Nondestructive testing(NDT)is the most important part in the periodic inspection of special equipment.When ultrasonic testing is carried out on reheat steam pipelines of a power plant,the same defect is tested with different standards,resulting in different evaluation results.In this paper,the sensitivity of standard NB/T 47013.3-2015 and JB/T 4730.3-2005 is analyzed and compared,and the detection sensitivity of ultrasonic testing in CSK-IIA-1 test block and CSK-IIIA test block is studied by test.The experimental and field test results show that the sensitivity of CSK-IIA-1 test block is higher than that of CSK-IIIA test block in the welded joints of pipes with wall thickness range of 6～40 mm and diameter≥500 mm.
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