Spiral Welded Pipe

Spiral welded pipe is produced by rolling low-carbon structural steel or low-alloy structural steel strips into pipe blanks at a certain angle (referred to as the forming angle) along the spiral line, and then welding the pipe seams together. It can be produced from narrower strips to manufacture large-diameter steel pipes.

Spiral pipes are mainly used for the transportation of oil and natural gas. Their specifications are indicated by the outer diameter and wall thickness. Spiral pipes can be single-sided or double-sided welded. The welded pipes should ensure that the water pressure test, weld tensile strength, and cold bending performance meet the requirements.

• Large-diameter production capacity: Spiral welded pipes can produce pipes with larger diameters (up to several meters), suitable for long-distance pipelines and large-scale engineering projects.
• High strength: The spiral welding process causes the weld seams of the pipes to be distributed in a spiral pattern, enhancing the overall strength and compressive resistance of the structure.
• Cost-effectiveness: The production process is efficient, with a high material utilization rate. Compared with seamless pipes and straight seam welded pipes, it has lower costs.

• Petroleum and natural gas transportation: suitable for long-distance and high-pressure pipeline transportation.
• For water supply and drainage: large-diameter pipes are suitable for large-scale water supply systems and drainage projects.
• In construction engineering: used for supporting structures such as pile foundations and bridges, with high strength and low cost.
• For industrial uses: applied in industrial facilities such as chemical plants and power plants, with good corrosion resistance.

• Coil probe: After entering the production line, the steel coils undergo full-plate ultrasonic testing.
• Leveling milling: The steel coils are leveled using an anvil leveler to restore their original curvature. Then, a steel coil milling machine mills both sides of the coil to achieve the required width and parallel groove shape along the edges.
• Cut type: Cutting is performed along the outer edge of the steel coil production line.
• Welding and cutting: Advanced technology is used for pre-double submerged arc welding of the steel pipes. Cutting begins from the bottom of the welding specification, and welding continues from the bottom of the welded pipes, and so on.
• Visual inspection: Basic parameters are checked by professional technicians.
• Ultrasonic flaw: 100% inspection of the inner and outer surfaces of the base material and the weld seams.
• X-ray detection: 100% X-ray inspection of the inner and outer surfaces of the weld seams is performed, using an image processing system to ensure detection sensitivity.
• Pressure test: A hydrostatic testing machine is used to conduct a root test on the steel pipes to ensure the test pressure meets the standard requirements.
• Chamfer level: Chamfer the pipe ends and inspect them. Process until the pipe end bevel dimensions meet the requirements.
• Check: Perform X-ray inspection on the pipe ends, followed by ultrasonic testing and magnetic particle testing to check for weld overlay problems and defects.
• Oiled marking: Apply oil for corrosion protection to qualified steel pipes and mark them according to user requirements.

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