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一、绪言发展产业、工业所不可缺少的化学原料和从事生产活动的能源是我们生活的基础,其消费量正在稳步地增长。代替石油作能源而引人注目的液化天然气(LNG)在1977年就达到839万吨的需要量,而到1995年 LNG 的需要量估计为5000万吨;同时被用来作化学原料和燃料的液化石油气(LPG)1975年的耗量为739万吨,而到1995年估计需要3300万吨。随着各种液化瓦斯需要量的增大,其储藏设备也必将增加,可以预料今后建设量也将增长。因液化瓦斯一般存低温储存,所以也有相应的低温储罐规格。仅就低温
I. INTRODUCTION The chemical raw materials and energies that are indispensable to the development of industries and industries are the basis of our lives. Their consumption is steadily growing. LNG, which attracts attention as an alternative source of energy for energy, reached a demand of 8.39 million tons in 1977, while LNG demand was estimated at 50 million tons by 1995; at the same time, it was used as a chemical raw material and fuel Liquefied petroleum gas (LPG) consumed 7,390,000 tonnes in 1975, compared with an estimated 33 million tonnes by 1995. With the increase of various liquefied gas requirements, the storage facilities will also increase. It is expected that the construction volume will also increase in the future. Due to liquefied gas storage in general low temperature, so there is a corresponding cryogenic tank specifications. Only low temperature