Anti-corrosion spiral steel pipe is to carry out anti-corrosion treatment on spiral steel pipe. The main anti-corrosion method is polyurethane anti-corrosion spiral pipe. After preliminary treatment such as rust removal, the steel pipe is first put on a polyethylene jacket. The thickness is determined according to the customer’s needs. Foam is filled between the pipe body and the polyethylene skin, and the thickness of the foam is also processed according to customer needs.
The installation of anti-corrosion spiral steel pipes can be either overhead or buried. Anti-corrosion spiral steel pipe toughness: The so-called toughness refers to the ability of metal materials to not be damaged under the action of impact force (dynamic load). Resistance includes impact toughness and impact absorption energy index. Impact toughness of anti-corrosion spiral steel pipe: Impact toughness is a mechanical performance index used to evaluate the impact resistance of metal materials under dynamic loads.
Generally, the high-energy primary impact value (αKU or αKV) is used as the standard. It uses standard specimens of size and shape to conduct experiments on a pendulum-type primary impact testing machine. Experimental results, impact absorption energy of anti-corrosion spiral steel pipe: due to the size of αK value. It not only depends on the material itself but also changes with changes in sample size, shape, and experimental temperature, so the αK value is only a relative indicator.
The main straight pipe of the anti-corrosion spiral steel pipe is prefabricated with an anti-corrosion layer in the factory, and a patching section is reserved, and then welded on site, and then patched with a heat shrink sleeve or heat shrink tape. As for the bent pipe part, the most commonly used process now is using heat-shrinkable wrapping tape to make anti-corrosion spiral steel pipes of the same grade. However, the disadvantage of this anti-corrosion process is that it cannot be constructed in a mechanized assembly line and can only be wrapped manually, which is time-consuming and has high material costs.
Thick-walled spiral steel pipe refers to a spiral steel pipe whose wall thickness is slightly thicker than that of ordinary spiral steel pipes. The advantages of spiral steel pipes with ordinary wall thickness are high compressive strength, high impact strength, high performance, and long service life. The implementation standards include 5037, 9711, and the double-sided submerged arc welding manufacturing process used for thick-walled spiral steel pipe forming processes before spiral steel pipe forming.
Welding can be completed in the best position, and defects such as wrong edges, welding deviations, and incomplete welding are not prone to occur, and the welding quality and position can be easily controlled. The spiral steel pipe adopts a special welding process, which can be welded in the best welding position without any errors and defects, ensuring the qualification and quality of the spiral steel pipe. During the forming process of spiral steel pipe, the steel plate must be deformed evenly.
The residual stress is small and the surface should not be scratched. Therefore, the steel plate for manufacturing spiral steel pipes should be carefully selected and the surface should be uniform without scratches. The processed spiral steel pipe has great flexibility in the standard range of diameter and wall thickness. Especially in the production of high-grade thick-walled pipes, especially small and medium-diameter thick-walled pipes, it has advantages that other processes cannot match and can satisfy users. There are many requirements in spiral steel pipe standards.
The diameter and standard range of spiral steel pipes must be flexibly controlled. Taking advantage of its outstanding advantages, spiral steel pipes can popularize and promote the development direction of thick-walled spiral steel pipes. With the development of industry, engineering has put forward higher requirements for the use of spiral pipes. The reason why thick-walled spiral pipes appear is because some media that need to be transported generate pressure that ordinary spiral steel pipes cannot withstand.
If we switch to straight seam steel pipes or seamless steel pipes, it will greatly increase the cost of the project. If it is a hazardous medium, we will inevitably increase the cost. Therefore, when choosing a pipeline, it is based on the medium transported by the project and the medium will be transported. The pressure that occurs determines.
If the project is interrupted during the laying of large-diameter spiral steel pipe installations, the pipe end should be sealed to prevent debris from flowing into the pipe. Before pressure testing, the center of each pipe should be covered with soil. Use small wooden blocks to stabilize the laid pipe body to avoid displacement when connecting the curved section of the pipe.
Post time: Mar-21-2024