Tanks for the storage and transport of fluid media under pressure

An internal pressure sustainable tank for the storage and transport of fluid media under pressure comprising, a bottom wall, a top wall, four side walls and an internal framework of plates;

• each of said bottom, top and two opposed side walls consisting of at least two longitudinally extending parallel lobes, each lobe being of part-cylindrical form ith the same radius of curvature and being convex outwardly of the tank with each of its two inwardly-directed longitudinal edges joined to both a longitudinal edge of a lobe alongside and an edge of a plate of said internal framework;
• the latter consisting of two orthogonally intersecting series of parallel plates each plate in one series extending from the joint between two lobes of one of said opposed side walls to the respective opposite joint of its opposite side wall, each plate in the other series extending from the joint between two lobes of the bottom wall to the respective opposite joint between two lobes of the top wall, and the plates of at least one of said series extending longitudinally and being also united to oppositely arranged joints of wall components of the other two opposed side walls so that these latter walls are tied to one another longitudinally, the joints at the inter-sections of the two series of plates, the bottom wall lobes and adjacent plates, the top wall lobes and adjacent plates, and the side wall lobes and adjacent plates being formed by elongate insert elements with a number of arms equal to the number of plates they are to connect, the arms being angled to align with the line of said plates, wherein the improvement comprises each one of said other opposed walls consisting of at least two part-lobes of the same radius of curvature, but of appreciably smaller arc than the lobes of said opposed side, top and bottom walls, which part-lobes present straight edges to which the common straight end edges of a series of two-way corner transition and part-transition pieces are joined, these latter pieces having the same radius of curvature as the lobes at their other end edges and being joined at said other ends to respective lobes of an appropriate one of said opposed side walls, and in that the end of each part-lobe has a respective part-transition piece joined thereto to present a curved edge to which a part spherical three-way corner can be joined to close-off the end wall.