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ASME B16.5/B16.47 Pipe Flanges for Pipeline Construction2
Building Hardware, Fastener Fitting, Pipe Flange, Steel Pipe Flange
EZ Steel Industrial Co., Ltd.
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Product Description ASME B16.5/B16.47 Pipe Flanges For Pipeline Construction TypesWeld Neck Flanges Slip-On Flanges Blind FlangesSocket Weld FlangesMaterialCarbon Steel FlangeStainless Steel FlangesAlloy Steel FlangesSpecial AlloysSurface Raised FaceFlat FaceRing-Type Joint 1. Overview and PurposePipe flanges are integral mechanical components designed to connect sections of pipes, valves, pumps, and other equipment within a pipeline system. They form a secure, leak-proof seal while allowing for easy assembly and disassembly. This makes them essential for applications requiring routine maintenance, inspection, cleaning, or system modifications.Steel and alloy flanges are particularly valued in demanding industrial settings due to their exceptional mechanical strength, durability, and ability to perform reliably under high pressure, high temperature, and corrosive conditions. Their robust construction ensures long-term system integrity and safety.2. Common Types of FlangesDifferent flange types are available to suit specific functional and installation requirements:Weld Neck Flanges (WN):These feature a long tapered hub that is butt-welded to the pipe, providing excellent structural integrity and stress distribution. Ideal for high-pressure and high-temperature applications.Slip-On Flanges (SO):Designed to slide over the pipe and then be welded both internally and externally. They are easier to align than weld neck flanges and are suitable for lower-pressure services.Blind Flanges (BL):Used to seal the end of a piping system or vessel opening. They allow easy access for future expansion or inspection and are often employed in pressure testing.Socket Weld Flanges (SW):Similar to slip-on flanges, but with a socket for inserting the pipe before fillet welding. They are used for smaller-diameter, high-pressure piping.Lap Joint Flanges (LJ):Used with stub ends, allowing easy alignment and disassembly of systems requiring frequent maintenance. Suitable for low-pressure, non-critical applications.Threaded Flanges:These have internal threads and screw onto pipes without welding, making them suitable for low-pressure applications where welding is not feasible.3. Key Functions in Pipeline InstallationFlanges serve several vital functions:Connectivity:Enable efficient and secure joining of pipes and other components, facilitating complex pipeline layouts.Flexibility and Maintenance:Allow quick disassembly for cleaning, inspection, or repairs, reducing downtime and operational costs.System Adaptation:Simplify modifications and expansions of existing pipeline networks by enabling the integration of new components.Sealing Performance:When combined with gaskets and properly tightened bolts, flanges ensure a reliable, leak-free seal even under extreme conditions.4. Material SelectionThe choice of material depends on operational requirements:Carbon Steel Flanges:Offer good strength and are cost-effective for general-purpose applications in non-corrosive environments. Examples include ASTM A105 (forged) and A234 WPB (fabricated).Stainless Steel Flanges:Provide superior corrosion resistance and are suitable for chemical, food processing, and marine applications. Common grades include 304/304L and 316/316L.Alloy Steel Flanges:Designed for high-temperature and high-pressure services, such as in power plants and petrochemical industries. Examples include ASTM A182 F11, F22, and F91.Special Alloys:Materials like duplex stainless steel, incoloy, and hastelloy are used in highly corrosive or extreme environments.5. Facing Types and Surface FinishThe flange facing plays a critical role in sealing efficiency. Common types include:Raised Face (RF):A small raised surface around the bore helps concentrate pressure on the gasket, improving the seal.Flat Face (FF):The entire surface is flat, often used with cast iron or low-pressure applications.Ring-Type Joint (RTJ):Features a grooved surface for a metal ring gasket, ensuring a tight seal in high-pressure and high-temperature systems.6. Standards and SpecificationsFlanges are manufactured in accordance with international standards to ensure compatibility and safety. Key standards include:ASME B16.5:Covers pipe flanges and flanged fittings for sizes NPS ?" to 24".ASME B16.47:Governs large-diameter flanges for sizes NPS 26" to 60".EN 1092-1:European standard for flanges and their joints.MSS SP-44:Standard for steel pipeline flanges.Dimensional standards (e.g., ANSI, DIN, JIS) and pressure ratings (e.g., Class 150, 300, 600, 900, 1500, 2500) must be carefully matched to system requirements.7. Applications Across IndustriesSteel and alloy flanges are widely used in numerous sectors, including:Oil and gas production and refiningChemical and petrochemical processingPower generation (thermal, nuclear, and renewable)Water and wastewater treatmentShipbuilding and marine engineeringPharmaceutical and food processingCompany Profile Product Parameters Packaging & Shipping Certifications FAQ
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