Embroidery removal method of ERW steel pipe

In the process of anti-corrosion construction of oil and gas pipelines, the surface treatment of ERW steel pipe is one of the key factors to determine the service life of pipeline anti-corrosion. It is the premise of whether the anti-corrosion layer and ERW steel pipe can be firmly combined. After research by professional research institutions, the life of the anti-corrosion layer depends on factors such as the type of coating, coating quality and construction environment. The impact of the surface treatment of ERW steel pipe on the life of the anti-corrosion layer is about 50%. Standardize the requirements for the surface of ERAW steel pipes, and continuously improve the surface treatment methods of ERW steel pipes.

ERW steel pipe embroidery removal methods mainly include the following:

ERW steel pipe embroidery removal methods mainly include the following:

1. Cleaning: Use solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide scale, welding flux, etc. on the steel surface.
Therefore, it is only used as an auxiliary means in anti-corrosion operations.

2. Pickling: Generally, two methods of chemical and electrolytic pickling are used for pickling, and only chemical pickling is used for pipeline anticorrosion, which can remove oxide scale, rust, and old coating. Sometimes it can be used as reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to cause pollution to the surrounding environment.

3. Tool rust removal: mainly use tools such as wire brushes to polish the surface of the steel, which can remove loose oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is adhered to a firm scale of iron oxide, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.

4. Jet rust removal: Jet rust removal is driven by a high-power motor to drive the jet blades to rotate at a high speed, so that abrasives such as steel shot, steel sand, iron wire segments, and minerals are sprayed on the surface of the ERW steel pipe under the powerful centrifugal force of the motor.Not only can oxides, rust and dirt be completely removed, but ERW steel pipe can achieve the required uniform roughness under the action of abrasive impact and friction.

After spraying and removing rust, it can not only expand the physical adsorption on the surface of the pipe, but also enhance the mechanical adhesion between the anti-corrosion layer and the surface of the pipe. Therefore, jet rust removal is an ideal rust removal method for pipeline corrosion protection. Generally speaking, shot blasting is mainly used for inner surface treatment of pipes, and shot blasting is mainly used for outer surface treatment of ERW steel pipes. In the production process, the technical indicators related to rust removal should be strictly required to prevent the damage to the ERW steel pipe caused by operational errors. After the ERW steel pipe is removed, the appearance of the product will be smoother than before the removal

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