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Óleos Lubrificantes: Metodologias de Análise
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A análise de rotina de óleos usados desempenha um papel fundamental na manutenção e pre-servação da maquinaria em que este opera, uma vez que a deteção precoce da contaminação ou degradação do óleo poderá prevenir danos nos equipamentos em causa. O facto de existir uma elevada procura de prestação de serviços nesta área, e de o laboratório já possuir os aparelhos necessários para a maioria dos ensaios, levou ao interesse da implementação de um conjunto de análises de óleos lubrificantes, com efeito imediato, no laboratório de Recursos Naturais da SGS, em Sines. Assim, foram implementados os métodos de determinação da densidade, viscosidade cinemática, TAN, teor de clo-retos orgânicos, espetroscopia de infravermelho por FT-IR e teor de água por titulação de Karl Fischer.
Após a implementação de todas as metodologias, estas foram testadas e comprovadas tendo como base as respetivas normas e padrões aceites internacionalmente, de forma a avaliar a precisão e exatidão dos métodos estudados. Os métodos de determinação da viscosidade e de espetroscopia de infravermelho por FT-IR revelaram-se métodos bastante repetíveis e exatos, sendo os únicos mé-todos para os quais foi possível adquirir MRC. Os restantes métodos, densidade, TAN, teor de água por titulação de Karl Fischer.e teor de cloretos orgânicos apenas foram avaliados tendo em conta a sua repetibilidade. Este parâmetro foi avaliado e comprovado, sendo considerado que todos os métodos produzem resultados repetíveis.
Após a conclusão do trabalho, o laboratório passou a conseguir realizar a avaliação de confor-midade de óleos lubrificantes, tendo como base as normas de referência e especificações dos produtos e mercado, conseguindo dar resposta de qualidade a uma nova matriz, assim como angariar um novo conjunto de clientes.
Routine analysis of used oils plays a fundamental role in the maintenance and preservation of the machinery in which it operates, since early detection of oil contamination or degradation can prevent damage to the equipment. The fact that there is a high demand for services in this area, and that the laboratory already had the necessary equipment for most of the tests, led to the interest in the imple-mentation of a set of analysis of lubricating oils, with immediate effect at the SGS Natural Resources laboratory, in Sines. Thus, the methods for determining density, kinematic viscosity, TAN, organic chlo-ride content, infrared spectroscopy by FT-IR and water content by Karl Fischer titration were implemen-ted. After the implementation of all methodologies, they were tested and proven based on the respec-tive internationally accepted norms and standards, in order to assess the precision and accuracy of the methods studied. Viscosity determination and FT-IR infrared spectroscopy methods proved to be very repeatable and accurate methods, being the only methods for which it was possible to acquire MRC. The remaining methods, density, TAN, water content by Karl Fischer titration and organic chloride con-tent were only evaluated taking into account their repeatability. This parameter was evaluated and pro-ven, and it was considered that all methods produce repeatable results. After the work was completed, the laboratory was able to carry out the conformity assessment of lubricating oils, based on reference standards and product and market specifications, managing to pro-vide a quality response to a new matrix, as well as attract new sets of customers.
Routine analysis of used oils plays a fundamental role in the maintenance and preservation of the machinery in which it operates, since early detection of oil contamination or degradation can prevent damage to the equipment. The fact that there is a high demand for services in this area, and that the laboratory already had the necessary equipment for most of the tests, led to the interest in the imple-mentation of a set of analysis of lubricating oils, with immediate effect at the SGS Natural Resources laboratory, in Sines. Thus, the methods for determining density, kinematic viscosity, TAN, organic chlo-ride content, infrared spectroscopy by FT-IR and water content by Karl Fischer titration were implemen-ted. After the implementation of all methodologies, they were tested and proven based on the respec-tive internationally accepted norms and standards, in order to assess the precision and accuracy of the methods studied. Viscosity determination and FT-IR infrared spectroscopy methods proved to be very repeatable and accurate methods, being the only methods for which it was possible to acquire MRC. The remaining methods, density, TAN, water content by Karl Fischer titration and organic chloride con-tent were only evaluated taking into account their repeatability. This parameter was evaluated and pro-ven, and it was considered that all methods produce repeatable results. After the work was completed, the laboratory was able to carry out the conformity assessment of lubricating oils, based on reference standards and product and market specifications, managing to pro-vide a quality response to a new matrix, as well as attract new sets of customers.
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Óleos Lubrificantes Precisão Exatidão Material de Referência Certificado Especificação