At present, the commonly used LNG cryogenic storage tanks at home and abroad have three methods: atmospheric storage, sub-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 first one is: mother and son tank

   The inner tank of the sub-tank is a number of low-temperature resistant stainless steel pressure vessels, and the outer tank is a large carbon steel container covering the outer tanks. The inner and outer tanks are also filled with insulation materials, and the interlayer is filled with dry nitrogen to prevent moisture. Air enters. The inner tank of the sub-tank is manufactured in the factory and transported to the site after pressure test, and the outer tank is installed on-site.

   Storage and distribution stations with a storage scale of 1000m³ to 5000m³ can be stored in sub-tank or atmospheric tank according to the situation. Due to the requirements of inner tank transportation, the largest single vacuum storage tank in domestic land transportation is 250m³, and the gas in the sub-tank is used. The chemical process is roughly the same as that of the vacuum tank. Because the interlayer needs to be ventilated with nitrogen, a set of liquid nitrogen device is added to the device.