{"id":933,"date":"2026-04-11T01:57:13","date_gmt":"2026-04-11T05:57:13","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=933"},"modified":"2026-04-11T01:58:38","modified_gmt":"2026-04-11T05:58:38","slug":"understanding-flange-face-types-rf-ff-rtj-and-when-to-use-each","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/it\/2026\/04\/11\/understanding-flange-face-types-rf-ff-rtj-and-when-to-use-each\/","title":{"rendered":"Conoscere i tipi di superfici flangiate: RF, FF, RTJ e quando utilizzarli"},"content":{"rendered":"<h2>Introduzione<\/h2>\n<p>The flange face type is one of the most critical design considerations in piping systems. Choosing the wrong face type can lead to leaks, premature gasket failure, and costly maintenance. This guide explains the main flange face types and their optimal applications.<\/p>\n<h2>Faccia rialzata (RF)<\/h2>\n<h3>Characteristics<\/h3>\n<p>Raised Face flanges have a raised ring around the bore that concentrates gasket pressure for better sealing. The raised height varies by pressure class:<\/p>\n<ul>\n<li>Class 150 &#038; 300: 1.6mm (1\/16&#8243;) raised face<\/li>\n<li>Class 600 and above: 6.4mm (1\/4&#8243;) raised face<\/li>\n<\/ul>\n<h3>Applicazioni<\/h3>\n<ul>\n<li>Most common in oil &#038; gas industry<\/li>\n<li>Suitable for temperatures from -20\u00b0C to 400\u00b0C<\/li>\n<li>Works with spiral wound, graphite, and non-asbestos gaskets<\/li>\n<li>Pressure ratings up to Class 2500<\/li>\n<\/ul>\n<h2>Faccia piana (FF)<\/h2>\n<h3>Characteristics<\/h3>\n<p>Flat Face flanges have a completely flat sealing surface with no raised portion. The gasket covers the entire face.<\/p>\n<h3>Applicazioni<\/h3>\n<ul>\n<li>Cast iron and brittle material flanges<\/li>\n<li>Low pressure applications (Class 125 &#038; 250)<\/li>\n<li>Prevents bending stress on brittle materials<\/li>\n<li>Common in water treatment and HVAC systems<\/li>\n<\/ul>\n<h2>Giunto ad anello (RTJ)<\/h2>\n<h3>Characteristics<\/h3>\n<p>RTJ flanges use a metal ring gasket that sits in a machined groove. When bolted, the ring deforms to create a metal-to-metal seal.<\/p>\n<h3>Applicazioni<\/h3>\n<ul>\n<li>High-pressure systems (Class 600 to 2500)<\/li>\n<li>High-temperature applications up to 800\u00b0C<\/li>\n<li>Offshore platforms and subsea pipelines<\/li>\n<li>Refineries and petrochemical plants<\/li>\n<\/ul>\n<h2>Other Face Types<\/h2>\n<h3>Maschio e femmina (T&amp;G)<\/h3>\n<p>Provides excellent gasket alignment and compression. Used in pump housings and valve bonnets.<\/p>\n<h3>Maschio e femmina (M&amp;F)<\/h3>\n<p>Self-aligning design with good gasket retention. Common in heat exchangers.<\/p>\n<h2>Selection Guide<\/h2>\n<table>\n<tr>\n<th>Application<\/th>\n<th>Recommended Face Type<\/th>\n<\/tr>\n<tr>\n<td>General oil &#038; gas<\/td>\n<td>Faccia rialzata (RF)<\/td>\n<\/tr>\n<tr>\n<td>High pressure (>600#)<\/td>\n<td>RTJ or RF<\/td>\n<\/tr>\n<tr>\n<td>Cast iron piping<\/td>\n<td>Faccia piana (FF)<\/td>\n<\/tr>\n<tr>\n<td>Offshore\/subsea<\/td>\n<td>RTJ<\/td>\n<\/tr>\n<tr>\n<td>Water systems<\/td>\n<td>Faccia piana (FF)<\/td>\n<\/tr>\n<\/table>\n<h2>Conclusione<\/h2>\n<p>Understanding flange face types ensures proper sealing and system integrity. Always consult with your flange manufacturer to confirm the best choice for your specific application.<\/p>\n<p><strong>WhatsApp:<\/strong>\u00a0+86-18658777855<\/p>\n<p><strong>E-mail:<\/strong>\u00a01007788887@qq.com<\/p>\n<p>\u2713 MTR con rapporti NDT \u2713 Ispezione da parte di terzi benvenuta<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" title=\"\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Complete guide to flange face types including RF, FF, and RTJ. Learn when to use each type for optimal sealing performance.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-933","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/933","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/comments?post=933"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/933\/revisions"}],"predecessor-version":[{"id":941,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/933\/revisions\/941"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/media?parent=933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/categories?post=933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/tags?post=933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}