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Authors
Abstract(s)
Em Portugal, as Entidades Gestoras (EG) do setor da água potável estão obrigadas à comunicação anual ao regulador – Entidade Reguladora dos Serviços de Águas e Resíduos (ERSAR) - de um conjunto de indicadores que refletem o seu desempenho em diferentes domínios. Especificamente no que diz respeito à gestão de energia na elevação de água potável existe um indicador global (AA16ab), que se pretende que reflita as boas práticas das EG. Os cálculos efetuados indicam que em Portugal devem ser desperdiçados anualmente 100 GWh de energia elétrica na elevação de água, o que poderá equivaler a aproximadamente 10 milhões de euros. No presente trabalho estudou-se o estado da arte no que diz respeito a bombas centrífugas e a motores assíncronos e acompanharam-se três intervenções em bombas, tendo sido aplicados diferentes tipos de revestimentos e de metodologia de aplicação. Procedeu-se a uma comparação entre ensaios de desempenho: em fábrica, antes de intervenção de manutenção e após a intervenção de manutenção. Obtiveram-se melhorias de desempenho com as intervenções de manutenção, em certos pontos de funcionamento, que atingiram valores da ordem dos onze pontos percentuais (por exemplo de 64% para 75%). Com as bombas revestidas, foi possível superar o desempenho das bombas em fábrica, independentemente do produto que tenha sido aplicado. Paralelamente foi realizada a avaliação da condição das máquinas antes e após a intervenção, para se poder enquadrar a metodologia numa verdadeira política de gestão da manutenção.
In Portugal, the Managing Entities (ME) of the drinking water sector are obliged to communicate annually to the regulator – Regulatory for Water and Waste Services (RWWS) – a set of indicators that reflect their performance in different areas. Specifically, regarding energy management of drinking water in pumping stations, there is a global indicator (AA16ab), which is intended to reflect the good practices of ME. The calculations made, indicate that in Portugal 100 GWh of electricity should be wasted annually in the water pumping stations, which should be equivalent to 10 million euros. In the present work we studied the state of the art with regard to centrifugal pumps and asynchronous motors and followed three interventions in pumps, having been applied diferente types of application and coatings. Data from performance evaluation was compared: factory, before and after maintenance intervention. With coated pumps, the benefits after maintenance interventions could be, in a certain operation point, eleven points higher (for example, from 64% to 75%). Factory performances have been overtaken, whatever coating product we consider. At the same time, the evaluation of machine’s condition was carried out before and after the maintenance intervention, in order to fit the methodology into a true maintenance management policy.
In Portugal, the Managing Entities (ME) of the drinking water sector are obliged to communicate annually to the regulator – Regulatory for Water and Waste Services (RWWS) – a set of indicators that reflect their performance in different areas. Specifically, regarding energy management of drinking water in pumping stations, there is a global indicator (AA16ab), which is intended to reflect the good practices of ME. The calculations made, indicate that in Portugal 100 GWh of electricity should be wasted annually in the water pumping stations, which should be equivalent to 10 million euros. In the present work we studied the state of the art with regard to centrifugal pumps and asynchronous motors and followed three interventions in pumps, having been applied diferente types of application and coatings. Data from performance evaluation was compared: factory, before and after maintenance intervention. With coated pumps, the benefits after maintenance interventions could be, in a certain operation point, eleven points higher (for example, from 64% to 75%). Factory performances have been overtaken, whatever coating product we consider. At the same time, the evaluation of machine’s condition was carried out before and after the maintenance intervention, in order to fit the methodology into a true maintenance management policy.
Description
Dissertação para obtenção do grau de Mestre em Engenharia Mecânica
Keywords
Grupo eletrobomba Impulsor Manutenção Fiabilidade Rendimento Water pump Impeller Maintenance Reliability
Citation
Fernandes, Miguel Vasco Quintas- Processos de revamping de grupos eletrobomba de água potável. Lisboa: Instituto Superior de Engenharia de Lisboa, 2023. Dissertação de Mestrado