Spiral, the production process is simple, practical, large; production of high efficiency, high strength; low cost, low cost, rapid development. For drainage, sewerage, raft mud; liquid, gas, pipeline transportation: bridge, steel structure support. Sheet problems, the company adopted Jianlong specifications coil, (with some small family produced a long strip, steel broadband) thickness and compressive strength, is entirely different. Weld problem, the company adopted the U.S. production of Lincoln automatic welding, weld grinding machine, flat head chamfering machine, strict implementation of standards to ensure quality. Increase of the strength testing and issue by the company's steel factory, every pressure must fight, do not fight the water pressure does not allow the factory to protect the customer's requirement Pressure.