Longitudinally Submerged Arc Welded Steel Pipe

Longitudinally Submerged Arc Welded Steel Pipe

LSAW (Longitudinally Submerged Arc Welded) Steel Pipes are large-diameter welded pipes designed for demanding structural and fluid transport applications. Available in outside diameters from Φ406mm to 1626mm (16″ to 64″), wall thicknesses ranging from 6mm to 75mm (1/4″ to 3″), and lengths between 3m to 12.5m (10′ to 41′), LSAW pipes offer exceptional strength, straightness, and weld integrity. These pipes are primarily used in oil & gas pipelines, structural foundations, and civil engineering.

Forming Methods and Types:

LSAW pipes are produced using different forming technologies including UOE, JCOE, and RBE methods. Each process delivers unique benefits in terms of pipe roundness, dimensional accuracy, and production efficiency. For example, UOE pipes are known for their high roundness and structural reliability, while JCOE pipes allow greater flexibility in pipe sizing and are widely used in offshore and onshore pipeline systems.

Standards and Grades:

Manufactured to comply with global standards such as API, ISO, EN, ASTM, DIN, BS, JIS, DNV, GB, CSA, and DEP, LSAW pipes meet stringent quality and safety requirements. Grade options include API 5L A to X100 and GB/T9711 L190 to L690, covering everything from low-grade transport to high-strength, high-pressure pipelines used in oil & gas transmission, waterworks, and long-distance energy infrastructure.

Applications and Use Cases:

Thanks to their heavy wall thickness and large diameter, LSAW pipes are widely used in pipeline construction, offshore platforms, bridge supports, foundation piling, and high-pressure fluid transportation. Their straight seam weld ensures a uniform structure, making them ideal for critical applications where strength and structural reliability are non-negotiable. They are particularly favored for long-distance transmission pipelines due to low risk of weld defects and excellent mechanical properties.

Advantages and Durability:

Longitudinally Submerged Arc welded pipes offer superior weld quality, consistent mechanical strength, and tight dimensional tolerances, enabling them to perform reliably under extreme environmental and operational conditions. With the ability to handle high internal and external pressure, they are ideal for deepwater and high-altitude pipeline projects. Enhanced by advanced non-destructive testing and coating options, LSAW steel pipes deliver long service life and minimal maintenance.