Advantages of using large flanges
2019-03-18
Large flange in the use of the process will produce different use value, with different types of efficacy and use. Large flange material is different, the production and processing technology is also different, so in the use and processing of large flange should pay special attention to the method, according to a certain process and method to use.
Large flange common overall large flange has flat welding large flange and large butt welding flange. The rigidity of flat welding large flange is poor, and the scope of application is the occasion of pressure p ≤ 4MPa. Butt welding large flange is also called high neck large flange, which is more rigid and suitable for occasions with higher pressure and temperature. There are three types of large flange sealing surface: planar sealing surface, suitable for occasions where the pressure is not high and the medium is non-toxic; concave-convex sealing surface, suitable for occasions with slightly higher pressure; tongue and groove sealing surface, suitable for flammable, Explosive, toxic media and occasions with high pressure. Large flanged pipe fittings of different nature have good product performance in different fields, and the effect will be different if they are adapted to different occasions and spaces.
The gasket of a large flange 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 according to specified sizes. Their materials are asbestos rubber plates, asbestos plates, polyethylene plates, etc. There are also metal-coated gaskets made by wrapping asbestos and other non-metallic materials with thin metal plates (white iron sheets, stainless steel). There is also a winding gasket made of thin steel strip and asbestos strip.
Large flanges in high-pressure equipment and pipelines, using copper, aluminum, 10 steel, stainless steel made of lens type or other shapes of metal gaskets. The contact width of the high pressure gasket and the sealing surface of the large flange is very narrow (line contact), and the processing finish of the sealing surface and the gasket is high.
Large flange connection is mainly used for the connection of cast iron pipe, rubber lining pipe, non-ferrous metal pipe and large flange valve, etc. The connection between process equipment and large flange also adopts large flange connection.
The main characteristics of large flange connection is easy to remove, high strength, good sealing performance, the installation of large flange requires two large flanges to keep parallel, large flange sealing surface can not be bruised, and to clean up. The gaskets used for large flanges shall be selected according to the design requirements.
Large flange connection is an important connection mode for pipeline construction.
Large flange threaded connection (wire joint) large flange and welding large flange. Low-pressure small-diameter wire-connected large flanges, high-pressure and low-pressure large-diameter are welded large flanges, the thickness of large flanges with different pressures and the diameter and number of connecting bolts are different, according to different levels of pressure, large flange pads also have different materials, from low-pressure asbestos pads, high-pressure asbestos pads to metal pads.
Key words:
Digger seat ring
Hengyue Forging
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