Patent ID: 8910487

Claim:
A storage tank assembly for the storage of cryogenic liquids comprising a first outer tank and a second inner tank, the first and second tanks being spaced apart from one another to form an insulation space, the storage tank assembly further comprising a cryogenic liquid delivery system comprising an eductor located within the second inner tank so as to entrain cryogenic vapour during filling of the inner tank with cryogenic fluid, wherein the storage tank assembly further comprises an ullage vessel contained within the second tank and comprising a first aperture and an opposite second aperture, whereby, in use, the first aperture is located below the second aperture, and is larger than the second aperture, wherein the ullage vessel has an upper face and a lower face with the upper face thereof in facing relationship to a top wall defining the second inner tank, and at least said second aperture is comprised of a breathing hole that is open to an interior of the second inner tank and wherein the eductor is positioned outside the ullage vessel and is operatively isolated therefrom.