Types of Weld Neck Flanges

　　IF is used to represent the integral flange in various domestic standards. It is mostly used in pipes with high pressure. The production process is generally casting. In the type of flange, an IF is used to represent the type of integral flange. Generally, Weld neck flanges is a protruding surface (RF). If Weld neck flanges is used in flammable, explosive, high and extremely harmful working conditions, Weld neck flanges is possible to choose the form of convex concave surface (MFM) and tenon groove surface (TG) seals besides the RF surface.

　　Weld neck flanges is used in conjunction with valves, pumps and other equipment. When welded to the pipeline, its tail joint size is the same as the external diameter and wall thickness of the corresponding pipeline, it can be directly butt-welded. Standards and Classification of GOST 12821-80 PN6 RF Welded Neck Flange: Common Production Standards: Ministry of Chemical Industry Standard HG/T 20592-2009, HG/T 206115-2009, National Standard GB/T 9115.1-2000, GB/T 9115.2-2000, GB/T 9115.4-2000, Ministry of Machinery Standard JB/T 86.2-94, Marine Standard CB/T 47-1999 Weld neck flanges include many types and models. Weld neck flanges are used for butt welding of flanges and pipes, mainly in use. In welding technology, it has good use characteristics and performance, reasonable structure, high strength and stiffness. It needs to be determined according to the specific situation to ensure the specific use value and performance of welding flange and withstand high temperature and high pressure.