(1) Hydrostatic test: The expanded steel pipe is inspected one by one on a hydraulic test machine to ensure that the steel pipe reaches the standard required test pressure. The machine has automatic recording and storage functions;
(2) Expansion: Expand the diameter of the submerged arc steel pipe to improve the dimensional accuracy of the steel pipe and improve the stress distribution in the steel pipe;
(3) X-ray inspectionⅡ: X-ray industrial television inspection and filming of pipe end welds on steel pipes after diameter expansion and hydraulic pressure tests;
(4) Tube end magnetic particle inspection: perform this inspection to find tube end defects;
(5) X-ray inspectionⅠ: X-ray industrial television inspection of internal and external welds, using image processing system to ensure the sensitivity of flaw detection;
(6) Inspection of internal and external welds of spiral steel pipes and base metal on both sides of welds;
(7) Acoustic inspection Ⅱ: Perform sonic inspection one by one again to check the defects that may occur after the diameter expansion and water pressure of straight seam welded steel pipes;
(8) Chamfer: Pipe end processing is performed on the steel pipe that passes the inspection to reach the required pipe end bevel size;
(9) Anti-corrosion and coating: The qualified steel pipe shall be anti-corrosion and coated according to user requirements.