{"id":2172,"date":"2026-10-15T00:37:34","date_gmt":"2026-10-14T23:37:34","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/engenharia\/espessura-de-parede-do-tubo\/"},"modified":"2026-10-15T00:37:34","modified_gmt":"2026-10-14T23:37:34","slug":"espessura-de-parede-do-tubo","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/engenharia\/espessura-de-parede-do-tubo\/","title":{"rendered":"Espessura de parede do tubo"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Espessura m\u00ednima de parede pela press\u00e3o interna (f\u00f3rmula de Barlow)<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2172\" data-favorite-title=\"Espessura de parede do tubo\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/engenharia\/espessura-de-parede-do-tubo\/\" data-favorite-excerpt=\"Calcule a espessura m\u00ednima de parede necess\u00e1ria para conter com seguran\u00e7a a press\u00e3o interna usando a f\u00f3rmula de Barlow. Informe a press\u00e3o interna, o di\u00e2metro externo, a tens\u00e3o circunferencial admiss\u00edvel e o fator de projeto para obter o resultado em mm e polegadas.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-pipeline\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/engenharia\/espessura-de-parede-do-tubo\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2172\" data-post=\"2172\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Press\u00e3o interna (P)<\/label><div class=\"term\">P<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"presso_interna_p\" id=\"field-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"100\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"bar\" selected>bar<\/option><option value=\"mpa\">MPa<\/option><option value=\"kpa\">kPa<\/option><option value=\"psi\">psi<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Di\u00e2metro externo do tubo (D)<\/label><div class=\"term\">D<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"dimetro_externo_do_tubo_d\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"219.1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"mm\" selected>mm<\/option><option value=\"in\">in<\/option><option value=\"m\">m<\/option><option value=\"ft\">ft<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-3\">A f\u00f3rmula de Barlow usa o di\u00e2metro externo.<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-5\">Tens\u00e3o circunferencial admiss\u00edvel (S)<\/label><div class=\"term\">S<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"tenso_circunferencial_admissvel_s\" id=\"field-5\" aria-describedby=\"calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"359\"\/><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"mpa\" selected>MPa<\/option><option value=\"psi\">psi<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-5\">A\u00e7o X52: SMYS \u2248 359 MPa; a\u00e7o sem costura A106 \u2248 138 MPa.<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-7\">Fator de projeto (F)<\/label><div class=\"term\">F<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"fator_de_projeto_f\" id=\"field-7\" aria-describedby=\"calc-info-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.01\" max=\"1\" value=\"0.72\"\/><small id=\"calc-info-7\">0,72 para gasodutos de transmiss\u00e3o (ASME B31.8); 0,60 para oleodutos (B31.4); 1,0 para n\u00e3o aplicar redu\u00e7\u00e3o.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2172\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Espessura m\u00ednima de parede<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Espessura m\u00ednima de parede<\/span><span class=\"result-term\">t<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"mm\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Espessura m\u00ednima de parede<\/span><span class=\"result-term\">t<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"in\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>Resumo do c\u00e1lculo<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"2172\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula da espessura de parede do tubo<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\nt = \\frac{P \\cdot D}{2 \\cdot S \\cdot F}<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(t\\) \u2014 espessura m\u00ednima de parede exigida<\/li>\n<li>\\(P\\) \u2014 press\u00e3o interna de projeto<\/li>\n<li>\\(D\\) \u2014 di\u00e2metro externo do tubo<\/li>\n<li>\\(S\\) \u2014 tens\u00e3o circunferencial admiss\u00edvel do material do tubo<\/li>\n<li>\\(F\\) \u2014 fator de projeto (de seguran\u00e7a)<\/li>\n<\/ul>\n<p>Esta \u00e9 a f\u00f3rmula de Barlow, a cl\u00e1ssica rela\u00e7\u00e3o de tens\u00e3o circunferencial para paredes finas. Ela estabelece que a for\u00e7a da press\u00e3o que tenta romper o tubo ao longo de seu comprimento deve ser equilibrada pela resist\u00eancia \u00e0 tra\u00e7\u00e3o das duas se\u00e7\u00f5es de parede que suportam essa carga.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Espessura de parede do tubo \u2013 Exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> um gasoduto de transmiss\u00e3o em a\u00e7o X52 (SMYS \u2248 359 MPa), com di\u00e2metro externo de 219,1 mm, opera com press\u00e3o interna de 100 bar (10 MPa). O fator de projeto \u00e9 0,72, conforme a ASME B31.8.<\/p>\n<p>\\[ t = \\frac{P \\cdot D}{2 \\cdot S \\cdot F} = \\frac{10 \\text{ MPa} \\times 219.1 \\text{ mm}}{2 \\times 359 \\text{ MPa} \\times 0.72} = \\frac{2191}{516.96} \\approx 4.24 \\text{ mm} \\]<\/p>\n<p><strong>Resultado:<\/strong> a espessura m\u00ednima te\u00f3rica de parede \u00e9 4,24 mm (0,167 pol). Antes de escolher o schedule do tubo, some as margens para corros\u00e3o, toler\u00e2ncia de fabrica\u00e7\u00e3o e roscas.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora de espessura de parede do tubo<\/h2>\n<ol>\n<li>Informe a <strong>Press\u00e3o interna (P)<\/strong> que o tubo deve conter e selecione sua unidade (bar, MPa, kPa ou psi).<\/li>\n<li>Informe o <strong>Di\u00e2metro externo do tubo (D)<\/strong> com sua unidade (mm, pol, m ou ft). A f\u00f3rmula de Barlow usa o di\u00e2metro externo, n\u00e3o o interno.<\/li>\n<li>Informe a <strong>Tens\u00e3o circunferencial admiss\u00edvel (S)<\/strong> do seu material em MPa ou psi. Para tubos de a\u00e7o, esse valor \u00e9 tipicamente o limite de escoamento m\u00ednimo especificado (SMYS).<\/li>\n<li>Informe o <strong>Fator de projeto (F)<\/strong>: 0,72 para gasodutos de transmiss\u00e3o (ASME B31.8), 0,60 para oleodutos (ASME B31.4), ou 1,0 se voc\u00ea quiser oresultado sem redu\u00e7\u00e3o.<\/li>\n<li>Leia a <strong>espessura m\u00ednima de parede<\/strong> em mm e polegadas, junto com o resumo completo do c\u00e1lculo.<\/li>\n<\/ol>\n<h2>O que \u00e9 o c\u00e1lculo da espessura de parede do tubo?<\/h2>\n<p>Quando um tubo est\u00e1 submetido a press\u00e3o interna, essa press\u00e3o empurra a parede para fora ao longo de toda a circunfer\u00eancia. A tens\u00e3o gerada na parede \u00e9 chamada de <em>tens\u00e3o circunferencial<\/em> (ou hoop stress, em ingl\u00eas), e \u00e9 a tens\u00e3o dominante em um tubo pressurizado \u2014 aproximadamente o dobro da tens\u00e3o longitudinal. Se a tens\u00e3o circunferencial ultrapassar o que o material suporta, o tubo se rompe ao longo de seu comprimento. Por isso, calcular a espessura de parede necess\u00e1ria \u00e9 o primeiro passo em qualquer projeto de tubula\u00e7\u00e3o sob press\u00e3o.<\/p>\n<p>A f\u00f3rmula de Barlow \u00e9 o m\u00e9todo mais simples e mais usado para essa verifica\u00e7\u00e3o. Ela assume que a parede \u00e9 fina em compara\u00e7\u00e3o com o di\u00e2metro, de modo que a tens\u00e3o circunferencial se distribui uniformemente ao longo da espessura. A f\u00f3rmula fornece a espessura m\u00ednima te\u00f3rica na qual a tens\u00e3o circunferencial \u00e9 exatamente igual \u00e0 tens\u00e3o admiss\u00edvel. O fator de projeto \\(F\\) ent\u00e3o reduz essa tens\u00e3o admiss\u00edvel para contemplar a variabilidade do material, a soldagem, a qualidade da constru\u00e7\u00e3o e as consequ\u00eancias de uma falha \u2014 quanto menor o fator de projeto, mais espesso (e mais seguro) fica o tubo resultante.<\/p>\n<p>O resultado desta calculadora \u00e9 a espessura m\u00ednima <em>te\u00f3rica<\/em>, n\u00e3o o tubo que voc\u00ea deve encomendar. Projetos reais precisam somar uma margem para corros\u00e3o (frequentemente 1\u20133 mm), compensar a toler\u00e2ncia de fabrica\u00e7\u00e3o (tipicamente 12,5% da espessura de parede em tubos sem costura) e considerar roscas ou ranhuras. Em seguida, arredonda-se para o schedule padr\u00e3o mais pr\u00f3ximo (STD, XS, SCH 40, SCH 80 etc.). Um resultado de 4,24 mm, por exemplo, normalmente leva \u00e0 escolha de um tubo com parede nominal de pelo menos 6\u20137 mm.<\/p>\n<h2>Premissas e limita\u00e7\u00f5es<\/h2>\n<ul>\n<li><strong>Premissa de parede fina:<\/strong> a f\u00f3rmula de Barlow \u00e9 precisa quando \\(D\/t &gt; 20\\). Em tubos de parede espessa, a tens\u00e3o circunferencial n\u00e3o \u00e9 uniforme na parede e as equa\u00e7\u00f5es de Lam\u00e9 fornecem um resultado mais exato (geralmente mais fino).<\/li>\n<li><strong>Somente press\u00e3o interna est\u00e1tica:<\/strong> a f\u00f3rmula desconsidera carregamentos externos, flex\u00e3o, dilata\u00e7\u00e3o t\u00e9rmica, golpe de ar\u00edete, colapso por v\u00e1cuo e flambagem por press\u00e3o externa.<\/li>\n<li><strong>Sem efici\u00eancia de junta:<\/strong> tubos soldados podem exigir um fator adicional de efici\u00eancia de junta soldada, dependendo da norma e do tipo de solda.<\/li>\n<li><strong>Escolha da tens\u00e3o admiss\u00edvel:<\/strong> para tubos de a\u00e7o, o SMYS \u00e9 uma escolha comum, mas algumas normas exigem uma fra\u00e7\u00e3o dele ou usam outras bases \u2014 confirme sempre com a norma aplic\u00e1vel (ASME B31.1, B31.3, B31.4, B31.8, EN 13480).<\/li>\n<li><strong>Corros\u00e3o e eros\u00e3o:<\/strong> some uma margem sobre o m\u00ednimo calculado; o valor calculado sozinho deixar\u00e1 margem zero ao longo da vida \u00fatil.<\/li>\n<\/ul>\n<h2>Calculadoras relacionadas<\/h2>\n<p>Com a espessura de parede definida, voc\u00ea pode continuar a dimensionar o sistema: estime as perdas por atrito com a calculadora de <a href=\"https:\/\/wpcalc.com\/pt\/engenharia\/perda-de-pressao-em-tubulacao\/\">Perda de press\u00e3o em tubula\u00e7\u00e3o<\/a>, verifique se o regime de escoamento \u00e9 laminar ou turbulento com a calculadora de <a href=\"https:\/\/wpcalc.com\/en\/engineering\/reynolds-number\/\">N\u00famero de Reynolds<\/a> e dimensione o acionamento com a calculadora de <a href=\"https:\/\/wpcalc.com\/en\/engineering\/pump-power\/\">Pot\u00eancia de bombeamento<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calcule a espessura m\u00ednima de parede necess\u00e1ria para conter com seguran\u00e7a a press\u00e3o interna usando a f\u00f3rmula de Barlow. Informe a press\u00e3o interna, o di\u00e2metro externo, a tens\u00e3o circunferencial admiss\u00edvel e o fator de projeto para obter o resultado em mm e polegadas.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6],"tags":[63],"class_list":["post-2172","post","type-post","status-publish","format-standard","hentry","category-engenharia","tag-tubagem"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2172","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2172"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2172\/revisions"}],"predecessor-version":[{"id":2553,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2172\/revisions\/2553"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}