Tianjin Yanfeng Machinery Co., Ltd. (Yanfeng for short) located at No. 2, Hualong Road, Hedong District, Tianjin, China, is a high-tech enterprise. specialized in design, R&D and manufacture of spiral welded pipe equipments, steel pipe hydrostatic testing machines, chamfering machines and finishing area equipments, pre-stressing steel strand equipments & PC bar production equipments .Yanfeng has a strong technical force. The number of professor senior engineers, senior engineers and other technicians makes up over half of the company's total staff.Yanfeng has a strong capacity of R & D and manufacture and supporting the design, and can bear the "turn-key" project. Since 1999, Yanfeng has succeeded to provide users with more than 80 sets of spiral welded pipe production lines, which covers more than 20 provinces and cities. What� more, our products firmly implement the API, BG standards.