Premium SSAW & SAWH Steel Pipe (Spiral Welded Pipe)
Our SSAW (Spiral Submerged Arc Welding) and SAWH (Submerged Arc Welded Helical) pipes are manufactured by helically forming hot-rolled steel strips and welding them using double-sided submerged arc welding. This spiral seam design provides excellent uniform strength and resistance to tearing, making it highly cost-effective for large-diameter requirements.
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Size Range: Outside Diameter (O.D.) from 8″ to 120″ (219.1mm – 3048mm) | Wall Thickness (W.T.) 5.0mm – 30.0mm.
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Maximum Length: Up to 30 meters (Customizable).
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Key Standards: API 5L, ASTM A53, EN 10219, EN 10217, AWWA C200, DIN 2458.
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Grades Available: API 5L Gr.B to X80, S235JRH to S355J2H, ASTM A53 Gr.A/B.
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Applications: Oil and gas transmission, water supply networks, sewage treatment, heavy-duty piling, and bridge construction.
Description
1. Product Overview & Applications
SSAW (Spiral Submerged Arc Welding) and SAWH (Submerged Arc Welded Helical) pipes are formed by rolling hot-rolled steel strip coils at a certain helical angle and welding the pipe seams together. The spiral welding seam allows for the production of large-diameter pipes from narrower steel plates.
Compared to LSAW (Longitudinal) pipes, SSAW pipes provide excellent uniform stress distribution. If a defect or crack occurs, the spiral weld acts as a natural barrier to prevent it from propagating rapidly along the length of the pipe. They are incredibly cost-effective for high-volume, large-diameter pipeline projects.
Primary Applications: Long-distance water transportation, petroleum and natural gas pipelines, chemical fluid transmission, piling (foundation pipes), port construction, and structural steelworks.
2. General Specifications & Material Grades
- Outside Diameter (O.D.): 219.1mm – 3048mm (8″ – 120″)
- Wall Thickness (W.T.): 5.0mm – 30.0mm
- Length: Standard lengths of 5.8m, 6m, 11.8m, 12m. Maximum up to 30m.
- Coating Options: Bare, Black Varnish, 3LPE, 3LPP, FBE, Epoxy Coal Tar, Cement Mortar Lined.
| Standard | Steel Grade |
|---|---|
| API 5L (PSL1 & PSL2) | Gr.B, X42, X46, X52, X56, X60, X65, X70, X80 |
| ASTM A53 | Gr.A, Gr.B |
| EN 10219 / EN 10210 | S235JRH, S275J0H, S275J2H, S355J0H, S355J2H |
| AWWA C200 | Water Transmission Steel Pipe Grades |
| JIS G3444 | STK400, STK500 |
3. Dimension & Specification Chart
Below is the detailed specification matrix for common SSAW pipe sizes, outer diameters, and applicable wall thicknesses.
| Nominal Pipe Size (NPS) | Outside Diameter (in) | Outside Diameter (mm) | Wall Thickness Range (mm) |
|---|---|---|---|
| 8″ | 8.625 | 219.1 | 5.0 – 12.0 |
| 10″ | 10.750 | 273.1 | 5.0 – 12.0 |
| 12″ | 12.750 | 323.9 | 5.0 – 14.0 |
| 16″ | 16.000 | 406.4 | 6.0 – 16.0 |
| 20″ | 20.000 | 508.0 | 6.0 – 18.0 |
| 24″ | 24.000 | 609.6 | 6.0 – 20.0 |
| 32″ | 32.000 | 812.8 | 8.0 – 22.0 |
| 40″ | 40.000 | 1016.0 | 8.0 – 25.0 |
| 48″ | 48.000 | 1219.2 | 10.0 – 25.0 |
| 60″ | 60.000 | 1524.0 | 10.0 – 28.0 |
| 80″ | 80.000 | 2032.0 | 12.0 – 30.0 |
| 120″ | 120.000 | 3048.0 | 14.0 – 30.0 |
4. Manufacturing Process Flow
Our SSAW pipes go through rigorous and continuous processing. The steel coils are flattened and edge-milled before being shaped into a spiral. The seams are then welded simultaneously from the inside and outside using the double submerged arc welding method to guarantee penetration and strength.
Raw Material Coil → Uncoiling → Flattening → Edge Milling → Helical Forming → Inner Submerged Arc Welding → Outer Submerged Arc Welding → Ultrasonic Testing (UT) → Cutting to length → X-Ray Inspection → Hydrostatic Testing → Pipe End Chamfering → Final Inspection → Marking → Coating & Packing.
5. Coating & Packaging
For large diameter pipes used in demanding environments, packaging and anti-corrosion protection are vital. We offer:
- End Finish: Plain ends, Beveled ends, equipped with plastic caps or steel rings.
- Internal/External Coating: Bare, Lightly oiled, Black/Red anti-corrosion painting, 3PE/3LPE coating, FBE (Fusion Bonded Epoxy), Epoxy Coal Tar, Cement Mortar lining for water pipelines.
- Packing: Shipped loose, with nylon slings and sufficient dunnage to avoid collision damage during sea transport.