Double-Sided Submerged Arc Welded Spiral Pipe is a type of steel pipe manufactured using the submerged arc welding process, featuring a single spiral seam. It is produced on the most advanced continuous flying-welding production line in China, equipped with imported internal and external welding machines. The technology is highly sophisticated, with double-sided submerged arc automatic welding for both the interior and exterior surfaces. Each production line is equipped with a hydraulic tester, an advanced ultrasonic full-body material and seam automatic inspection system, and an X-ray real-time imaging inspection system. It also features a national-level CNAS laboratory.