Grade X70 PSL1 LSAW Welded Line Pipe
Grade X70 PSL1 LSAW Welded Line Pipe is a high-strength carbon steel pipe used primarily for transporting oil and gas under high pressure.
Unlike SSAW (Spiral) pipes, LSAW (Longitudinal Submerged Arc Welded) pipes are made by bending a single heavy steel plate into a cylinder and welding it along a single straight longitudinal seam. Grade X70 (also known as L485) indicates a minimum yield strength of 70,000 psi (485 MPa).
Grade X70 PSL1 LSAW Welded Line Pipe Specification
| Item | Details |
| Standard | API Spec 5L (ISO 3183) |
| Grade | X70 / L485 |
| Product Specification Level | PSL1 (Standard Quality) |
| Manufacturing Type | LSAW (Longitudinal Submerged Arc Welded) |
| Outer Diameter (OD) | 406.4 mm – 1422 mm (16" – 56") |
| Wall Thickness (WT) | 6.4 mm – 60 mm |
| Length | 6m - 12m (Single or Double Random Length) |
| Surface Coating | Bare, Black Paint, 3PE, FBE, Concrete Weighted |
Tests Referred for API 5L X70 PSL1 Pipe
ASTM A370: Mechanical testing of steel products.
ASTM E213: Ultrasonic testing of metal pipe.
ASTM E94: Standard guide for radiographic examination (X-Ray).
API RP 5L3: Drop-weight tear tests on line pipe (usually PSL2, but referenced).
Chemical Composition of API 5L X70 PSL1 (Max %)
Note: Chemical requirements for PSL1 are slightly more flexible than PSL2.
| Grade | C | Mn | P | S | Ti | V | Nb |
| X70 PSL1 | 0.26 | 1.65 | 0.030 | 0.030 | 0.04 | 0.09 | 0.05 |
Mechanical Property of API 5L X70 PSL1
| Property | Value |
| Yield Strength (Min) | 485 MPa (70,300 psi) |
| Tensile Strength (Min) | 570 MPa (82,700 psi) |
| Elongation (
AfAf ) |
Calculated based on cross-section area |
| Impact Test (CVN) | Not mandatory for PSL1 unless specified by purchaser |
API 5L X70 PSL1 LSAW Pipe Dimensions (Metric)
| NPS (Inch) | OD (mm) | Wall Thickness (mm) - Typical | Weight ( kg/m ) |
| 16" | 406.4 | 9.53 / 12.70 | 93.3 / 123.3 |
| 20" | 508.0 | 9.53 / 12.70 / 15.09 | 117.2 / 155.1 / 183.4 |
| 24" | 610.0 | 9.53 / 12.70 / 17.48 | 141.1 / 187.1 / 255.4 |
| 36" | 914.0 | 12.70 / 19.05 / 25.40 | 282.3 / 420.5 / 556.7 |
| 48" | 1219.0 | 15.88 / 22.23 / 31.75 | 471.2 / 656.1 / 929.3 |
X70 PSL1 LSAW Pipe Pressure Rating (Theoretical)
Calculated using Barlow's Formula with a 0.72 Design Factor.
| OD (inch) | Wall Thickness (mm) | Yield Pressure (PSI) | Working Pressure (approx. Bar) |
| 16" | 9.53 | 6,000 | 298 |
| 24" | 12.70 | 5,300 | 263 |
| 36" | 15.88 | 4,400 | 218 |
| 48" | 19.05 | 3,900 | 194 |
API 5L X70 PSL1 Line Pipe Dimensions in Inches
| NPS (Inch) | OD (Inches) | Schedule | Wall Thickness (Inches) |
| 16" | 16.000 | SCH STD | 0.375 |
| 18" | 18.000 | SCH STD | 0.375 |
| 20" | 20.000 | SCH XS | 0.500 |
| 24" | 24.000 | SCH 40 | 0.688 |
| 30" | 30.000 | - | 0.500 / 0.625 / 0.750 |
| 42" | 42.000 | - | 0.625 / 0.750 / 1.000 |
| 56" | 56.000 | - | 0.750 / 1.000 / 1.250 |
How to Choose API 5L X70 Pipe for Various Applications
For High-Pressure Transmission: X70 is ideal because its high yield strength allows for thinner walls, reducing the overall steel weight and transport costs.
For Large Diameter Needs: Choose LSAW for diameters over 24 inches where heavy wall thickness and high structural integrity are required.
PSL1 vs. PSL2:
Choose PSL1 for standard land-based water or low-pressure oil/gas lines.
Choose PSL2 (mandatory impact tests) for high-pressure gas mains, offshore applications, or cold climates.
For Corrosive Environments: If H2S (Sour Gas) is present, specify "Sour Service" requirements (PSL2 only).
Testing and Requirements for PSL1 X70 Pipe
Hydrostatic Testing: Every pipe must be tested for a minimum of 5 seconds to ensure no leakage.
Visual Inspection: Checking for surface defects like cracks, pits, or gouges.
Dimensional Inspection: Verifying OD, wall thickness, straightness, and ovality.
Weld Seam Testing: 100% Ultrasonic Testing (UT) or X-Ray (RT) of the longitudinal weld.
Guided Bend Test: To ensure the ductility and integrity of the weld.
Tensile Test: To verify the yield and tensile strength limits.
packaging and shipping
FAQ
What is LSAW pipe?
LSAW Pipe stands for Longitudinal Submerged Arc Welded pipe.
Here is a simple breakdown:
The "L" (Longitudinal): The pipe is made by welding a steel plate along a single straight seam running down the length of the pipe.
The Process: A single heavy steel plate is bent into a tube (using the JCOE or UOE process) and then welded using submerged arc technology.
Key Features: It is known for having thick walls, high pressure resistance, and high structural integrity.
Main Use: It is the preferred choice for critical, high-pressure oil and gas pipelines, especially those requiring large diameters and heavy wall thicknesses.
LSAW vs SSAW vs ERW-how do I choose?
| Feature | ERW | SSAW | LSAW |
| Diameter | Small/Med (up to 24") | Large (up to 120") | Large (up to 60") |
| Wall Thickness | Thin/Med | Medium | Very Thick |
| Weld Seam | Straight (Clean) | Spiral (Long) | Straight (High Integrity) |
| Safety/Pressure | Standard | Moderate | Highest |
| Price | $ (Cheap) | (Moderate) | $ (Expensive) |
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