API 5L GRB SSAW Pipe For Oil Gas Liquid Convey & Structural
API 5L Grade B (GRB) SSAW (Spiral Submerged Arc Welded) Pipe is a versatile and cost-effective piping solution designed for large-diameter conveyance of oil, gas, and water, as well as high-load structural applications like piling and bridge support. With a minimum yield strength of 245 MPa (35,500 psi) and a tensile strength of 415 MPa (60,200 psi), these pipes are manufactured from hot-rolled steel coils that are spirally formed and joined using double-sided submerged arc welding, allowing for the production of diameters reaching up to 3048 mm (120 inches).
In fluid conveyance, they offer reliable performance for low-to-medium pressure systems, while in structural roles, the spiral weld seam provides enhanced hoop stiffness and resistance to buckling. Each pipe undergoes rigorous 100% X-ray and ultrasonic weld inspection alongside hydrostatic testing at pressures often exceeding 10-15 MPa (depending on wall thickness) to ensure leak-proof integrity across long-distance infrastructure.
Specification Table
| Item | Details |
| Standard | API Spec 5L (ISO 3183) |
| Grade | Grade B (L245) |
| Product Level | PSL1 (Standard) or PSL2 (High Performance) |
| Manufacturing Method | SSAW / HSAW (Helical Submerged Arc Welded) |
| Outer Diameter (OD) | 219 mm – 3048 mm (8" – 120") |
| Wall Thickness (WT) | 5.0 mm – 25.4 mm |
| Length | 6m, 12m, or custom up to 30m for structural piles |
| Ends | Plain End (PE) or Beveled End (BE) |
| Surface Treatment | Bare, Black Paint, 3LPE, FBE, or Cement Mortar Lining |
Chemical Composition (Mass Fraction %)
Note: Values represent the maximum allowable limits for Grade B.
| Product Level | C (max) | Mn (max) | P (max) | S (max) | Other |
| PSL1 | 0.28 | 1.20 | 0.030 | 0.030 | Cu, Ni, Cr, Mo (optional) |
| PSL2 | 0.24 | 1.20 | 0.025 | 0.015 | CEiiw ≤ 0.43 |
Mechanical Properties
| Property | Requirement (Metric) | Requirement (US Customary) |
| Yield Strength (min) | 245 MPa | 35,500 psi |
| Tensile Strength (min) | 415 MPa | 60,200 psi |
| Yield Ratio (max) | 0.93 (PSL2 only) | 0.93 (PSL2 only) |
| Elongation ( Af ) |
≥ 23% (approx.) |
Formula based on area |
| Impact Test (CVN) | Required for PSL2 only | Required for PSL2 only |
Manufacturing Process (SSAW)
Uncoiling & Leveling: The hot-rolled steel coil is unrolled and flattened.
Edge Milling: The edges of the steel strip are milled to ensure a high-quality weld profile.
Spiral Forming: The strip is fed into a forming machine that bends it into a spiral (helical) shape at a specific angle.
Submerged Arc Welding: Continuous double-sided welding is performed. The inner seam is welded first, followed by the outer seam using an electric arc under a layer of flux.
Cutting: The continuous pipe is cut into the required lengths using plasma or mechanical saws.
Quality Assurance (Testing Requirements)
To ensure the pipe is suitable for both high-pressure conveyance and structural weight-bearing:
Hydrostatic Testing: Every single pipe is filled with water and pressurized (per API 5L tables) to ensure no leakage or deformation.
X-Ray Inspection (RT): 100% X-ray of the weld seams (especially at the pipe ends) to detect internal defects like slag or porosity.
Ultrasonic Testing (UT): Automatic UT scan of the entire weld seam and the pipe body to detect laminations or weld flaws.
Dimensional Inspection: Strict checks on diameter, wall thickness, out-of-roundness, and weld bead height.
Guided Bend Test: Samples are bent to ensure the weld seam does not crack or separate from the parent metal.
Visual Inspection: Checking for surface imperfections and ensuring the spiral geometry is consistent.
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GNEE API 5L GRB SSAW Pipe for oil gas liquid convey & structural Factory
GNEE API 5L GRB SSAW Pipe for oil gas liquid convey & structural test equipments
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FAQ
What is the yield strength of API 5L Grade B?
The minimum yield strength of API 5L Grade B is:
245 MPa (Metric)
35,500 psi (US Customary)
For PSL2 pipes, there is also a maximum yield strength limit of 450 MPa (65,300 psi) to ensure the material remains ductile and weldable.
Will large-diameter SSAW pipes match properly during field welding (Fit-up)?
We strictly follow API 5L tolerances, keeping pipe end diameter deviations within ±1%.
For large-diameter or heavy-wall pipes, we offer Pipe End Expanding services. This process ensures the pipe mouth is perfectly circular, significantly improving field welding efficiency and alignment.
What anti-corrosion coatings do you provide for underground service?
We provide a comprehensive range of coating solutions:
External Coating: 3LPE (3-Layer Polyethylene) or FBE (Fusion Bonded Epoxy) are the industry standards for underground use, offering a lifespan of 30-50 years.
Internal Lining: Liquid Epoxy (for friction reduction/corrosion) or Cement Mortar Lining (primarily for water transmission).
Structural Use: Bare pipes, black vanish, or epoxy zinc-rich primers.
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