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The SISTEM tank design uses a 13-liter cylindrical barrel with two elliptical domes on the top and bottom. The volume of the tank is increased by inflating the structure, thereby increasing its length. Several different functional layers are required to provide fluid containment, pressure containment and insulation for specific applications. Requirements were defined for both conventional fluids as well as cryogenic fluids. The prototype design focused on laboratory demonstration of the pressure storage with conventional fluids.
The tank assembly included: