Distinguishing between LSAW and HSAW tubes

LSAW pipes and HSAW pipes are widely used in multinational pipeline projects in the oil and gas industries, but there are many differences between the two. Today, I will take you through an inventory.

1.Meaning Of LSAW And HSAW？

1.1 lsaw meaning

LSAW means longitudinal-seam submerged arc welding.The full name of LSAW steel pipe that people often refer to is Longitudinal Submerged Arc Welding Steel Pipe.

1.2 hsaw meaning

HSAW means helical submerged arc welding.Helical submerged arc welding (spiral) steel pipe is the full name of HSAW pipe.Actually, it's what people often refer to as SSAW steel pipes

1. LSAW stands for straight seam submerged arc welding and HSAW stands for spiral submerged arc welding. Both are used in the manufacture of steel pipes.

2. LSAW is formed by bending individual plates to form a U-shape and then welding the edges to form a longitudinal joint; HSAW is formed by wrapping steel strips to form a helix and then welding the edges to form a spiral joint.

3. Longitudinal submerged arc welded pipelines are suitable for transporting oil and gas, while spiral submerged arc pipelines are suitable for water transmission and structural applications, especially for large projects.

4. Tianjin Yuantai Derun Steel Pipe Manufacturing Group produces both LSAW and Spiral Submerged Arc Welded (SSAW) pipelines, which are widely used in international pipeline projects and are completed with low cost and high IRR.

5. LSAW pipes are made from plain sheet metal or thin plate and are longitudinally welded inside and out using the submerged arc welding process.

6. Spiral submerged arc welded pipes are made from spiral metal coils and are spiral welded using the submerged arc welding process.

7. Longitudinal submerged arc welded pipes are suitable for diameters from 16" to 60", while spiral submerged arc welded pipes are suitable for diameters over 140".

8. It is recommended that resistance welding be used for the manufacture of pipes less than 16 inches in diameter.

9. LSAW pipe costs more than HSAW pipe, but its longitudinal welds have better strength and can be physically inspected using radiographic testing, ultrasonic testing, hydrostatic testing and cosmetic inspection for quality assurance.

10. HSAW pipes cost less than LSAW pipes, but the length of their spiral welds can result in lower strength than LSAW pipes. Long spiral welds can also lead to defects such as pipe cracks and uneven weld buildup.

11. HSAW, LSAW and ERW pipelines are suitable for different types of pipeline projects, please consult our account manager for details.

FAQ

What is the full form of HSAW?

Helical submerged arc welding (spiral) steel pipe is the full name of HSAW pipe.

What is LSAW welding?

A special straight seam submerged arc welding technology used in pipeline production, which has undergone pre welding, internal welding, and external welding, and is suitable for steel pipe products with relatively large wall thickness. Most finished steel pipes can withstand high internal and external pressures.

What does HSAW stand for?

Helical Submerged Arc Welded.