Spiral Welded Pipes (SSAW / LSAW)

• Spiral Submerged Arc Welded (SSAW) or Spiral Welded (SAWH) pipes are widely used in industries such as oil and gas, water supply, and construction due to their excellent strength, efficiency, and cost-effectiveness. One of the most notable advantages of SSAW/SAWH pipes is their high strength and ability to withstand pressure. Because of their spiral welding process, where the steel strip is coiled and welded along a spiral seam, these pipes can handle higher internal and external pressures compared to many other welded pipes. The continuous spiral weld provides uniform strength along the entire length of the pipe, making it ideal for large-diameter and long-distance pipeline projects.

  
  

• Another major benefit is their flexibility in size and length. SSAW/SAWH pipes can be manufactured in a wide range of diameters and wall thicknesses without the limitations faced by straight-seam welded pipes. This flexibility makes them suitable for applications such as oil and gas transportation, water mains, and piling foundations. The spiral welding method also allows for the production of long pipes without the need for frequent joints, reducing potential leakage points and improving overall reliability in fluid transportation systems.

  
  

• In addition to their structural advantages, SSAW/SAWH pipes offer excellent cost efficiency and production economy. The manufacturing process uses hot-rolled steel coils, which are more readily available and less expensive than steel plates used for other types of pipes. The spiral forming technique also results in minimal material waste and allows for continuous production, making SSAW/SAWH pipes a cost-effective choice for large-scale infrastructure projects. Despite their lower production costs, they maintain high mechanical strength and consistent quality.

  
  

• Finally, these pipes are known for their good weld quality and adaptability to various conditions. The submerged arc welding process ensures deep weld penetration and strong bonding, resulting in durable joints with excellent corrosion resistance. They can also be coated with anti-corrosive materials or lined internally to enhance longevity in harsh environments such as offshore pipelines or sewage systems. In short, SSAW/SAWH pipes combine high strength, versatility, and economic efficiency — offering a dependable and affordable solution for modern engineering and pipeline construction.

• SSAW Pipes: Hot-rolled steel strip is uncoiled, edge-trimmed, and fed into a spiral forming machine at a controlled forming angle (typically 45–70°). The seam is continuously welded from both inside and outside using submerged arc welding (SAW) with multiple wires (typically 1 internal, 2 external). Welding parameters are precisely controlled (current: 800–1500 A, voltage: 28–40 V) to ensure deep penetration and high integrity. The pipe is cut to length, expanded (if required), and subjected to 100% ultrasonic testing (UT) and X-ray inspection (RT).

• LSAW Pipes: Steel plates are cut to size, pre-bent, and formed into a U-shape, then O-shape using the JCOE or UOE process. The longitudinal seam is welded via SAW from both sides. Post-welding, the pipe may be expanded (UOE) or mechanically sized (JCOE) to achieve precise geometry and relieve stress. Final steps include hydrostatic testing, end beveling, and coating application if specified.

• Energy Transmission: Long-distance high-pressure transmission pipelines for oil, natural gas, and water.

• Infrastructure Construction: Foundation piling for bridge piers, docks, and offshore platforms.

• Municipal Engineering: Pipe jacking, culverts, sewage discharge systems, stormwater collection systems.

• Structural Support: Columns and large structural members for buildings like large factories and stadiums.

We strictly implement international standards such as API 5L and ASTM A252, maintaining a comprehensive quality monitoring system including online ultrasonic testing, X-ray inspection, and hydrostatic testing. Products can obtain API monogram certification, and we provide full MTC certificates, supporting third-party supervision.

We provide comprehensive pipe pre-processing and machining services:

• Cut-to-length

• Pipe End Beveling (to meet field welding requirements)

• Internal & External Anti-corrosion Coating (e.g., FBE, 3PE)

• Pipe End Stiffener Ring/Flange Welding

• Pipe End Protector Installation

For large-diameter pipes, we employ customized reinforced packaging solutions, such as using high-strength wooden cradles and steel straps for secure fixation during transit. We work with professional and reliable logistics partners to ensure the products arrive safely at your designated port of destination. Shipments are available from major ports like Shanghai, Tianjin, delivering globally.