Brief：1.the process advanced, pipe valve instrument layout is reasonable, nice equipment. 2. the inner tank structure combined with advanced high-purity nitrogen as the inner tank tightness test and retain the strength of not less than 0.2Mpa dry nitrogen as gas seal to ensure that the equipment after it reaches the user dry and clean. 3. hanging between the inner and outer tank supporting structure is reasonable, to ensure the equipment in a variety of working conditions meet the strength requirements, while supporting hanging minimize heat conduction. 4.perlite filling excellent equipment, advanced processing technology, quality and perlite perlite filling quality assurance, good insulation properties, evaporation rate. 5. dual sets of safety relief devices to ensure the safe use of the tank. 6. sand-blasting thorough, high-quality enamel surface coating outer tank.