{"id":974,"count":24,"description":"<h2>Blind flanges<\/h2>\r\n<strong>Blind flange<\/strong> is a flat component used to seal the end of a pipeline, nozzle, or technological device. It has the form of a solid disc with bolt holes (or without internal holes) and is designed to match a flange-to-flange connection \u2013 creating a leak-proof seal that facilitates maintenance, pressure testing, or preparing a section of the pipeline for further expansion.\r\n<h3>What is a blind flange and how does it work?<\/h3>\r\nA blind flange is a component without a flow opening \u2013 it is mounted between a pipe flange and secured with bolts. Its task is to cut off the flow of media (liquids, gases) and maintain tightness and strength parameters in accordance with the designed pressure class. In practice, there are various types of mating surfaces (e.g., raised face \u2013 RF, flat face \u2013 FF), and the choice depends on the type of seal and installation requirements.\r\n<h3>Applications of blind flanges<\/h3>\r\n<ul>\r\n \t<li><strong>Testing and maintenance:<\/strong> closing a section of the pipeline during pressure tests or repairs.<\/li>\r\n \t<li><strong>Chemical and petrochemical industry:<\/strong> leak-proof shut-off of pipes transporting aggressive media.<\/li>\r\n \t<li><strong>Food and pharmaceutical industry:<\/strong> hygienic closure of process installations (with appropriately selected steel grade and surface finish).<\/li>\r\n \t<li><strong>Shipyards and offshore:<\/strong> sealing pipe ends and equipment exposed to marine corrosion.<\/li>\r\n \t<li><strong>Construction, HVAC, automotive, workshops:<\/strong> from simple garage applications to heating and cooling installations.<\/li>\r\n<\/ul>\r\n<h3>Materials: steel types and designations<\/h3>\r\nIn our offer, all blind flanges are made exclusively of stainless steel, acid-resistant steel, or heat-resistant steel. Below is a brief explanation of the terms used and popular grades:\r\n<ul>\r\n \t<li><strong>Stainless steel (stainless steel, inox)<\/strong> \u2013 the most commonly used grades are <em>AISI 304<\/em> (European des. 1.4301, X5CrNi18-10) \u2013 good corrosion resistance under standard conditions.<\/li>\r\n \t<li><strong>Acid-resistant steel (acid-resistant steel)<\/strong> \u2013 popular grades are <em>AISI 316 \/ 316L<\/em> (1.4401 \/ 1.4404). They contain an additional molybdenum alloy, which improves resistance to chemically aggressive environments, hence they are common in the chemical, food, and marine industries.<\/li>\r\n \t<li><strong>Heat-resistant steel (heat-resistant steel)<\/strong> \u2013 special steel grades designed for operation at elevated temperatures; used where oxidation resistance and maintaining mechanical properties at high temperatures are essential.<\/li>\r\n \t<li><strong>Other functional terms:<\/strong> in colloquial language, you may encounter terms such as ferritic steel or austenitic steel \u2013 these refer to the microstructure of the alloy and affect mechanical properties as well as corrosion resistance.<\/li>\r\n<\/ul>\r\n<h3>Standards and selection parameters<\/h3>\r\nBlind flanges are manufactured to fit standard piping systems. When choosing, pay attention to:\r\n<ul>\r\n \t<li><strong>nominal diameter (DN)<\/strong> and pressure class (PN) in the European\/EN system, or ANSI\/ASME class (e.g., class 150, 300) for installations according to American standards;<\/li>\r\n \t<li><strong>bolt hole pattern and spacing<\/strong>\u2013 must match the mating flange;<\/li>\r\n \t<li><strong>mating surface type<\/strong> (RF \u2013 raised face, FF \u2013 flat face, or possibly RTJ) adapted to the gasket;<\/li>\r\n \t<li><strong>material and steel grade<\/strong>\u2013 selected based on the medium (corrosiveness, temperature) and sanitary-hygienic requirements;<\/li>\r\n \t<li><strong>thickness and construction<\/strong>\u2013 affecting strength at a given operating pressure.<\/li>\r\n<\/ul>\r\n<h3>Practical tips for installation<\/h3>\r\n<ul>\r\n \t<li>Before installation, check the compatibility of the hole spacing and pressure class.<\/li>\r\n \t<li>Select the appropriate gasket (material and shape) for the flange type and medium.<\/li>\r\n \t<li>Use the correct bolt tightening torque to ensure a uniform seal and avoid deformation.<\/li>\r\n \t<li>In chemically aggressive environments, choose acid-resistant grades (e.g., 316\/316L) \u2013 this will reduce the risk of corrosion.<\/li>\r\n<\/ul>\r\n<h3>Industries and target group<\/h3>\r\nBlind flanges are used by:\r\n<ul>\r\n \t<li>installation and service companies,<\/li>\r\n \t<li>industrial plants (chemical, petrochemical, food),<\/li>\r\n \t<li>shipyards and the offshore industry,<\/li>\r\n \t<li>HVAC companies and the construction sector,<\/li>\r\n \t<li>workshops, small manufacturing enterprises, and DIY customers looking for durable installation solutions.<\/li>\r\n<\/ul>\r\n<h3>Offer and availability<\/h3>\r\nIn our shop, you will find blind flanges made of stainless, acid-resistant, and heat-resistant steel, available in various diameters, pressure classes, and surface finishes. We are here to help with your selection \u2013 if you need to match a flange to a specific DN\/PN or ANSI\/ASME standard, provide your installation parameters, and we will advise the appropriate solution.\r\n\r\n<strong>Summary:<\/strong> Blind flanges are essential components for sealing pipeline sections and equipment. Choosing the right material (stainless steel, acid-resistant steel, heat-resistant steel), pressure class, and mating surface type ensures the safety and durability of installations in various industries \u2013 from garage setups to offshore applications.","link":"https:\/\/stalesia.com\/en\/blind-flanges\/","name":"Blind Flanges","slug":"blind-flanges","taxonomy":"product_cat","parent":0,"meta":[],"menu_order":0,"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stainless steel blind flanges - heat-resistant and acid-resistant<\/title>\n<meta name=\"description\" content=\"Choose stainless steel blind flanges from our range! We have blind flanges of various kinds, made from a variety of steel grades. 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