Large Diameter LSAW Welded Steel Pipe
Large Diameter LSAW (Longitudinal Submerged Arc Welded) steel pipes are manufactured by bending and welding wide steel plates. Known for high strength, excellent straightness, and uniform wall thickness, they are ideal for long-distance oil & gas pipelines, offshore structures, and piling applications.
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Description
Product Description
LSAW pipes are produced by pressing hot-rolled steel plates into a cylindrical shape, followed by internal and external submerged arc welding along a longitudinal seam. Compared to ERW and spiral pipes, LSAW pipes offer superior strength and are commonly used in high-pressure, high-temperature, or deep-water environments.
LSAW pipes meet global standards such as API 5L, ISO 3183, EN10219, and GB/T9711.
Specifications of large diameter pipe
| Item | Details |
|---|---|
| OD (Outer Diameter) | 406mm – 1820mm (16″ – 72″) |
| Wall Thickness | 6mm – 50mm |
| Length | 6m – 12.5m (customized available) |
| Steel Grade | API 5L Gr. B/X42/X52/X60/X70, Q235, Q345, L245-L485 |
| Standard | API 5L, ASTM A672, GB/T9711, EN10219 |
| Ends | Beveled, Plain, Flanged |
| Coatings | Bare, Black Paint, 3LPE, FBE, Galvanized |
| Welding Method | UOE, JCOE, DSAW (Double Submerged Arc Welding) |
| Density | ~7.85 g/cm³ |
Applications
Long-distance oil and gas pipelines
Urban water supply and drainage
High-pressure fluid transmission
Foundation piling and bridge columns
Structural supports in heavy infrastructure
Offshore oil platforms and marine piling
Key Advantages of large diameter welded steel pipe
Large diameter with thick wall capabilities
Superior strength for high-pressure or deepwater projects
Precise dimensional tolerance
Excellent weld quality and NDT-tested seams
Long pipe lengths reduce joint costs
Widely accepted by international pipeline projects
FAQ – LSAW Steel Pipe
Q1: What’s the difference between LSAW and SSAW pipes?
A: LSAW pipes have straight weld seams and higher dimensional accuracy, while SSAW pipes have spiral welds and are more cost-effective for low-pressure applications.
Q2: Is LSAW suitable for offshore platforms?
A: Yes, due to high strength, straightness, and weld integrity, LSAW is widely used in offshore piling and jacket structures.
Q3: What surface treatments are available?
A: We offer black painting, 3LPE, FBE, epoxy coal tar, and galvanizing.
Q4: Can you supply third-party inspection like SGS or BV?
A: Yes, all products can be tested by SGS, BV, TUV, or customer-appointed inspectors.
Q5: Do you offer MTC and EN10204 3.1 certificates?
A: Yes, all pipes come with mill test certificates and third-party documents on request.
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