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- Maintenance of technical installations in buildings based on asset life cycle analysisPublication . Sobral, José; Gaspar, D.; Almeida, N.This paper shows the importance of maintenance in buildings regarding the availability, reliability, maintainability, safety, and costs (RAMS+C) of the physical assets that make part of technical installations, taking into consideration all their life cycle. Some important standards related to asset management and maintenance are referred and some methodologies are described helping to understand the potential application to buildings of such tools that are often used in the industrial field. As fire is one of the major concerns when analyzing all potential risks in buildings and as it is common to install fire protection systems in a way to prevent fire occurrence or to protect buildings against such events, the paper also presents an illustrative example related to a fire extinguishing system showing the applicability of the referred concepts and methodologies and the importance of its maintenance. Some studies state that when facing a fire about one-third of the safety systems do not work properly just because of the lack of inspection, test, or maintenance of such systems.
- Preventive maintenance of critical assets based on degradation mechanisms and failure forecastPublication . Sobral, José; Guedes Soares, CarlosWhen dealing with critical physical assets it is very important to monitor some parameters just to observe and predict the potential time to failure and thus establish a preventive maintenance activity avoiding the unwanted failure occurrence and its consequences. According to periodic (or continuous) data gathered along the time concerning selected parameters it is possible to observe tendencies and determine time to failure, assuming a pre-defined value as the critical one, corresponding to asset failure. The present paper deals with this type of condition monitoring outlining the importance of predicting time to failure and illustrating it with an example where the evolution of a degradation parameter on time for several similar assets is observed and, based on that, the time to failure is determined, allowing to establish the right moment for maintenance for these type of assets operating in these conditions.
- Maintenance of fire sprinkler systems based on the dynamic assessment of its conditionPublication . Sobral, José; Ferreira, LuísSafety is one of the major concerns of process safety engineers in most industrial facilities all over the world. To this scope, some events play an important role once the effect of their consequences can be assumed as totally undesirable. One of these events refers to the occurrence of a fire. Such event can result in catastrophic consequences for life, equipment, and continuity of activities or even leading to environmental damage. A fire protection equipment with low reliability means that this equipment are often unavailable and thus the risk of a fire increases. Maintenance of fire protection equipment is very important because this kind of systems is mostly in a dormant mode, which gives uncertainty about their operability when demanded in a real situation of fire. This article outlines the importance of tests, inspection, and maintenance operations in the context of a fire sprinkler system and proposes a methodology based on international standards and supported by test/inspection reports to correct the frequency of these actions according to the level of degradation of the components and regarding safety purposes. © 2015 American Institute of Chemical Engineers.
- Measuring the efficiency of an industrial condition monitoring servicePublication . Sobral, José; Roque, A.The mode how industrial physical assets are maintained is very importante to assure high equipment availability. I tis importante to find a metric or a key indicator that will point out the effectiveness of such function. Once condition based maintenance is widely assumed to be one of the most importante maintenance strategies, it is fundamental to observe how assets are being monitored. The purpose of this pape is to observe the performance of the condition monitoring service within all maintenance activities. With this goal it is possible to determine the efficiency of this service and identify the gaps regarding the maximum achievable efficiency. The methodology or approach used called Overall Service Efficiency (OSE) refers to the Organization of the condition monitoring service, the Competencies and abilities of human resources affected to the service and the Interface between condition monitoring and other services inside the organization.