The main function of the flange: the flange is a ring made of a material that can produce plastic deformation and has a certain strength. Most flanges are cut from non-metallic plates, or manufactured by professional factories according to specified dimensions. These materials include asbestos rubber sheets, asbestos sheets, PTFE sheets, polyethylene sheets, etc., and flanges made of non-metallic materials such as asbestos wrapped with thin metal sheets (white iron, stainless steel)

Low pressure and small diameter wire flanges, high pressure and low pressure large diameter wires use welding flanges. The thickness of the flange, the diameter and the number of connecting bolts vary with pressure.

Common integral flanges for large flanges include flat welding flanges and butt welding flanges. The flat welding flange has poor rigidity and is suitable for occasions with pressure p≤4MPa. Butt-welded flanges are also called high-neck flanges, which have high rigidity and are suitable for occasions with high flange pressure and temperature.

There are three types of flange sealing surfaces: flat sealing surface, suitable for occasions where the pressure is not high and the medium is non-toxic; concave-convex sealing surface, suitable for occasions with slightly higher pressure; tongue and groove sealing surface; suitable for flammable and explosive products, for toxic For medium and high pressure occasions, flange pipe fittings with different properties have good product performance in different fields, and different applications and spaces will produce different effects.

Cut the large flange and the intermediate plate into slats, and then roll them into a circle. Then treat water pipes, bolt holes, etc. Usually this is a large flange with a maximum length of 7 meters. This type of flange has good quality assurance because the raw material is a medium-density plate, and the material is carbon steel, stainless steel, alloy steel, etc.

In the machinery industry, the flanges (or reinforcement rings) used by many manufacturers are only used for connection or support. It is said that steel strip (flat steel) can be directly rolled into the required flange equipment. This processing method saves labor and materials and greatly saves costs.

In recent years, more and more accidents have occurred on the flange, causing great harm to humans. Let us take a look at what harm the flange brings to our lives.

Leakage during natural gas transportation has always been a problem that plagues engineers. There are many such accidents in China. The leakage of natural gas will cause frequent accidents. However, the leakage of natural gas is mainly due to the leakage of flange joints. Solving this problem is directly related to the important content of safe production.

There are many leakage factors at the flange connection, for example, pipeline perforation leakage caused by electrochemical corrosion of buried steel pipes, leakage caused by rupture of pipeline welding parts, and so on. In the urban gas transmission and distribution system, the main form of detachable connection of equipment and pipelines is flange connection, especially in storage and distribution stations, pressure regulating facilities, valve wells, metering rooms, etc., which use numerous flange connections.