The steel silo is a kind of thin-wallshell structure, so it is sensitive to imperfection.
钢板筒仓是一种薄壁壳体结构，对缺陷非常敏感。
2
According to the sine law, vertical wallshell cannot be finished at one time in nc incremental sheet metal forming process, it must be formed at many times.
A fuming sulfuric acid tank commissioned in 1997 in Baling Petrochemical Company have experienced a number leakages at the top of the tank, welds and wallshell.