What Are the Different Types of Metal Flanges?

Flange, also known as flange flange or flange. The flange is a part that connects the shaft and the shaft, and is used for the connection between the pipe ends. The flange is also used on the equipment inlet and outlet for the connection between two equipment, such as the reducer flange. The flange connection or flange joint refers to a detachable connection in which a flange, a gasket and a bolt are connected to each other as a group of combined sealing structures. Pipe flange refers to the flange used for piping in pipeline installations, and used on equipment refers to the inlet and outlet flanges of equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flange is divided into threaded connection (thread connection) flange, welding flange and clip flange. The flanges are used in pairs. Wire flanges can be used for low-pressure pipelines, and welded flanges can be used for pressures above 4 kg. Add a gasket between the two flanges and tighten with bolts. Different pressure flanges have different thicknesses, and they use different bolts. When pumps and valves are connected to pipelines, parts of these equipment are also made into corresponding flange shapes, also known as flange connections. Any connection parts that are bolted at the periphery of two planes and closed at the same time are generally called "flange", such as the connection of ventilation ducts, this type of parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump. Relatively small ones, such as valves, can be called "flange parts". ^[1]

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Flange connection is to connect two pipes,

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(1) Reducing flange

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There are two main international pipe flange standards, namely the European pipe flange system represented by German DIN (including the former Soviet Union) and the American pipe flange system represented by American ANSI pipe flange. In addition, there are Japanese JIS pipe flanges, but they are generally only used for public works in petrochemical plants, and have a small international impact. The pipe flanges of various countries are introduced below:

1.European system pipe flanges represented by Germany and the former Soviet Union

2. American system pipe flange standards, represented by ANSI B16.5 and ANSI B 16.47

3. British and French pipe flange standards. Each country has two bushing flange standards.

In summary, the internationally accepted standard for pipe flanges can be summarized as two different and non-interchangeable pipe flange systems: one is the European pipe flange system represented by Germany; the other is the United States. American tube flange system.

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The production process is mainly divided into

In the continuous production of modern industry, flanges are affected by media corrosion, erosion, temperature, pressure, vibration and other factors, and leakage problems will inevitably occur. Due to the error in the dimensions of the sealing surface, the aging of the sealing elements and improper installation and tightening can easily cause leakage of the flange. If the flange leakage problem cannot be treated in time, the leakage will rapidly expand under the erosion of the medium, resulting in the loss of materials and the destruction of the production environment, leading to the shutdown of the enterprise and the huge economic loss. If it is a toxic and harmful, flammable and explosive medium leaking, it may also cause major accidents such as poisoning of personnel, fire and explosion.

The traditional method of solving flange leakage is to replace sealing elements and apply sealant or replace flanges and pipes, but this method has great limitations, and some leakages are limited by the safety requirements of the working environment and cannot be solved on site. . Can now be used

Because the flange has good comprehensive performance, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, power, aerospace, shipbuilding and other basic projects.