Predictive maintenance (PdM) always seemed like the perfect use case for the Internet of Things (IoT), more specifically for Industrial IoT (IIoT) and environments where uptime of specific assets is critical and breakdowns can have important consequences for several reasons.
No wonder that predictive maintenance is one of the most often mentioned use cases in Industry 4.0. PdM isn’t just about smart manufacturing, though. Industries/segments with predictive maintenance as a use case further include transportation, oil and gas, and ample segments with critical power environments. Simply put: where it makes the most sense.
Many of the main technologies which are often cited in the context of Industry 4.0 (can) play a role in predictive maintenance and its evolutions: big data, AI and ML (artificial intelligence and machine learning), IoT, cloud computing, data analytics and, increasingly, edge computing and digital twins.
IIoT, in combination with predictive analytics and ML, however, are the main drivers of the more mature stage of predictive maintenance.
Actionable, often real-time, data on pre-defined factors are gathered from sensors and predictive analytics algorithms are applied to predict when something might occur – and thus proactive maintenance, called predictive in this case, is needed.
The idea behind predictive maintenance is simple and attractive enough and is similar to other forms of proactive maintenance with some additional benefits (and disadvantages): unexpected failure of equipment with all related consequences can be avoided, and maintenance can occur before something happens, instead of after the facts (known as reactive maintenance). So, predictive maintenance is one of the maintenance methods enabling to do this kind of proactive maintenance and takes most time and skills to implement. In other words: it’s important to use it where it makes true sense.
Predictive maintenance and condition monitoring
The usage of predictive maintenance is less common-place than providers of solutions would like, and customers, except for specific verticals and segments, so far have been slower to adopt it than was expected in the earlier days of the Internet of Things. However, things are starting to change again.
In the scope of this article, we define predictive maintenance in correlation with the mentioned technologies and related systems (e.g., CMMS or Computerized Maintenance Management System). The reason: predictive maintenance as such isn’t new and in the traditional sense not even necessarily related to these technologies at all since simple – human visual and instrument – inspections also enable predictive maintenance in the strict sense.
Along with real-time condition monitoring (more below), these can be seen as evolutions in PdM whereby the more ‘modern’ and mature state of predictive maintenance has, among others, been called PdM 4.0 (it is not the only model), with the 4.0 obviously referring to Industry 4.0 and its smart factory, and with PdM 4.0 as this fourth stage of maturity in the evolution of predictive maintenance if you will.
The downsides of reactive maintenance (a.k.a. breakdown maintenance) whereby equipment/assets get repaired after having broken down are clear enough. This doesn’t mean that reactive maintenance is bad of course. Well, on the contrary, reactive maintenance in many cases is part of a strategic choice and the type of maintenance depends on many factors such as the consequences of equipment failure and whether it’s commercially or otherwise interesting to invest in more proactive maintenance methods or not (and if so, in which one).
Yet, with assets that are critical and need to be available at all times for one or the other reason (ample examples where equipment failure can result in astronomic costs, huge reputation damage or even worse), alternative options are better, even if they come with more planning and up-front investments. It all depends on the importance of the asset from a broader perspective.
So, predictive maintenance is one of those means to act before something breaks down (proactive maintenance), rather than after the facts. Another form of proactive maintenance is preventive maintenance that also focuses on decreasing the chance that something goes wrong.
Predictive maintenance is often called condition monitoring. Yet, that’s not correct: there are differences. Real-time condition monitoring is seen as an earlier maturity stage in the bigger predictive maintenance monitoring picture of PdM 4.0.
We won’t elaborate too much on that for now since both condition-based monitoring and predictive monitoring as it’s understood today are far from omnipresent but if you want to know more check out this blog post by Jan Burian, Research Director, IDC Manufacturing Insights on the changing role of enterprise maintenance in manufacturing.
Condition monitoring and predictive maintenance compared in a nutshell:
Condition monitoring looks at pre-defined parameters (e.g., with vibration analysis and diagnostics, oil analysis, motor condition monitoring and motor current signature analysis, or whatever type of technique that’s relevant for the monitored equipment) and compares the parameters with predefined thresholds whereby through visualization the condition of the machine can be checked.
Predictive maintenance uses ML engines with these parameters of the monitored equipment being used as a basis, but the actual difference concerning what the machine learning and predictions say what is likely to occur within a specific time frame and with a specific probability. Typically, this also means that predictive maintenance uses more data sources and sets than the sensor data from condition monitoring and digitally recorded data from the previous stage, instrument inspection.
The difference might seem small, but it’s not. Predictive maintenance uses monitoring data, but it uses more and, most importantly, does more with the data. It, indeed, predicts.
The presentation at the bottom of this blog goes a bit more in detail and makes the differences more tangible with additional information on what to consider when implementing predictive maintenance.
The predictive maintenance market and some words of advice
IoT Analytics expects the market for predictive maintenance solutions to reach $23.5B by 2024.
The graphic below shows that it is further estimated that in 2024, adopters of PdM will save $188B in costs on top of other benefits such as improved regulatory compliance and enhanced safety. You can also see some of the challenges and shifts concerning the adoption of predictive maintenance.
Obviously, there is much more research out there on the market. Stay tuned for more details, also concerning the industries that use PdM most with additional strategic advice regarding the usage of predictive maintenance and in the meantime check out the promised presentation below that is largely based on work from PwC.
Do take into account that several challenges had a negative impact on the adoption of PdM, however, which is food for a next contribution. For now, let’s conclude with some words of advice from IDC’s Jan Burian for the decision makers among you: “Condition monitoring and predictive maintenance of the complex production assets are still far from plug and play solutions. Detailed preparation on customization and final fine-tuning are crucial success factors. Deploy the advanced condition monitoring first and then look to where the predictive models could be deployed. Think about building digital twins of the assets and process and combine data from the asset aggregates, production process, and production environment”. More in his article.