Large-diameter welded pipes refer to welded steel pipes with a large diameter. Typically, their outer diameter is DN300 (300 mm) or larger, although some industry standards classify welded pipes with an outer diameter of DN600 or even larger as large-diameter welded pipes. Their main characteristics include large diameter, moderate wall thickness, robust structure, and the ability to withstand greater internal and external pressures, meeting the needs of special engineering projects.
The following are the main processes used to manufacture large-diameter welded pipes:
1. Straight seam welding: Steel strip is rolled into a pipe blank and then welded to form the pipe body. This process is suitable for larger diameter welded pipes and has high production efficiency.
2. Spiral welding: Steel strip is spirally wound at a certain angle to form the pipe body, and then welded. This method can produce pipes with larger dimensions and thicker walls, resulting in a more robust structure.
3. Submerged arc welding: A submerged arc welding machine is used during the pipe welding process to ensure weld quality and is suitable for high-pressure environments.
Large-diameter welded pipes Specification
Outer diameter range: 914mm to 1117mm
Wall thickness: ≥12.7mm standard thickness
Single pipe length: Typically 6-12 meters (fixed length)
Applications:
- Oil and Gas Pipelines: Large-diameter welded steel pipes are used in oil and gas transportation pipelines, offering high load-bearing capacity and meeting the requirements for long-distance transportation.
- Building Structures: Large-diameter welded steel pipes can be used in building support structures and bridge beams and columns, capable of withstanding significant weight and force.
- Marine Engineering: Large-diameter welded steel pipes are widely used in offshore platforms, docks, and ships, exhibiting excellent corrosion resistance.
- High-Pressure Vessels: Large-diameter welded steel pipes are commonly used in the manufacture of high-pressure vessels, such as boilers and pressure vessels.
Large-diameter welded pipes Factory
