Type of carbon steel flange sealing surface
There are three types of carbon steel flange sealing surface: plane sealing surface, suitable for low pressure and non-toxic media; concave and convex sealing surface, suitable for slightly higher pressure; mortise and groove sealing surface, suitable for flammable, explosive, toxic media and high pressure occasions. A gasket is a ring made of a material that produces plastic deformation and has a certain strength. Most gaskets are cut from non-metal plates, or made by professional factories in the specified size, consisting of asbestos rubber sheets, asbestos sheets, polyethylene plates, etc. Carbon steel flange split thread connection (wire) flange and welding flange and sleeve flange. Low pressure small diameter wire connection flange and sleeve flange, high pressure and low pressure large diameter are used by welding flanges, the thickness of different pressure of carbon steel flanges and the diameter and number of connecting bolts are different. Carbon steel flange flange connection can be divided into five types: flat welding, butt welding, penetration welding, loose sleeve, screw thread. The first three types are introduced in detail as follows: 1. Flat welding: only weld the outer layer, do not need to solder the inner layer. Generally used to connect medium and low pressure pipes with a nominal pressure of less than 2.5MPa. Carbon steel flange flat welding flange has three sealing surfaces, namely smooth type, concave and convex type and tenon and groove type, among which, smooth type is more widely used, has the characteristics of cheap, high cost performance.2. Docking welding: the inner and outer layer of carbon steel flange should be welded, generally used for medium and high pressure pipes, the nominal pressure of the pipe is between 0.25~2.5MPa, the sealing surface of carbon steel flange welding legal land connection is concave and convex, complex installation, labor costs, installation methods and auxiliary materials costs are high.3. Bearing welding: generally used for pipe connection with a diameter of less than or equal to 40 mm
