NOVELTY - A storage tank has an inner vessel (22) within an outer vessel (24). A common-access tube communicates with a vacuum between the vessels, and extends into an interior of the inner vessel. A straight portion of the tube has a cross-sectional area smaller than the cross-sectional area of a flared end portion of the tube. Fluid flow lines (26) extend from an exterior of the inner vessel to the inner vessel via the tube and pass through an end plate in the flared end portion of the tube. The outer vessel has two end caps (62, 64) welded to opposing ends of a central segment (60).    USE - Used in a mobile platform e.g. vehicle, and in a stationary application, for supplying a fluid e.g. hydrogen, to a downstream component such as a fuel cell stack and internal combustion engine.    ADVANTAGE - The fluid flow lines extend from the exterior of the inner vessel to the interior of the inner vessel through the common-access tube that minimizes an interference with applying insulation layers to inner vessel. The common-access tube facilitates modular construction of the cryogenic storage tank, provides a desired temperature profile and reduces the heat paths into the inner vessel. The configuration of the tube helps to minimize parasitic heat leaks from natural convection inside the fluid flow lines. The attachment of the end caps to the central segment provides additional support for the central segment and limits deformation due to the suspending of the inner vessel within the outer vessel.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a modular component for cryogenic storage tank comprising a tube; and    (2) assembling the cryogenic storage tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a fragmented front plan view of a cryogenic storage tank with end caps.    Inner vessel (22)    Outer vessel (24)    Fluid flow lines (26)    Bracket (48)    Tensioning mechanism (50)    Central segment (60)    End caps (62, 64)    Annular stiffening rings (68)    Suspension members (80)    Rollers (94)