flange (flange) connection is the two pipes, fittings or equipment, first fixed in a flange flange, between the two flanges, plus flange pad, bolted together to complete the connection. Some pipe fittings and equipment have their own flanges, which are also flange connections. Flange connection is an important connection mode in pipeline construction.
High neck flange: compared with the butt welding flange, the welding workload is large, the welding rod consumption is high, can not withstand high temperature and high pressure and repeated bending and temperature fluctuations, but the field installation is more convenient, can omit the weld film detection process, and is more popular. 
Manufacturing standard: HG/T20615-2009, ASME B 16.5 Connection method: flange nut, bolt connection Production process: professional overall forging, forging manufacturing and other processing methods: high precision CNC lathe turning, ordinary lathe finishing, argon arc welding and other processing of High neck flange Applications: Boiler pressure vessel, petroleum, chemical industry, shipbuilding, pharmaceutical, metallurgy, machinery, stamping elbow food and other industries
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