Flat welding flanges are generally referred to as flat plates, or lap welding flanges. The connection between the flat welding flange and the pipeline is to insert the pipe into the inner hole of the flange to the proper position, and then lap welding.
Gasket is a ring made of a material that can produce plastic deformation and has a certain strength. Most of the gaskets are cut from non-metal plates, or made by professional factories according to the specified size. The materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc.; thin metal sheets (white iron, stainless steel) are also used to remove asbestos A metal-clad gasket made of non-metallic materials.
Flat welding flange also has a spiral wound gasket made of thin steel tape and asbestos tape. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120°C; asbestos rubber gaskets are suitable for occasions where the water vapor temperature is lower than 450°C, the oil temperature is lower than 350°C, and the pressure is lower than 5MPa. It is generally corrosive The most commonly used medium is acid-resistant asbestos board. In high-pressure equipment and pipelines, metal gaskets of lens type or other shapes made of copper, aluminum, 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 relatively high.