What is the difference between ERW and LSAW pipes?

ERW (Electric Resistance Welded) and LSAW (Longitudinal Submerged Arc Welded) are two different methods of manufacturing welded steel pipes. Here are the key differences between ERW and LSAW pipes:

Manufacturing Process:

ERW pipes: ERW pipes are manufactured by forming a flat strip of steel into a cylindrical shape and then welding the edges together using electric resistance.

LSAW pipes: LSAW pipes are manufactured by bending and shaping a steel plate or coil into a cylindrical shape. The longitudinal seam is then welded using a submerged arc welding process.

Seam Type:

ERW pipes: ERW pipes have a straight seam that runs along the pipe's length. The weld is typically high-frequency induced.

LSAW pipes: LSAW pipes have a longitudinal seam running along the pipe's length, which is formed by the submerged arc welding process.

Pipe Size and Thickness:

ERW pipes: ERW pipes are generally available in smaller diameters and thinner wall thicknesses. They are commonly used for low to medium-pressure applications.

LSAW pipes: LSAW pipes are suitable for larger diameters and thicker wall thicknesses. They are commonly used for high-pressure and large-scale applications such as oil and gas pipelines.

Production Efficiency:

ERW pipes: ERW pipes can be produced efficiently and are suitable for mass production due to their simpler manufacturing process.

LSAW pipes: LSAW pipes require more complex equipment and longer production time, making them more suitable for projects with specific requirements or larger sizes.

It's important to note that both ERW and LSAW pipes have their own advantages and applicability based on factors such as project requirements, cost considerations, pipe size, and intended use. The choice between the two methods depends on the specific needs of the application.