Double-sided spiral submerged arc welding technology, narrowband (board) volume continuous welded from steel pipes. Has been applied widely in China's West-East and other oil and gas pipeline project, China's oil and gas pipeline project with the main tube. Spiral steel pipes are widely used in natural gas, petroleum, chemicals, electricity, heating, drainage, steam heating, hydropower penstock, thermal power, water and other long-distance pipelines, piling, dredging, bridges, steel and other engineering fields. Longitudinal production process is simple, high efficiency, low cost, rapid development. The strength of the spiral welded pipe specifications are generally higher than the Longitudinal and spiral welded pipe specifications can narrow the billet production of large diameter welded pipe, spiral welded pipe specifications can also use the same width of the billet production of different diameters of pipe . However, compared with the same length of straight seam pipe, spiral welded pipe specifications weld length increased by 30 to 100%, and spiral welded pipe specifications lower production rate. Therefore, the smaller diameter pipe mostly straight seam welded pipe of large diameter are mostly spiral welded pipe specifications. http://www.thgangguan.com spiral steel pipe http://www.naimoguanjian.com pump tube http://www.hbthgg.com spiral steel pipe factory