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Spiral steel pipes for onshore oil and gas trunk pipelines are spiral welded steel pipes designed specifically for long-distance oil and gas transportation. They are manufactured using steel strip coils, spiral forming, and double-sided submerged arc welding processes, and have high strength, corrosion resistance, high pressure resistance, and impact resistance. They are suitable for cross regional trunk transportation of crude oil, natural gas, and other media, meeting the strict requirements of pressure bearing capacity, sealing, and service time for onshore pipelines.
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Spiral steel pipes for onshore oil and gas trunk pipelines are spiral welded steel pipes designed specifically for long-distance oil and gas transportation. They are manufactured using steel strip coils, spiral forming, and double-sided submerged arc welding processes, and have high strength, corrosion resistance, high pressure resistance, and impact resistance. They are suitable for cross regional trunk transportation of crude oil, natural gas, and other media, meeting the strict requirements of pressure bearing capacity, sealing, and service time for onshore pipelines. Its core function is to ensure the safety and continuity of oil and gas transportation through spiral welding seam stress dispersion and multi-layer anti-corrosion technology.
Technical characteristics and manufacturing processes
1. Material and structural design
Raw materials: L485M (X70) high-grade steel or Q345B low-alloy steel is used, and the steel strip is pre treated with leveling and edge cutting to ensure mechanical properties and processing accuracy.
Specification range: The pipe diameter covers 219mm-3620mm, and the wall thickness is 8-32mm. For example, the 711 × 10.3mm spiral steel pipe can withstand a conveying pressure of over 1.6MPa.
2. Anti corrosion and pressure resistance performance
Multi layer anti-corrosion technology: using 3PE anti-corrosion (epoxy powder+adhesive+polyethylene) or epoxy resin coating, with a soil corrosion resistance time of more than 30 years.
Pressure bearing capacity: By dispersing stress through spiral welds, the impact resistance is increased by 30% compared to straight seam pipes, with a maximum pressure bearing capacity of 2.5MPa (such as DN1200 with a wall thickness of 12mm).
Production standards
The material complies with GB/T 9711 (Petroleum and Natural Gas Steel Pipe Standard) and API Spec 5L specifications.
Implement SY/T 0413 (3PE anti-corrosion) or ISO 21809 (oil and gas pipeline coating standard) for anti-corrosion.
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
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