{"id":56799,"date":"2026-09-11T08:27:04","date_gmt":"2026-09-11T08:27:04","guid":{"rendered":"https:\/\/zobai.com\/?p=56799"},"modified":"2026-09-11T10:13:08","modified_gmt":"2026-09-11T10:13:08","slug":"how-to-read-a-certified-capacity-curve-and-nameplate","status":"publish","type":"post","link":"https:\/\/zobai.com\/pt\/blog\/how-to-read-a-certified-capacity-curve-and-nameplate\/","title":{"rendered":"Como ler uma curva de capacidade certificada e a placa de identifica\u00e7\u00e3o"},"content":{"rendered":"<style> .zobai-capacity-guide { max-width: 100%; overflow-wrap: anywhere; } .zobai-capacity-guide .table-scroll { width: 100%; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1.25rem 0; } .zobai-capacity-guide .table-scroll table { width: 100%; min-width: 680px; border-collapse: collapse; } .zobai-capacity-guide .table-scroll th, .zobai-capacity-guide .table-scroll td { padding: 0.7rem 0.8rem; text-align: left; vertical-align: top; } .zobai-capacity-guide .table-scroll caption { text-align: left; font-weight: 600; margin-bottom: 0.65rem; } .zobai-capacity-guide .review-state { margin: 1rem 0; } .zobai-capacity-guide .engineering-cta { margin-top: 2rem; } @media (max-width: 640px) { .zobai-capacity-guide .table-scroll table { font-size: 0.92rem; } .zobai-capacity-guide .table-scroll th, .zobai-capacity-guide .table-scroll td { padding: 0.6rem; } } <\/style>\n<article class=\"zobai-capacity-guide\">\n<p>Uma placa de identifica\u00e7\u00e3o de v\u00e1lvula de seguran\u00e7a e um registro de capacidade certificada devem ser lidos em conjunto, n\u00e3o como duas informa\u00e7\u00f5es n\u00e3o relacionadas. A placa de identifica\u00e7\u00e3o ajuda a estabelecer qual v\u00e1lvula e configura\u00e7\u00e3o voc\u00ea est\u00e1 analisando; o registro de capacidade informa qual evid\u00eancia de capacidade se aplica a um projeto e base de classifica\u00e7\u00e3o definidos de dispositivo de al\u00edvio de press\u00e3o.<\/p>\n<p>O erro comum \u00e9 encontrar um modelo familiar, press\u00e3o de ajuste ou n\u00famero de capacidade e come\u00e7ar a comparar valores imediatamente. Um n\u00famero tecnicamente correto ainda pode ser a evid\u00eancia errada se pertencer a outro tipo de v\u00e1lvula, configura\u00e7\u00e3o, meio certificado ou condi\u00e7\u00e3o de classifica\u00e7\u00e3o.<\/p>\n<p>Uma revis\u00e3o melhor segue uma cadeia de evid\u00eancias: <strong>v\u00e1lvula f\u00edsica \u2192 placa de identifica\u00e7\u00e3o e rastreabilidade \u2192 projeto\/configura\u00e7\u00e3o \u2192 registro de capacidade certificada \u2192 base de classifica\u00e7\u00e3o aplic\u00e1vel.<\/strong><\/p>\n<p>\u201cRegistro de capacidade certificada\u201d \u00e9 deliberadamente mais amplo que \u201ccurva de capacidade\u201d. Dependendo da fonte e do m\u00e9todo de certifica\u00e7\u00e3o, as informa\u00e7\u00f5es de capacidade podem ser apresentadas como um valor, tabela, listagem, fator de vaz\u00e3o, coeficiente ou curva. O <a href=\"https:\/\/www.nationalboard.org\/SiteDocuments\/NB18\/Foreward.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">material explicativo do National Board NB-18<\/a>, por exemplo, reconhece v\u00e1rios m\u00e9todos de estabelecer valores de capacidade certificada, em vez de exigir uma \u00fanica curva tra\u00e7ada universal.<\/p>\n<p>Este guia, portanto, concentra-se em como interpretar e conciliar os documentos. Ele n\u00e3o substitui o c\u00e1lculo de carga de al\u00edvio, o processo completo de dimensionamento da v\u00e1lvula ou a revis\u00e3o do sistema instalado.<\/p>\n<section>\n<h2>Combine a v\u00e1lvula com o documento antes de ler a capacidade<\/h2>\n<p>Antes de ler a capacidade, estabele\u00e7a que as informa\u00e7\u00f5es de capacidade realmente pertencem \u00e0 v\u00e1lvula em an\u00e1lise.<\/p>\n<p>Comece pelos identificadores dispon\u00edveis na v\u00e1lvula f\u00edsica, na placa de identifica\u00e7\u00e3o e nos documentos de suporte. Dependendo do fabricante e da rota de certifica\u00e7\u00e3o, informa\u00e7\u00f5es \u00fateis de correspond\u00eancia podem incluir o fabricante, modelo ou tipo de projeto, tamanho de entrada e sa\u00edda, press\u00e3o de ajuste, informa\u00e7\u00f5es de s\u00e9rie ou tag, designador de certifica\u00e7\u00e3o e dados de configura\u00e7\u00e3o relacionados \u00e0 capacidade.<\/p>\n<p>Esses identificadores n\u00e3o desempenham todos a mesma fun\u00e7\u00e3o.<\/p>\n<p>Para registros do National Board, o <strong>n\u00famero de certifica\u00e7\u00e3o de capacidade \u00e9 atribu\u00eddo ao tipo de v\u00e1lvula<\/strong>. N\u00e3o deve ser confundido com um n\u00famero de s\u00e9rie do fabricante usado para rastrear uma v\u00e1lvula f\u00edsica individual. O NB-18 tamb\u00e9m registra o nome comercial do tipo de projeto do fabricante e o designador do c\u00f3digo de constru\u00e7\u00e3o aplic\u00e1vel.<\/p>\n<p>Durante a substitui\u00e7\u00e3o ou revis\u00e3o de documentos, uma fam\u00edlia de modelos pode identificar o projeto geral, mas uma configura\u00e7\u00e3o relevante para a capacidade ainda precisa ser verificada quando aplic\u00e1vel. <a href=\"https:\/\/www.nationalboard.org\/SiteDocuments\/PRD\/NB-500.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">National Board NB-500<\/a> requer revis\u00e3o quando modifica\u00e7\u00f5es de projeto afetam o caminho de fluxo, a abertura ou as caracter\u00edsticas de desempenho do dispositivo de al\u00edvio de press\u00e3o.<\/p>\n<ol>\n<li>Identifique a v\u00e1lvula f\u00edsica a partir da placa de identifica\u00e7\u00e3o e das etiquetas dispon\u00edveis.<\/li>\n<li>Compare as informa\u00e7\u00f5es do fabricante e de projeto\/modelo com a documenta\u00e7\u00e3o de suporte.<\/li>\n<li>Verifique o tamanho e qualquer informa\u00e7\u00e3o de configura\u00e7\u00e3o relevante para a capacidade.<\/li>\n<li>Confirme o contexto aplic\u00e1vel de certifica\u00e7\u00e3o ou designador.<\/li>\n<li>Somente ent\u00e3o use as informa\u00e7\u00f5es de capacidade para compara\u00e7\u00e3o.<\/li>\n<\/ol>\n<p>O objetivo \u00e9 simples: <strong>n\u00e3o realize um c\u00e1lculo preciso de capacidade nem uma compara\u00e7\u00e3o com a documenta\u00e7\u00e3o para a v\u00e1lvula errada.<\/strong><\/p>\n<\/section>\n<section>\n<h2>Leia a placa de identifica\u00e7\u00e3o pelo que cada campo comprova<\/h2>\n<p>N\u00e3o h\u00e1 benef\u00edcio em memorizar o layout da placa de identifica\u00e7\u00e3o de um fabricante e presumir que toda v\u00e1lvula de seguran\u00e7a ser\u00e1 igual. Leia a placa de identifica\u00e7\u00e3o da v\u00e1lvula de seguran\u00e7a pela <strong>fun\u00e7\u00e3o de evid\u00eancia<\/strong> das informa\u00e7\u00f5es.<\/p>\n<figure class=\"wp-block-image size-full zobai-figure\" data-image-slot=\"IMG-03\"><img loading=\"lazy\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03.webp\" alt=\"Placa de identifica\u00e7\u00e3o de v\u00e1lvula de seguran\u00e7a anotada, mostrando quais marca\u00e7\u00f5es identificam a v\u00e1lvula, a base de press\u00e3o, os dados relacionados \u00e0 capacidade e o contexto de certifica\u00e7\u00e3o.\" title=\"How to Read a Certified Capacity Curve and Nameplate - IMG-03\" width=\"1200\" height=\"900\" class=\"wp-image-56847\" decoding=\"async\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03.webp 1200w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03-300x225.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03-1024x768.webp 1024w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03-768x576.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03-16x12.webp 16w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-03-400x300.webp 400w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Placa de identifica\u00e7\u00e3o de v\u00e1lvula de seguran\u00e7a anotada, mostrando quais marca\u00e7\u00f5es identificam a v\u00e1lvula, a base de press\u00e3o, os dados relacionados \u00e0 capacidade e o contexto de certifica\u00e7\u00e3o.<\/figcaption><\/figure>\n<div class=\"table-scroll\" role=\"region\" aria-label=\"Safety valve nameplate evidence functions\" tabindex=\"0\">\n<table>\n<caption>Como interpretar as informa\u00e7\u00f5es da placa de identifica\u00e7\u00e3o pela fun\u00e7\u00e3o de evid\u00eancia<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Fun\u00e7\u00e3o de evid\u00eancia<\/th>\n<th scope=\"col\">Informa\u00e7\u00f5es que voc\u00ea pode encontrar<\/th>\n<th scope=\"col\">O que ajuda a estabelecer<\/th>\n<th scope=\"col\">O que n\u00e3o \u00e9 estabelecido por si s\u00f3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Identidade e rastreabilidade<\/strong><\/td>\n<td>Fabricante, modelo\/projeto, n\u00famero de s\u00e9rie ou informa\u00e7\u00f5es de identifica\u00e7\u00e3o (tag), quando fornecidos<\/td>\n<td>Qual v\u00e1lvula f\u00edsica ou modelo est\u00e1 sendo analisado<\/td>\n<td>Capacidade certificada ou adequa\u00e7\u00e3o \u00e0 aplica\u00e7\u00e3o<\/td>\n<\/tr>\n<tr>\n<td><strong>Informa\u00e7\u00f5es de press\u00e3o<\/strong><\/td>\n<td>Press\u00e3o de ajuste, unidade de press\u00e3o e outros dados relacionados \u00e0 press\u00e3o, quando aplic\u00e1vel<\/td>\n<td>Identifica\u00e7\u00e3o e contexto de classifica\u00e7\u00e3o de press\u00e3o<\/td>\n<td>A base completa de capacidade<\/td>\n<\/tr>\n<tr>\n<td><strong>Informa\u00e7\u00f5es de vaz\u00e3o e capacidade<\/strong><\/td>\n<td>Informa\u00e7\u00f5es de capacidade, \u00e1rea de fluxo, coeficiente ou orif\u00edcio, quando aplic\u00e1vel<\/td>\n<td>Caracter\u00edsticas de capacidade do modelo<\/td>\n<td>A carga de al\u00edvio requerida do sistema protegido<\/td>\n<\/tr>\n<tr>\n<td><strong>Informa\u00e7\u00f5es de certifica\u00e7\u00e3o<\/strong><\/td>\n<td>Designa\u00e7\u00e3o do c\u00f3digo aplic\u00e1vel, marca\u00e7\u00e3o ASME ou marca\u00e7\u00e3o do National Board<\/td>\n<td>Contexto e escopo da certifica\u00e7\u00e3o<\/td>\n<td>Aceita\u00e7\u00e3o autom\u00e1tica do projeto<\/td>\n<\/tr>\n<tr>\n<td><strong>Contexto de configura\u00e7\u00e3o ou servi\u00e7o<\/strong><\/td>\n<td>Informa\u00e7\u00f5es de temperatura ou de configura\u00e7\u00e3o espec\u00edfica do fabricante, quando presentes<\/td>\n<td>Evid\u00eancias adicionais para compatibilizar a v\u00e1lvula com a documenta\u00e7\u00e3o<\/td>\n<td>Adequa\u00e7\u00e3o completa ao processo ou ao sistema instalado<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Esta abordagem \u201ccampo \u2192 fun\u00e7\u00e3o da evid\u00eancia \u2192 limite\u201d \u00e9 mais \u00fatil do que um gloss\u00e1rio de campos, porque um campo v\u00e1lido ainda pode ser solicitado a comprovar algo para o qual nunca foi previsto.<\/p>\n<p>Por exemplo, o tamanho da conex\u00e3o de entrada ou de sa\u00edda ajuda a identificar a interface de tubula\u00e7\u00e3o. Ele n\u00e3o substitui a evid\u00eancia de capacidade de al\u00edvio. Para a distin\u00e7\u00e3o mais aprofundada entre tamanho nominal da conex\u00e3o, geometria interna de fluxo e capacidade, consulte <a href=\"https:\/\/zobai.com\/pt\/blog\/certified-relieving-capacity-vs-connection-size\/\">Capacidade de al\u00edvio certificada vs. tamanho da conex\u00e3o<\/a>.<\/p>\n<p>Para dispositivos com marca do National Board, a NB-500 acrescenta uma regra mais restrita: quando uma organiza\u00e7\u00e3o aplica a <strong>marca NB<\/strong>, o valor de capacidade de al\u00edvio ou de resist\u00eancia ao fluxo marcado no dispositivo de al\u00edvio de press\u00e3o ou na placa de identifica\u00e7\u00e3o anexada deve ser o valor certificado pelo National Board. O dispositivo marcado tamb\u00e9m deve ser de um tipo certificado pelo National Board dentro do escopo de autoriza\u00e7\u00e3o aplic\u00e1vel.<\/p>\n<p>Isso \u00e9 uma forte evid\u00eancia de capacidade dentro desse framework de certifica\u00e7\u00e3o. Ainda assim, n\u00e3o transforma todos os outros campos da placa de identifica\u00e7\u00e3o em um requisito universal, e n\u00e3o estabelece a adequa\u00e7\u00e3o completa da v\u00e1lvula para um sistema de processo espec\u00edfico.<\/p>\n<\/section>\n<section>\n<h2>Leia uma Curva ou Tabela de Capacidade Certificada a Partir de Sua Base, N\u00e3o Apenas o N\u00famero<\/h2>\n<p>Um n\u00famero de capacidade certificada nunca deve ser separado da base sob a qual foi estabelecido.<\/p>\n<p>O National Board NB-18 ilustra isso claramente. Seus registros de certifica\u00e7\u00e3o podem associar um valor quantitativo de capacidade a unidades, meio de teste, meio certificado, tamanho de entrada\/sa\u00edda, \u00e1rea de fluxo, di\u00e2metro do orif\u00edcio, abertura m\u00ednima, faixas v\u00e1lidas de press\u00e3o de ajuste e designadores de c\u00f3digo. O NB-18 tamb\u00e9m reconhece diferentes m\u00e9todos para estabelecer valores certificados, incluindo capacidade direta, m\u00e9todos de fator de fluxo ou inclina\u00e7\u00e3o, e m\u00e9todos baseados em coeficientes.<\/p>\n<figure class=\"wp-block-image size-full zobai-figure\" data-image-slot=\"IMG-01\"><img loading=\"lazy\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01.webp\" alt=\"Registro de capacidade certificada anotado mostrando o valor de classifica\u00e7\u00e3o juntamente com meio, faixa de press\u00e3o, geometria de fluxo e condi\u00e7\u00f5es de aplicabilidade.\" title=\"How to Read a Certified Capacity Curve and Nameplate - IMG-01\" width=\"1200\" height=\"900\" class=\"wp-image-56845\" decoding=\"async\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01.webp 1200w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01-300x225.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01-1024x768.webp 1024w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01-768x576.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01-16x12.webp 16w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-01-400x300.webp 400w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Registro de capacidade certificada anotado mostrando o valor de classifica\u00e7\u00e3o juntamente com meio, faixa de press\u00e3o, geometria de fluxo e condi\u00e7\u00f5es de aplicabilidade.<\/figcaption><\/figure>\n<ol>\n<li>\n    <strong>Identifique o que o n\u00famero representa.<\/strong><br \/>\n    Determine se o documento fornece uma capacidade de fluxo direta, coeficiente, fator de fluxo ou outro valor de classifica\u00e7\u00e3o. N\u00e3o presuma que dois n\u00fameros rotulados como \u201ccapacidade\u201d foram estabelecidos pelo mesmo m\u00e9todo.\n  <\/li>\n<li>\n    <strong>Verifique a unidade antes de comparar valores.<\/strong><br \/>\n    Um n\u00famero de capacidade sem sua unidade e base n\u00e3o est\u00e1 pronto para compara\u00e7\u00e3o. Valores de fluxo m\u00e1ssico e fluxo volum\u00e9trico n\u00e3o devem ser tratados como intercambi\u00e1veis apenas porque ambos s\u00e3o grandezas de fluxo.\n  <\/li>\n<li>\n    <strong>Identifique o meio certificado.<\/strong><br \/>\n    O NB-18 distingue o <strong>meio de teste<\/strong> utilizado durante os testes de certifica\u00e7\u00e3o inicial a partir do <strong>meio certificado<\/strong> coberto pelo registro de certifica\u00e7\u00e3o.\n  <\/li>\n<li>\n    <strong>Verifique o tamanho e a geometria de fluxo associados ao registro.<\/strong><br \/>\n    Tamanho da conex\u00e3o, \u00e1rea de fluxo e di\u00e2metro do orif\u00edcio s\u00e3o informa\u00e7\u00f5es distintas. O NB-18 registra esses dados de forma independente e tamb\u00e9m identifica a abertura m\u00ednima para v\u00e1lvulas de al\u00edvio de press\u00e3o.\n  <\/li>\n<li>\n    <strong>Confirme se a press\u00e3o de ajuste est\u00e1 dentro do registro aplic\u00e1vel.<\/strong><br \/>\n    O NB-18 associa press\u00f5es de ajuste m\u00ednimas e m\u00e1ximas ao tamanho, designador e meio certificado. Uma press\u00e3o de ajuste estampada \u00e9, portanto, um ponto de correspond\u00eancia \u00fatil, mas n\u00e3o define por si s\u00f3 toda a base de capacidade.\n  <\/li>\n<li>\n    <strong>Leia as limita\u00e7\u00f5es antes de usar o valor.<\/strong><br \/>\n    O NB-18 afirma especificamente que seus valores de classifica\u00e7\u00e3o listados foram estabelecidos sob condi\u00e7\u00f5es de descarga atmosf\u00e9rica e adverte que as capacidades calculadas podem n\u00e3o permanecer aplic\u00e1veis onde existe contrapress\u00e3o de descarga. Tamb\u00e9m afirma que as capacidades s\u00e3o certificadas apenas para as condi\u00e7\u00f5es sob as quais foram obtidas.\n  <\/li>\n<\/ol>\n<p>Essa limita\u00e7\u00e3o do NB-18 n\u00e3o deve ser generalizada em uma afirma\u00e7\u00e3o de que todo documento de capacidade de cada sistema de certifica\u00e7\u00e3o tem exatamente o mesmo limite. Ela demonstra o princ\u00edpio de engenharia mais amplo: <strong>uma capacidade certificada \u00e9 evid\u00eancia vinculada \u00e0s condi\u00e7\u00f5es, n\u00e3o um n\u00famero de fluxo universal.<\/strong><\/p>\n<p>Somente ap\u00f3s a identidade da v\u00e1lvula, o m\u00e9todo de classifica\u00e7\u00e3o, a unidade, o meio certificado, o tamanho\/configura\u00e7\u00e3o aplic\u00e1vel, a faixa de press\u00e3o e as limita\u00e7\u00f5es relevantes estarem alinhados \u00e9 que o valor deve ser comparado com o requisito de engenharia.<\/p>\n<p>Se a tarefa ainda for determinar as <strong>capacidade de al\u00edvio requerida<\/strong>, condi\u00e7\u00f5es de al\u00edvio ou orif\u00edcio requerido, use o separado <a href=\"https:\/\/zobai.com\/pt\/blog\/safety-valve-sizing-and-certified-relieving-capacity-guide\/\">Guia de dimensionamento e capacidade de al\u00edvio certificada de v\u00e1lvulas de seguran\u00e7a<\/a>. Esse c\u00e1lculo pertence a uma etapa de engenharia diferente.<\/p>\n<\/section>\n<section>\n<h2>Verifique o registro de capacidade em rela\u00e7\u00e3o \u00e0 v\u00e1lvula f\u00edsica<\/h2>\n<p>Entender a placa de identifica\u00e7\u00e3o e entender o registro de capacidade n\u00e3o \u00e9 suficiente se voc\u00ea nunca os reconectar.<\/p>\n<p>A pr\u00f3xima tarefa \u00e9 verificar se a v\u00e1lvula f\u00edsica e as evid\u00eancias de capacidade descrevem o mesmo projeto relevante para a capacidade.<\/p>\n<figure class=\"wp-block-image size-full zobai-figure\" data-image-slot=\"IMG-02\"><img loading=\"lazy\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02.webp\" alt=\"Cadeia de evid\u00eancias que liga a v\u00e1lvula de seguran\u00e7a f\u00edsica e a placa de identifica\u00e7\u00e3o ao projeto certificado, registro de capacidade e base de classifica\u00e7\u00e3o aplic\u00e1vel.\" title=\"How to Read a Certified Capacity Curve and Nameplate - IMG-02\" width=\"1200\" height=\"900\" class=\"wp-image-56846\" decoding=\"async\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02.webp 1200w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02-300x225.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02-1024x768.webp 1024w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02-768x576.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02-16x12.webp 16w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/certified-capacity-curve-nameplate-img-02-400x300.webp 400w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Cadeia de evid\u00eancias que liga a v\u00e1lvula de seguran\u00e7a f\u00edsica e a placa de identifica\u00e7\u00e3o ao projeto certificado, registro de capacidade e base de classifica\u00e7\u00e3o aplic\u00e1vel.<\/figcaption><\/figure>\n<div class=\"table-scroll\" role=\"region\" aria-label=\"Cross-check safety valve and capacity record\" tabindex=\"0\">\n<table>\n<caption>Verifica\u00e7\u00e3o cruzada da v\u00e1lvula f\u00edsica em rela\u00e7\u00e3o \u00e0s evid\u00eancias de capacidade certificada<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Verifica\u00e7\u00e3o cruzada<\/th>\n<th scope=\"col\">Lado da v\u00e1lvula f\u00edsica \/ placa de identifica\u00e7\u00e3o<\/th>\n<th scope=\"col\">Lado da capacidade certificada<\/th>\n<th scope=\"col\">Pergunta a responder<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Fabricante<\/strong><\/td>\n<td>Identifica\u00e7\u00e3o do fabricante<\/td>\n<td>Informa\u00e7\u00f5es do fabricante\/montador certificado<\/td>\n<td>Voc\u00ea est\u00e1 analisando evid\u00eancias da fonte correta?<\/td>\n<\/tr>\n<tr>\n<td><strong>Design<\/strong><\/td>\n<td>Modelo, estilo ou outra identidade de projeto<\/td>\n<td>Tipo de projeto certificado<\/td>\n<td>O registro pertence a este projeto?<\/td>\n<\/tr>\n<tr>\n<td><strong>Tamanho<\/strong><\/td>\n<td>Tamanho de entrada\/sa\u00edda marcado, quando dispon\u00edvel<\/td>\n<td>Tamanho ou faixa aplic\u00e1vel listada<\/td>\n<td>O registro certificado \u00e9 para este tamanho?<\/td>\n<\/tr>\n<tr>\n<td><strong>Geometria de fluxo<\/strong><\/td>\n<td>Orif\u00edcio, \u00e1rea de fluxo ou dados relacionados, quando dispon\u00edveis<\/td>\n<td>Dados de \u00e1rea de fluxo\/orif\u00edcio certificados<\/td>\n<td>As evid\u00eancias de capacidade descrevem a mesma configura\u00e7\u00e3o de fluxo?<\/td>\n<\/tr>\n<tr>\n<td><strong>Press\u00e3o<\/strong><\/td>\n<td>Press\u00e3o de ajuste estampada<\/td>\n<td>Faixa de press\u00e3o de ajuste certificada aplic\u00e1vel<\/td>\n<td>Esta v\u00e1lvula est\u00e1 dentro da faixa de classifica\u00e7\u00e3o?<\/td>\n<\/tr>\n<tr>\n<td><strong>Fluido<\/strong><\/td>\n<td>Pode ser estabelecida em documenta\u00e7\u00e3o de suporte em vez de na placa<\/td>\n<td>Meio certificado<\/td>\n<td>A base de capacidade \u00e9 relevante para o servi\u00e7o sendo comparado?<\/td>\n<\/tr>\n<tr>\n<td><strong>Certifica\u00e7\u00e3o<\/strong><\/td>\n<td>Marca ou designador quando aplic\u00e1vel<\/td>\n<td>Listagem de certifica\u00e7\u00e3o e designador<\/td>\n<td>O contexto da certifica\u00e7\u00e3o est\u00e1 alinhado?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Nem toda placa de identifica\u00e7\u00e3o de v\u00e1lvula conter\u00e1 todos os campos desta tabela. O objetivo n\u00e3o \u00e9 exigir um conjunto id\u00eantico de marca\u00e7\u00f5es de cada fabricante. O objetivo \u00e9 obter informa\u00e7\u00f5es de correspond\u00eancia independentes suficientes para estabelecer que o registro de capacidade se aplica ao projeto que est\u00e1 realmente diante de voc\u00ea.<\/p>\n<p>A certifica\u00e7\u00e3o de capacidade est\u00e1 vinculada a projetos de dispositivos de al\u00edvio de press\u00e3o. A NB-500 estabelece que altera\u00e7\u00f5es que afetam o caminho de fluxo, a abertura ou o desempenho exigem revis\u00e3o, enquanto <a href=\"https:\/\/www.nationalboard.org\/SiteDocuments\/PRD\/NB-501.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">National Board NB-501<\/a> describes design review, initial certification testing and production certification testing as parts of the certification process.<\/p>\n<p>In practice, keep the evidence chain traceable: <strong>physical valve \u2192 identifying information \u2192 certified design\/configuration \u2192 capacity record \u2192 rating conditions.<\/strong><\/p>\n<p>Do not collapse that chain into \u201cthe model looks right.\u201d<\/p>\n<p>There is also an important historical-data limitation. The current NB-18 database does not list organizations that no longer hold certification or device-design certifications no longer in production. For an older installed valve, <strong>no current NB-18 result is not proof that the valve type was never historically certified<\/strong>. Historical verification may require a different path through the National Board.<\/p>\n<\/section>\n<section>\n<h2>Know What Certification Evidence Proves\u2014and What It Does Not<\/h2>\n<p>Certification evidence becomes most useful when its scope is kept intact.<\/p>\n<p>ASME&#8217;s current pressure-relief-device conformity-assessment framework uses BPVC Section XIII for pressure-relief-device certification requirements, while other applicable BPVC Sections can remain relevant to particular certification scopes. For example, ASME&#8217;s current <a href=\"https:\/\/www.asme.org\/certification-accreditation\/asme-certification-process\/required-code-books\" target=\"_blank\" rel=\"noopener noreferrer\">Required Code Books guidance<\/a> identifies both Section VIII Division 1 and Section XIII within the UV certification requirements. The correct interpretation therefore depends on the applicable designator, certification route and project code basis rather than on a simplified \u201cold section versus new section\u201d rule.<\/p>\n<p>The National Board program adds a related but distinct layer. NB-500 requires a pressure-relief device bearing the NB mark to be a National Board-certified type, while NB-501 describes design review, initial certification testing and production certification testing as parts of the program.<\/p>\n<div class=\"table-scroll\" role=\"region\" aria-label=\"Certification evidence scope\" tabindex=\"0\">\n<table>\n<caption>What certification evidence supports\u2014and what still requires project engineering<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Certification evidence can support<\/th>\n<th scope=\"col\">Certification evidence does not establish by itself<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A defined pressure-relief-device design or type has been certified within the applicable program<\/td>\n<td>A carga de al\u00edvio requerida do sistema protegido<\/td>\n<\/tr>\n<tr>\n<td>Capacity or flow-resistance evidence has been established under that certification framework<\/td>\n<td>That a specific project calculation is correct<\/td>\n<\/tr>\n<tr>\n<td>The applicable certification\/designator context<\/td>\n<td>That the installed inlet and outlet piping are acceptable<\/td>\n<\/tr>\n<tr>\n<td>Authorized marking within the defined scope<\/td>\n<td>Material compatibility with every possible process medium<\/td>\n<\/tr>\n<tr>\n<td>A traceable basis for reviewing the device rating<\/td>\n<td>Acceptance by every owner, jurisdiction or project specification<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The National Board cautions against interpreting its records too broadly: NB-18 states that it has not tested each production device and that installation, operating conditions and manufacturer recommendations still need to be considered when selecting a pressure-relief device for service.<\/p>\n<p>The practical boundary is not <strong>certification mark \u2192 valve automatically approved for the project<\/strong>. It is <strong>certification evidence \u2192 one verified part of the project&#8217;s overall technical evidence<\/strong>.<\/p>\n<p>The same distinction works in the other direction. Missing or inconsistent documentation does not automatically prove that a valve is physically defective, unsafe or noncompliant. It means the evidence available to the reviewer is insufficient for the conclusion being attempted.<\/p>\n<p>For a broader explanation of certification and standards roles, see the <a href=\"https:\/\/zobai.com\/pt\/blog\/safety-valve-standards-guide\/\">Guia de Normas para V\u00e1lvulas de Seguran\u00e7a<\/a>.<\/p>\n<p>For current ASME conformity-assessment scope information, refer to the <a href=\"https:\/\/www.asme.org\/getmedia\/f0fb9562-b703-4621-93e1-e270a7fa2a4d\/CA-1_2025.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ASME conformity-assessment requirements<\/a>.<\/p>\n<\/section>\n<section>\n<h2>Stop the Review When the Evidence Does Not Match<\/h2>\n<p>A good nameplate review does not have to end with \u201capproved\u201d or \u201crejected.\u201d Often the correct result is simply: <strong>the current evidence is not sufficient yet.<\/strong><\/p>\n<h3>Mismatches That Require Further Verification<\/h3>\n<div class=\"table-scroll\" role=\"region\" aria-label=\"Safety valve documentation mismatches\" tabindex=\"0\">\n<table>\n<caption>Documentation mismatches and the appropriate next action<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">What you find<\/th>\n<th scope=\"col\">Por que \u00e9 importante<\/th>\n<th scope=\"col\">Appropriate next action<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Physical valve identity cannot be established<\/td>\n<td>You cannot reliably connect the capacity record to the device<\/td>\n<td>Recover readable nameplate\/tag and manufacturer identification<\/td>\n<\/tr>\n<tr>\n<td>Design or capacity-relevant configuration differs<\/td>\n<td>The certified rating may belong to a different design<\/td>\n<td>Obtain the exact configuration and corresponding capacity documentation<\/td>\n<\/tr>\n<tr>\n<td>Certified medium is unclear or different<\/td>\n<td>The capacity basis may not be comparable<\/td>\n<td>Verify the applicable certified medium and rating basis<\/td>\n<\/tr>\n<tr>\n<td>Set pressure is outside or cannot be tied to the applicable range<\/td>\n<td>The record may not cover the valve being reviewed<\/td>\n<td>Obtain the applicable certification or rating record<\/td>\n<\/tr>\n<tr>\n<td>Connection size matches but flow\/orifice evidence does not<\/td>\n<td>Mechanical fit is not capacity equivalence<\/td>\n<td>Confirm exact flow area\/orifice and supported capacity<\/td>\n<\/tr>\n<tr>\n<td>NB-18 atmospheric-discharge capacity is being applied where back pressure matters<\/td>\n<td>The published rating may not apply directly<\/td>\n<td>Obtain the applicable manufacturer or project engineering basis<\/td>\n<\/tr>\n<tr>\n<td>Nameplate capacity conflicts with the certification record<\/td>\n<td>At least one part of the evidence chain is unresolved<\/td>\n<td>Resolve the discrepancy before choosing either value<\/td>\n<\/tr>\n<tr>\n<td>Mark or designator scope is unclear<\/td>\n<td>The meaning of the certification cannot be established<\/td>\n<td>Confirm the applicable certification scope<\/td>\n<\/tr>\n<tr>\n<td>Older valve is absent from today&#8217;s NB-18 database<\/td>\n<td>Current search results do not necessarily show historical certification<\/td>\n<td>Request historical verification instead of assuming non-certification<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The National Board&#8217;s NB-18 limitations support this cautious approach: its listed capacities are condition-specific, the database has current-versus-historical limitations, and installed operating conditions still have to be considered.<\/p>\n<p>Usar <strong>verify before relying<\/strong> here\u2014not automatically \u201cunsafe,\u201d \u201cnoncompliant\u201d or \u201cmust be replaced.\u201d<\/p>\n<h3>What to Request Before the Review Continues<\/h3>\n<p>Do not answer an evidence gap with the vague request \u201cplease send the certificate.\u201d Ask for the document that closes the actual gap.<\/p>\n<p>For an unclear valve identity, request a readable nameplate\/tag record and manufacturer identification. If the certified design is unclear, request the applicable certification listing or manufacturer record. If capacity is the problem, request the capacity table, listing or certificate with its unit, certified medium and relevant rating basis.<\/p>\n<p>If the configuration does not match, obtain documentation identifying the exact certified configuration. If the installed conditions differ from the basis of the capacity record, the missing input is not another nameplate photograph\u2014it is the manufacturer or project engineering evidence that addresses those conditions.<\/p>\n<div class=\"review-state\">\n<p><strong>Continue review:<\/strong> the valve identity, capacity evidence and relevant rating basis align.<\/p>\n<p><strong>Verify further:<\/strong> an important relationship is unresolved but can be closed with additional evidence.<\/p>\n<p><strong>Do not rely on the capacity comparison yet:<\/strong> known information conflicts or the rating basis does not match the condition being evaluated.<\/p>\n<\/div>\n<p>These are practical document-review states used in this guide, <strong>not ASME or National Board regulatory classifications<\/strong>.<\/p>\n<p>For the broader purchasing and document-control process, continue with the <a href=\"https:\/\/zobai.com\/pt\/blog\/safety-valve-procurement-checklist\/\">Lista de Verifica\u00e7\u00e3o para Aquisi\u00e7\u00e3o de V\u00e1lvulas de Seguran\u00e7a<\/a>.<\/p>\n<aside class=\"engineering-cta\" aria-label=\"Engineering review next step\">\n<p><strong>Reviewing a replacement valve or incomplete capacity record?<\/strong><\/p>\n<p>If the nameplate, datasheet, capacity documentation or service basis does not line up, prepare the available valve identification, working medium, set pressure, required capacity and supporting documents before the next technical review.<\/p>\n<p><a href=\"https:\/\/zobai.com\/pt\/ask-an-engineer\/\">Consulte um Engenheiro de V\u00e1lvulas de Seguran\u00e7a<\/a> to continue the documentation and selection discussion.<\/p>\n<\/aside>\n<p>The final decision should still be made against the applicable project code, equipment design basis, service conditions and authorized engineering review\u2014not from a nameplate field in isolation.<\/p>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Aprenda a interpretar os dados da placa de identifica\u00e7\u00e3o da v\u00e1lvula de seguran\u00e7a e os registros de capacidade certificada, conciliar a v\u00e1lvula com a documenta\u00e7\u00e3o e identificar lacunas antes da an\u00e1lise de engenharia.<\/p>","protected":false},"author":2,"featured_media":56845,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-56799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards-certification-procurement"],"_links":{"self":[{"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/posts\/56799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/comments?post=56799"}],"version-history":[{"count":2,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/posts\/56799\/revisions"}],"predecessor-version":[{"id":56887,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/posts\/56799\/revisions\/56887"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/media\/56845"}],"wp:attachment":[{"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/media?parent=56799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/categories?post=56799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zobai.com\/pt\/wp-json\/wp\/v2\/tags?post=56799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}