In the oil and gas pipeline anti-corrosion construction process, LSAW welded steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is LSAW welded steel pipe anti-corrosion layer, and whether the combination of a solid premise. The study of professional organizations, in addition to the life of the coating, depends on the type of coating, Coating quality, and construction of environmental factors, LSAW welded steel pipe coating surface treatment of life-span of about 50%, therefore, should be strictly in accordance with standard coating the surface of LSAW welded steel pipe requirements, continuous improvement straight seam steel surface treatment method, LSAW welded steel pipe is mainly the following methods in addition to embroidery categories:

1, solvent cleaning, emulsion cleaning 

The use of solvent cleaning, emulsion cleaning the steel surface, in order to achieve the removal of oil, grease, dust, lubricants, and similar organisms, but can not remove the steel surface rust, oxide, welding flux, etc., so the anti-government operations only as an adjunct.

2, pickling

Generally, two methods are used to do chemical and electrolytic pickling process, pipeline corrosion using only chemical etching, to remove oxidation, rust, old coatings, sometimes used as a sand-blasting after reprocessing. Although chemical cleaning can achieve certain surface cleanliness and roughness, the anchor pattern is light and easy to pollute the surrounding environment.

3, tools rust

Mainly using a wire brush and other tools on the polished steel surface can remove loose oxide, rust, welding slag. Hand tools rust can reach Sa2 grade power tools rust up Sa3 level, if attached to a solid steel surface oxide scale, tools rust is not satisfactory, Reach the construction requirements of corrosion depth of anchor pattern.

4, spray rust 

Spray rust by high-power high-speed rotating blade motor-driven spray, so that steel shot, grit, wire segments, minerals and other abrasive strong centrifugal force in the motor straight seam steel pipes under the surface of the spray treatment, not only You can completely remove oxides, rust and dirt and LSAW welded steel pipe in severe abrasive impact and the role of friction, but also to achieve the required uniform roughness. Spray rust, can not only expand the role of the physical adsorption tube surface, and can enhance the corrosion layer and the mechanical adhesion of the tube surface. 

Therefore, jet rust is the ideal way to pipe corrosion. Generally, shot peening rust inside the tube is mainly used for surface treatment, shot blasting straight seam steel pipes are mainly used for the outer surface treatment. stringent requirements of the production process to be rust-related technical specifications, to prevent operational errors result in the straight seam steel pipe to second injury, in addition to straight seam steel pipes through embroidery, embroidered products appearance and in addition, it will be more smooth than before, than straight seam steel pipes embroidered in the steel industry is a frequently used technique.