API 5L PSL1, API5L PSL2, ISO 3183 Line Pipe is a seamless or welded steel pipe specifically designed for transporting oil, natural gas, water, and other fluids, serving as a core material in the energy transportation sector. It is characterized by high strength, corrosion resistance, and high-pressure tolerance, and must comply with strict international standards (e.g., API 5L, GB/T 9711).
Primary Applications of Line Pipe
Oil & Gas Transportation
Long-distance pipelines: Projects like the West-East Gas Pipeline and China-Russia Gas Pipeline, operating under high pressure (typically 4–12 MPa).
Gathering networks: Medium-to-short-distance pipelines connecting oil/gas fields to processing facilities.
Chemical Media Transportation
Corrosion-resistant line pipes (e.g., L245N, X65 grades) are required for transporting corrosive fluids (e.g., acidic gases, liquid ammonia).
Urban Infrastructure
Water supply/heating pipes: Main pipelines in municipal projects, requiring pressure resistance and leak-proofing.
Drainage systems: Large-diameter welded pipes for rainwater and sewage discharge.
Special Environments
Subsea pipelines: Require seawater corrosion resistance (e.g., X70 grade with 3LPE coating).
Arctic pipelines: High-toughness materials (e.g., X80 grade) for temperatures below -40°C.
Key Properties of Line Pipe
| Property | Requirements |
|---|---|
| Strength | High-grade steel (e.g., X42–X100), with yield strength exceeding 690 MPa. |
| Corrosion Resistance | Internal coatings (epoxy resin), external anti-corrosion (3PE, FBE), or corrosion-resistant alloys (e.g., duplex stainless steel). |
| Weldability | Carbon equivalent (CE) must be controlled to prevent cracking during field welding. |
| Dimensional Accuracy | Strict tolerances for outer diameter/wall thickness (e.g., API 5L allows ±12.5% wall thickness tolerance). |
Material / Steel Grade:
PSL1:A/L210,B/L245,X42/L290,X46/L320,X52/L360,X56/L390,X60/L415,X65/L450,X70/L485
PSL2: L245N/Q,L290R/N/Q,L320N/Q,L360N/Q,L390N/Q,L415N/Q,L450N/Q,L485N/Q
Stainless Steel: TP304/L, TP316/L, S31803
Manufacturing Standards
API 5L PSL1, API5L PSL2, ISO 3183, GB/T9711, DNV-OS-F101, CSA Z245.1, KOC-MS-001, IPS-M-PI-190
ASTM A53/A106/A213/A269/A312 JIS G3454 DIN17175 EN10216
Size Range
