First, an introduction to large-diameter spiral steel pipes
The synthetic stress at the large-diameter spiral weld is 60-85% of the main stress of the straight seam welded pipe. Under the same working pressure, the wall thickness of the spiral welded pipe of the same diameter can be reduced compared to the straight seam welded pipe. According to the shape of the end, it is divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes. A certain passage should be left between the stacks of thick-walled spiral steel pipes. The width of the inspection channel is generally about 0.5m. The width of the access channel depends on the size of the material and the transportation machinery. Generally, the stacking height of the spiral steel pipe is 1.5 to 2m. The manual operation does not exceed 1.2m, the mechanical operation does not exceed 1.5m, and the stack width does not exceed 2.5m. According to the process regulations of submerged arc welding, each weld of the spiral steel pipe should have an arc starting point and an arc extinguishing point, but each straight seam welded pipe cannot meet this condition when welding the circumferential seam, so there may be more welding defects at the arc extinguishing point. Purpose Spiral steel pipe can create greater profits for people, and its development prospects will be very good because spiral steel pipe is a very environmentally friendly pipe and is very competitive among the pipes used.
Second, the use of large-diameter spiral steel pipes
Oil and gas transportation: used for long-distance transmission pipelines for oil, natural gas, and other media.
Urban pipeline network: widely used in municipal projects such as urban water supply, drainage, and gas.
Water conservancy projects: irrigation, drainage, and other systems in water conservancy projects.
Marine engineering: structural support and pipeline transportation of offshore platforms.
Industrial application: pipelines in industrial fields such as chemical industry and electric power.
Third, the production characteristics of large-diameter spiral steel pipes
Spiral forming: The pipe is spiral-shaped, and the strip steel is curled into a spiral shape during production, which is suitable for long-distance transportation.
Welding process: The double-sided submerged arc welding process is mostly used to ensure good weld quality and good welding performance.
Raw material adaptability: narrower strip steel can be used to produce large-diameter steel pipes, or wider strip steel can be used to produce multi-specification steel pipes, with high raw material utilization.
Fourth, the performance characteristics of large-diameter spiral steel pipes
High strength: It has high tensile strength and yield strength, and can withstand greater pressure and load.
Good toughness: Good toughness, can resist impact and vibration.
Corrosion resistance: After proper anti-corrosion treatment, it has good corrosion resistance and can adapt to different environmental conditions.
Excellent welding performance: It is suitable for various forms of welding, which is convenient for the installation and maintenance of pipelines.
Post time: May-14-2025