Acoustic Emission Testing of Cylindrical Reactor Pressure Vessel during Hydrotests

수압시험중(水壓試驗中)의 원주형(圓柱型) 압력용기(壓力容器)에 대(對)한 AE검사(檢査)

One of the cylindrical reactor vessels in petrochemical plants was examined by acoustic emission method. The vessel was quiet in view of A.E. activity throughout the pressure range $12-44kg.f/cm^{2}.G$. Above the pressure of $44kg.f/cm^2$, some events were appeared lower than 30 counts. In order to verify the events, other Nondestructive testing methods were performed and a surface crack, 10mm in length and 0.8mm in depth, was found on the outside surface of circumferential weld.