Butt welding flange: for flange and pipe welding, its structure is reasonable, the strength and rigidity are large, can withstand high temperature and high pressure and repeated bending and temperature fluctuation, the seal is reliable, the nominal pressure of 0.25 ~ 2.5MPa of the concave and convex sealing face of the flange. Butt welding flanges are suitable for pipelines with high temperature, high pressure and low temperature, which are used for high temperature, high pressure and low temperature. It is also used to transport expensive, flammable and explosive medium. The butt welding flange is not easy to deform, well sealed and widely used. The nominal pressure PN is about 16MPa. The butt size of the flange is changed with the nominal pressure, so that the flange plate of the equal diameter is often unable to dock. The actual work of order, manufacture, storage and transportation, installation, maintenance, maintenance and so on is very troublesome. The butt size of the 0.25, 0.6 MPa flange is used for the butt size of 1 MPa, and the thickness is still used in the original three specifications to realize the butt ruler. The simplicity of the inch.
The butt welding flange is used in the buried valve valve well where the cathodic protection is used for the transmission and distribution pipe network and the buried pipe valve with potential partition (zone) isolation. The partition (area) isolation of the welded flange for buried pipeline network can clearly grasp the cathodic protection of each piece (area). When the protective potential of the adjacent sheet (area) is different and the protective potential is not up to the patch (area), the special section (area) which is not up to the protection potential can be carried out. Until it meets the requirements, it runs again, and evaluates the cathodic protection partition (area) to deal with different cathodic protection conditions. When the protection potential is the same (or close) and the protection potential needs to be reached, a cross strip can be used to protect the flange of the flange.
