LSAW (Submerged Arc Welded) pipes, also known as straight seam submerged arc welded steel pipes, are the preferred choice for large-diameter transportation systems due to their unique manufacturing process, excellent structural performance, and superior adaptability. They are used in demanding applications such as long-distance oil and gas transportation, municipal water supply, and marine engineering.
LSAW pipes use high-quality hot-rolled steel plates as raw materials, employing straight seam forming and submerged arc welding processes. During production, the material is first precisely cut using a CNC shearing machine, followed by multiple precision processes including pre-bending, forming, internal welding, and external welding. Compared to spiral welded pipes, LSAW pipes feature a straight seam, avoiding stress concentration caused by the angle of spiral welds. LSAW pipes exhibit greater structural stability under extreme conditions such as high pressure and low temperature. The submerged arc welding process effectively isolates the molten pool from air through the protective flux layer, ensuring a beautiful weld formation, fine grains, and consistent weld mechanical properties with the base material, fundamentally improving the overall load-bearing capacity of the pipeline.
The core competitiveness of LSAW pipes lies in their high strength and high flux resistance. Our LSAW products utilize pipeline steel of varying grades, allowing for customization of pipes with different wall thicknesses and diameters to meet diverse customer needs, covering a wide range of diameters.
They fully meet the requirements of high-pressure applications such as long-distance oil and gas pipelines and high-pressure water pipelines. Furthermore, through optimized weld arrangement and heat treatment processes, the pipelines exhibit enhanced impact toughness, maintaining excellent mechanical properties even in low-temperature environments, making them suitable for cold regions and deep-sea conditions.
LSAW pipelines' superior corrosion resistance ensures durability in complex environments. Our LSAW pipelines offer a variety of corrosion protection solutions for different applications: in oil and gas transportation, a 3PE anti-corrosion coating is used, employing a composite structure of an epoxy powder underlayer, an adhesive intermediate layer, and a polyethylene outer layer to achieve multiple layers of protection against corrosion, impact, and aging; in municipal water supply and drainage, a non-toxic epoxy coating prevents secondary water pollution; and in marine engineering, a combination of zinc coating and anti-corrosion paint effectively resists the strong corrosive effects of seawater. In addition, the inner wall of the pipe can be smoothed as needed to reduce fluid transport resistance, decrease energy consumption, and improve transport efficiency.
LSAW pipes have a wide range of applications and flexible customization capabilities, making them the top choice for many industries. In the energy sector, LSAW pipes are a core component of long-distance oil and gas pipelines, ensuring safe transport of oil and gas from oilfields to refineries thanks to their high strength. In municipal engineering, large-diameter LSAW pipes are used in urban main water supply and sewage treatment, offering significant advantages in corrosion resistance and high flow rates. In marine engineering, LSAW pipes can be used for transport pipelines on offshore oil and gas platforms and subsea oil pipelines, resisting seawater erosion and complex seabed stress. In the chemical industry, LSAW pipes are suitable for transporting various acid and alkali media and high-temperature fluids, exhibiting outstanding chemical stability. Our LSAW pipes can provide various connection methods such as threaded connections, flange connections, and welded connections, as well as customized lengths, wall thicknesses, and anti-corrosion treatment solutions to fully meet the needs of different industries.
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