge on other maintenance types applicable to your assets, read the article “Types of Maintenance: Here is a Detailed List“) represent a proactive approach to maintenance that ensures the functionality of the resource, but the choice of one type over another will be dictated by factors related to initial economic and technological availability.
Indeed, while preventive maintenance carries the risk of acting on non-existent damages, causing economic and time losses, on the other hand, predictive maintenance can prove to be a more complex strategy to implement, with a greater need for:

• new technologies;
• specialized personnel;
• specific training;
• higher initial costs.

For summary purposes, below you will find a table that will help you fully understand the differences and key features of each of the two maintenance types analyzed in this article.

Differences between preventive and predictive maintenance

How to implement preventive and predictive maintenance strategies

Preventive maintenance is based on a precise and accurate planning that prevents sudden breakdowns of equipment. This type of strategy is effective in the case of machinery that is important within the production process.

Predictive maintenance, through monitoring the performance and conditions of equipment, identifies possible anomalies and/or defects before they occur. This type of strategy is extremely useful for plants that need to last a long time and for which continuous improvement of their performance is necessary.

The components necessary for the implementation of predictive maintenance are:

• data collection and pre-processing;
• fault detection;
• time-to-failure prediction;
• scheduling;
• resource optimization.

Ideally, however, asset management should involve both strategies, and the first step you can take to introduce yourself to this world is definitely to try a facility management software.

In this way, in a single solution, you can plan and manage scheduled maintenance activities with continuous notifications while constantly monitoring your assets, analyzing real performance based on specific Key Performance Indicators (KPI) and Service Level Agreements (SLA).

FAQ – Difference between preventive and predictive maintenance

What are the main advantages of preventive maintenance?

• Reduces the likelihood of sudden failures.
• Allows for simplified maintenance management.
• Helps keep equipment operational for longer.
• Improves plant safety and reduces the risk of accidents.
• Increases operational efficiency through a more structured organization of interventions.

What are the limitations of preventive maintenance?

• Does not take into account the actual conditions of the equipment, relying on a fixed schedule.
• May require scheduled downtimes that are unnecessary if the machinery is still efficient.
• Is not always the optimal solution for complex plants, where real-time monitoring would be more effective.
• Can generate waste of resources and materials, having to replace components that are still functioning.
• Requires rigid organization and detailed planning, increasing management complexity.

What is an example of preventive maintenance?

An example of preventive maintenance is the periodic inspection and cleaning of air conditioning systems in a building. Even if the system seems to be functioning correctly, regular maintenance of filters, ducts, and ventilation units prevents the accumulation of dust and debris, improving energy efficiency and indoor air quality. This type of intervention reduces the risk of sudden failures and extends the system’s lifespan, ensuring a comfortable and safe environment for occupants.

What benefits does predictive maintenance offer?

• Allows for more efficient use of resources, reducing waste and optimizing maintenance costs.
• Prevents serious failures through constant monitoring of asset conditions.
• Increases overall productivity by reducing downtime and ensuring more stable operation of equipment.
• Promotes greater asset longevity by allowing interventions only when necessary and reducing premature wear.
• Supports strategic maintenance planning, making interventions more precise and effective through predictive analysis.

What disadvantages does the adoption of predictive maintenance entail?

• Requires initial investments in technology and training.
• Data analysis can be complex and require specific skills.
• May not be cost-effective for less critical or lower-value assets.

What is an example of predictive maintenance?

A practical example of predictive maintenance is the use of sensors to monitor the vibrations of an industrial motor. If the sensors detect an abnormal increase in vibrations, the predictive analysis system signals a possible imminent problem, such as bearing wear or misalignment. This allows for targeted intervention to be scheduled before a failure occurs, avoiding costly machine downtime and reducing the risk of greater damage.

What is meant by improvement maintenance?

Improvement maintenance, also known as proactive maintenance, is a preventive maintenance strategy aimed at addressing the root causes of failures to anticipate and avoid more serious damage to assets. It is based on revision interventions aimed at improving the performance of an asset or a part of it.

What is the difference between preventive and corrective maintenance?

Preventive and corrective maintenance are both part of routine maintenance, while preventive maintenance is performed to prevent failures from occurring, corrective maintenance, also known as breakdown maintenance, involves intervening on machinery or equipment following damage, with the aim of restoring functionality.

What is scheduled preventive maintenance?

Scheduled preventive maintenance is that which is performed at regular intervals, regardless of the condition of the equipment or machinery.