Spiral welded black pipe is produced for the engineering of tap water, petrochemical, chemical, electric power, agricultural irrigation, and urban building. It is also suitable for various industries like electrical power, chemical, construction, agricultural, petrochemical, water & wastewater engineering etc. Unwound and flattened steel coils are used to create this superior quality spiral welded black pipe. The flattened strip is shaped into the desired diameter of a cylinder using angled rollers. The spiral seam is sealed by an interior and external SAW. One frequently mentioned and well-known duct pipe style is spiral duct. The duct is created by swirling and locking metal strips together to create a one piece.