Difference between NB/T 47013.2-2015 and DL/T 821-2017 in the radiographic testing of power plant boiler

NB/T 47013.2 and DL/T 821 are used widely in the radiographic testing of power plant boiler, and differences between the two standards will lead to very different evaluation results. This paper analyzes and compares the differences between the standards above from three aspects:assessment range, radiographic technology and quality classification assessment, and points out the improvement measures of boiler radiographic testing which uses DL/T 821.