Brief description and comparison of LSAW, SSAW and ERW pipes
LSAW pipes offer a slight advantage over SSAW pipes, and here's why.
SSAW pipes tend to have higher residual stresses compared to LSAW pipes. This is because the straight seam submerged arc welded pipe undergoes a more uniform expansion process, which helps reduce internal stress accumulation.
Another key difference lies in the welds of SSAW pipes. The stress concentration in their welds is considered more severe. Additionally, SSAW pipes have a larger heat-affected zone, which is a weak area that can be prone to failure under stress.
In terms of geometric accuracy, LSAW pipes are generally superior to SSAW pipes. This improved precision makes them easier to install, especially in complex or high-demand applications.
Furthermore, LSAW pipes typically have about 60% fewer welds than SSAW pipes. This not only reduces the chances of defects but also enhances the overall structural integrity of the pipe.
Overview and Comparison of LSAW, SSAW, and ERW Pipes
There are three main manufacturing processes for quality steel pipes: seamless, LSAW (Longitudinal Submerged Arc Welding), and ERW (Electric Resistance Welding). Both LSAW and ERW pipes are widely used due to their versatility and performance across various industries. They are commonly found in infrastructure projects, marine construction, civil engineering, hydraulic systems, petrochemical plants, chemical processing, power generation, agricultural irrigation, and urban development.
LSAW pipes come in two forms: longitudinal (which includes single or double straight-seam welds, known as DSAW) and helical (also referred to as SSAW, HSAW, or SAWL). Unlike other types, LSAW pipes feature both an inner and outer seam weld, while others may only have one weld on the exterior surface.
Both SSAW and LSAW pipes are produced using the JCOE or UOE forming process. The main difference lies in the welding direction—SSAW pipes are welded in a helical pattern, while LSAW pipes are welded in a straight line along the length of the pipe.
SSAW pipes are manufactured by winding and welding steel strips at an angle relative to the pipe axis, resulting in a spiral weld. In contrast, LSAW pipes are made by forming a flat steel plate into a cylindrical shape and then joining the edges with a straight-line weld.
LSAW pipes typically range in diameter from 16 inches to 60 inches (406 mm to 1500 mm) and are known for their excellent resistance to high pressure and low-temperature corrosion.
CSC Steel can provide pipes ranging from 1 inch to 167 inches (21 mm to 4267 mm) with thicknesses from 3/32 inch to 4 inches (2.1 mm to 100 mm). ESC steel pipes, produced using LSAW technology, are ideal for heavy-duty applications such as load-bearing piles and composite wall piles. In the oil and gas industry, large-diameter API 5L LSAW pipes are preferred for long-distance hydrocarbon transportation due to their reliability and strength.
SSAW pipes usually range in size from 20 inches to 100 inches (406 mm to 2540 mm). One of the benefits of SSAW is its flexibility in producing different diameters, making it suitable for a variety of applications.
ERW Pipes
ERW tubes are formed using a different method. Unlike SSAW pipes, which are made from continuous steel strips without cutting, ERW involves forming the steel into a tube and then welding the edges together through electric resistance. This process is efficient but can lead to longer weld seams, increasing the risk of defects like cracks, porosity, slag inclusions, and incomplete fusion.
HSAW (Spiral Submerged Arc Welding) or SSAW pipes are generally used in non-critical applications such as water distribution systems. They are not typically recommended for high-pressure or high-risk environments like oil and gas pipelines. However, CSC recommends SSAW pipes for use as main piles and dredging pipes in composite wall structures due to their cost-effectiveness and structural suitability.
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