{"id":300,"count":3,"description":"<p>A flange is a disc- or ring-shaped mechanical fitting used to connect sections of piping together or to connect pipes to valves, pumps, pressure vessels, and various other auxiliary equipment. Flanged connections allow for flexible and convenient disassembly, inspection, and maintenance of a system compared with permanent direct welding.<\/p>\n\n<h2>General Information About Flanges<\/h2>\n\n<p>In terms of mechanical construction, a flange consists of the following main components:<\/p>\n\n<table>\n<thead>\n<tr>\n<td><strong>Component<\/strong><\/td>\n<td><strong>Function<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<div><b>Flange Body<\/b><\/div>\n<\/td>\n<td>The solid-cast or machined metal disc or ring that bears the primary pressure of the piping system.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Hub\/Neck<\/b><\/div>\n<div><i>(only found on weld neck, slip-on, threaded, and similar flange types)<\/i><\/div>\n<\/td>\n<td>The extended section used to weld or connect the flange to the pipe by threading.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Bore<\/b><\/div>\n<div><i>(not present on blind flanges)<\/i><\/div>\n<\/td>\n<td>The opening at the center of the flange that allows fluid to pass through.<\/td>\n<\/tr>\n<tr>\n<td><b>Bolt Holes<\/b><\/td>\n<td>Evenly distributed holes around the flange, used to insert bolts for connecting it to the mating flange.<\/td>\n<\/tr>\n<tr>\n<td><b>Facing<\/b><\/td>\n<td>The machined surface on the front of the flange, such as Flat Face (FF), Raised Face (RF), or Ring Type Joint (RTJ), where the gasket makes contact to provide a seal.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<p><em>(Note: When fully installed in a system, the flange is combined with additional components, including a sealing gasket and a set of bolts and nuts, to create a leak-tight connection.)<\/em><\/p>\n\n<h2>What Types of Flanges Are Available on the Market?<\/h2>\n\n<p>Depending on pressure, temperature, and installation requirements, flanges are designed with various connection types:<\/p>\n\n<table>\n<thead>\n<tr>\n<td><strong>Flange Type<\/strong><\/td>\n<td><strong>Characteristics<\/strong><\/td>\n<td><strong>Applications<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<div><b>Weld Neck Flange<\/b><\/div>\n<div>(WN)<\/div>\n<\/td>\n<td>Features a long tapered neck and is butt-welded to the pipe. It provides excellent stress distribution and can withstand extremely high temperatures and pressures.<\/td>\n<td>High-pressure and high-temperature piping systems, such as those used in thermal power plants, chemical processing, and oil and gas industries.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Slip-On Flange<\/b><\/div>\n<div>(SO)<\/div>\n<\/td>\n<td>The inner diameter is larger than the pipe's outer diameter, allowing the pipe to slide inside the flange before being welded on both the inside and outside.<\/td>\n<td>Low- to medium-pressure piping systems where easy installation and alignment are required.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Blind Flange<\/b><\/div>\n<div>(BL)<\/div>\n<\/td>\n<td>A solid flange without a central opening, used to seal the end of a pipeline or block off a branch connection.<\/td>\n<td>Pipeline ends, drain points, or spare branches intended for future expansion.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Threaded Flange<\/b><\/div>\n<div>(TH)<\/div>\n<\/td>\n<td>Connects to the pipe using internal threads without requiring welding.<\/td>\n<td>Small-diameter piping systems, typically below DN50, and locations where welding is prohibited due to fire or explosion risks.<\/td>\n<\/tr>\n<tr>\n<td>\n<div><b>Lap Joint Flange<\/b><\/div>\n<div>(LJ)<\/div>\n<\/td>\n<td>Used with a short pipe end (stub end), allowing the flange to rotate freely around the pipe before the bolts are tightened.<\/td>\n<td>Systems requiring frequent disassembly for cleaning or locations where aligning bolt holes is difficult.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<h2>Guidelines for Selecting and Installing Flanges Correctly<\/h2>\n\n<p>To ensure safe system operation and prevent fluid leakage, product loss, or safety hazards, the following factors should be considered when selecting and installing flanges.<\/p>\n\n<h3>Check Compatibility of Flange Standards<\/h3>\n\n<p>Flanges are manufactured according to various international standards, such as BS (British), JIS (Japanese), ANSI\/ASME (American), and DIN (German). Each standard specifies different bolt-hole patterns, outside diameters, and thicknesses. Connecting two flanges made to different standards may prevent the bolts from passing through the holes or result in uneven pressure on the sealing surface, causing leakage during commissioning.<\/p>\n\n<h3>Tighten Bolts in the Correct Sequence and to the Specified Torque<\/h3>\n\n<p>During installation, bolts should not be tightened one by one in a circular sequence. This can cause the flange to tilt and result in uneven gasket compression. The correct method is to tighten the bolts in a crisscross or star pattern, gradually increasing the tightening force with each pass until the specified torque is reached.<\/p>\n\n<h3>Calculate the Required Clearance Before Installation<\/h3>\n\n<p>When designing a piping system, sufficient clearance should be provided between the two flanges to allow the gasket to be inserted easily and provide enough space for tightening the nuts. Insufficient clearance can cause the gasket to be scratched during installation, significantly reducing the service life of the connection.<\/p>\n\n<p>If you are looking for a reliable flange supplier offering a wide range of types and standards, An Phu Thanh is a supplier worth considering. We maintain large stocks of steel, stainless steel, and cast iron flanges in sizes ranging from DN10 to DN1000. All products are guaranteed to meet technical specifications and are supplied with complete CO\/CQ documentation and VAT invoices.<\/p>\n\n<p>You can refer to the flange models currently available from An Phu Thanh below, with detailed information on materials, pressure ratings, and connection types.<\/p>\n\n<p>For the fastest quotation and professional advice on selecting the appropriate flange specifications for your project, please contact us via Hotline or Zalo OA at <a href=\"tel:0946 729 913\">0946 729 913<\/a>. An Phu Thanh's experienced technical team is always ready to assist you.<\/p>\n","link":"https:\/\/anphuthanhvalve.com\/en\/flange\/","name":"Flange","slug":"flange","taxonomy":"product_cat","parent":301,"meta":[],"menu_order":0,"acf":[],"_links":{"self":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat\/300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat"}],"about":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/taxonomies\/product_cat"}],"up":[{"embeddable":true,"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat\/301"}],"wp:post_type":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product?product_cat=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}