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Large flange use advantage

Large flange use advantage

2019-03-18 20:07

Large flange in the use of the process will produce different use value, with different types of efficiency and use. The material of large flange is different, and the production and processing process is different, so when using and processing large flange should pay special attention to the method, according to a certain process and method to use.


The common large flanges are flat welding large flange and butt welding large flange. Flat welding large flange rigidity is poor, suitable for pressure p≤4MPa occasions; Butt welding large flange, also known as high neck large flange, rigid, suitable for high pressure and temperature occasions. There are three types of large flange sealing surface: plane sealing surface, suitable for the pressure is not high, medium non-toxic occasions; Concave and convex sealing surface, suitable for occasions with slightly higher pressure; Tenon sealing surface, suitable for flammable, explosive, toxic medium and high pressure occasions. Large flanged pipe fittings with different properties have good product performance in different fields, which can produce different effects in different occasions and Spaces.


The gasket of large flange is a ring made of material which can produce plastic deformation and has certain strength. Most gaskets are cut from non-metallic plates, or made by professional factories according to the specified size, the materials are asbestos rubber board, asbestos board, polyethylene board, etc. Also useful thin metal plate (sheet iron, stainless steel) asbestos and other non-metallic materials wrapped up made of metal gasket; There is also a winding gasket made of thin steel belt wound together with asbestos belt.


Large flange in high pressure equipment and pipelines, using copper, aluminum, 10 steel, stainless steel made of lens or other shapes of metal gaskets. The contact width between the high-pressure gasket and the sealing surface of large flange is very narrow (line contact), and the processing smoothness of the sealing surface and gasket is high.


Large flange connection is mainly used for the connection of cast iron pipe, liner rubber pipe, non-ferrous metal pipe and large flange valve, and the connection of process equipment and large flange is also used for large flange connection.


The main characteristics of large flange connection are convenient disassembly, high strength and good sealing performance. When installing large flange, it is required that two large flanges should be kept parallel and the sealing surface of large flange should not be damaged and cleaned up. Gaskets for large flanges should be selected according to design requirements.


Large flange connection is an important connection way in pipeline construction.


Large flange can be threaded connection (wire connection) large flange and welding large flange. Low pressure small diameter wire connect large flange, high pressure and low pressure of large diameter used welding large flange, large flange thickness and different pressure connection bolt diameter and the number is different, according to the different levels of pressure, large flange gasket also have different material, from the low pressure asbestos pad, high-pressure asbestos pad to metal pads.