What are the advantages of SAE flange compared with ordinary welded flange

Update:10-07-2020
Summary:

High-pressure flange (sae flange): also called flange o […]

High-pressure flange (sae flange): also called flange or flange.

 

The parts that connect the pipe to the pipe are connected to the pipe end. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flanged pipe fittings (flangedpipefittings) refer to pipe fittings with flanges (flanges or flanges). It can be made by casting (the picture is temporarily missing), or it can be formed by screw connection or welding.

SAE code 61 2-screw bolt Flange Clamps connections

The flange connection (flange, joint) consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the surface of the gasket reaches a certain value and then deforms, and fills the unevenness on the sealing surface, making the connection tight and leak-proof. Flange connection is a detachable connection. According to the connected parts, it can be divided into container flange and pipe flange. According to the structure type, there are integral flange, loose flange and threaded flange. Common integral flanges include flat welded flanges and butt welded flanges. Flat welded flanges have poor rigidity and are suitable for occasions with pressure p≤4MPa; butt welded flanges, also known as high neck flanges, have high rigidity and are suitable for occasions with high pressure and temperature.

 

There are three types of flange sealing surface: flat sealing surface, suitable for occasions with low pressure and non-toxic medium; concave and convex sealing surface, suitable for occasions with slightly higher pressure; tenon groove sealing surface, suitable for flammable and explosive , Toxic media and high pressure occasions. A gasket is a ring made of a material that can produce plastic deformation and has a certain strength. Most gaskets are cut from non-metallic plates, or made by professional factories in accordance with the prescribed size, and the materials are asbestos rubber plates, asbestos plates, polyethylene plates, etc.; asbestos can also be made of thin metal plates (tinplate, stainless steel) A metal-clad gasket made of non-metallic materials; there is also a wound gasket made of thin steel tape and asbestos tape. Ordinary rubber gaskets are suitable for occasions where the temperature is below 120°C; asbestos rubber gaskets are suitable for occasions where the water vapor temperature is below 450°C, the oil temperature is below 350°C, and the pressure is below 5MPa, for general corrosion The medium, the most commonly used is acid-resistant asbestos board. In high-pressure equipment and pipelines, metal gaskets of lens type or other shapes made of copper, aluminum, No. 10 steel, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is high.

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