{"id":30,"count":2,"description":"<!-- wp:heading -->\r\n<h2 id=\"h-valves-in-oxygen-service\">V\u00e1lvulas em servi\u00e7o de oxig\u00eanio<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nO oxig\u00eanio tem propriedades qu\u00edmicas tipicamente ativas. \u00c9 uma subst\u00e2ncia fortemente oxidante e combust\u00edvel e pode combinar-se com a maioria dos elementos para formar \u00f3xidos, exceto ouro, prata e gases inertes, como h\u00e9lio, n\u00e9on, arg\u00f4nio e cript\u00f4nio. Uma explos\u00e3o ocorre quando o oxig\u00eanio \u00e9 misturado com gases combust\u00edveis (acetileno, hidrog\u00eanio, metano, etc.) em uma determinada propor\u00e7\u00e3o ou quando a v\u00e1lvula do tubo encontra um inc\u00eandio repentino. O fluxo de oxig\u00eanio na mudan\u00e7a do sistema de dutos no processo de transporte de g\u00e1s oxig\u00eanio, a European Industrial Gas Association (EIGA) desenvolveu o padr\u00e3o IGC Doc 13\/12E \u201cOxygen Pipeline and Piping Systems\u201d dividiu as condi\u00e7\u00f5es de trabalho do oxig\u00eanio em \u201cimpacto\u201d e \u201c sem impacto\u201d. O \u201cimpacto\u201d \u00e9 uma ocasi\u00e3o perigosa porque \u00e9 f\u00e1cil estimular energia, causando combust\u00e3o e explos\u00e3o. A v\u00e1lvula de oxig\u00eanio \u00e9 a t\u00edpica \u201cocasi\u00e3o de impacto\u201d.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA v\u00e1lvula de oxig\u00eanio \u00e9 um tipo de v\u00e1lvula especial projetada para uma tubula\u00e7\u00e3o de oxig\u00eanio e tem sido amplamente utilizada em metalurgia, petr\u00f3leo, qu\u00edmica e outras ind\u00fastrias que envolvem oxig\u00eanio. O material da v\u00e1lvula de oxig\u00eanio \u00e9 limitado \u00e0 press\u00e3o de trabalho e vaz\u00e3o para evitar a colis\u00e3o de part\u00edculas e impurezas na tubula\u00e7\u00e3o. Portanto, o engenheiro deve considerar totalmente o atrito, a eletricidade est\u00e1tica, a igni\u00e7\u00e3o de n\u00e3o metais, poss\u00edveis poluentes (corros\u00e3o superficial do a\u00e7o carbono) e outros fatores ao selecionar uma v\u00e1lvula de oxig\u00eanio.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Propriedades de oxig\u00eanio<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>A concentra\u00e7\u00e3o normal no ar \u00e9 21%<\/li>\r\n \t<li>Incolor, inodoro e ins\u00edpido.<\/li>\r\n \t<li>N\u00e3o pode ser detectado pelos sentidos humanos<\/li>\r\n \t<li>N\u00e3o \u00e9 inflam\u00e1vel, mas suporta e acelera a combust\u00e3o.<\/li>\r\n \t<li>Materiais inflam\u00e1veis, incluindo alguns materiais que normalmente s\u00e3o relativamente<\/li>\r\n \t<li>N\u00e3o inflam\u00e1vel no ar, queima muito rapidamente em altas concentra\u00e7\u00f5es de oxig\u00eanio.<\/li>\r\n \t<li>Tr\u00eas elementos necess\u00e1rios para um inc\u00eandio de oxig\u00eanio s\u00e3o uma fonte de igni\u00e7\u00e3o, oxig\u00eanio e material inflam\u00e1vel (combust\u00edvel) \u2013 conhecido como \u201ctri\u00e2ngulo do fogo\u201d<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Material usado na v\u00e1lvula de oxig\u00eanio<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOrganic materials have ignition temperatures below those of metals. The use of organic materials in contact with oxygen should be avoided, particularly when the material is directly in the flow stream. When an organic material must be used for parts such as valve seats, diaphragms, or packing, it is preferable to select a material with the highest ignition temperature, the lowest specific heat, and the necessary mechanical properties.\r\nLubricants and sealing compounds should be used only if they are suitable for oxygen service and then used sparingly. Ordinary petroleum lubricants are not satisfactory and are particularly hazardous because of their high heat of combustion and high rate of reaction.\r\nThe approximate ignition temperatures in 138 bar (2000 psig) oxygen for a few organic materials are shown in table 1.\r\nTable 1. Typical Ignition Temperatures\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>MATERIAL<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">TEMPERATURA T\u00cdPICA DE IGNI\u00c7\u00c3O EM 138 BAR (2.000 PSIG) DE OXIG\u00caNIO<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>PTFE e PCTFE<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">468<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>70% PTFE com preenchimento de bronze<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">468<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Fluorelast\u00f4mero<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">316<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Nylon<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">210<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Polietileno<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">182<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Cloropreno e Nitrila<\/td>\r\n<td class=\"has-text-align-center\" data-align=\"center\">149<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\n<strong>Metais<\/strong>\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA sele\u00e7\u00e3o dos metais deve ser baseada na sua resist\u00eancia \u00e0 igni\u00e7\u00e3o e na taxa de rea\u00e7\u00e3o. A seguir est\u00e1 uma compara\u00e7\u00e3o dessas duas propriedades para alguns materiais de v\u00e1lvula comumente usados.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\n<strong>Resist\u00eancia \u00e0 igni\u00e7\u00e3o no oxig\u00eanio<\/strong>\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOs materiais est\u00e3o listados em ordem, do mais dif\u00edcil de inflamar ao mais f\u00e1cil de inflamar.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list {\"ordered\":true} -->\r\n<ol>\r\n \t<li>Cobre, ligas de cobre e ligas de n\u00edquel-cobre \u2013 mais resistentes<\/li>\r\n \t<li>A\u00e7o inoxid\u00e1vel (s\u00e9rie 300)<\/li>\r\n \t<li>A\u00e7o carbono<\/li>\r\n \t<li>Alum\u00ednio \u2013 menos resistente<\/li>\r\n<\/ol>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\n<strong>Taxa de rea\u00e7\u00e3o<\/strong>\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOs materiais s\u00e3o listados em ordem, desde a taxa de combust\u00e3o mais lenta at\u00e9 a taxa de combust\u00e3o mais r\u00e1pida.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list {\"ordered\":true} -->\r\n<ol>\r\n \t<li>Cobre, ligas de cobre e ligas de n\u00edquel-cobre \u2013 normalmente n\u00e3o propagam a combust\u00e3o<\/li>\r\n \t<li>A\u00e7o carbono<\/li>\r\n \t<li>A\u00e7o inoxid\u00e1vel (s\u00e9rie 300)<\/li>\r\n \t<li>Alum\u00ednio \u2013 queima muito rapidamente<\/li>\r\n<\/ol>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nObserve que o a\u00e7o inoxid\u00e1vel, uma vez aceso, queima mais rapidamente que o a\u00e7o carbono. No entanto, os graus austen\u00edticos (s\u00e9rie 300) do a\u00e7o inoxid\u00e1vel s\u00e3o considerados muito melhores que o a\u00e7o carbono devido \u00e0 sua alta resist\u00eancia \u00e0 igni\u00e7\u00e3o.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"https:\/\/zecovalve.com\/pt\/contact\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>OBTER PRE\u00c7O DA V\u00c1LVULA DE OXIG\u00caNIO<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Qu\u00e3o perigoso \u00e9 o oxig\u00eanio<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nO oxig\u00eanio n\u00e3o \u00e9 combust\u00edvel sozinho. No entanto, se houver um evento de combust\u00e3o, o alto teor de oxig\u00eanio significa que os materiais combust\u00edveis queimam muito mais r\u00e1pido. O impacto de part\u00edculas, a r\u00e1pida pressuriza\u00e7\u00e3o ou a compress\u00e3o de materiais podem resultar em aquecimento que pode causar combust\u00e3o. A contamina\u00e7\u00e3o e a energia mec\u00e2nica, como a fric\u00e7\u00e3o, tamb\u00e9m podem causar igni\u00e7\u00e3o e resultar em inc\u00eandios r\u00e1pidos e quentes quando h\u00e1 mais oxig\u00eanio presente. Quanto maior a concentra\u00e7\u00e3o de oxig\u00eanio, maior o risco de combust\u00e3o.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nLarson destacou que, embora certos cuidados devam ser tomados com o oxig\u00eanio l\u00edquido, \u00e9 ainda mais importante estar atento ao trabalhar com ele no estado gasoso.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Minimizando Riscos<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPara minimizar o risco de inc\u00eandio, \u00e9 importante escolher materiais altamente compat\u00edveis para as v\u00e1lvulas \u2013 tanto metais como produtos leves. Tamb\u00e9m \u00e9 importante minimizar os mecanismos de igni\u00e7\u00e3o. Isso pode ser feito minimizando os produtos leves e limitando o uso de lubrificantes. Tamb\u00e9m \u00e9 essencial utilizar as melhores pr\u00e1ticas \u2013 desde o projeto at\u00e9 a fabrica\u00e7\u00e3o, passando pelo envio do produto at\u00e9 o local e pela opera\u00e7\u00e3o.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Como escolher uma v\u00e1lvula usada para oxig\u00eanio?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nAlguns projetos pro\u00edbem explicitamente o uso de v\u00e1lvulas de gaveta em tubula\u00e7\u00f5es de oxig\u00eanio com press\u00e3o de projeto superior a 0,1 mpa. Isso ocorre porque a superf\u00edcie de veda\u00e7\u00e3o das v\u00e1lvulas gaveta ser\u00e1 danificada pelo atrito no movimento relativo (ou seja, a abertura\/fechamento da v\u00e1lvula), o que faz com que pequenas \u201cpart\u00edculas de p\u00f3 de ferro\u201d caiam da superf\u00edcie de veda\u00e7\u00e3o e peguem fogo facilmente. Da mesma forma, a linha de oxig\u00eanio de outro tipo de v\u00e1lvula tamb\u00e9m explodir\u00e1 no momento em que a diferen\u00e7a de press\u00e3o entre os dois lados da v\u00e1lvula for grande e a v\u00e1lvula abrir rapidamente.\r\n\r\n<!-- \/wp:paragraph -->","link":"https:\/\/zecovalve.com\/pt\/tag\/oxygen","name":"oxig\u00eanio","slug":"oxygen","taxonomy":"post_tag","meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Oxygen Ball Valve - Choose Right Oxygen Valve | ZECO Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/pt\/tag\/oxygen\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oxygen Ball Valve - Choose Right Oxygen Valve | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"Valves in Oxygen Service  Oxygen has typically active chemical properties. It is a strong oxidizing and combustible substance and can combine with most elements to form oxides except for gold, silver, and inert gases such as helium, neon, argon, and krypton. An explosion occurs when oxygen is mixed with combustible gases (acetylene, hydrogen, methane, etc.) in a certain proportion or when the pipe valve meets a sudden fire. The oxygen flow in the pipeline system change in the process of oxygen gas transportation, the European Industrial Gas Association (EIGA) developed the standard IGC Doc 13\/12E \u201cOxygen Pipeline and Piping Systems\u201d divided the Oxygen working conditions for \u201cimpact\u201d and \u201cnon-impact\u201d. The \u201cimpact \u201d is a dangerous occasion because it is easy to stimulate energy, causing combustion and explosion. The oxygen valve is the typical \u201cimpact occasion\u201d.  Oxygen valve is a type of special valve designed for an oxygen pipeline and has been widely used in metallurgy, petroleum, chemical, and other industries involving oxygen. The material of the oxygen valve is limited to working pressure and flow rate to prevent the collision of particles and impurities in the pipeline. Therefore, the engineer should fully consider friction, static electricity, non-metal ignition, possible pollutants (carbon steel surface corrosion), and other factors when selecting an oxygen valve.  Oxygen Properties  The normal concentration in air is 21% Colorless, odorless, and tasteless. Cannot be detected by the human senses Not flammable but supports and accelerates combustion. Flammable materials, including some materials that are normally relatively Non-flammable in air, burn very rapidly in high oxygen concentrations. Three elements necessary for an oxygen fire are an ignition source, oxygen, and flammable material (fuel) \u2013 known as the \u201cfire triangle\u201d  Material Used in Oxygen Valve  Organic materials have ignition temperatures below those of metals. The use of organic materials in contact with oxygen should be avoided, particularly when the material is directly in the flow stream. When an organic material must be used for parts such as valve seats, diaphragms, or packing, it is preferable to select a material with the highest ignition temperature, the lowest specific heat, and the necessary mechanical properties. Lubricants and sealing compounds should be used only if they are suitable for oxygen service and then used sparingly. Ordinary petroleum lubricants are not satisfactory and are particularly hazardous because of their high heat of combustion and high rate of reaction. The approximate ignition temperatures in 138 bar (2000 psig) oxygen for a few organic materials are shown in table 1. Table 1. Typical Ignition Temperatures    MATERIAL TYPICAL IGNITION TEMPERATURE IN 138 BAR (2000 PSIG) OXYGEN  PTFE and PCTFE 468  70% Bronze\u2010filled PTFE 468  Fluoroelastomer 316  Nylon 210  Polyethylene 182  Chloroprene and Nitrile 149    Metals  The selection of metals should be based on their resistance to ignition and rate of reaction. Following is a comparison of these two properties for some commonly used valve materials.  Resistance to Ignition in Oxygen  Materials are listed in order from hardest to ignite to easiest to ignite.  Copper, copper alloys, and nickel\u2010copper alloys \u2010\u2010 most resistant Stainless steel (300 series) Carbon steel Aluminum \u2010\u2010 least resistant  Rate of Reaction  Materials are listed in order from the slowest rate of combustion to the most rapid rate of combustion.  Copper, copper alloys, and nickel\u2010copper alloys \u2010\u2010 do not normally propagate combustion Carbon steel Stainless steel (300 series) Aluminum \u2010\u2010 burns very rapidly  Note that stainless steel, once ignited, burns more rapidly than carbon steel. Nevertheless, the austenitic grades (300 series) of stainless steel are considered to be much better than carbon steel because of their high resistance to ignition.  GET OXYGEN VALVE PRICE  How Dangerous is Oxygen  Oxygen is not combustible alone. However, if there is a combustion event, high-oxygen content means that combustible materials do burn much faster. Particle impact, rapid pressurization, or compression of materials can result in heating that could cause combustion. Contamination and mechanical energy such as friction can also cause ignition and result in fast, hot fires when more oxygen is present. The higher the concentration of oxygen, the greater the risk of combustion.  Larson pointed out that, while certain precautions must be taken with liquid oxygen, it is even more important to be vigilant when working with it in the gaseous state.  Minimizing Risk  To minimize the risk of fire, it is important to choose highly compatible materials for valves\u2014both metals and soft goods. It is also important to minimize ignition mechanisms. That can be done by minimizing soft goods and limiting the use of lubricants. It is also essential to utilizing best practices\u2014from design to manufacture, to getting the product to the site, to operating it.  How to choose a valve used for oxygen?  Some projects explicitly prohibit gate valves from being used in oxygen pipelines with design pressure greater than 0.1mpa. This is because the sealing surface of gate valves will be damaged by friction in relative motion (i.e. the opening\/closing of the valve), which causes small \u201ciron powder particles\u201d to fall off from the sealing surface and easily catch fire. Similarly, the oxygen line of another type of valve will also explode at the moment when the pressure difference between the two sides of the valve is large and the valve opens quickly.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zecovalve.com\/pt\/tag\/oxygen\" \/>\n<meta property=\"og:site_name\" content=\"ZECO Valve\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/zecovalve.com\/#website\",\"url\":\"https:\/\/zecovalve.com\/\",\"name\":\"ZECO Valve\",\"description\":\"Industrial Ball Valve, Gate Valve and Globe Valve Manufacturer\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/zecovalve.com\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"CollectionPage\",\"@id\":\"https:\/\/zecovalve.com\/tag\/oxygen#webpage\",\"url\":\"https:\/\/zecovalve.com\/tag\/oxygen\",\"name\":\"Oxygen Ball Valve - Choose Right Oxygen Valve | ZECO Valve\",\"isPartOf\":{\"@id\":\"https:\/\/zecovalve.com\/#website\"},\"breadcrumb\":{\"@id\":\"https:\/\/zecovalve.com\/tag\/oxygen#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/zecovalve.com\/tag\/oxygen\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/zecovalve.com\/tag\/oxygen#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/zecovalve.com\/\",\"url\":\"https:\/\/zecovalve.com\/\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"position\":2,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/zecovalve.com\/tag\/oxygen\",\"url\":\"https:\/\/zecovalve.com\/tag\/oxygen\",\"name\":\"oxygen\"}}]}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","_links":{"self":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags\/30","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/tags"}],"about":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/taxonomies\/post_tag"}],"wp:post_type":[{"href":"https:\/\/zecovalve.com\/pt\/wp-json\/wp\/v2\/posts?tags=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}