How To Remove Rust From Straight Seam Steel Pipes?

In the anti-corrosion construction of oil and natural gas pipelines, straight seam steel pipes are often used. The surface treatment of this kind of welded pipe is crucial to the anti-corrosion service life of the pipe, and is also one of the prerequisites to ensure that the anti-corrosion coating is closely combined with the straight seam steel pipe. According to data from professional research institutions, the service life of anti-corrosion coatings is affected by many factors, including coating type, coating quality and construction environment. The surface treatment of straight seam steel pipes plays a vital role in the service life of the anti-corrosion coating, accounting for about 50% of the overall service life.

Therefore, it is necessary to strictly follow the requirements for anti-corrosion coating on the surface of straight seam steel pipes and continuously improve the surface treatment methods of straight seam steel pipes to ensure long-term stable operation of the pipeline system and reduce maintenance costs. This series of measures aims to extend the service life of the pipeline system and improve its reliability to meet increasingly stringent engineering requirements. This article will detail how to remove rust from straight seam steel pipes.

The main methods for removing rust from straight seam steel pipes are as follows:

1. Cleaning

Use solvents and emulsions to clean steel surfaces to remove oil, grease, dust, lubricants and similar organic matter, but not rust or scale. These measures can only prevent the straight seam steel pipe from rusting, but they cannot remove the rust on the straight seam steel pipe.

2. Pickling

It is a method often used in the process of rust removal of straight seam steel pipes. In the actual anti-corrosion process of pipelines, some acidic chemicals are used to wash away the rust to achieve the purpose of rust removal. Pickling has many advantages, but it also has certain disadvantages. For example, it is easy to pollute the surrounding environment when pickling, and if chemicals are not used properly for pickling, not only cannot the rust be removed, but the straight seam steel pipe may also be damaged.

3. Rust removal tools

Mainly use tools such as wire brushes to polish the steel surface. It can remove loose oxide scale, rust, welding slag, etc., and rust removal with hand tools can reach Sa2 level. Power tool rust removal can reach Sa3 level. If the steel surface has a solid iron sheet. The tool rust removal effect is not ideal and cannot meet the standards required for anti-corrosion construction.

4. Spray rust removal

The high-power motor drives the spray blades to rotate at high speed, causing steel balls, steel sand, wire segments, minerals and other abrasives to be sprayed onto the surface of the straight seam steel pipe. The powerful centrifugal force of the motor. Not only can oxides, rust and dirt be completely removed, but the straight seam steel pipe can also achieve the required uniform roughness under the strong impact and friction of abrasives.

After spraying and rust removal, it can not only expand the physical adsorption effect on the pipe surface. It can also enhance the mechanical adhesion between the anti-corrosion layer and the pipe surface. Therefore, spray rust removal is an ideal rust removal method for pipeline anti-corrosion. Generally speaking, shot blasting is mainly used for the inner surface treatment of pipes, and shot blasting is mainly used for the outer surface treatment of straight seam steel pipes. Relevant technical indicators for rust removal should be strictly required during the production process. Prevent secondary damage to straight seam steel pipes caused by operational errors.

It is worth noting that the method of rust removal depends on the extent of the rust and the desired surface quality. Light rust can be removed using mechanical or chemical methods, while more severe rust may require more effort and professional help. Regardless of the method used, make sure you follow safety regulations when performing the work to avoid injury or environmental contamination.