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Spiral steel pipes for subsea oil and gas trunk pipelines are spiral welded steel pipes designed specifically for deep-sea oil and gas resource transportation. They are manufactured using steel strip coils through 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 trunk transportation from subsea oil and gas fields to land or offshore platforms, meeting the strict requirements of deep-sea environments for pipeline salt spray corrosion resistance, high pressure resistance, and geological disaster resistance.
keyword Subsea oil and gas trunk pipeline steel pipe Category Scene photos Related products Get a quoteDefinition and core functions of spiral steel pipes for subsea oil and gas trunk pipelines
Spiral steel pipes for subsea oil and gas trunk pipelines are spiral welded steel pipes designed specifically for deep-sea oil and gas resource transportation. They are manufactured using steel strip coils through 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 trunk transportation from subsea oil and gas fields to land or offshore platforms, meeting the strict requirements of deep-sea environments for pipeline salt spray corrosion resistance, high pressure resistance, and geological disaster resistance. Its core function is to ensure the continuity and safety 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
High steel grade materials: X65/X70 steel grade materials (such as L485M) are used, which balance strength and toughness, and are suitable for deep-sea high-pressure and low-temperature environments.
Thick walled design: The wall thickness range is 8-32mm (such as φ 1520 × 32mm), which can withstand deep-sea high pressure (such as water pressure above 30MPa) and geological disaster impact.
2. Corrosion resistance and pressure bearing performance
Multi layer anti-corrosion technology: using 3PE anti-corrosion (epoxy powder+adhesive+polyethylene) or epoxy resin coating, with a salt spray corrosion resistance time of more than 30 years.
High pressure bearing capacity: Spiral welds disperse stress and have a 30% increase in impact resistance compared to straight seam pipes, with a maximum pressure bearing capacity of 2.5MPa (such as DN1200 with a wall thickness of 12mm).
3. Manufacturing process
Double sided submerged arc welding: using automatic double wire welding technology, the weld seam gap is controlled within 1-3mm, the inner and outer welds are 100% ultrasonic inspected and X-ray rechecked, and defects are automatically marked and repaired.
Intelligent detection: Each steel pipe undergoes a hydrostatic pressure test at 1.5 times the working pressure, and the data is automatically archived with a pass rate of ≥ 99.5%.
Application scenarios
Deep sea oil and gas trunk transportation
X65 steel grade spiral steel pipe is used for long-distance transportation from underwater oil and gas fields to land, withstanding high pressure and seawater corrosion, ensuring stable transportation of resources.
Cross sea pipeline engineering
Large diameter spiral steel pipes (such as DN3200) are used to connect offshore platforms with onshore pipelines, resisting seawater erosion and geological settlement.
Ocean platform connecting pipeline
Thick walled spiral steel pipes (wall thickness ≥ 20mm) are used as connecting pipelines between platforms, suitable for complex marine environments and high load conditions.
Production standards
The material complies with GB/T 9711 (Petroleum and Natural Gas Steel Pipe Standard) and API Spec 5L specifications, ensuring mechanical properties and corrosion resistance.
Implement SY/T 0413 (3PE anti-corrosion) or ISO 21809 (oil and gas pipeline coating standard) for anti-corrosion.
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