Nondestructive testing of large diameter seamless steel pipe: because this pipe belongs to super large steel pipe in water supply project, especially the steel pipe with thickness of t=30 mm is used as a pipe bridge, which not only bears the internal water pressure, but also bears the bending moment formed by the steel pipe's dead weight and water body, so the quality requirements for welding are particularly high.
For the t=30mm thick steel pipe used for large-diameter seamless steel pipe bridge, its longitudinal seam and circumferential seam belong to Class I weld, and 100% X-ray radiography and 100% ultrasonic flaw detection are required; For buried steel pipes with a thickness of t=24mm, the longitudinal joints belong to Class I welding, and 20% X-ray examination and 50% ultrasonic flaw detection shall be carried out.
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