handhole

Further more, tension stress near handhole was in the range of designed value.

而手孔部位的局部力较小，均在控制力范围之内。

Body has handhole (or manhole) for easy wash and examination, And bottle valve set up inlet/outlet valve,safety valve, pressure gauge and pressure gauge valve, drain valve etc.

筒体上设有手孔（或人孔），以便清理、修。瓶头阀上设有进气阀、出气阀，安全阀、压力表和压力表阀、泄放阀。