Cryogenic transport

A system for anchoring a cryogenic bulk liquid holding tank of aluminum metal construction to and integrating such tank with an outer envelope-like supporting hull structure of ferrous metal comprising the combination of an aluminum cryogenic bulk liquid holding tank, cryogenic insulation anchored to the interior surfaces of the aluminum tank, said insulation comprising alternate layers of relatively rigid closed cell polyurethane foam material and thin aluminum foil membranes with the portion of the insulation that is exposed to and in direct contact with the liquid in the tank being an aluminum foil membrane, a ferrous metal envelope-like supporting hull structure encompassing in spaced relation at least the major outer surface portions of the aluminum liquid holding tank and transition connector means interposed between the tank and hull structure and anchoring the aluminum liquid holding tank to and integrating such tank with the ferrous metal envelope-like supporting hull structure to form a composite stress resistant unit, said transition connector means comprising a plurality of spaced composite stringer elements each of which is made up of an aluminum portion affixed directly and rigidly to said aluminum tank's outer surfaces and a ferrous metal portion affixed directly and rigidly to the inner surface of the ferrous metal envelope-like supporting hull structure and the aluminum and ferrous metal portions of a stringer element also being directly and rigidly bonded to each other.