Coating process of inner wall of steel pipe

There are two coating methods for the inner wall of steel pipe: one is spraying method, the other is extrusion coating method The advantages of spraying method are: good adhesion, uniform thickness, beautiful appearance, intuitive quality control and simple It is mainly applicable to the anti-corrosion of the inner wall of newly-built pipelines When welding pipelines, it is necessary to use a joint patching machine to repair the welding joints of pipelines The advantages of the squeeze coating method are that the buried pipeline can be internally coated without excavation, which is suitable for the trenchless repair project of the old pipeline This construction method is also the first choice for those construction units that have not yet equipped with the anti-corrosion joint car in the pipeline The disadvantages of this method are: 1 The control requirements of construction process parameters are very strict; 2 The requirements of pipeline welding quality are also very strict; 3 The quality control and inspection of coating are not intuitive