manhole shell 人孔座
Shell as used herein shall mean all pressure holding parts of the vessel in contact with the service fluid, including heads, nozzles, manholes and manhole covers.
这里的壁板指与系统介质接触的所有压力部件，包括封头、设备口、人孔及人孔盖板。
The paper introduced briefly produce quality control in pressure vessel′s shell and manhole nozzle welding, how avoided crack and found defect by ultrasonic testing after welding.
介绍了压力容器人孔接管与厚壁筒体相焊时，如何控制产品的质量，避免产生裂纹，焊后通过超声波检测及时发现缺陷。
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