Abstract: An isolable double-walled insulation tank for a launch vehicle includes a hollow open cylinder part having upper and lower end portions that are open in an upright state; an upper cap part for sealing the upper end portion of the open cylinder part; and a lower cap part for sealing the lower end portion of the open cylinder part. The open cylinder part includes a flat plate part having a flat outer peripheral surface; an uneven part slidably fitted and coupled to the flat plate part; and a plurality of load-dispersing spaces which are ring-shaped according to a portion of the uneven part being spaced from the flat plate part, and which are arranged to be spaced apart in the height direction of the open cylinder part.

Abstract: An isolable double-walled insulation tank for a launch vehicle includes a hollow open cylinder part having upper and lower end portions that are open in an upright state; an upper cap part for sealing the upper end portion of the open cylinder part; and a lower cap part for sealing the lower end portion of the open cylinder part. The open cylinder part includes a flat plate part having a flat outer peripheral surface; an uneven part slidably fitted and coupled to the flat plate part; and a plurality of load-dispersing spaces which are ring-shaped according to a portion of the uneven part being spaced from the flat plate part, and which are arranged to be spaced apart in the height direction of the open cylinder part.

Abstract: A vortex prevention apparatus prevents a vortex from being generated at an outlet provided in the tank member and minimizes the change in the flow rate of the fluid being discharged through the outlet when a fluid filled in a tank member such as an insulation tank is being discharged, To this end, the vortex prevention apparatus is integrally coupled to a lower cover, having at least one outlet through which the fluid filled in the insulation tank is discharged, of a lower cap of the insulation tank, and includes a prevention body having a cone shape centered on an apex portion; spacing members extending vertically and horizontally from the prevention body; and mesh hole portions formed passing through the edges of the prevention body by the spacing members.