1) checking hole
检查孔
1.
When the pressure vessel is designed without checking hole, the calculated thickness of the pressure vessel written on the drawing, sometimes, is not the same illustrated in GB150-89.
在压力容器中不设置检查孔所需标注的“计算厚度”,并非是GB150-89中的“计算厚度”,应考虑参与补强所需厚度这个因素。
2) pupil examination
瞳孔检查
3) handhole