ASME B16.47 FLANGE

ASME B16.47 is a standard developed by the American Society of Mechanical Engineers (ASME) that covers flanges for use in piping systems. The standard specifies the dimensions, materials, pressure-temperature ratings, and other key characteristics for large-diameter flanges. ASME B16.47 is crucial for ensuring compatibility and reliability in industrial piping systems.Here’s a complete overview of ASME B16.47 flanges:ASME B16.47 OverviewASME B16.47 covers:Flanges: For nominal pipe sizes (NPS) 26 inches and larger.Types of Flanges: Weld Neck, Slip-On, Blind, Threaded, and Socket Weld.Types of Flanges CoveredWeld Neck FlangesDesigned to be welded to the pipe.Provides a gradual transition from the pipe to the flange, which helps in stress distribution.Suitable for high-pressure and high-temperature applications.Slip-On FlangesSlip over the pipe and then are welded both inside and outside.Easier to align and install.Used in lower-pressure applications.Blind FlangesUsed to close the end of a pipe or vessel.Provides a seal to contain pressure within the system.Threaded FlangesHave internal threads that match the external threads of the pipe.Used where welding is impractical.Socket Weld FlangesThe pipe is inserted into the flange and then welded around the socket.Suitable for high-pressure applications.DimensionsASME B16.47 defines dimensions for flanges in two series:Series A (MSS-SP-44)Series B (ASME B16.47)Key Dimensions:Nominal Pipe Size (NPS): 26 inches and larger.Bolt Circle Diameter (BCD): The diameter of the circle that the bolt holes are drilled into.Number of Bolts: Varies by flange size.Bolt Hole Diameter: The diameter of the holes used for bolts.Flange Thickness: Varies by NPS and pressure class.Raised Face (RF): The height of the raised face, if applicable.Pressure-Temperature RatingsASME B16.47 flanges are categorized by different pressure classes, similar to those in ASME B16.5. Common classes include:Class 150Class 300Class 600Class 900Class 1500Class 2500Each class has its own pressure-temperature ratings, indicating the maximum pressure the flange can handle at a specific temperature.MaterialsASME B16.47 specifies various materials for flanges, including:Carbon Steel: ASTM A105, ASTM A350 LF2Alloy Steel: ASTM A182 F5, F9, F11, F22Stainless Steel: ASTM A182 F304, F316, F316LDuplex and Super Duplex Stainless Steel: ASTM A182 F51, F53, F55Nickel Alloys: ASTM B564 (Inconel, Monel)Flange Face TypesASME B16.47 specifies different types of flange faces:Raised Face (RF)Flat Face (FF)Ring-Type Joint (RTJ)Each type has different characteristics suitable for various applications.Standard and Equivalent ReferencesASME B16.47: Flanges for nominal pipe sizes 26 inches and larger.MSS SP-44: Standard specification for steel pipe flanges.ISO 7005-1: Flanges and their joints - Part 1: Steel flanges.EN 1092-1: Flanges and their joints - Flanges - Part 1: Steel flanges.Summary of Key SpecificationsASME B16.47 Series A (MSS-SP-44):Flange Sizes: 26 inches to 60 inches.Pressure Classes: Class 150, 300, 600.Bolt Holes and Dimensions: Specific to each size and pressure class.ASME B16.47 Series B (ASME B16.47):Flange Sizes: 26 inches to 60 inches.Pressure Classes: Class 150, 300, 600, 900, 1500, 2500.Bolt Holes and Dimensions: Specific to each size and pressure class.ApplicationsASME B16.47 flanges are used in large-diameter piping systems where high pressure and temperature conditions are present. They are commonly found in:Petrochemical PlantsOil and Gas PipelinesRefineriesPower Generation FacilitiesAlways refer to the latest edition of ASME B16.47 and consult with suppliers or engineers to ensure compliance and proper selection of flanges for your specific application.