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Various types of flanges are available, depending on construction. Flanges used in piping (orifice, threaded, slip-on, blind, weld neck, socket weld, lap-joint, and reducing) are available with a variety of facings, such as raised, flat, and ring-joint. Flange connections tend to be expensive because they require the precision forming of metal.
The ASME B16 Standardization of Valves Flanges, Fittings and Gaskets Committee, which operates under ASME’s Board on Pressure Technology Codes and Standards is responsible for standards covering valves, flanges, pipe fittings, gaskets and valve actuators for use in pressure services.
The face of the weld is the outer visual or hypotenuse that you see when looking at a fillet weld. The legs are the other two sides of the triangular fillet weld. The leg length is usually designated as the size of the weld. The throat of the weld is the distance from the center of the face to the root of the weld.
British Standard Pipe Parallel Thread Dimensions; British Standard Pipe Taper Thread Dimensions Archived 2017-09-27 at the Wayback Machine; BSP Thread Charts and Diagrams, showing dimensions of tubing and fittings; ISO 7-1:1994; ISO 7-2:2000; ISO 228-1:2000; ISO 228-2:1987; Parallel pipe threads G; Parallel pipe threads PF
Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing. A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.
Hexagon socket head cap screws (modified version of ISO 4762) Withdrawn: DIN EN ISO 4762, DIN EN ISO 21269: ISO 4762, ISO 21269: DIN 913: Hexagon socket set screws with flat point (ISO 4026 modified) Withdrawn: DIN EN ISO 4026: ISO 4026: DIN 914: Hexagon socket set screws with cone point (ISO 4027 modified) Withdrawn: DIN EN ISO 4027: ISO 4027 ...