Aeronautical device for storing liquefied gas having a collector

An aeronautical cryogenic tank device for storing gas, installed on board, with an elongate shape with rounded ends, rounded, spherical or annular about an axis, comprising an inner container defining a liquefied-gas storage chamber, an outer envelope containing the inner container, an insulation chamber defined between the inner container and the outer envelope, the insulation chamber having sealing equal to or better than 10-9 millibar*litre/second, a removable collector passing through the outer envelope and the inner container in a sealed manner, the collector extending over a diameter or a diagonal of the inner container and having a free end close to a bottom of the inner container, and a conduit supplied by the collector, the device comprising a thermally insulating flexible neck forming a gastight interface between the collector on the one hand and on the other hand the outer envelope and the inner container, the neck being provided around a portion of the collector, the neck passing through the insulation chamber to enable the collector to be disassembled independently of a pressure in the insulation chamber.