Safety analysis of 200 m³ LPG spherical tank manufactured by the dieless hydro-bulging technology

This paper briefly introduces the design and manufacturing process of a 200 m³ LPG spherical tank manufactured by the dieless hydro-bulging technology, and then puts emphasis on its safety analysis. The results of measurements and experiments show that the geometrical tolerance and the mechanical properties can meet the requirements of the concerned codes, the wall thickness distributes evenly and there exist compressive residual stresses on the inside surface, which latter are favorable for preventing the hydro-bulged spherical tank from stress-corrosion cracking (SCC) and can improve the fatigue strength.