Large flange in the process of use will have different values of use, and produce different types of functions and uses, large flange of different materials, production, and processing technology is also different. So in the use of processing large flanges should pay special attention to the method, to be used in accordance with certain procedures and methods.
Ordinary integral large flanges have flat welded large flanges and butt-welded large flanges, flat welded large flanges with poor rigidity, applicable to pressure p ≤ 4MPa occasions, butt-welded large flanges, also known as high-neck large flanges with high rigidity, applicable to high-pressure and high-temperature occasions, there are three types of sealing surfaces for large flanges: flat sealing surfaces, suitable for low-pressure and medium-pressure occasions. Convex sealing surface, suitable for slightly higher pressure occasions, tongue and groove sealing surface, suitable for flammable, explosive, toxic medium and high-pressure occasions, different performance of large flange fittings, in different fields, have good product performance, in different occasions and space effect will be different.
A Large flange gasket is a kind of ring that can produce plastic deformation and has a certain strength, most of the gaskets are non-metallic sheet cut or made by specialized factories by the specified dimensions. Materials include asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc. There are also non-metallic materials such as asbestos wrapped in thin metal sheets (tin, stainless steel) made of metal-clad gaskets, as well as thin steel and asbestos belts made of wound gaskets, for high-pressure equipment and pipelines in the large-scale flange, the use of lens-type or other shapes of metal gaskets made of copper, aluminum, No. 10 steel and stainless steel, high-pressure gaskets and large-scale flange sealing surface The contact width is very narrow (line contact), and the sealing surface and gasket are processed with a high degree of finish.
Its connection is mainly used for the connection of cast iron pipes, rubber-lined pipes, non-ferrous metal pipes, large flange valves, etc. A Large flange connection is also used for the connection between process equipment and large flanges, the main features of a large flange connection are easy to dismantle, high strength, and good sealing performance. When installing large flanges, the two large flanges should be kept parallel, the sealing surface should not be rubbed and cleaned, and the gasket used for the large flanges should be selected according to the design regulations.
It connection is an important connection in pipeline construction, They are divided into threaded connection (threaded connection) large flanges and welded large flanges, there are low-pressure small-diameter threaded connection large flanges, high-pressure, low-pressure, large-diameter are used to weld large flanges. The thickness of large flanges with different pressures and the diameters and numbers of connecting bolts are different. According to the different pressure levels, large flange gaskets are also made of different materials, from low-pressure asbestos gaskets, and high-pressure asbestos gaskets to metal gaskets.
