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　German standard flangeWhat is a flange?

For those engaged in mechanical or engineering installation, flanges should be very familiar. It is a disc-shaped part, usually used in pairs, so German standard flange: What is a flange?

german standard flange: flange is what?

1. The standard flange is mainly used for sealing of pipeline and valve, pipeline and pipeline, pipeline and equipment, etc. Because it is widely used between these equipment and pipelines, the two planes are bolted together, and the sealing part is called a flange.

2. The standard flange has a round hole for fixing. For example, when using flanges at pipe joints, add a sealing ring between the two flanges and tighten them with bolts. The flange thickness of different pressure is different, and the bolts used are also different. The main materials used for flanges are carbon steel, stainless steel and alloy steel. Because of its important role and good comprehensive performance, flange is widely used in chemical, petrochemical, fire protection, drainage and other industries.

3. Flange as a connector, is widely used in the world, which requires a unified standard. For example, there are two main standard systems for pipe flanges.

4., respectively, the European pipeline flange system, that is, the European pipeline flange system represented by German DIN (including Russia) and the American pipeline flange system represented by the American ANSI pipeline flange.

5. In addition, Japan has JIS pipe flange system and China has GB steel pipe flange system, but the main size is based on European and American systems.

6. The structure of the standard flange flange is relatively simple. It consists of upper and lower flange parts, middle gasket and several bolts and nuts.

7. From the definition of flange, we can know that there are many kinds of flanges, and their classification needs to be distinguished from different dimensions. For example, flanges can be divided into integral flanges, flat welded flanges, welded flanges, loose flanges and threaded flanges according to the connection mode. They are also common flanges. Integral flanges (IF) are generally used for high-pressure pipelines. It is a flange connection, and it is a long neck. Generally, it is a casting, and the materials used are generally carbon steel, stainless steel, etc.

8. Flat welding flange is also called tower welding flange, and the container or pipeline connection using welding. This kind of flat welding flange has the characteristics of convenient assembly and low price, and is mainly used in pipelines with low pressure and vibration.

9. Welding flange is also called high neck flange. The biggest difference between a welded flange and other flanges is that it has a prominent high neck. The wall thickness of the protruding neck will gradually be the same as the wall thickness and diameter of the pipe that will be docked with the height, which will increase the strength of the flange. Welding flange main 10. to be used for environmental changes, such as high temperature, high pressure, low temperature pipeline, all the metal will react with oxygen in the atmosphere, and then form a layer of oxide film on the surface. However, this oxide film has different properties in different metals. For example, the oxide film structure on the surface of ordinary carbon steel pipe fittings is very loose, and there is a large gap between rust and rust. There is no way to stop the further erosion of water and air, so the oxidation will continue to expand. Contrary to carbon steel pipe fittings, stainless steel pipe fittings can form a dense oxide film on the surface of stainless steel pipe fittings, which can block the progressive oxidation of water and air. This is also the reason why stainless steel has excellent oxidation resistance and corrosion resistance.