At present, LNG cryogenic storage tanks frequently used at home and abroad have three modes: normal pressure storage, sub-mother tank storage under pressure, and vacuum tank storage under pressure. Which storage method is used depends mainly on the size of the storage capacity.

The second is the vacuum tank:

   The vacuum tank is a double-layer metal tank, the inner tank is a low-temperature resistant stainless steel pressure vessel, and the outer tank is made of carbon steel material, the interlayer is filled with insulation material, and the vacuum is drawn. The vacuum tank is transported to the site as a whole after the pressure test is completed in the factory.

   The total storage capacity of LNG storage tanks is below 1000m³. Generally, multiple vacuum tanks are used for centralized storage. Currently, the maximum single tank volume of vacuum tanks used in China is 150m³. The vacuum tank process is relatively simple. Generally, a booster is used to pressurize the storage tank. The material flows into the vaporizer by pressure without using power equipment and has low energy consumption. Therefore, the small-scale LNG gasification stations at home and abroad basically all use vacuum. Can form.