Spiral factory for water supply and industrial consumptions ­- online production line

This factory which was put into operation in 2002 produces pipes up to 16 m long to be used in water supply lines and industrial foundations, 20-20” in diameter and 25.4 mm thick according to standard AWWA C200 plus complementary demands of clients. The capacity of this factory is 75,000 tons per year.

In the production process of this factory, steel coil is first placed inside the machine, irregular parts at the two ends of the coil are cut and then it is welded to the end of the previous coil by using SAW process. Then, the edges on both sides of the sheet are continuously milled to make it ready for welding. Final shape of the pipe is achieved while the sheet passes through the forming rollers. Simultaneous to forming, the spiral seam of the shaped sheet is continuously made from inside and outside through Submerged Arc Welding (SAW) process and the pipe is cut at the intended length. Then, the two ends of the pipe are beveled by a special milling machine and are tested by hydrostatic pressure based on standard criteria. In the final stage, the pipe is inspected in view of dimensional specifications and other standard criteria and the necessary controls are made and the pipe is finally sent to the warehouse.

Spiral factory for oil and gas pipes - DSSAW Offline production line

Thick pipes up to 16 m long with spiral welding seams of 16-64” in size and 25.4 mm thick are produced at this factory with a capacity of 225,000 tons per year. Production of the factory includes types of special steel pipes for oil and gas lines that conform to authentic international standards such as API5L and complementary specifications of the clients.

In the production process, steel coil is placed on the coil opener, and the irregular part of the beginning of the coil is cut. Then, it is placed in the forming machine, and the end side of the previous coil is welded to the beginning side of the new coil. While the sheet is directed forward, the longitudinal edges on both sides of the sheet are milled. The pipe is finally shaped as the sheet passes through the rollers of forming machine. Simultaneous to forming, the contact point of the two edges of the sheet is continuously welded and the pipe is cut at the intended point. In the next stations, the spiral seam of the pipe is simultaneously completed from the inside and outside through SAW process. Then, the finished pipe is tested by hydrostatic test using high pressure water. To ensure the high quality of the pipe, the entire weld and the pipe body are first tested by ultrasonic test. Then, the end welded point of the pipe is tested by fluoroscopy system. Following that, the two ends of the pipe are milled and once again, the end side of the pipe is controlled and tested by MT and UT tests and the pipe is made ready to be delivered to the client.