It can be widely used in petroleum, chemical industry, chemical fiber, medicine, food and so on. Shanghai Iron and ... gas. Therefore, it can be widely used in petroleum, chemical industry, chemical fiber, medicine, food and so on. 304,316,316 ... refrigeration,such as:liquefied methane,liquefied ammonia,oxygen;4.Industry hygiene medium in light industry,foodstuff and pharmacy,such as:beer,dink,beverage ...