A blind flange is a solid disk used to terminate or close the end of a piping system, pressure vessel, or equipment opening. It is essentially a flange without a center bore (hole). Unlike other flanges that connect pipes, valves, or other equipment, the primary purpose of a blind flange is to block off a section of pipe or a nozzle, providing a secure and leak-proof seal. This allows for easy future expansion of the pipeline, safe isolation of a section for maintenance, or pressure testing.<\/p>\n
Blind flanges are manufactured from a wide variety of materials to suit different service conditions, including:<\/p>\n
Carbon Steel:<\/strong>\u00a0ASTM A105, A350 LF2.<\/p>\n<\/li>\n Stainless Steel:<\/strong>\u00a0ASTM A182 F304\/304L, F316\/316L, F321.<\/p>\n<\/li>\n Alloy Steel:<\/strong>\u00a0ASTM A182 F11, F22, F91.<\/p>\n<\/li>\n Duplex & Super Duplex Stainless Steel:<\/strong>\u00a0ASTM A182 F51, F53, F55.<\/p>\n<\/li>\n Non-Ferrous Metals:<\/strong>\u00a0Copper, Brass, Aluminum, Titanium.<\/p>\n<\/li>\n Special Alloys:<\/strong>\u00a0Inconel, Monel, Hastelloy.<\/p>\n<\/li>\n Plastics:<\/strong>\u00a0PVC, CPVC, PP, PVDF.<\/p>\n<\/li>\n<\/ul>\n Surface treatments are applied to enhance performance, improve corrosion resistance, and ensure a tight seal. Common treatments include:<\/p>\n Galvanizing:<\/strong>\u00a0A zinc coating for corrosion protection.<\/p>\n<\/li>\n Paint or Powder Coating:<\/strong>\u00a0Provides a protective layer and color coding.<\/p>\n<\/li>\n Electroplating:<\/strong>\u00a0Deposits a thin layer of metal like chrome or nickel.<\/p>\n<\/li>\n Passivation:<\/strong>\u00a0For stainless steel, to remove free iron and enhance the natural chromium oxide layer.<\/p>\n<\/li>\n Rubber or Plastic Lining:<\/strong>\u00a0For highly corrosive applications.<\/p>\n<\/li>\n<\/ul>\n Blind flanges conform to various international standards which define their dimensions, pressure ratings, and manufacturing tolerances. Key specifications include:<\/p>\n Pressure Ratings:<\/strong>\u00a0Class 150, 300, 600, 900, 1500, 2500 (ASME B16.5).<\/p>\n<\/li>\n Size Range:<\/strong>\u00a0Typically from 1\/2 inch (DN15) to over 60 inches (DN1500).<\/p>\n<\/li>\n Facing Types:<\/strong>\u00a0Raised face (RF), Flat face (FF), Ring-type joint (RTJ).<\/p>\n<\/li>\n Standards:<\/strong>\u00a0ASME B16.5, ASME B16.47, EN 1092-1, MSS SP-44, API 6A.<\/p>\n<\/li>\n<\/ul>\n Blind flanges are critical components in numerous industries for isolation, safety, and testing purposes. Their main applications are in:<\/p>\n Oil and Gas Industry:<\/strong>\u00a0Pipeline systems, refineries, offshore platforms.<\/p>\n<\/li>\n Chemical and Petrochemical Plants:<\/strong>\u00a0For handling corrosive fluids.<\/p>\n<\/li>\n Water and Wastewater Treatment:<\/strong>\u00a0Isolating sections of water mains.<\/p>\n<\/li>\n Power Generation:<\/strong>\u00a0In boiler systems and steam lines.<\/p>\n<\/li>\n Shipbuilding and Marine Engineering:<\/strong>\u00a0Piping systems on vessels.<\/p>\n<\/li>\n Pharmaceutical and Food Processing:<\/strong>\u00a0Where hygiene and isolation are crucial.<\/p>\n<\/li>\n<\/ul>\n A new section of a high-pressure natural gas pipeline was installed and needed testing before use. Engineers sealed the end with a Class 600, 24-inch carbon steel raised-face blind flange<\/strong>, then filled the pipeline with water and pressurized it above normal levels. The blind flange held the pressure perfectly, proving that all welds and fittings were leak-free and safe. After testing, the flange could be removed to connect the next section. This step was essential to ensure long-term safety and prevent failures.<\/p>","protected":false},"excerpt":{"rendered":" Custom CNC Machining Blind Flange Reliable Stainless Steel High Pressure Blind Flanges<\/p>","protected":false},"featured_media":4160,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[27],"product_tag":[2941,2942,2945,2940,2939,2943,2937,911,914,909,917,1396,912,907,910,908,2944,2938],"class_list":{"0":"post-4158","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-small-cnc-machining","7":"product_tag-3-blind-flange","8":"product_tag-4-blind-flange","9":"product_tag-4-inch-blind-flange","10":"product_tag-8-blind-flange","11":"product_tag-blind-flange","12":"product_tag-blind-flange-6","13":"product_tag-blind-flanges","14":"product_tag-cnc-machining-parts","15":"product_tag-custom-cnc-machining-parts","16":"product_tag-customized-small-cnc-machining-parts","17":"product_tag-oem-cnc-machining-parts","18":"product_tag-precision-cnc-machining","19":"product_tag-precision-cnc-machining-parts","20":"product_tag-small-cnc-machining","21":"product_tag-small-cnc-machining-part","22":"product_tag-small-cnc-machining-parts","23":"product_tag-stainless-steel-blind-flange","24":"product_tag-stainless-steel-blind-flanges","26":"first","27":"instock","28":"shipping-taxable","29":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/product\/4158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/comments?post=4158"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/media\/4160"}],"wp:attachment":[{"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/media?parent=4158"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/product_brand?post=4158"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/product_cat?post=4158"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/machinedwasher.com\/nl\/wp-json\/wp\/v2\/product_tag?post=4158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nSurface Treatments<\/h2>\n
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\nSpecifications<\/h2>\n
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\nApplication Fields<\/h2>\n
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\nExcellent\u00a0 Case:\u00a0Pressure Testing a New Pipeline Section<\/strong><\/h2>\n