{"id":975,"count":11,"description":"<h2>Loose flanges \u2013 what are they?<\/h2>\r\n<strong>Loose flanges<\/strong> (also known as lap joint flanges) are a type of flange that is not permanently attached to the pipe, but rather slides freely over it or over a short attachment component called a <strong>stub end<\/strong>. This allows the flange to rotate relative to the pipe, which facilitates installation and bolt alignment during the connection of pipelines. These flanges are commonly used where frequent disassembly\/inspection of connections is required or when the pipe material requires separate joining (e.g., in systems with replaceable components).\r\n<h3>Structure and characteristic features<\/h3>\r\nA typical loose flange assembly consists of:\r\n<ul>\r\n \t<li><strong>loose flange<\/strong>\u2013 a ring with bolt holes that slides over the attachment element;<\/li>\r\n \t<li><strong>stub end<\/strong>\u2013 a short element welded or mounted to the pipe, on which the loose flange rests;<\/li>\r\n \t<li><strong>sealing<\/strong>\u2013 an appropriate gasket selected for the operating conditions (temperature, medium, pressure).<\/li>\r\n<\/ul>\r\nLoose flanges come with different types of mating surfaces (e.g., <strong>raised face (RF)<\/strong>, <strong>flat face (FF)<\/strong>, <strong>RTJ<\/strong>) \u2013 the choice depends on pressure and tightness requirements.\r\n<h3>What steels do we use for loose flanges?<\/h3>\r\nOur offer includes flanges made exclusively of corrosion-resistant and high-temperature-resistant steels. The most commonly used materials are:\r\n<ul>\r\n \t<li><strong>stainless steel<\/strong>\u2013 e.g., AISI 304 (EN 1.4301) \u2013 for general use, good corrosion resistance under standard conditions;<\/li>\r\n \t<li><strong>acid-resistant steel<\/strong>\u2013 e.g., AISI 316L (EN 1.4404) \u2013 better resistance to chlorides and chemical environments, often used in the chemical, marine, and food industries;<\/li>\r\n \t<li><strong>heat-resistant steel<\/strong>\u2013 e.g., AISI 310 (EN 1.4845) and related grades \u2013 used where elevated temperatures and oxidation occur.<\/li>\r\n<\/ul>\r\nIn the product descriptions, we use both colloquial names (stainless steel, acid-resistant steel, heat-resistant steel) and technical designations (AISI\/ASTM for the USA, EN\/1.x for Europe) to facilitate the selection of the appropriate material.\r\n<h3>Where and in which industries are loose flanges used?<\/h3>\r\n<strong>Loose flanges<\/strong> are widely used in piping installations where easy assembly, flange rotation capability, and quick disassembly are important. Typical industries and applications:\r\n<ul>\r\n \t<li>chemical and petrochemical industry \u2013 process installations and transport of aggressive media (in combination with acid-resistant steel);<\/li>\r\n \t<li>food and pharmaceutical industry \u2013 installations requiring frequent disassembly and cleaning;<\/li>\r\n \t<li>offshore and shipbuilding \u2013 marine installations where corrosion resistance and the possibility of replacing elements are key;<\/li>\r\n \t<li>HVAC and water installations \u2013 water, steam, and coolant transmission systems;<\/li>\r\n \t<li>automotive and heavy industry \u2013 exhaust systems, technological sewage;<\/li>\r\n \t<li>construction and sanitary installations \u2013 connections where ease of assembly is required;<\/li>\r\n \t<li>small workshops and garage projects \u2013 where simple assembly and the possibility of later modification are important.<\/li>\r\n<\/ul>\r\n<h3>Standards, dimensions, and flange selection<\/h3>\r\nLoose flanges are manufactured in accordance with commonly used standards and pressure classes, including:\r\n<ul>\r\n \t<li><strong>EN\/DIN<\/strong> (e.g., EN 1092-1) \u2013 typical for the European market;<\/li>\r\n \t<li><strong>PN<\/strong> (PN10, PN16, PN25, etc.) \u2013 pressure classes used in Poland and Europe;<\/li>\r\n \t<li><strong>ANSI\/ASME<\/strong> (e.g., ASME B16.5) \u2013 standards often used on the American market (e.g., Class 150\/300).<\/li>\r\n<\/ul>\r\nWhen selecting a flange, pay attention to: nominal pipe diameter (DN\/NPS), pressure class, material, sealing surface type, and surface treatment requirements (e.g., polishing in the food industry).\r\n<h3>Why choose loose flanges?<\/h3>\r\n<strong>Loose flanges<\/strong> offer several practical advantages:\r\n<ul>\r\n \t<li>ease of alignment and assembly thanks to the ability to rotate the flange;<\/li>\r\n \t<li>simplified disassembly of the installation for maintenance or replacement of elements;<\/li>\r\n \t<li>the possibility of using different materials for the flange and stub end depending on corrosion and temperature requirements;<\/li>\r\n \t<li>versatility of applications \u2013 from small installations to heavy industry and offshore.<\/li>\r\n<\/ul>\r\n<h3>How to choose a flange \u2013 practical tips<\/h3>\r\nWhen choosing a loose flange, define the basic parameters of the installation: type of medium, operating temperature and pressure, required tightness class, pipe diameter, and environment (e.g., seawater, chemicals). For corrosive installations, choose acid-resistant steel (e.g., AISI 316L \/ EN 1.4404), and where high temperatures occur \u2013 heat-resistant steel (e.g., AISI 310 \/ EN 1.4845). If you are not sure, our specialists will help you choose the material and standard in accordance with the project requirements.\r\n<h3>Need help?<\/h3>\r\nIf you have questions regarding sizes, materials (e.g., 1.4301, 1.4404, 1.4845), standards (EN, DIN, ASME), or would like to receive an offer for loose flanges for a specific application \u2013 please contact us. We will help you choose the best solution tailored to your needs.","link":"https:\/\/stalesia.com\/en\/loose-flanges\/","name":"Loose Flanges","slug":"loose-flanges","taxonomy":"product_cat","parent":0,"meta":[],"menu_order":0,"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stainless steel loose flanges (weld-on flanges) - check out our offer<\/title>\n<meta name=\"description\" content=\"Choose loose flanges from our range! We stock flanges in various sizes, made from a variety of stainless steel grades. 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