In the anti-corrosion construction process of oil and gas pipelines, the external treatment of straight seam steel pipe is one of the key factors determining the service life of pipeline anti-corrosion. It is the condition for the solid combination of anti-corrosion layer and straight seam steel pipe. After discussion and discussion by professional organizations, the life of the anti-
corrosion layer depends on the coating type, coating quality and construction environment. The appearance of the straight seam steel pipe affects the life of the anti-corrosion layer by about 50%. Therefore, it should be strictly followed. The standard of anti-corrosion layer meets the requirements of the appearance of straight-slit steel pipe, and continuously improves the external
surface treatment method of straight-slit steel pipe.
There are mainly the following methods for straight seam steel pipe removal:
1. Cleaning. Solvents and emulsions are used to clean the steel surface to remove oil, grease, dust, lubricants and similar organic matter, but it can not remove the rust, scale, flux, etc. of the steel surface, so it is only used as an auxiliary method in the defense operation.
2. Pickling. Generally, chemical cleaning and electrolysis are used for pickling treatment. Pipeline anti-corrosion is only used for chemical pickling, which can remove scale, rust and old coating, and can sometimes be used as re-treatment after sandblasting and rust removal. Although the chemical cleaning can make the appearance reach a certain cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the surrounding environment.
3. Tool rust removal. Firstly, the steel surface is polished with a wire brush and the like to remove loose scale, rust, welding slag, and the like. The rust removal of the hand tool can reach the Sa2 level, and the rust removal of the power tool can reach the Sa3 level. If the steel surface is attached with a strong iron oxide scale, the rust removal effect of the tool is not obvious, and the anchor depth required for anti-corrosion construction cannot be achieved.
4. Eruption and rust removal. Eruption and derusting is a high-speed motor that drives the eruption blade to rotate at a high speed, so that the steel ball, steel grit, wire segment, minerals and other abrasives can be sprayed on the surface of the straight-slit steel pipe under the strong centrifugal force of the motor, which can not only completely remove the oxide. , rust and dirt, and straight seam steel pipe under the effect of strong impact and friction of the abrasive, the desired uniform roughness can be achieved.
After eruption and derusting, not only can the physical adsorption effect of the outer surface of the tube be expanded, but also the mechanical adhesion of the anti-corrosion layer to the surface of the tube can be enhanced. Therefore, eruption and derusting is an aspirational descaling method for pipeline anticorrosion. In general, shot blasting is mainly used for the internal and external treatment of pipes. Shot blasting is mainly used for the treatment of straight seam steel pipes. In the production process, the rust-removing skill index should be strictly required to avoid the damage caused by the operation error to the straight seam steel pipe. The straight seam steel pipe will be more smooth than the embroidery before the embroidery, and the straight seam steel pipe will be removed. Embroidery is a commonly used skill in the steel pipe industry.
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