{"id":69537,"date":"2026-05-17T17:26:50","date_gmt":"2026-05-17T17:26:50","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/ansi-asme-b16-5\/"},"modified":"2026-05-19T15:29:25","modified_gmt":"2026-05-19T15:29:25","slug":"ansi-asme-b16-5","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/ansi-asme-b16-5\/","title":{"rendered":"ANSI \/ ASME B16.5"},"content":{"rendered":"<h2>ASME\/ANSI B16.5 Technical Standards: Overview and Scope<\/h2>\n<p>The ASME\/ANSI B16.5 standard is a fundamental regulatory document in the global pipeline industry. It regulates the parameters of flanges and flanged fittings in the size range from NPS 1\/2&#8243; to NPS 24&#8243;. The document sets strict requirements for geometric dimensions, tolerances, weight characteristics, and pressure ratings (Class 150 \u2013 2500 psi). For large-diameter flanges (NPS 26&#8243;\u201360&#8243;), the accompanying standard ASME\/ANSI B16.47 is applied.<\/p>\n<p>EV Group China provides high-quality flanged connections that fully comply with these international regulations, ensuring their compatibility with mating equipment in critical engineering systems.<\/p>\n<p>The standard defines:<\/p>\n<ul>\n<li>Pressure classes: 150, 300, 400, 600, 900, 1500 (for the entire NPS 1\/2&#8243;\u201324&#8243; range) and 2500 (for NPS 1\/2&#8243;\u201312&#8243;).<\/li>\n<li>Requirements for manufacturing materials, testing, and bolt hole marking methods.<\/li>\n<li>Rules for gasket installation and bolted connections.<\/li>\n<\/ul>\n<h2>Typology of Flanges According to ASME\/ANSI B16.5 Classification<\/h2>\n<p>EV Group China&#8217;s assortment includes all types of flange products provided by the standard:<\/p>\n<ul>\n<li><strong>Slip On (SO) Flange<\/strong>: Flat welding flanges. Optimal for low pressure (Class 150\/300). Easy to install, they slide over the pipe and are secured with two fillet welds.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/SO 200x200.png\" alt=\"ASME B16.5 Slip On Flange\" title=\"ASME B16.5 Slip On Flange\"><\/p>\n<ul>\n<li><strong>Welding Neck (WN) Flange<\/strong>: Welding neck flanges. Feature a tapered transition (hub), providing high strength and resistance to cyclic loads. Recommended for high-temperature and high-pressure environments (Class 150\u20132500).<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/WN 200x200.png\" alt=\"ASME B16.5 Welding Neck Flange\" title=\"ASME B16.5 Welding Neck Flange\"><\/p>\n<ul>\n<li><strong>Socket Weld (SW) Flange<\/strong>: Socket weld flanges. Used primarily for small-diameter pipelines (up to NPS 4). Installation is carried out by inserting the pipe into a special socket and subsequent welding.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/SW 200x200.png\" alt=\"ASME B16.5 Socket Weld Flange\" title=\"ASME B16.5 Socket Weld Flange\"><\/p>\n<ul>\n<li><strong>Threaded (ST) Flange<\/strong>: Threaded flanges. Used in conditions where welding is prohibited due to fire safety requirements. Applied for small diameters (NPS 1\/2&#8243;\u20133&#8243;).<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/THRD 200x200.png\" alt=\"ASME B16.5 Threaded Flange\" title=\"ASME B16.5 Threaded Flange\"><\/p>\n<ul>\n<li><strong>Lap Joint (LJ) Flange<\/strong>: Lap joint flanges. Ideal for systems requiring frequent disassembly. They allow for easy alignment of bolt holes thanks to the rotating design.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/LJ 200x200.png\" alt=\"ASME B16.5 Lap Joint Flange\" title=\"ASME B16.5 Lap Joint Flange\"><\/p>\n<ul>\n<li><strong>Blind (BL) Flange<\/strong>: Blind flanges for sealing the end sections of pipelines.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/BL 200x200.png\" alt=\"ASME B16.5 Blind Flange\" title=\"ASME B16.5 Blind Flange\"><\/p>\n<h2>Types of Sealing Surfaces<\/h2>\n<p>The choice of surface depends on sealing capacity and operating conditions:<\/p>\n<table class=\"table table-bordered table-hover\">\n<tr>\n<th>Type<\/th>\n<th>Description<\/th>\n<\/tr>\n<tr>\n<td>RF (Raised Face)<\/td>\n<td>With a raised face (the most common type).<\/td>\n<\/tr>\n<tr>\n<td>FF (Flat Face)<\/td>\n<td>Flat surface for use with full-face gaskets.<\/td>\n<\/tr>\n<tr>\n<td>RTJ (Ring Type Joint)<\/td>\n<td>For oval ring gaskets, designed for high pressures.<\/td>\n<\/tr>\n<\/table>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/\u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u044c-FF.jpg\" alt=\"Flange surface types\" title=\"FF\"><br \/>\n<img decoding=\"async\" src=\"\/image\/catalog\/wiki\/\u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u044c-RF\u0438LM.jpg\" alt=\"Flange surface types\" title=\"RF\"><br \/>\n<img decoding=\"async\" src=\"\/image\/catalog\/wiki\/\u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u044c-RJ.jpg\" alt=\"Flange surface types\" title=\"RJ\"><\/p>\n<h2>Materials and Specifications<\/h2>\n<p>EV Group China supplies flanges made of steel that complies with international ASTM standards:<\/p>\n<ul>\n<li>ASTM A105: Carbon steel for general piping.<\/li>\n<li>ASTM A182: Alloy and stainless grades for high temperatures.<\/li>\n<li>ASTM A350: Low-temperature steels with high impact toughness.<\/li>\n<li>ASTM B462\/B564: Nickel and corrosion-resistant alloys.<\/li>\n<\/ul>\n<h2>Tolerances and Quality Control<\/h2>\n<p>All products undergo strict control of geometric parameters. Tolerances for bolt hole center-to-center distances and flange thickness are within \u00b11.0\u20133.0 mm, ensuring precision assembly at the customer&#8217;s site.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[110],"class_list":["post-69537","wiki","type-wiki","status-publish","hentry","wiki_category-asme"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69537","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69537\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69537"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69537"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}