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See Chinese contents: NB/T 47013.3-2015 NB/T 47013.3-2015: Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing [Including 2018XG1]
This Part of NB/T 47013 specifies the pressure equipment shall adopt ultrasonic testing method and quality grading requirements in which shape A pulse reflection ultrasonic detector is used to test work piece defect.
