What inspections are required after submerged arc steel pipe production

 (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.

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