{"id":3718,"date":"2026-01-14T15:56:02","date_gmt":"2026-01-14T14:56:02","guid":{"rendered":"https:\/\/slobrides.si\/?p=3718"},"modified":"2026-02-20T14:17:37","modified_gmt":"2026-02-20T13:17:37","slug":"izbira-prirobnice-en-1092-1-tlak-medij-temperatura","status":"publish","type":"post","link":"https:\/\/slobrides.si\/en\/izbira-prirobnice-en-1092-1-tlak-medij-temperatura\/","title":{"rendered":"How to Choose the Right EN 1092\u20111 Flange Based on Pressure, Medium and Temperature"},"content":{"rendered":"<p>Pri na\u010drtovanju ali vzdr\u017eevanju cevnih sistemov je pravilna izbira EN 1092-1 prirobnice klju\u010dna za varno, zanesljivo in dolgotrajno delovanje. <a href=\"https:\/\/www.nen.nl\/en\/nen-en-1092-1-2018-en-245815\" target=\"_blank\" rel=\"noopener\">Standard EN 1092\u20111<\/a> it defines the dimensions, shapes, sealing surfaces and pressure ratings of carbon\u2011steel flanges, but in practice one question often arises: Which flange should be selected based on pressure, medium and temperature.<\/p>\n\n\n\n<p>Below is an overview of the key criteria that help engineers and purchasers make the correct selection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Pressure Rating (PN) \u2013 the fundamental starting point for selection<\/strong><\/h2>\n\n\n\n<p>EN 1092\u20111 prirobnice so v standardu razvr\u0161\u010dene v razli\u010dne tla\u010dne razrede:<\/p>\n\n\n\n<p><strong>PN 2,5 \u2013 PN 6 \u2013 PN 10 \u2013 PN 16 \u2013 PN 25 \u2013 PN 40 \u2013 PN 63\/64 \u2013 PN 100<\/strong><\/p>\n\n\n\n<p>The pressure rating defines the maximum allowable operating pressure at the reference temperature of +20\u202f\u00b0C. At higher temperatures, the allowable pressure decreases, which is why the PN rating must always be checked together with the temperature tables.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Typical applications by PN rating<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>PN 2,5<\/strong> \u2013 ventilation, low\u2011pressure water supply systems<\/li>\n\n\n\n<li><strong>PN 6<\/strong> \u2013 low\u2011pressure industrial systems<\/li>\n\n\n\n<li><strong>PN 10 \/ PN 16<\/strong> \u2013 the most common choice in the industry<\/li>\n\n\n\n<li><strong>PN 25 \/ PN 40<\/strong> \u2013 higher pressures, steam, thermal oils<\/li>\n\n\n\n<li><strong>PN 63 \/ PN 64<\/strong> \u2013 high\u2011pressure processes, refineries, chemical industry<\/li>\n\n\n\n<li><strong>PN 100<\/strong> \u2013 extreme pressures and temperatures, energy sector<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Medium temperature \u2013 impact on the allowable pressure<\/strong><\/h2>\n\n\n\n<p>Temperature directly affects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mechanical properties of steel<\/li>\n\n\n\n<li>allowable operating pressure<\/li>\n\n\n\n<li>gasket selection<\/li>\n\n\n\n<li>selection of the sealing surface<\/li>\n<\/ul>\n\n\n\n<p>At temperatures above 120\u202f\u00b0C, the allowable pressure of most materials decreases significantly. Therefore, for hot water, steam or thermal oils, a higher PN rating is often required even when the nominal system pressure is not high.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Type of medium \u2013 impact on material and sealing<\/strong><\/h2>\n\n\n\n<p>Medium affects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>gasket selection<\/li>\n\n\n\n<li>selection of the sealing surface (RF, FF, RTJ)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.cencenelec.eu\/european-standardization\/european-standards\/\" target=\"_blank\" rel=\"noopener\">selection of the flange material (e.g. P245GH for higher temperatures or other materials)<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Practical examples<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Water, air, neutral media<\/strong> \u2013 RF, PN10\u2013PN16<\/li>\n\n\n\n<li><strong>Steam<\/strong> PN25\u2013PN100, Type 11, graphite gaskets<\/li>\n\n\n\n<li><strong>Oils and fuels<\/strong> \u2013 RF or FF<\/li>\n\n\n\n<li><strong>Abrasive or aggressive fluids<\/strong> \u2013 special gaskets, compatibility check<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Sealing surface \u2013 a key element of tightness<\/strong><\/h2>\n\n\n\n<p>Most common sealing surfaces according to EN 1092\u20111:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>RF (Raised Face)<\/strong><\/h3>\n\n\n\n<p>The most widespread choice in the industry.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>FF (Flat Face)<\/strong><\/h3>\n\n\n\n<p>It is used with cast\u2011iron components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>RTJ (Ring Type Joint)<\/strong><\/h3>\n\n\n\n<p>For high pressures and temperatures, often used in refineries.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. Flange type \u2013 selection based on installation method<\/strong><\/h2>\n\n\n\n<p>Most common types according to EN 1092\u20111:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Type 01 \u2013 Plate flange<\/strong><\/li>\n\n\n\n<li><strong>Type 11 \u2013 Weld neck flange<\/strong><\/li>\n\n\n\n<li><strong>Type 13 \u2013 Loose plate flange with welding ring<\/strong><\/li>\n\n\n\n<li><strong>Type 21 \u2013 Blind flange<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When to choose each type?<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tipo 01<\/strong> \u2013 simple applications, lower pressures<\/li>\n\n\n\n<li><strong>Type 11<\/strong> \u2013 the safest choice for higher pressures and temperatures<\/li>\n\n\n\n<li><strong>Type 13<\/strong> \u2013 for stainless\u2011steel pipes or systems where flexibility is required<\/li>\n\n\n\n<li><strong>Type 21<\/strong> \u2013 system closure, testing, maintenance<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-uagb-image aligncenter uagb-block-0c35e5b7 wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-center\"><figure class=\"wp-block-uagb-image__figure\"><img decoding=\"async\" data-srcset=\"https:\/\/slobrides.si\/wp-content\/uploads\/2025\/05\/SC02483-1024x631.jpg ,https:\/\/slobrides.si\/wp-content\/uploads\/2025\/05\/SC02483.jpg 780w, https:\/\/slobrides.si\/wp-content\/uploads\/2025\/05\/SC02483.jpg 360w\" data-sizes=\"auto, (max-width: 480px) 150px\" data-src=\"https:\/\/slobrides.si\/wp-content\/uploads\/2025\/05\/SC02483-1024x631.jpg\" alt=\"Assorted carbon steel flanges including weld neck, blind, threaded, and slip-on types\" class=\"uag-image-737 lazyload\" width=\"657\" height=\"405\" title=\"Carbon Steel Flanges \u2013 Assorted Types for Industrial Use\" role=\"img\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 657px; --smush-placeholder-aspect-ratio: 657\/405;\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. Extended pressure ratings covered by Slobrides<\/strong><\/h2>\n\n\n\n<p>Slobrides, in addition to the standard PN10\u2013PN40, also supplies flanges in the following ratings:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PN 2,5<\/strong><\/h3>\n\n\n\n<p>For ventilation, low\u2011pressure water systems, and applications with minimal loads.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PN 63 \/ PN 64<\/strong><\/h3>\n\n\n\n<p>For high\u2011pressure industrial processes, refineries, steam systems, and the chemical industry. Most commonly used in combination with Type\u202f11.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PN 100<\/strong><\/h3>\n\n\n\n<p>For the most demanding applications where extreme pressures and temperatures are present. Often used in combination with RTJ sealing faces.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. Practical selection examples<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Example 1: Hot water 120\u202f\u00b0C<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PN16 ali PN25<\/li>\n\n\n\n<li>RF<\/li>\n\n\n\n<li>Type 11<\/li>\n\n\n\n<li>Material P245GH<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Example 2: Steam 180\u202f\u00b0C<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PN25\u2013PN40 or PN63<\/li>\n\n\n\n<li>Type 11<\/li>\n\n\n\n<li>Graphite gasket<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Example 3: High\u2011pressure process 250\u202f\u00b0C<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PN63 or PN100<\/li>\n\n\n\n<li>Type 11<\/li>\n\n\n\n<li>RTJ (if required by the project)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Example 4: Cold water 20\u202f\u00b0C<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PN10 or PN16<\/li>\n\n\n\n<li>Type 01 or Type 11<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>The correct selection of an EN\u202f1092\u20111 flange requires an understanding of three key parameters: pressure, temperature, and medium. Once these factors are defined, it becomes possible to choose the appropriate pressure rating, sealing face, flange type, and material that ensures safe and reliable operation of the piping system.<\/p>\n\n\n\n<p>As a distributor of carbon\u2011steel flanges and fittings, Slobrides supports engineers and purchasers in technical specification and ensures compliance with European and international standards.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Pri na\u010drtovanju ali vzdr\u017eevanju cevnih sistemov je pravilna izbira EN 1092-1 prirobnice klju\u010dna za varno, zanesljivo in dolgotrajno delovanje. Standard EN 1092\u20111 dolo\u010da dimenzije, oblike, tesnilne povr\u0161ine in tla\u010dne razrede prirobnic iz ogljikovega jekla, vendar se v praksi pogosto pojavi vpra\u0161anje: Katero prirobnico izbrati glede na tlak, medij in temperaturo? V nadaljevanju predstavljamo pregled najpomembnej\u0161ih [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[114],"tags":[63,115,61,58,74,27,62,33],"class_list":["post-3718","post","type-post","status-publish","format-standard","hentry","category-flanges","tag-carbon-steel-flanges","tag-en-1092-1-prirobnice","tag-p235tr2","tag-p245gh","tag-pipeline-components","tag-slobrides","tag-steel-grades","tag-tehnicna-razlaga"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Slobrides","author_link":"https:\/\/slobrides.si\/en\/author\/slobrides\/"},"uagb_comment_info":0,"uagb_excerpt":"Pri na\u010drtovanju ali vzdr\u017eevanju cevnih sistemov je pravilna izbira EN 1092-1 prirobnice klju\u010dna za varno, zanesljivo in dolgotrajno delovanje. Standard EN 1092\u20111 dolo\u010da dimenzije, oblike, tesnilne povr\u0161ine in tla\u010dne razrede prirobnic iz ogljikovega jekla, vendar se v praksi pogosto pojavi vpra\u0161anje: Katero prirobnico izbrati glede na tlak, medij in temperaturo? V nadaljevanju predstavljamo pregled najpomembnej\u0161ih&hellip;","_links":{"self":[{"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/posts\/3718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/comments?post=3718"}],"version-history":[{"count":4,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/posts\/3718\/revisions"}],"predecessor-version":[{"id":3752,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/posts\/3718\/revisions\/3752"}],"wp:attachment":[{"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/media?parent=3718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/categories?post=3718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/slobrides.si\/en\/wp-json\/wp\/v2\/tags?post=3718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}