Energy-saving LNG (Liquefied Natural Gas) tank

The utility model discloses an energy-saving LNG tank which comprises a tank body, an access cover and mounting bolts, the access cover is arranged on the right side of the tank body, a detachable structure is formed between the access cover and the tank body through the mounting bolts, a first conveying pipe is arranged on the inner side of the access cover, and a second conveying pipe is arranged below the first conveying pipe. Products in the tank body are pumped out through the first conveying pipe and the second conveying pipe, the right ends of the first conveying pipe and the second conveying pipe are both connected with guide pipes, the right side of the first conveying pipe is connected with a variable frequency pump through the guide pipe, and the right side of the second conveying pipe is connected with a constant speed pump through the guide pipe. The energy-saving LNG tank adopts a mode of one variable-frequency pump and one constant-speed pump to carry out optimal configuration, the rotating spe