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Spiral steel pipes for long-distance natural gas transmission pipelines are a type of steel pipe designed specifically for long-distance transportation of natural gas. They are made of low-carbon steel or low-alloy steel strips and manufactured through spiral forming and double-sided submerged arc welding processes. They have high strength, corrosion resistance, and sealing properties, and are suitable for long-distance transportation of high-pressure and high flow natural gas.
keyword Natural gas transmission long-distance pipeline steel pipe Category Scene photos Related products Get a quoteDefinition and standard of spiral steel pipe for long-distance natural gas transmission pipeline
Spiral steel pipes for long-distance natural gas transmission pipelines are a type of steel pipe designed specifically for long-distance transportation of natural gas. They are made of low-carbon steel or low-alloy steel strips and manufactured through spiral forming and double-sided submerged arc welding processes. They have high strength, corrosion resistance, and sealing properties, and are suitable for long-distance transportation of high-pressure and high flow natural gas. Its core standard is GB/T 9711 (Steel Pipe for Petroleum and Natural Gas Industry Transportation), covering steel grades L175-L555, suitable for combustible fluid transportation scenarios.
Core Features and Technical Requirements
1. Materials and Manufacturing Processes
Raw material selection: Low carbon steel (such as Q235B) or low alloy steel (X60M and above). The strip steel needs to undergo pre-treatment such as leveling, trimming, and planing to ensure surface quality and dimensional accuracy.
Forming and Welding: External/internal control roll forming technology is used to roll the pipe blank, with a weld gap controlled between 1-3mm. Internal and external double-sided submerged arc welding (such as Lincoln welding machine in the United States) is used to ensure welding strength and sealing.
2. Anti corrosion treatment
Multi layer anti-corrosion technology: For corrosive media such as natural gas containing hydrogen sulfide, 3PE anti-corrosion process (epoxy powder+adhesive+polyethylene) or FBE (fusion bonded epoxy powder coating) is adopted to significantly improve the corrosion resistance performance.
Surface treatment: Sandblasting rust removal, acid cleaning to ensure coating adhesion, extending pipeline life to more than 30 years.
3. Performance advantages
High pressure bearing capacity: The wall thickness range is 8-25mm (thicker can be customized), and the pressure bearing capacity can reach 10-20MPa, meeting the high pressure requirements of long-distance pipelines.
Terrain adaptability: Spiral welds disperse stress, can be bent and laid, and adapt to complex terrains such as mountains and swamps.
Economy: Producing large-diameter pipes (such as DN2500) with narrow strip steel reduces material costs by 20% and has low maintenance costs.
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