{"id":707,"date":"2018-11-26T22:41:44","date_gmt":"2018-11-26T22:41:44","guid":{"rendered":"https:\/\/blog.infraspeak.com\/?p=707"},"modified":"2026-04-02T18:39:00","modified_gmt":"2026-04-02T18:39:00","slug":"o-que-mtbf","status":"publish","type":"post","link":"https:\/\/blog.infraspeak.com\/pt-pt\/o-que-mtbf\/","title":{"rendered":"O que \u00e9 o MTBF e como calcul\u00e1-lo?"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p><b>MTBF significa Mean Time Between Failures ou Tempo M\u00e9dio Entre em Avarias. <\/b><span style=\"font-weight: 400;\">O MTBF&nbsp; representa o tempo que decorre, em m\u00e9dia, entre duas avarias num mesmo equipamento. Em conjunto com o <\/span><a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/mttr\/\"><span style=\"font-weight: 400;\">MTTR<\/span><\/a><span style=\"font-weight: 400;\">, \u00e9 dos principais indicadores da disponibilidade e confiabilidade de um equipamento. Quanto mais alto for o MTBF, mais fi\u00e1vel \u00e9 a m\u00e1quina em quest\u00e3o.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Neste artigo vamos ver como calcular o MTBF e como \u00e9 decisivo para um plano de manuten\u00e7\u00e3o preventiva. Come\u00e7amos?<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Como calcular o MTBF<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">O c\u00e1lculo do MTBF \u00e9 a divis\u00e3o entre o tempo operacional (total operational time) e o n\u00famero de falhas. O tempo operacional \u00e9 igual \u00e0 diferen\u00e7a entre o tempo total dispon\u00edvel e o tempo perdido. Ent\u00e3o, a f\u00f3rmula do MTBF est\u00e1 representada na seguinte express\u00e3o:<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-2840\" src=\"https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/mtbf_pt-300x41.png\" alt=\"\" width=\"300\" height=\"41\" srcset=\"https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/mtbf_pt-300x41.png 300w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/mtbf_pt-768x105.png 768w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/mtbf_pt-1024x139.png 1024w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/mtbf_pt.png 1366w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Na f\u00f3rmula do MTBF:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">o tempo total dispon\u00edvel corresponde ao n\u00famero de horas em que equipamento teria funcionado se n\u00e3o tivesse falhado;<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">o tempo perdido \u00e9 o tempo total de paragens n\u00e3o planeadas (excluem-se, portanto, paragens planeadas para inspe\u00e7\u00f5es, revis\u00f5es ou substitui\u00e7\u00e3o de pe\u00e7as);<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">o n\u00famero de paragens corresponde ao n\u00famero de falhas.&nbsp;<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">C\u00e1lculo do MTBF \u2013 Exemplo<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Vamos imaginar que um determinado equipamento, que deveria trabalhar 24 horas por dia, tem tr\u00eas paragens. Uma das paragens dura 1 hora, outra 2 horas e uma apenas 30 minutos.<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">tempo total dispon\u00edvel = 24 horas<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">tempo perdido = 3.5 (1+2+0.5).&nbsp;<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u00famero de paragens = 3<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ent\u00e3o, seguindo a f\u00f3rmula do MTBF:<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-2848\" src=\"https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/conta-MTBF-300x94.png\" alt=\"\" width=\"300\" height=\"94\" srcset=\"https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/conta-MTBF-300x94.png 300w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/10\/conta-MTBF.png 465w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Porque \u00e9 que o MTBF \u00e9 importante?&nbsp;<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">O MTBF \u00e9 \u00fatil para estimar a probabilidade de falha, e com que frequ\u00eancia algumas falhas ocorrem. Isto torna-o numa das principais m\u00e9tricas para medir a confiabilidade, embora tamb\u00e9m seja um indicador de disponibilidade.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Apesar de existirem muitos mais <a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/indicadores-de-manutencao\/\">indicadores de manuten\u00e7\u00e3o<\/a> a que deve prestar aten\u00e7\u00e3o, o MTBF \u00e9 uma base para o cronograma de manuten\u00e7\u00e3o preventiva. Al\u00e9m disso, se fizer estimativas corretas com um <a href=\"https:\/\/infraspeak.com\/pt-pt\/solucoes\/software-gestao-stocks\">software gest\u00e3o de stocks<\/a>, tamb\u00e9m melhora o invent\u00e1rio e evita quebras de stock.<\/p>\n<p>O controlo eficaz do MTBF requer um <a href=\"https:\/\/infraspeak.com\/pt-pt\/plataforma\/software-gestao-de-ativos\">software gest\u00e3o de ativos<\/a> robusto que permita monitorizar e analisar o desempenho dos equipamentos de forma cont\u00ednua. S\u00f3 assim \u00e9 poss\u00edvel garantir que os dados utilizados nos c\u00e1lculos s\u00e3o precisos e atualizados.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">No entanto, lembre-se de que um KPI s\u00f3 \u00e9 t\u00e3o exato quanto os dados em que se baseia. Para ter a certeza de que a sua informa\u00e7\u00e3o \u00e9 confi\u00e1vel, escolha o <a href=\"https:\/\/infraspeak.com\/pt-pt\/solucoes\/software-cmms\">software CMMS<\/a> certo. (<a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/cmms\/\">CMMS<\/a>)<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Qual \u00e9 a diferen\u00e7a entre MTBF e MTTR?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Enquanto o MTBF mede a fiabilidade, o MTTR \u00e9 um forte indicador da efic\u00e1cia da repara\u00e7\u00e3o. O MTTR indica quanto tempo demora, em m\u00e9dia, para que um equipamento volte a funcionar depois de uma avaria. Ter um MTTR alto significa que os seus ativos est\u00e3o indispon\u00edveis muito tempo depois de uma avaria.&nbsp;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Por outras palavras, um MTBF alto assegura que um ativo \u00e9 confi\u00e1vel. Manter um MTTR baixo assegura que as paragens duram o m\u00ednimo poss\u00edvel. Juntos, ajudam os facility managers a calcular quanto tempo \u00e9 que um determinado equipamento est\u00e1 dispon\u00edvel.&nbsp;<\/span><\/p>\n<p>Para facility managers, um <a href=\"https:\/\/infraspeak.com\/pt-pt\/solucoes\/software-facility-management\">software gest\u00e3o de facilities<\/a> adequado \u00e9 essencial para calcular e monitorizar o MTBF de forma eficiente. Esta ferramenta permite uma vis\u00e3o integrada de todos os ativos e facilita a tomada de decis\u00f5es estrat\u00e9gicas.<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Como usar o MTTR e o MTBF em conjunto<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Analisar o MTTR e o MTBF em conjunto permite-nos prever a produtividade, planear manuten\u00e7\u00e3o programada, e estimar os custos com manuten\u00e7\u00e3o durante o ano. Estes <\/span><i><span style=\"font-weight: 400;\">insights <\/span><\/i><span style=\"font-weight: 400;\">ajudam os facility managers a perceber quais s\u00e3o os equipamentos vulner\u00e1veis. Isto \u00e9, quais precisam de mais manuten\u00e7\u00e3o, quando, e quais devem ser substitu\u00eddos.&nbsp;<\/span><\/p>\n<p>Um <a href=\"https:\/\/infraspeak.com\/pt-pt\/solucoes\/software-cafm\">software CAFM<\/a> integrado permite uma an\u00e1lise mais precisa dos dados de MTBF e facilita a identifica\u00e7\u00e3o de equipamentos vulner\u00e1veis. Esta an\u00e1lise detalhada \u00e9 fundamental para planear estrat\u00e9gias de manuten\u00e7\u00e3o mais eficazes.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">O objetivo \u00e9 diminuir o n\u00famero de paragens atrav\u00e9s de um estrat\u00e9gia de manuten\u00e7\u00e3o preventiva inteligente. Um MTBF mais elevado dar\u00e1 mais credibilidade e confian\u00e7a \u00e0 sua empresa, tanto a n\u00edvel interno como com os seus clientes. Parab\u00e9ns!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Quanto ao MTTR, o objetivo deve ser diminu\u00ed-lo. Precisa de agir rapidamente \u2014 quanto mais depressa a equipa responder a uma avaria, mais r\u00e1pido se resolver\u00e1. Mas n\u00e3o chega. Por um lado, reduzir o MTTR passa por gest\u00e3o de manuten\u00e7\u00e3o em directo e <\/span><a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/ordem-de-trabalho\/\"><span style=\"font-weight: 400;\">work orders<\/span><\/a><span style=\"font-weight: 400;\"> [em ingl\u00eas] eficazes.&nbsp;<\/span><\/p>\n<p>A implementa\u00e7\u00e3o de um <a href=\"https:\/\/infraspeak.com\/pt-pt\/solucoes\/field-service-management-software\">software field service management<\/a> pode ajudar a reduzir significativamente o tempo de resposta \u00e0s avarias. Uma resposta mais r\u00e1pida e eficaz contribui diretamente para a melhoria do MTTR e, consequentemente, do MTBF.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Por outro lado, precisa de perceber a causa das falhas. Descobrir a <\/span><a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/analise-de-causa-raiz\/\"><span style=\"font-weight: 400;\">causa raiz<\/span><\/a><span style=\"font-weight: 400;\"> de cada avaria \u00e9 a \u00fanica de forma de nunca mais voltar a acontecer. Ou, pelo menos, de diminuir drasticamente a probabilidade de voltar a acontecer. Associar uma rea\u00e7\u00e3o r\u00e1pida \u00e0 an\u00e1lise de causa-raiz previne paragens longas.<\/span><\/p>\n<p>O acompanhamento sistem\u00e1tico do MTBF atrav\u00e9s de um <a href=\"https:\/\/infraspeak.com\/pt-pt\/plataforma\/software-gestao-compliance\">software gest\u00e3o de compliance<\/a> garante o cumprimento das normas de manuten\u00e7\u00e3o preventiva. Esta abordagem estruturada assegura que as boas pr\u00e1ticas s\u00e3o mantidas consistentemente.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Com um MTBF alto e um MTTR baixo, o seu sistema estar\u00e1 a trabalhar \u00e0 sua m\u00e1xima capacidade. Nesse caso, mantenha as boas pr\u00e1ticas e nunca deixe de investir na manuten\u00e7\u00e3o preventiva!<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O MTBF \u00e9 um dos principais indicadores da disponibilidade dos equipamentos. Saiba exatamente o que \u00e9, como o calcular e como se realciona com o MTTR.<\/p>\n","protected":false},"author":54,"featured_media":1657,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":"","_wp_rev_ctl_limit":""},"categories":[371],"tags":[107,164,395],"class_list":["post-707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manutencao","tag-avarias","tag-metrica","tag-mtbf-pt-pt-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>O que \u00e9 o MTBF e como calcul\u00e1-lo? &#8226; Infraspeak Blog<\/title>\n<meta name=\"description\" content=\"O MTBF \u00e9 um dos principais indicadores da disponibilidade dos equipamentos. 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