Natural gas is one of the world's three major energy pillars. As a clean energy, its consumption is increasing year by year. However, the distance between the place of production and the place of consumption of natural gas is relatively long, and its transportation is often limited by cost and technology. The emergence of liquefied natural gas has solved the problem of long-distance transportation of natural gas to a certain extent. In the process of natural gas transportation and storage, LNG full-capacity tanks are indispensable. Taking the LNG full-containment tank as the main object of research, it focuses on analyzing the structure and performance of its inner and outer tanks.

　　In the natural gas industry chain, liquefied natural gas (LNG) provides convenience and advantages for energy transportation and storage. Since LNG is a cryogenic liquid substance, its storage technology requirements are high. Storage tanks have developed from single-capacity tanks to double-capacity tanks in the initial stage to full-capacity tanks with mature technology, and the capacity of storage tanks is also increasing. The single tank capacity has reached 200,000 m3.

　　China's LNG full containment tank industry is showing a vigorous development momentum. The vigorous development of the LNG full containment tank industry will surely change China's energy consumption structure, improve the ecological environment, and enhance the sustainable development of the economy and society. The storage tanks of China's LNG full-capacity tank receiving station basically use 160,000 m3 full-capacity storage tanks. Full-capacity storage tanks have high technical requirements, complex structures, difficult design, installation and construction, long periods, and high material requirements. Research and analysis of LNG full-contained tanks have universal and practical significance.

　　LNG full containment tank is stainless steel inner tank, plus insulation layer, plus outer tank (stainless steel or reinforced concrete pouring); full containment tank is a tank type between single containment and double containment, double containment inner tank (stainless steel material) In addition, there is a layer of outer tank (stainless steel or reinforced concrete pouring), but the top of the outer tank is not closed, which can double-contain, but the outer tank is in contact with the atmosphere, and the inner tank is a closed container and the outer tank is an unclosed container ; The full containment tank means that when the inner tank leaks, LNG can be reliably stored by the outer tank, which is equivalent to a two-layer airtight container. The above dual-capacity and full-capacity are actually used for large-scale LNG storage tanks, and small storage tanks are basically single-capacity tanks.