LNG sub-mother tank 　　LNG sub-mother refers to a storage tank in which multiple sub-tanks containing LNG are connected in parallel and placed in a mother tank filled with insulating materials in a certain arrangement. It is usually built to meet the requirements of large-volume, pressurized storage, and it is widely used in the field of medium and large (1000m³~10000m³ storage scale) LNG gasification stations.   　　Product Details 　　product structure 　　LNG sub-mother  tank is composed of multiple sub-tanks, a mother tank and corresponding process pipelines, valves, instruments, etc. 　　Sub-tank: As the main container for the low-temperature medium, it is made of austenitic stainless steel S30408; the structure of sub-tank is a vertical cylindrical leg structure. According to the size of the volume, 4, 7 or 10 sub-tanks are arranged in a certain arrangement. The gas and liquid phases of all or grouped sub-tanks are connected through pipelines. 　　Mother tank: As the protective shell of the thermal insulation system, Q345R/16MnDR material is usually used. The mother tank contains all the sub-tanks, and adopts powder accumulation insulation for cold preservation to ensure that the storage medium is as little as possible to vaporize. 　　The main technical parameters 　　Storage medium: LNG 　　Working pressure: 0.2MPa~1.6MPa 　　Single unit volume: 600m³~3000m³ 　　Equipment type: storage tank, pressure vessel   　　main advantage 　　The single equipment has a large storage capacity, which occupies a smaller area than a vacuum tank of the same volume, has less investment, and is easy to operate. 　　The equipment maintains the operating pressure through a self-booster, without the need for booster pumps, BOG compressors and other equipment, with low operating costs and easy maintenance.