LSAW (Longitudinal Submerged Arc Welded) steel pipes are versatile products used for transporting various media, including onshore and offshore natural gas, shale gas, petroleum, petrochemicals, city gas, water, and slurry. They are also widely applied in structural engineering fields such as construction, bridges, offshore platforms, and power generation.
Product Specifications
- Diameter: Φ406.4mm – Φ1422mm (16″ – 56″)
- Wall Thickness: 6.3mm – 50.8mm
- Steel Grade:
- Line Pipe: L245/B to L690/X100
- Carbon Steel: Q235 to Q460, C60, C65, etc.
- Manufacturing Standards: GB/T 9711-2017, API SPEC 5L (46th Ed.), GB/T 3091-2015, SY/T 5037-2018, ASTM A671, ASTM A672, and other relevant domestic and international standards, or higher as per agreement.
Key Parameters (Based on API SPEC 5L, 46th Edition)
The following tables detail the standard manufacturing tolerances. We can meet stricter requirements upon negotiation.
1. Outer Diameter (OD) Tolerance
| Outer Diameter (D) | Location | Tolerance |
|---|---|---|
| 406mm ≤ D ≤ 610mm | Pipe End (within 100mm) | ±0.005D, max of ±1.6mm |
| Pipe Body | ±0.0075D, max of ±3.2mm | |
| 610mm < D ≤ 1422mm | Pipe End (within 100mm) | ±1.6mm |
| Pipe Body | ±0.005D, max of ±4.0mm |
2. Out-of-Roundness (Ovality) Tolerance
| Outer Diameter (D) | Location | Tolerance |
|---|---|---|
| 406mm ≤ D ≤ 610mm | Pipe End (within 100mm) | 0.015D |
| Pipe Body | 0.020D | |
| 610mm < D ≤ 1422mm | Pipe End (within 100mm) | 0.01D, max of 13mm |
| Pipe Body | 0.015D, max of 15mm |
3. Wall Thickness (WT) Tolerance
| Wall Thickness (t) | Tolerance |
|---|---|
| t > 5.0mm | ±0.1t, max of ±1.5mm |
4. Straightness Tolerance
- Overall Straightness: The total deviation from a straight line over the full length of the pipe shall be ≤ 0.2% of the pipe length.
- Local Straightness: The local deviation from a straight line within any 1.5m section at each pipe end shall be ≤ 3.2mm.
5. Length Range
- Standard Length: 8m to 12.5m.
Note: If customers have higher quality requirements, specific terms can be negotiated and agreed upon.