What Are Differences Between LSAW Pipe and SSAW Pipe?

Both LSAW (straight seam submerged arc welded) pipe and SSAW (spiral submerged arc welded) pipe are widely used in the oil and gas industry. Careful program study is required when selecting the type of piping to complete the project on schedule. Today, we will take a closer look at the differences between LSAW and SSAW pipes.

LSAW:

Longitudinal submerged arc welded pipes are made of ordinary metal plates or sheets. The metal plate is first milled and then bent according to the required pipe diameter. The edge of the bent plate is processed with V-shaped grooves. The two open edges of the plate are welded internally and externally using the submerged arc welding process for longitudinal welds. LSAW pipe costs more than SSAW pipe because the sheet metal cost is higher than the coil cost.

For longitudinal submerged arc welded pipes, the larger the required pipe diameter, the larger the plate width required. However, the width and length of metal sheet manufacturing are limited, so only smaller diameter longitudinal submerged arc welded pipes can be manufactured. LSAW pipe sizes from 16 inches to 60 inches in diameter are recommended.

The longitudinal weld seam of straight seam submerged arc welded pipe has good strength.

The final product, whether it is LSAW or HSAW pipe, undergoes various quality assurance checks such as radiographic testing, ultrasonic testing, hydrostatic testing, and physical inspection for visual inspection.

HSAW:

HSAW tubes are made from spiral metal coils. Spiral coils are pieces of metal of small width but good length that are wound in the form of a coil.

There are many benefits to using spiral coils to create pipes. Spiral coils are cheaper than sheet metal. Therefore, SSAW pipes are less expensive to manufacture than LSAW pipes. Since there is no limit on the tube diameter, it can be used to manufacture larger diameter SSAW tubes.

The two opening edges of the plate are welded into spiral welds using a submerged arc welding process. The length of the weld is longer than the actual pipe length. This is why spiral welded HSAW pipes are less strong than LSAW pipes.

Typical Type Of Pipe Manufactured Is Listed Below: