Discussion on several problems in standard NB/T 47013. 4－2015

This paper aims to discuss the relevant clauses of NB/T47013. 4-2015. Different views for the classification of testing methods, the time to stop magnetization by continuous method, the magnetization energization time of continuous method, the application of magnetic powder or magnetic suspension for the residual magnetization method, and the magnetic particle detection of in-use pressure equipment were put forward. The revision suggestions were also put forward, which may help to further improve the standard.