{"id":14354,"date":"2024-11-15T09:27:33","date_gmt":"2024-11-15T09:27:33","guid":{"rendered":"https:\/\/hydraflu.com\/?p=14354"},"modified":"2025-06-16T03:32:22","modified_gmt":"2025-06-16T03:32:22","slug":"how-to-prevent-dry-running-pumps","status":"publish","type":"post","link":"https:\/\/hydraflu.com\/pt\/como-evitar-que-as-bombas-funcionem-a-seco\/","title":{"rendered":"Como prevenir o funcionamento a seco das bombas e seus problemas"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-14355\" src=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Gear-Pumps.jpg\" alt=\"Bombas de engrenagem\" width=\"1032\" height=\"688\" srcset=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Gear-Pumps.jpg 1032w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Gear-Pumps-768x512.jpg 768w\" sizes=\"auto, (max-width: 1032px) 100vw, 1032px\" \/><\/p>\n<h2>Introdu\u00e7\u00e3o<\/h2>\n<p>O funcionamento a seco de bombas ou qualquer m\u00e1quina hidr\u00e1ulica \u00e9 extremamente prejudicial ao equipamento e o custo do reparo pode chegar a centenas de d\u00f3lares. Na maioria das vezes, o desgaste natural s\u00f3 permite a substitui\u00e7\u00e3o da bomba, caso esta tenha sido danificada pelo funcionamento a seco. Em resumo, o funcionamento a seco ocorre quando a bomba opera sem o fluido necess\u00e1rio para lubrifica\u00e7\u00e3o e refrigera\u00e7\u00e3o. Isso leva ao superaquecimento, desgaste dos componentes e, por fim, \u00e0 falha da bomba. As causas podem ser n\u00edveis insuficientes de fluido, obstru\u00e7\u00f5es, cavita\u00e7\u00e3o da bomba e outros fatores que ser\u00e3o abordados mais adiante.<\/p>\n<h2>Por que o funcionamento a seco das bombas \u00e9 um problema s\u00e9rio?<\/h2>\n<p>O funcionamento a seco de bombas \u00e9 um problema s\u00e9rio, pois causa danos excessivos n\u00e3o apenas \u00e0s bombas, mas a todo o sistema que elas suportam. Lubrificantes e fluidos n\u00e3o s\u00f3 tornam o funcionamento sem atrito, como tamb\u00e9m dissipam o calor das bombas. Assim, quando a bomba funciona a seco, as perdas por atrito, o desgaste das veda\u00e7\u00f5es, rolamentos e pe\u00e7as m\u00f3veis aumentam, o que eleva a gera\u00e7\u00e3o de calor e danifica as veda\u00e7\u00f5es e juntas. Devido a tudo isso, as bombas falham.<\/p>\n<p><img data-dominant-color=\"87766b\" data-has-transparency=\"false\" style=\"--dominant-color: #87766b;\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-16095 not-transparent\" src=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/rs_w_3070_m.jpg\" alt=\"bomba de engrenagem de funcionamento a seco\" width=\"1600\" height=\"1066\" srcset=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/rs_w_3070_m.jpg 1600w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/rs_w_3070_m-768x512.jpg 768w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/rs_w_3070_m-1536x1023.jpg 1536w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/rs_w_3070_m-18x12.jpg 18w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/p>\n<h2>Quais s\u00e3o as causas do funcionamento a seco em sistemas hidr\u00e1ulicos?<\/h2>\n<p>Existem dezenas de causas para o funcionamento a seco das bombas:<\/p>\n<ol>\n<li>Prepara\u00e7\u00e3o inadequada antes da inicializa\u00e7\u00e3o<\/li>\n<li>Problemas de arrastamento de ar ou cavita\u00e7\u00e3o<\/li>\n<li>Vazamentos na linha de suc\u00e7\u00e3o ou v\u00e1lvulas defeituosas.<\/li>\n<li>Erro do operador durante a manuten\u00e7\u00e3o ou o comissionamento<\/li>\n<li>N\u00edveis baixos de fluido no reservat\u00f3rio<\/li>\n<li>Sensores de n\u00edvel ou alarmes defeituosos<\/li>\n<\/ol>\n<h3>Falta de lubrifica\u00e7\u00e3o<\/h3>\n<p>Todas as m\u00e1quinas rotativas, incluindo bombas (especialmente bombas centr\u00edfugas), dependem do fluido bombeado para lubrificar seus componentes internos, como veda\u00e7\u00f5es e rolamentos. Na aus\u00eancia de fluido lubrificante, o atrito nas bombas aumenta, o que gera calor, e com o calor excessivo al\u00e9m dos par\u00e2metros de projeto, as veda\u00e7\u00f5es das bombas podem queimar ou rachar, o que leva a vazamentos adicionais e falha das bombas.<\/p>\n<h3>Superaquecimento da bomba<\/h3>\n<p>Os \u00f3leos lubrificantes n\u00e3o apenas lubrificam, mas tamb\u00e9m auxiliam na dissipa\u00e7\u00e3o de calor. Sem fluido para absorver e dissipar o calor, os componentes internos da bomba, especialmente o rotor e a carca\u00e7a, podem superaquecer. Isso leva \u00e0 expans\u00e3o t\u00e9rmica e pode causar deforma\u00e7\u00e3o ou empenamento, o que \u00e9 extremamente perigoso e pode danificar permanentemente a carca\u00e7a e o eixo da bomba.<\/p>\n<h3>Danos na veda\u00e7\u00e3o e no impulsor<\/h3>\n<p>As bombas tamb\u00e9m cont\u00eam selos mec\u00e2nicos que s\u00e3o especialmente vulner\u00e1veis em situa\u00e7\u00f5es de funcionamento a seco, pois podem falhar em segundos. Al\u00e9m disso, os rotores podem friccionar contra a carca\u00e7a, causando desgaste ou ranhuras.<\/p>\n<h3>Risco de Cavita\u00e7\u00e3o<\/h3>\n<p>A cavita\u00e7\u00e3o \u00e9 a presen\u00e7a de vapores ou bolhas de ar que colapsam dentro das bombas. Quando a bomba funciona a seco, o ar pode ser aspirado para dentro do sistema, causando cavita\u00e7\u00e3o. Isso provoca danos por corros\u00e3o e vibra\u00e7\u00f5es, o que reduz ainda mais a efici\u00eancia e a vida \u00fatil das bombas.<\/p>\n<h2>Funcionamento a seco moment\u00e2neo versus prolongado de bombas<\/h2>\n<p>A dura\u00e7\u00e3o do funcionamento a seco das bombas est\u00e1 diretamente relacionada \u00e0 gravidade dos problemas que pode causar ao longo do tempo. Existem dois tipos de funcionamento a seco: moment\u00e2neo e prolongado. O funcionamento a seco moment\u00e2neo, com dura\u00e7\u00e3o de apenas alguns segundos, pode causar desgaste m\u00ednimo ou ac\u00famulo de calor, mas geralmente \u00e9 toler\u00e1vel em alguns projetos de bombas, desde que seja pouco frequente. No entanto, o funcionamento a seco prolongado, com dura\u00e7\u00e3o de minutos ou mais, \u00e9 extremamente prejudicial, podendo levar ao superaquecimento, falha da veda\u00e7\u00e3o, cavita\u00e7\u00e3o e potencial queima da bomba.<\/p>\n<p>O funcionamento moment\u00e2neo a seco pode n\u00e3o causar falha imediata, mas incidentes repetidos ou prolongados podem reduzir drasticamente a vida \u00fatil da bomba. O funcionamento a seco prolongado quase sempre resulta em danos significativos e reparos dispendiosos.<\/p>\n<h2>Tipos de bombas afetadas pelo funcionamento a seco<\/h2>\n<p>Diferen\u00e7as na suscetibilidade ao funcionamento a seco com base no projeto e nas necessidades de lubrifica\u00e7\u00e3o:<\/p>\n<table width=\"645\">\n<tbody>\n<tr>\n<td><strong>Tipo de bomba<\/strong><\/td>\n<td><strong>Toler\u00e2ncia ao funcionamento a seco<\/strong><\/td>\n<td><strong>Notas<\/strong><\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/en.wikipedia.org\/wiki\/Gear_pump\">Bomba de engrenagem<\/a><\/td>\n<td>Baixo<\/td>\n<td>Necessita de fluido para lubrifica\u00e7\u00e3o das engrenagens.<\/td>\n<\/tr>\n<tr>\n<td>Bomba de palhetas<\/td>\n<td>Baixo a moderado<\/td>\n<td>As p\u00e1s se desgastam rapidamente sem fluido.<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/en.wikipedia.org\/wiki\/Centrifugal_pump\">Bomba centr\u00edfuga<\/a><\/td>\n<td>Baixo<\/td>\n<td>As veda\u00e7\u00f5es e os impulsores sobreaquecem facilmente.<\/td>\n<\/tr>\n<tr>\n<td>Bomba de diafragma<\/td>\n<td>Alto<\/td>\n<td>Pode funcionar a seco sem sofrer danos.<\/td>\n<\/tr>\n<tr>\n<td>Bomba perist\u00e1ltica<\/td>\n<td>Muito alto<\/td>\n<td>Ideal para situa\u00e7\u00f5es de ensaio geral.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Efeitos e consequ\u00eancias do funcionamento a seco das bombas<\/h2>\n<p>Os efeitos e consequ\u00eancias do funcionamento a seco das bombas podem custar muito mais em reparos e, \u00e0s vezes, na substitui\u00e7\u00e3o completa das bombas. Alguns dos efeitos mais prejudiciais do funcionamento a seco das bombas incluem:<\/p>\n<ol>\n<li>Danos mec\u00e2nicos, como riscos, desgaste ou travamento de componentes internos.<\/li>\n<li>Superaquecimento da bomba devido ao calor gerado pelo atrito causado pela falta de lubrifica\u00e7\u00e3o.<\/li>\n<li>Falhas em veda\u00e7\u00f5es, arruelas e rolamentos devido ao aquecimento e vibra\u00e7\u00f5es.<\/li>\n<li>Diminui\u00e7\u00e3o da efici\u00eancia ou falha total da bomba<\/li>\n<li>Contamina\u00e7\u00e3o do fluido hidr\u00e1ulico por componentes degradados dentro das bombas e detritos.<\/li>\n<\/ol>\n<h2>Detec\u00e7\u00e3o e sinais de alerta de funcionamento a seco de bombas<\/h2>\n<p>O funcionamento a seco das bombas pode ser detectado atrav\u00e9s de v\u00e1rios sinais de alerta que indicam condi\u00e7\u00f5es operacionais anormais.<\/p>\n<ol>\n<li>Um dos indicadores mais comuns \u00e9 o ru\u00eddo incomum, como guinchos, zumbidos ou rangidos, causado pelo contato metal com metal devido \u00e0 falta de lubrifica\u00e7\u00e3o com fluido.<\/li>\n<li>Outro sinal \u00e9 a ocorr\u00eancia de quedas de press\u00e3o ou leituras de press\u00e3o err\u00e1ticas, \u00e0 medida que a bomba perde a capacidade de manter o fluxo adequado. Isso indica uma poss\u00edvel perda de suc\u00e7\u00e3o.<\/li>\n<li>Al\u00e9m disso, o aumento da temperatura na carca\u00e7a da bomba \u00e9 um sinal cr\u00edtico, geralmente resultante de atrito e falta de refrigera\u00e7\u00e3o do fluido.<\/li>\n<li>Os operadores tamb\u00e9m podem notar vibra\u00e7\u00e3o excessiva, que pode ser causada por desequil\u00edbrio de componentes internos ou cavita\u00e7\u00e3o.<\/li>\n<\/ol>\n<p>Com o tempo, essas condi\u00e7\u00f5es levam ao desgaste r\u00e1pido de veda\u00e7\u00f5es, rolamentos e outras pe\u00e7as m\u00f3veis, o que destaca a import\u00e2ncia da detec\u00e7\u00e3o precoce e da a\u00e7\u00e3o corretiva imediata.<\/p>\n<h2>Estrat\u00e9gias de preven\u00e7\u00e3o<\/h2>\n<p>O funcionamento a seco pode ser evitado atrav\u00e9s de diversas estrat\u00e9gias importantes:<\/p>\n<ol>\n<li>O primeiro passo inclui procedimentos de inicializa\u00e7\u00e3o adequados, como a prepara\u00e7\u00e3o do motor e a purga do ar.<\/li>\n<li>Em seguida, vem a instala\u00e7\u00e3o de sensores de prote\u00e7\u00e3o contra funcionamento a seco, que ajudar\u00e3o voc\u00ea a saber quando sua bomba est\u00e1 secando, para que voc\u00ea possa adicionar \u00f3leo ou fluido e evitar o funcionamento a seco.<\/li>\n<li>O terceiro ponto \u00e9 realizar verifica\u00e7\u00f5es regulares de manuten\u00e7\u00e3o nos n\u00edveis de fluido e na integridade da linha de suc\u00e7\u00e3o. Se voc\u00ea tiver sensores, poder\u00e1 analisar os dados coletados por eles e tomar medidas imediatas.<\/li>\n<li>Al\u00e9m disso, a implementa\u00e7\u00e3o de alarmes e intertravamentos automatizados para desligar a bomba durante condi\u00e7\u00f5es anormais tamb\u00e9m pode ajudar a prevenir os graves danos causados pelo funcionamento a seco das bombas.<\/li>\n<\/ol>\n<h2><img data-dominant-color=\"adcad7\" data-has-transparency=\"false\" style=\"--dominant-color: #adcad7;\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-16098 not-transparent\" src=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Hydraulic-Pump.png\" alt=\"evitar que a bomba funcione a seco\" width=\"1280\" height=\"720\" srcset=\"https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Hydraulic-Pump.png 1280w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Hydraulic-Pump-768x432.png 768w, https:\/\/hydraflu.com\/wp-content\/uploads\/2024\/11\/Hydraulic-Pump-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/>Exemplo pr\u00e1tico de funcionamento a seco de uma bomba<\/h2>\n<p>Vamos entender isso com um exemplo real. Uma grande sider\u00fargica depende de bombas hidr\u00e1ulicas para operar sua m\u00e1quina de lingotamento cont\u00ednuo. Se uma das bombas principais, respons\u00e1vel por circular o fluido hidr\u00e1ulico para o oscilador do molde, secar e isso passar despercebido, todo o processo de lingotamento ser\u00e1 paralisado. Isso provavelmente resultar\u00e1 em horas de paradas n\u00e3o planejadas para manuten\u00e7\u00e3o e perda de produ\u00e7\u00e3o.<strong> uma enorme quantidade de dinheiro e horas de trabalho.<\/strong><\/p>\n<p>A produ\u00e7\u00e3o pode ser interrompida por mais de 36 horas, causando uma perda financeira significativa estimada em <strong>$150,000<\/strong>, incluindo tempo de inatividade, reparos e substitui\u00e7\u00e3o de fluidos. Mais detalhes ser\u00e3o revelados por uma investiga\u00e7\u00e3o, como se o sensor estava com defeito ou se havia intertravamentos de inicializa\u00e7\u00e3o.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>As bombas s\u00e3o componentes essenciais das opera\u00e7\u00f5es industriais, independentemente da presen\u00e7a de sistemas hidr\u00e1ulicos. Sendo equipamentos rotativos, as bombas precisam ser lubrificadas para minimizar o desgaste por atrito. O funcionamento a seco da bomba \u00e9 a causa mais comum de falhas, frequentemente ignorada ou negligenciada. Essa demora acarreta enormes preju\u00edzos com manuten\u00e7\u00e3o e dificuldades operacionais. Com o conhecimento adequado sobre lubrifica\u00e7\u00e3o e outros m\u00e9todos preventivos, \u00e9 poss\u00edvel evitar falhas nas bombas e manter a efici\u00eancia do sistema.<\/p>\n<p>Para m\u00e1quinas hidr\u00e1ulicas como <a href=\"https:\/\/hydraflu.com\/pt\/bomba-hidraulica\/\">bombas<\/a>, <a href=\"https:\/\/hydraflu.com\/pt\/bloco-do-coletor-hidraulico\/\">blocos de manifold hidr\u00e1ulicos<\/a>, <a href=\"https:\/\/hydraflu.com\/pt\/unidade-hidraulica\/mini-unidade-hidraulica\/\">unidades hidr\u00e1ulicas<\/a> e <a href=\"https:\/\/hydraflu.com\/pt\/valvula-hidraulica\/\">v\u00e1lvulas<\/a>, Sinta-se \u00e0 vontade para entrar em contato com <a href=\"https:\/\/hydraflu.com\/pt\/contate-nos\/\">Hydraflu<\/a> Para um or\u00e7amento e entrega r\u00e1pidos.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction Dry running of pumps or any hydraulic machinery is highly damaging to the equipment and costs hundreds of dollars to get the repair work [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-14354","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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