Coil pipe device for reducing pressure of LNG (Liquefied Natural Gas) storage tank

The utility model relates to the technical field of liquefied natural gas storage equipment, in particular to a coil pipe device for reducing the pressure of an LNG storage tank, which comprises a storage tank, a coil pipe is arranged in the storage tank, the coil pipe is connected with a low-temperature pump, and the coil pipe comprises a condensing medium outflow pipeline, so that the setting height of the condensing medium outflow pipeline is higher than that of the coil pipe. According to the device, only the coil pipe and the low-temperature pump are utilized, so that gaseous natural gas in the storage tank and a condensing medium in the coil pipe are subjected to heat exchange to reduce the temperature or liquefied, the pressure in the storage tank is directly reduced, and the use safety of the LNG storage tank is ensured. And the arrangement height of the condensing medium outflow pipeline is higher than that of the coil pipe, so that the liquid condensing medium flows out after being fully gasified in