    |
The spiral welded pipe mill line
Process chart
This mill is capable of making pipe for oil, water, and gas transmission or for pilings.
1. decoiler and testing: decoiling with the steel strip, operate ultrasonic testing firstly.
2. edge miller: make the steel sheet to required width, edge parallelization and groove shape.
3. shearing and forming: shear the steel sheet to tubular shape according to the out-to-out spiral.
4. welding and cutting: after finishing the inner and outer welding, cut the pipe to length.
5. visual test: operated by technician with the main parameters.
6. ultrasonic test: test the inner ,outer welded seam and the base metal.
7. X-ray test: test the inner and outer welded seam.
8. bulge test: test every steel tube with the hydrostatic testing machine.
9. bevelling and facing: bevel the steel tube edge to required size.
10. final test: ultrasonic and X-ray test again, magnetic particle inspection.
11. oil coating and marking: do oil coating to protect corrosion, marking with customers¡¯ requirement.
Process chart
This mill is capable of making pipe for oil, water, and gas transmission or for pilings.
1. decoiler and testing: decoiling with the steel strip, operate ultrasonic testing firstly.
2. edge miller: make the steel sheet to required width, edge parallelization and groove shape.
3. shearing and forming: shear the steel sheet to tubular shape according to the out-to-out spiral.
4. welding and cutting: after finishing the inner and outer welding, cut the pipe to length.
5. visual test: operated by technician with the main parameters.
6. ultrasonic test: test the inner ,outer welded seam and the base metal.
7. X-ray test: test the inner and outer welded seam.
8. bulge test: test every steel tube with the hydrostatic testing machine.
9. bevelling and facing: bevel the steel tube edge to required size.
10. final test: ultrasonic and X-ray test again, magnetic particle inspection.
11. oil coating and marking: do oil coating to protect corrosion, marking with customers¡¯ requirement.