Steel pipe inner wall coating process

There are two methods for coating the inner wall ofsteel pipe: one is the spray method and the other is the extrusion methodthe advantages of spraying method is: coating film adhesive relay good, uniform thickness, beautiful appearance, quality control intuitive, simpleMainly applicable to the internal wall of the new pipeline corrosion prevention, pipeline welding needs to complement the port to the pipeline welding port coatingextrusion method is the advantage: no excavation can be applied to the buried pipeline, applicable to the old pipeline non-excavation repair works, this construction method for those who have not yet equipped with the pipeline anti-corrosion repair car construction units are also the first choiceThe disadvantages of this method are:1, the control requirements of construction process parameters are very strict,2, the quality of pipeline welding is also very strict,3, coating quality control and detection is not intuitive