Insulated tank container

Claim 1

A light weight insulated tank container system for liquids comprising in combination, a rigid outer framework, a thin inner tank shell comprising a plurality of side by side tanks substantially rectangular in cross-section with outer walls curved outwardly, a foam plastic heat insulation layer outermost shell in contact with the curved surfaces of said outer walls to comprise an outermost surface layer of the container and thereby performing the principal load-bearing surface which has the capacity to take up and transfer stresses in various directions, the foam plastic layer being firmly affixed to and integrated with both the (a) thin inner tank shell to substantially cover the entire surface of the inner tank shell and form together therewith a load bearing unit taking up the forces from the liquid on the thin inner shell and (b) the rigid outer framework to bear the load and dampen blows from external forces, said insulation layer outermost shell being presented as the principal load bearing part over the container system adapted to bear loads.