Brief description and comparison of LSAW, SSAW and ERW pipes
LSAW pipes offer a slight advantage over SSAW pipes, and the reasons are worth exploring. One key factor is that SSAW pipes tend to have higher residual stresses compared to LSAW pipes. This is because the straight seam submerged arc welded (SSAW) pipe undergoes a more uniform expansion process, which helps reduce stress concentration.
However, the welds in SSAW pipes are more prone to stress concentration, which is classified as a severe issue. Additionally, the heat-affected zone in SSAW pipes is larger than in LSAW pipes. Since the heat-affected zone is considered a weak point where failure can originate, this makes LSAW pipes more reliable in critical applications.
Another advantage of LSAW pipes is their superior geometric accuracy, which significantly eases the installation process. In comparison, SSAW pipes may be more challenging to align and fit properly during construction.
Moreover, LSAW pipes typically have about 60% fewer welds than SSAW pipes. This not only reduces the risk of defects but also enhances the structural integrity of the pipe.
When comparing LSAW, SSAW, and ERW pipes, it's important to understand how each is manufactured and where they are best applied. Quality steel pipes are produced through three main methods: seamless, LSAW (Longitudinal Submerged Arc Welding), and ERW (Electric Resistance Welding). Among these, LSAW and ERW are widely used due to their versatility and performance in various industries.
LSAW pipes come in two forms: longitudinal (single or double straight seam, known as DSAW) and helical (also called SSAW, HSAW, or SAWL). The main difference between LSAW and other types is that LSAW pipes have seams on both the inside and outside, while others only have an outer seam. This design provides additional strength and durability.
Both SSAW and LSAW pipes are made using the JCOE and UOE forming processes. The key distinction lies in the welding direction—SSAW pipes are welded in a helical pattern, while LSAW pipes use a straight-line welding method.
SSAW pipes are created by winding a steel strip and welding it at an angle relative to the pipe axis, resulting in a spiral weld. In contrast, LSAW pipes are formed by rolling a steel plate into a cylinder and then joining the edges with a straight weld.
LSAW pipes are commonly available in diameters ranging from 16 inches to 60 inches (406 mm to 1500 mm), and they are known for their excellent resistance to high pressure and low-temperature corrosion.
CSC Steel offers a wide range of pipe sizes, from 1 inch to 167 inches (21 mm to 4267 mm), with thicknesses ranging from 3/32 inch to 4 inches (2.1 mm to 100 mm). ESC steel pipes, manufactured using LSAW technology, are ideal for load-bearing piles, composite wall piles, and similar applications. In the oil and gas sector, large-diameter API 5L LSAW pipes are preferred for long-distance hydrocarbon transportation due to their reliability and efficiency.
HSAW or SSAW pipes typically range in diameter from 20 inches to 100 inches (406 mm to 2540 mm). One of their benefits is the ability to produce different diameters, making them suitable for a variety of projects.
ERW pipes, on the other hand, are made by forming steel plates into a cylindrical shape and then welding the edges using electric resistance. Unlike SSAW, which uses continuous steel strips, ERW pipes are often cut to length, which can lead to variations in quality.
While SSAW pipes are more cost-effective for certain applications, they are more susceptible to defects such as cracks, porosity, and incomplete welding. As a result, they are generally used in non-critical systems like water distribution rather than in high-risk environments like oil and gas pipelines.
CSC recommends SSAW pipes for use in main piles and dredging pipes for composite walls, highlighting their suitability for specific structural needs. Overall, the choice between LSAW, SSAW, and ERW depends on the application, budget, and required performance standards.
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