Spiral Welded Pipe and ERW Pipe

Spiral Welded Pipe vs. ERW Pipe
(1)Manufacturing process
A.ERW pipe manufacturing process:
Electric resistance welded (ERW) pipe is produced using a relatively simple but efficient manufacturing process. It starts with flat steel strip unrolled from a roll and passed through a series of rollers to ensure uniform thickness. The strip then enters the welding chamber, where high-frequency current is applied to the edges of the strip. This localized heating causes the edges to melt and fuse together, forming a continuous weld. Finally, the welded pipe is cut to the required length and subjected to various finishing processes such as straightening and inspection.

B. Spiral welded pipe manufacturing process:
Spiral welded pipe is made using a more complex manufacturing process called spiral welding. The flat steel strip is first fed into a machine equipped with forming rollers. As the strip advances through the machine, it develops into a spiral shape, with each turn overlapping the previous one. At the same time, the edges of the strip are welded together using submerged arc welding (SAW) or continuous welding techniques. This creates a seamless and strong weld that runs the length of the pipe.

Comparative analysis:
When comparing the manufacturing processes of ERW and spiral welded pipe, several factors come into play. First, the ERW process is simpler and requires fewer steps than spiral welding. This helps shorten the production time of ERW pipes and reduces manufacturing costs. Additionally, ERW pipes exhibit excellent dimensional accuracy and uniformity due to the precise control provided by the welding process.

Spiral welding, on the other hand, allows for the creation of pipes with larger diameters and thicker walls than ERW pipes. This makes spiral welded pipe ideal for applications requiring strong structural integrity and high-pressure sealing. In addition, the continuous weld seam in the spiral welded pipe increases resistance to bending and torsional stress, making it ideal for installation in challenging terrain.
(2) Pressure resistance
A.ERW pipe pressure resistance:
Electric resistance welded (ERW) pipe is known for its exceptional ability to withstand pressure. Seamless welds created during the manufacturing process ensure uniform strength and integrity along the entire length of the pipe. This makes ERW pipe suitable for applications that require reliable containment of high-pressure fluids, such as water distribution systems and oil and gas pipelines.

B. Spiral welded pipe pressure resistance:
Likewise, spiral welded pipe has impressive pressure resistance properties. Continuous welds running along the spiral shape of the pipe provide strong structural support and enhance its ability to withstand internal pressures. Spiral welded pipe is commonly used in applications where high-pressure containment is critical, such as underground drainage systems and industrial piping networks.

Comparative analysis:
When comparing the pressure resistance of ERW and spiral welded pipe, both types show commendable performance in high-pressure environments. Seamless welds in ERW pipe ensure consistent strength and reliability, while spiral welds in spiral welded pipe provide additional reinforcement to resist internal pressure.

However, it is worth noting that spiral welded pipe has certain advantages in certain situations. The spiral design distributes stress more evenly along the length of the pipe, reducing the risk of localized failure under extreme pressure conditions. In addition, compared to ERW pipes, spiral welded pipes can accommodate larger diameters and thicker walls, further enhancing their pressure resistance.
(3) Performance
A. Performance attributes of ERW steel pipes:
Dimensional accuracy
ERW pipes are known for their precise dimensional accuracy, thanks to the uniformity achieved during the manufacturing process. This ensures compatibility with accessories and reduces the need for adjustments during installation.