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What is sealing? Tightness is the quality of a closed enclosure that does not allow any fluid to pass through its walls. Obtaining and maintaining such a property is, in reality, a gradation of operations, and the hermeticity of an enclosure must be considered, even from a theoretical point of view, as illusory. A perfectly homogeneous structure can be permeated by gases, due to sorption and desorption at the solid's interfaces, and solution and diffusion within it. This complex process, known as permeation, varies greatly according to the nature of the elements involved. Gas permeation through metals, for example, is not usually likely to affect sealing, whereas gas permeation through elastomers can lead to ambiguities in leak detection.
This article presents the fundamentals of preventive maintenance, whose objective is to prevent the occurrence of failures. It provides a typology of the different forms of preventive maintenance, along with the associated tasks and activities. It traces the evolution of these practices from the 1950s to the paradigms of Industry 4.0 and 5.0. The article also details the classification of available techniques and technologies, the processing of information, and the criteria for selecting methods to define maintenance intervals. Finally, it presents the new principles of predictive maintenance based on RUL within the context of Industry 4.0 and 5.0.
This article explores predictive maintenance technologies and methods, addressing the challenges of implementation to ensure a return on investment. It examines the criteria for selecting critical equipment and the probabilistic nature of failures, emphasizing the key importance of estimating the Remaining Useful Life (RUL). Decision theory is then detailed to establish thresholds that prevent erroneous decisions. The technologies and data used are briefly presented, along with concrete examples and industry feedback on its advantages and limitations. Finally, the article concludes with perspectives on the future evolution of predictive maintenance.
This article describes the concepts of intelligent predictive maintenance in Industry 5.0. It begins by presenting the paradigm shift between Industry 4.0 and Industry 5.0, initiated in 2020 by the European Commission to emphasize human-centered approaches, sustainability, and resilience. The methods and tools related to the prediction of the remaining useful life (RUL) of equipment are described in detail. It identifies the contributions of AI, conversational agents, and the metaverse to predictive maintenance. Finally, it provides an overview of the applications in the industry, highlighting their advantages and disadvantages, particularly from an ethical standpoint.
This article describes the evolution of function maintenance, starting with maintenance seen as the repair of goods. It later evolved towards responsible maintenance, to facilitate corporate sustainable development. This evolution, along with new techniques to plan operations, is making maintenance a driving force for companies of the future. Organizational and operational tools enable the implementation of maintenance that will guide firms in their choices and strategies in line with sustainable development and social responsibility.
This article introduces the concepts of intelligent predictive maintenance for industry 4.0, whose goal is to predict the moment of occurrence of a failure to implement appropriate actions to avoid it. It provides a description of the concepts of Industry 4.0, also referred to as the industry of the future, which emerged as part of the digital transformation of businesses. After a reminder of terminology, the methods, and tools essential for the design of this maintenance strategy are developed. Finally, a review of its current implementations in the various industries is proposed highlighting its advantages and disadvantages.
The purpose of this article is to examine in turn the two main existing maintenance strategies: preventive maintenance and corrective maintenance. To make the right choice, it is necessary to be aware of and examine a number of criteria covering technical, economic, safety, environmental and quality aspects. The methodologies and tools available for implementing the different types of maintenance are described in detail.
The obsolescence of goods is a worrying situation for many industries. Awareness of its harmful effects, particularly in terms of sustainable development, is prompting public authorities to take action. The increasingly rapid renewal of off-the-shelf products and the hold of consumer markets over technologies are shortening their lifespan. While this affects electronics, it also affects a growing number of different types of equipment (electrical, electromechanical, lifting equipment, etc.) and complicates the maintenance of systems designed to be operated for a period that generally exceeds that of their components. It is therefore essential to combat the consequences of this component of technical progress, and to introduce asset obsolescence management within companies.
Maintenance its normative vocabulary is full of nuances, its areas of intervention are numerous and are aimed at a wide category of stakeholders, with little or very high qualifications and in very diversified fields (mechanics , hydraulics, aeraulics, refrigeration, thermal, electrical & electronics, etc.). Exercising this maintenance profession also means actively participating in energy efficiency and sobriety because it contributes to maintaining the assets in a sustainable state of operation and optimum performance. There are different levels and types of maintenance, as well as several associated methods, which will be explained in this article.
This article presents the Equipment Reliability Process Description AP913 developed by the Institute of Nuclear Power Operations (INPO) in the USA. AP913 integrates equipment reliability activities to maintain high levels of safe and reliable plant operation in an efficient manner. After a description of its origins and the key definitions, the steps in the flowchart of the AP913 process are developed. The chemical and volume control system (CVCS) of a pressurized water reactor is selected as an example. To conclude, some recommendations are given to help the reader implement the AP913 process.
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Bernard MECHIN
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