{"id":10699,"date":"2023-08-21T11:00:20","date_gmt":"2023-08-21T14:00:20","guid":{"rendered":"https:\/\/blog.wika.com\/pt\/\/?p=10699"},"modified":"2025-04-03T14:29:47","modified_gmt":"2025-04-03T17:29:47","slug":"elementos-primarios-de-vazao-placas-de-orificio","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/pt\/geral\/elementos-primarios-de-vazao-placas-de-orificio\/","title":{"rendered":"Elementos prim\u00e1rios de vaz\u00e3o &#8211; Placas de Orif\u00edcio"},"content":{"rendered":"<p><strong>Os <\/strong><a href=\"https:\/\/www.wika.com\/pt-br\/elementos_primarios_de_vazao.WIKA\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\"><strong>\u00a0Elementos Prim\u00e1rios de Vaz\u00e3o<\/strong><\/a><strong> medem a vaz\u00e3o por meio de uma redu\u00e7\u00e3o da press\u00e3o causada por uma restri\u00e7\u00e3o dentro da tubula\u00e7\u00e3o.\u00a0 O fluido que passa por essa restri\u00e7\u00e3o aumenta sua velocidade e simultaneamente reduz sua press\u00e3o. Essa diferen\u00e7a de press\u00e3o nos permite calcular a velocidade do fluido com base no teorema de Bernoulli<\/strong><\/p>\n<h2><strong>O que s\u00e3o placas de orif\u00edcio como elemento prim\u00e1rio de vaz\u00e3o?<\/strong><\/h2>\n<p>A placa de orif\u00edcio \u00e9 um disco com furo conc\u00eantrico, exc\u00eantrico ou segmentado que \u00e9 colocado perpendicularmente \u00e0 tubula\u00e7\u00e3o. O di\u00e2metro externo \u00e9 igual ao espa\u00e7o interno entre os parafusos dos flanges para facilitar a montagem.<\/p>\n<p>A espessura do disco depende do tamanho da tubula\u00e7\u00e3o e da temperatura de opera\u00e7\u00e3o. S\u00e3o os elementos prim\u00e1rios de vaz\u00e3o mais utilizados na ind\u00fastria, pois oferecem uma solu\u00e7\u00e3o econ\u00f4mica e robusta para aplica\u00e7\u00f5es com redu\u00e7\u00e3o de at\u00e9 4:1 e n\u00e3o requerem calibra\u00e7\u00e3o peri\u00f3dica.\u00a0Para instalar uma placa de orif\u00edcio, s\u00e3o utilizados flanges de orif\u00edcio ao inv\u00e9s de flanges convencionais, onde as tomadas de press\u00e3o s\u00e3o usinadas aos pares diretamente no flange, eliminando a necessidade de suportes na placa ou conex\u00f5es na parede da tubula\u00e7\u00e3o.<\/p>\n<h2><strong>Como funcionam as placas de orif\u00edcio?<\/strong><\/h2>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2023\/08\/captura-de-tela-2023-08-01-145333-388x317.png\" \/><p class=\"wp-caption-text\">Funcionamento de uma placa de orif\u00edcio<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p>\u00c0 medida que o fluido passa atrav\u00e9s da placa de orif\u00edcio, sua press\u00e3o diminui at\u00e9 atingir seu m\u00ednimo em uma \u00e1rea chamada \u201cvena contracta&#8221;. Neste ponto, o valor m\u00ednimo de press\u00e3o e a velocidade m\u00e1xima s\u00e3o obtidos.\u00a0\u00a0 Ent\u00e3o a press\u00e3o aumenta novamente, mas n\u00e3o recupera mais seu valor anterior devido \u00e0s perdas causadas por turbul\u00eancias e atritos.\u00a0 A diferen\u00e7a de press\u00e3o causada pela placa de orif\u00edcio \u00e9 usada para calcular a vaz\u00e3o.<\/p>\n<p>A norma ISO 5167-1 estabelece os princ\u00edpios gerais para os m\u00e9todos de medi\u00e7\u00e3o e os requisitos b\u00e1sicos relativos \u00e0s caracter\u00edsticas geom\u00e9tricas, regras de instala\u00e7\u00e3o e opera\u00e7\u00e3o. As placas de orif\u00edcio s\u00e3o ideais para aplica\u00e7\u00f5es nas seguintes condi\u00e7\u00f5es: \u2013 Temperatura m\u00e1xima de servi\u00e7o de at\u00e9 800 \u00b0C &#8211; Press\u00e3o m\u00e1xima de trabalho de at\u00e9 400 bar &#8211; Adequados para medir l\u00edquidos, gases e vapor &#8211; Precis\u00e3o \u00b1 0,5% da vaz\u00e3o efetiva ou m\u00e1xima &#8211; Repetibilidade de medi\u00e7\u00e3o 0,1%<\/p>\n<p><strong>Tipos de placas de orif\u00edcio<\/strong><\/p>\n<p>Existem basicamente quatro vers\u00f5es de placas de orif\u00edcio para diferentes aplica\u00e7\u00f5es.<\/p>\n<p><strong>Placas de orif\u00edcio conc\u00eantricas de bordo reto (vers\u00e3o padr\u00e3o)<\/strong><\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2023\/08\/captura-de-tela-2023-08-01-150216-388x251.png\" \/><p class=\"wp-caption-text\">Esta vers\u00e3o destina-se a aplica\u00e7\u00f5es universais em fluidos e gases limpos.<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p><strong>Placa de orif\u00edcio com bordo quadrante ou entrada c\u00f4nica<\/strong><\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2023\/08\/captura-de-tela-2023-08-01-150608-388x252.png\" \/><p class=\"wp-caption-text\">Placas de orif\u00edcio com bordo quadrante ou entrada c\u00f4nica s\u00e3o a melhor escolha para medi\u00e7\u00e3o de fluidos com baixo n\u00famero de Reynolds.<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p><strong>Placas de orif\u00edcio exc\u00eantricas\u00a0<\/strong><\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2023\/08\/captura-de-tela-2023-08-01-150841-388x248.png\" \/><p class=\"wp-caption-text\">As placas exc\u00eantricas s\u00e3o aplicadas a tubos de pequeno di\u00e2metro.<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p><strong>Placa de orif\u00edcio segmental\u00a0<\/strong><\/p>\n\n      <div class=\"wp-caption aligncenter\" style=\"max-width:396px;\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/pt\/\/files\/2023\/08\/captura-de-tela-2023-08-01-151031-388x251.png\" \/><p class=\"wp-caption-text\">Placas segmentais para medi\u00e7\u00e3o em meios bif\u00e1sicos, sujos e contendo part\u00edculas.<\/p><\/div>\n    \n<p>&nbsp;<\/p>\n<p>Outro sistema de medi\u00e7\u00e3o de vaz\u00e3o s\u00e3o os<a href=\"https:\/\/www.wika.com\/pt-br\/flc_apt_e_flc_apt_f.WIKA?highlightedText=pitot\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\"> Tubos de Pitot <\/a>que consistem em dois tubos que detectam a press\u00e3o nos dois pontos extremos da tubula\u00e7\u00e3o. Outro elemento prim\u00e1rio de vaz\u00e3o \u00e9 o \u00a0<a href=\"https:\/\/www.wika.com\/pt-br\/flc_ro_ms_flc_ro_st.WIKA?highlightedText=orif%C3%ADcio\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">orif\u00edcio de restri\u00e7\u00e3o<\/a>, utilizado para atingir uma redu\u00e7\u00e3o da press\u00e3o a um n\u00edvel desejado. Outra solu\u00e7\u00e3o consiste no <a href=\"https:\/\/www.wika.com\/pt-br\/flc_vt_bar_flc_vt_ws.WIKA?highlightedText=venturi\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">Tubo Venturi<\/a>, que \u00e9 um trecho convergente gradual para uma passagem estreita, por onde o fluido passa com velocidade acelerada, seguido de uma se\u00e7\u00e3o difusora. \u00a0<\/p>\n<p>N\u00e3o hesite em <a href=\"https:\/\/www.wika.com\/pt-br\/contato.WIKA\" target=\"_blank\" rel=\"noopener external nofollow\" class=\"ext-link\" onclick=\"this.target=&#039;_blank&#039;;\">nos contatar<\/a> para obter mais informa\u00e7\u00e3o sobre as <a href=\"https:\/\/www.wika.es\/products_primary_flow_elements_es_es.WIKA?Node=71215&amp;346=867\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">placas de orif\u00edcio<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os \u00a0Elementos Prim\u00e1rios de Vaz\u00e3o medem a vaz\u00e3o por meio de uma redu\u00e7\u00e3o da press\u00e3o causada por uma restri\u00e7\u00e3o dentro da tubula\u00e7\u00e3o.\u00a0 O fluido que passa por essa restri\u00e7\u00e3o aumenta sua velocidade e simultaneamente reduz sua press\u00e3o. Essa diferen\u00e7a de press\u00e3o nos permite calcular a velocidade do fluido com base no teorema de Bernoulli O [&hellip;]<\/p>\n","protected":false},"author":277,"featured_media":10792,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17,1,13,16,7],"tags":[581,583,582,366],"class_list":["post-10699","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aplicacoes","category-geral","category-know-how","category-produtos","category-produtos-vazao","tag-medio-de-vazo","tag-modelo-flc-op","tag-placas-de-orifcio","tag-vazo"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Elementos prim\u00e1rios de vaz\u00e3o - Placas de Orif\u00edcio - WIKA blog<\/title>\n<meta name=\"description\" content=\"A placa de orif\u00edcio \u00e9 um disco com furo conc\u00eantrico, exc\u00eantrico ou segmentado que \u00e9 colocado perpendicularmente \u00e0 tubula\u00e7\u00e3o.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/pt\/geral\/elementos-primarios-de-vazao-placas-de-orificio\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Elementos prim\u00e1rios de vaz\u00e3o - Placas de Orif\u00edcio - WIKA blog\" \/>\n<meta property=\"og:description\" content=\"A placa de orif\u00edcio \u00e9 um disco com furo conc\u00eantrico, exc\u00eantrico ou segmentado que \u00e9 colocado perpendicularmente \u00e0 tubula\u00e7\u00e3o.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wika.com\/pt\/geral\/elementos-primarios-de-vazao-placas-de-orificio\/\" \/>\n<meta property=\"og:site_name\" content=\"WIKA blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/WIKA.BR\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wika.com\/pt\/files\/2023\/08\/placa-de-orificio-700x471-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"471\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Gabriel Rodrigues\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gabriel Rodrigues\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.wika.com\/pt\/geral\/elementos-primarios-de-vazao-placas-de-orificio\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/pt\/geral\/elementos-primarios-de-vazao-placas-de-orificio\/\"},\"author\":{\"name\":\"Gabriel Rodrigues\",\"@id\":\"https:\/\/blog.wika.com\/pt\/#\/schema\/person\/b5fb5c28071607a209d6c24992cf791c\"},\"headline\":\"Elementos prim\u00e1rios de vaz\u00e3o &#8211; 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