Silo normally is a normal pressure equipment with big diameter but thin thickness. Due to relatively small rigidity, it should be manufactured in reasonable process and with certain good equipment. Our company has good job site fabrication experiences for big size and thin wall thickness equipment to well control welding deform , assure fabricated equipment good roundness, good looking welding seam, smooth interior and exterior surface. The big size silos fabricated by our company have been successfully installed in the big scale petrochemical industry bases in our country.