{"id":266861,"date":"2026-08-28T09:27:00","date_gmt":"2026-08-28T12:27:00","guid":{"rendered":"https:\/\/www.em.com.br\/emalta\/?p=266861"},"modified":"2026-08-25T18:51:39","modified_gmt":"2026-08-25T21:51:39","slug":"o-que-significa-a-marcacao-pn-20-ou-pn-25-impressa-nos-canos-e-conexoes-hidraulicas","status":"publish","type":"post","link":"https:\/\/www.em.com.br\/emalta\/2026\/08\/28\/o-que-significa-a-marcacao-pn-20-ou-pn-25-impressa-nos-canos-e-conexoes-hidraulicas\/","title":{"rendered":"O que significa a marca\u00e7\u00e3o PN 20 ou PN 25 impressa nos canos e conex\u00f5es hidr\u00e1ulicas?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Em canos e conex\u00f5es, a marca <strong>PN 20 ou PN 25<\/strong> parece um c\u00f3digo de tamanho, mas est\u00e1 ligada \u00e0 press\u00e3o nominal do componente. Os n\u00fameros servem para classificar o sistema e precisam ser lidos junto com material, temperatura e norma, porque a press\u00e3o segura de trabalho pode mudar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por que PN n\u00e3o \u00e9 o mesmo que o di\u00e2metro do cano?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 f\u00e1cil confundir as marca\u00e7\u00f5es porque um tubo pode trazer v\u00e1rias siglas lado a lado. PN fala de press\u00e3o nominal. O tamanho ou di\u00e2metro possui outra identifica\u00e7\u00e3o e n\u00e3o deve ser deduzido a partir do n\u00famero que aparece depois de PN.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong><a href=\"https:\/\/www.iso.org\/standard\/13925.html?browse=ics\" target=\"_blank\" rel=\"noopener noreferrer\">defini\u00e7\u00e3o internacional de press\u00e3o nominal<\/a><\/strong> descreve PN como uma designa\u00e7\u00e3o num\u00e9rica arredondada usada como refer\u00eancia. Ela ajuda a classificar componentes e a manter compatibilidade dentro de uma fam\u00edlia de tubula\u00e7\u00f5es.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-1024x576.jpg\" alt=\"\" class=\"wp-image-266893\" srcset=\"https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-1024x576.jpg 1024w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-300x169.jpg 300w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-768x432.jpg 768w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-750x422.jpg 750w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23-1140x641.jpg 1140w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap23.jpg 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">O n\u00famero ajuda a diferenciar pe\u00e7as projetadas para condi\u00e7\u00f5es de press\u00e3o distintas<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">O que os n\u00fameros 20 e 25 indicam?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nas classes de tubula\u00e7\u00e3o expressas dessa forma, PN 20 e PN 25 representam n\u00edveis nominais diferentes de press\u00e3o. Em sistemas cuja classifica\u00e7\u00e3o \u00e9 dada em bar, 20 bar equivalem a <strong>2,0 MPa<\/strong> e 25 bar a <strong>2,5 MPa<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As quatro ideias principais s\u00e3o:<\/p>\n\n\n\n<style>\r\n.card-list{box-sizing:border-box;display:flex;flex-direction:column;gap:14px;width:100%;max-width:680px;margin:16px auto;font-family:'Segoe UI',Arial,sans-serif;}\r\n.card-list .item{box-sizing:border-box;display:grid;grid-template-columns:52px 1fr;gap:14px;align-items:start;background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:16px;box-shadow:0 8px 22px rgba(0,0,0,.06);}\r\n.card-list .num{width:42px;height:42px;border-radius:14px;background:#2c3e50;color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:800;line-height:1;}\r\n.card-list .txt{display:flex;flex-direction:column;gap:4px;}\r\n.card-list .title{font-size:15px;font-weight:700;color:#1a1a1a;line-height:1.35;}\r\n.card-list .desc{font-size:13px;color:#6b6b6b;line-height:1.5;}\r\n@media(max-width:480px){\r\n  .card-list{gap:12px;margin:14px auto;}\r\n  .card-list .item{grid-template-columns:1fr;padding:14px;border-radius:16px;}\r\n  .card-list .num{width:38px;height:38px;border-radius:12px;font-size:14px;}\r\n}\r\n<\/style>\r\n<div class=\"google-auto-ads-ignore card-list\">\r\n  <div class=\"item\">\r\n    <div class=\"num\">1<\/div>\r\n    <div class=\"txt\">\r\n      <span class=\"title\">PN significa press\u00e3o nominal<\/span>\r\n      <span class=\"desc\">A sigla classifica o componente dentro de uma s\u00e9rie definida pela norma aplic\u00e1vel.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n  <div class=\"item\">\r\n    <div class=\"num\">2<\/div>\r\n    <div class=\"txt\">\r\n      <span class=\"title\">PN 20 \u00e9 uma classe menor<\/span>\r\n      <span class=\"desc\">Em uma s\u00e9rie expressa em bar, a refer\u00eancia num\u00e9rica corresponde a 20 bar.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n  <div class=\"item\">\r\n    <div class=\"num\">3<\/div>\r\n    <div class=\"txt\">\r\n      <span class=\"title\">PN 25 \u00e9 uma classe maior<\/span>\r\n      <span class=\"desc\">Na mesma l\u00f3gica, a refer\u00eancia sobe para 25 bar.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n  <div class=\"item\">\r\n    <div class=\"num\">4<\/div>\r\n    <div class=\"txt\">\r\n      <span class=\"title\">A temperatura continua importando<\/span>\r\n      <span class=\"desc\">A press\u00e3o permitida em servi\u00e7o pode cair quando as condi\u00e7\u00f5es ficam diferentes das usadas no projeto.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Leia tamb\u00e9m: <a href=\"https:\/\/www.em.com.br\/emalta\/2026\/08\/25\/o-que-significam-a-letra-e-cortada-por-uma-faixa-ou-por-duas-faixas-vermelhas-nas-placas-de-transito\/\" target=\"_blank\" rel=\"noreferrer noopener\">O que significam a letra E cortada por uma faixa ou por duas faixas vermelhas nas placas de tr\u00e2nsito?<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por que a press\u00e3o de trabalho pode ser menor que o n\u00famero marcado?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Um componente n\u00e3o trabalha sozinho. Material, temperatura do fluido e regras de projeto alteram o limite permitido. Normas de tubos pl\u00e1sticos, por exemplo, trabalham com temperaturas de refer\u00eancia e podem exigir redu\u00e7\u00e3o d<strong>Leia tamb\u00e9m: <a href=\"https:\/\/www.em.com.br\/emalta\/2026\/08\/25\/o-que-significam-a-letra-e-cortada-por-uma-faixa-ou-por-duas-faixas-vermelhas-nas-placas-de-transito\/\" target=\"_blank\" rel=\"noreferrer noopener\">O que significam a letra E cortada por uma faixa ou por duas faixas vermelhas nas placas de tr\u00e2nsito?<\/a><\/strong>a press\u00e3o quando a temperatura sobe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de usar o n\u00famero como limite, \u00e9 preciso conferir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>O material do tubo e da conex\u00e3o.<\/li>\n\n\n\n<li>A temperatura prevista para o fluido.<\/li>\n\n\n\n<li>A norma usada na fabrica\u00e7\u00e3o.<\/li>\n\n\n\n<li>A classe de todos os componentes ligados ao sistema.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong><a href=\"https:\/\/www.iso.org\/standard\/65253.html\" target=\"_blank\" rel=\"noopener noreferrer\">normaliza\u00e7\u00e3o de tubos termopl\u00e1sticos<\/a><\/strong> separa di\u00e2metros, classes de press\u00e3o e resist\u00eancia m\u00ednima exigida. Por isso, a marca PN funciona como refer\u00eancia t\u00e9cnica, n\u00e3o como autoriza\u00e7\u00e3o para ignorar as demais condi\u00e7\u00f5es do projeto.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-1024x576.jpg\" alt=\"\" class=\"wp-image-266894\" srcset=\"https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-1024x576.jpg 1024w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-300x169.jpg 300w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-768x432.jpg 768w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-750x422.jpg 750w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1-1140x641.jpg 1140w, https:\/\/www.em.com.br\/emalta\/wp-content\/uploads\/2026\/08\/cap1234-1.jpg 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Temperatura e material tamb\u00e9m podem influenciar a press\u00e3o suportada na instala\u00e7\u00e3o<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Como PN 20 e PN 25 se comparam?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Se dois componentes pertencem \u00e0 mesma fam\u00edlia t\u00e9cnica e seguem as mesmas condi\u00e7\u00f5es de refer\u00eancia, o PN maior representa uma classe de press\u00e3o nominal maior. Isso n\u00e3o permite misturar pe\u00e7as sem conferir se elas foram projetadas para trabalhar juntas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A compara\u00e7\u00e3o direta fica assim:<\/p>\n\n\n\n<style>\r\n.premium-tbl{\r\n  box-sizing:border-box;\r\n  display:flex;\r\n  flex-direction:column;\r\n  width:100%;\r\n  max-width:720px;\r\n  margin:16px auto;\r\n  border:1px solid #e2e5e9;\r\n  border-radius:18px;\r\n  overflow:hidden;\r\n  background:#ffffff;\r\n  box-shadow:0 8px 24px rgba(0,0,0,.07);\r\n  font-family:Arial,'Segoe UI',sans-serif!important;\r\n  color:#1a1a1a!important;\r\n}\r\n.premium-tbl table{\r\n  display:table!important;\r\n  box-sizing:border-box;\r\n  width:100%!important;\r\n  max-width:none!important;\r\n  margin:0!important;\r\n  padding:0!important;\r\n  border:0!important;\r\n  border-collapse:collapse!important;\r\n  border-spacing:0!important;\r\n  table-layout:fixed!important;\r\n  background:#ffffff!important;\r\n  font-family:Arial,'Segoe UI',sans-serif!important;\r\n}\r\n.premium-tbl thead{display:table-header-group!important;}\r\n.premium-tbl tbody{display:table-row-group!important;}\r\n.premium-tbl tr{display:table-row!important;}\r\n.premium-tbl thead tr{background:#2c3e50!important;}\r\n.premium-tbl th{\r\n  box-sizing:border-box!important;\r\n  padding:14px 16px!important;\r\n  margin:0!important;\r\n  border:0!important;\r\n  background:#2c3e50!important;\r\n  color:#ffffff!important;\r\n  font-family:Arial,'Segoe UI',sans-serif!important;\r\n  font-size:12px!important;\r\n  font-weight:700!important;\r\n  font-style:normal!important;\r\n  line-height:1.4!important;\r\n  letter-spacing:.02em!important;\r\n  text-transform:none!important;\r\n  text-align:left!important;\r\n  vertical-align:middle!important;\r\n  opacity:1!important;\r\n}\r\n.premium-tbl th:nth-child(1){width:25%!important;}\r\n.premium-tbl th:nth-child(2){width:35%!important;}\r\n.premium-tbl th:nth-child(3){width:40%!important;}\r\n.premium-tbl td{\r\n  box-sizing:border-box!important;\r\n  display:table-cell!important;\r\n  padding:14px 16px!important;\r\n  margin:0!important;\r\n  border:0!important;\r\n  border-bottom:1px solid #e5e7eb!important;\r\n  background:transparent!important;\r\n  color:#1a1a1a!important;\r\n  font-family:Arial,'Segoe UI',sans-serif!important;\r\n  font-size:13px!important;\r\n  font-weight:400!important;\r\n  font-style:normal!important;\r\n  line-height:1.5!important;\r\n  text-align:left!important;\r\n  vertical-align:middle!important;\r\n  opacity:1!important;\r\n  overflow-wrap:break-word!important;\r\n  word-break:normal!important;\r\n}\r\n.premium-tbl tbody tr:nth-child(odd){background:#f8f9fa!important;}\r\n.premium-tbl tbody tr:nth-child(even){background:#ffffff!important;}\r\n.premium-tbl tbody tr:hover{background:#f1f4f7!important;}\r\n.premium-tbl tbody tr:last-child td{border-bottom:none!important;}\r\n.premium-tbl .main{display:block!important;color:#111111!important;font-size:13px!important;font-weight:700!important;line-height:1.35!important;opacity:1!important;}\r\n.premium-tbl .sub{display:block!important;margin-top:3px!important;color:#555555!important;font-size:12px!important;line-height:1.35!important;opacity:1!important;}\r\n.premium-tbl .badge{display:inline-flex!important;align-items:center!important;justify-content:center!important;border-radius:999px!important;padding:4px 10px!important;font-size:11px!important;font-weight:700!important;white-space:nowrap!important;opacity:1!important;}\r\n.premium-tbl .ok{background:#dff5eb!important;color:#08694f!important;}\r\n.premium-tbl .neutro{background:#e3effb!important;color:#145b9b!important;}\r\n@media(max-width:640px){\r\n  .premium-tbl{width:100%!important;max-width:100%!important;border:0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important;overflow:visible!important;}\r\n  .premium-tbl table{display:block!important;width:100%!important;background:transparent!important;}\r\n  .premium-tbl thead{display:none!important;}\r\n  .premium-tbl tbody{display:flex!important;flex-direction:column!important;gap:12px!important;width:100%!important;}\r\n  .premium-tbl tr{display:block!important;box-sizing:border-box!important;width:100%!important;background:#ffffff!important;border:1px solid #e2e5e9!important;border-radius:16px!important;box-shadow:0 6px 18px rgba(0,0,0,.06)!important;overflow:hidden!important;}\r\n  .premium-tbl td{display:flex!important;box-sizing:border-box!important;justify-content:space-between!important;align-items:flex-start!important;gap:16px!important;width:100%!important;padding:12px 14px!important;border:0!important;border-bottom:1px solid #e8eaed!important;background:#ffffff!important;color:#1a1a1a!important;font-size:13px!important;text-align:right!important;}\r\n  .premium-tbl td:last-child{border-bottom:none!important;}\r\n  .premium-tbl td::before{content:attr(data-label)!important;flex:0 0 110px!important;color:#555555!important;font-size:11px!important;font-weight:700!important;line-height:1.4!important;text-align:left!important;opacity:1!important;}\r\n  .premium-tbl .main,.premium-tbl .sub{text-align:right!important;}\r\n}\r\n<\/style>\r\n<div class=\"google-auto-ads-ignore premium-tbl\">\r\n  <table>\r\n    <thead>\r\n      <tr>\r\n        <th>Marca\u00e7\u00e3o<\/th>\r\n        <th>Refer\u00eancia<\/th>\r\n        <th>Convers\u00e3o comum<\/th>\r\n      <\/tr>\r\n    <\/thead>\r\n    <tbody>\r\n      <tr>\r\n        <td data-label=\"Marca\u00e7\u00e3o\"><span class=\"main\">PN 20<\/span><\/td>\r\n        <td data-label=\"Refer\u00eancia\">Classe nominal 20<\/td>\r\n        <td data-label=\"Convers\u00e3o comum\"><span class=\"badge neutro\">20 bar, 2,0 MPa<\/span><\/td>\r\n      <\/tr>\r\n      <tr>\r\n        <td data-label=\"Marca\u00e7\u00e3o\"><span class=\"main\">PN 25<\/span><\/td>\r\n        <td data-label=\"Refer\u00eancia\">Classe nominal 25<\/td>\r\n        <td data-label=\"Convers\u00e3o comum\"><span class=\"badge ok\">25 bar, 2,5 MPa<\/span><\/td>\r\n      <\/tr>\r\n    <\/tbody>\r\n  <\/table>\r\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">O que conferir antes de instalar uma pe\u00e7a marcada com PN?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O ponto mais seguro \u00e9 comparar a marca\u00e7\u00e3o do componente com a ficha t\u00e9cnica e a norma daquela linha. A <strong><a href=\"https:\/\/www.iso.org\/standard\/82300.html\" target=\"_blank\" rel=\"noopener noreferrer\">rela\u00e7\u00e3o entre press\u00e3o e temperatura de refer\u00eancia<\/a><\/strong> aparece em normas de sistemas pressurizados porque o limite pode mudar com a temperatura.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Assim, PN 25 indica uma classe nominal superior a PN 20 dentro do mesmo sistema, mas o n\u00famero n\u00e3o substitui o projeto hidr\u00e1ulico. Tubos, conex\u00f5es, v\u00e1lvulas e juntas precisam suportar as condi\u00e7\u00f5es reais previstas para a instala\u00e7\u00e3o.<\/p>\n\n\n\n<style>\r\n.curio-box{box-sizing:border-box;display:flex;flex-direction:column;gap:6px;width:100%;max-width:680px;margin:20px auto 4px;background:#f5f7fa;border:1px solid #e5e7eb;border-radius:16px;padding:16px 18px;box-shadow:0 6px 18px rgba(0,0,0,.05);font-family:'Segoe UI',Arial,sans-serif;}\r\n.curio-box .tag{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#2c3e50;}\r\n.curio-box .txt{font-size:13px;color:#333;line-height:1.6;}\r\n<\/style>\r\n<div class=\"google-auto-ads-ignore curio-box\">\r\n  <span class=\"tag\">\ud83d\udca1 Curiosidade<\/span>\r\n  <span class=\"txt\">Na defini\u00e7\u00e3o da ISO, PN \u00e9 uma designa\u00e7\u00e3o num\u00e9rica arredondada criada para refer\u00eancia t\u00e9cnica e compatibilidade entre componentes.<\/span>\r\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Em canos e conex\u00f5es, a marca PN 20 ou PN 25 parece um c\u00f3digo de tamanho, mas est\u00e1 ligada \u00e0 press\u00e3o nominal do componente. Os n\u00fameros servem para classificar o sistema e precisam ser lidos junto com material, temperatura e norma, porque a press\u00e3o segura de trabalho pode mudar. Por que PN n\u00e3o \u00e9 o [&hellip;]<\/p>\n","protected":false},"author":30,"featured_media":266892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jnews-multi-image_gallery":[],"jnews_single_post":{"format":"standard"},"jnews_primary_category":[],"jnews_social_meta":[],"jnews_override_counter":[],"footnotes":""},"categories":[29],"tags":[867,30114,36437,36436],"class_list":["post-266861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-entretenimento","tag-conexoes","tag-hidraulica","tag-pressao-nominal","tag-tubos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>O que significa a marca\u00e7\u00e3o PN 20 ou PN 25 impressa nos canos e conex\u00f5es hidr\u00e1ulicas? - Estado de Minas - Em Alta<\/title>\n<meta name=\"description\" content=\"As marca\u00e7\u00f5es PN 20 e PN 25 resumem uma classe de press\u00e3o, mas a leitura correta depende do material, da temperatura e da norma do sistema.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.em.com.br\/emalta\/2026\/08\/28\/o-que-significa-a-marcacao-pn-20-ou-pn-25-impressa-nos-canos-e-conexoes-hidraulicas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que significa a marca\u00e7\u00e3o PN 20 ou PN 25 impressa nos canos e conex\u00f5es hidr\u00e1ulicas? 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