As we all know, flanges can be divided into several categories, flanges have strong sealing, so those factors will affect his sealing, take large diameter flange for example, the following factors will affect the sealing of flange, follow the author to see
Tightness of large diameter flange
Affecting the sealing of the large diameter flange, it must be a gasket to improve the sealing performance of the flange, the appropriate preloading force, if increase the preloading force, will make the overall compression of the gasket, resulting in the loss of springback capacity of the flange gasket, even more extrusion or extrusion of the gasket, can be used to reduce the bolt, increase the number of bolts, Select suitable pretightening method to improve the tightness of flange
The gasket in the large diameter flange is to prevent the leakage of liquid, and the gasket is placed between the flanges and pressed to produce the sealing effect. The sealing surface of the large diameter flange is related to the nature and working conditions of the gasket and the consequences of leakage
The surface sealing surface is convenient to make, so that it can be put into the anti-corrosion inner surface. The width of the sealing surface is large, so the use of non-metallic or metal soft gaskets, one is the flange of the plane sealing surface, the other is the pressing surface with a convex, so it is called the concave and convex sealing surface, and the flange is called the convex flange.
In the middle of a pair of plane sealing surface width direction, one is made into a section such as tenon, the other section such as groove of the pressing surface pair, called the tenon sealing surface
The form of flange sealing surface will play an important factor in the sealing effect. The flatness Angle of flange sealing surface and the vertical Angle of sealing surface and flange center line will directly affect the force uniformity of gasket and the sealing performance of large diameter flange
Quality process of large diameter flange
Large flanges produced using different processes have their advantages and disadvantages, but this is not certain. For large diameter flanges made in the intermediate plate, it is critical to deal with the joint position. If this position is not welded properly, leakage will occur.
For the forged large diameter flange, the finished product leaves the factory, the flange will appear a layer of skin. If the bolt hole is located in the position of the skin, there will be water leakage when the pressure.
