主题词:corrosion resistance,corrosion-proof design,dimensioning tower structures,dimensioning equipment loaded by external pressure,examination of shell connection,pressure vessel ends,design of openings on pressure vessel,shallow spherical shell,evaluation of elastic-plastic finite element calculations,dimensioning of storage tanks,dimensioning of process equipments,corrosion loads,dimensioning outdoor spherical tanks,bending stress state of axi-symmetrical shell,strength tests of support enviroment,dimensioning on leak tightness of flange joints,time dependent characteristics of gaskets,loosening coefficient of flange joints