Patent GB-1030858-A (GB)
Title: Improvements relating to a storage container
IPC: E04H7/06
Filed: 1962-10-23
Abstract: 1,030,858. Storing liquefied gases. MOTHERWELL BRIDGE & ENGINEERING CO. Ltd. and W. KOHRING. Jan. 11, 1963 [Oct. 23, 1962], No. 40130/62. Heading F4P. A liquified gas storage container of cylindrical shape has its cylindrical wall formed at least partly from a constructional member of metal or metal alloy comprising a first substantially flat sheet 14, Fig. 3 or 9, and at least one second sheet 15 disposed in face-to-face relationship with a surface of the sheet 14, the or each sheet 15 being formed to provide at least one elongated trough 16 between a pair of ridges 16a and being secured to the surface of the sheet 14 over the entire area of contact of the ridges therewith, the sheet 14 constituting an inner skin of the container and the trough or troughs and ridges of the sheet 15 being parallel with the longitudinal axis of the container. The latter forms the inner vessel 5 of a double-walled tank and has a base 6 overlying a plate 8a, and a roof 7. The tank has an outer casing 2 having a base 3 and a roof 4. Solid insulating material 8 is disposed between the base 3 and the plate 8a and the space 9 between the casing 2 and the vessel 5 contains insulating packing 9a, e.g. of a granular nature. The casing 2 is preferably formed by a plurality of sheets 10 welded together in overlapping formation. The inner vessel 5 is formed in two parts 11 and 12 joined by an angle ring 13, each part 11, 12 being made from a constructional member of nickel steel alloy containing about 9% nickel and formed as above described; the constructional members are preferably welded to the ring 13 and to other rings 17 and 18 respectively joining the wall of the vessel 5 to its base 6 and its roof 7. The rings 17 and 18 may be partly toroidal in shape to facilitate the flow of the packing 9a. The method of securing the sheets 14 and 15 together should be such as to enable the connection to withstand a temperature change of several hundred degrees Fahrenheit, e.g. from minus 300 F. to 100 F.; the connection may be by welding or by adhesives such as epoxypolyamine resins, polyurethane elastomers and nylon epoxy polymers. The mating surfaces of the sheets may be roughened as by sand-blasting prior to the securing of the sheets together. The parts 11 and 12 of the vessel 5 may be formed of smaller sheets welded together, the joins of the sheets 14 being staggered from those of the sheets 15. The lower part of the vessel 5 may be reinforced, by a prestressed sheet 19 which is clamped in position or attached to the sheets 15; alternatively, a prestressed wire may be wound around the vessel 5. A take-off pipe 5a extends from a suction pot 5b which in order to locate the vessel 5 extends through apertures in the base 6 and the plate 8a; alternatively, the vessel 6 may be located by a protrusion 6a, Fig. 6 (not shown), welded to the underside of the base 6 and projecting through an aperture 8b in the plate 8a. The vessel 5 is secured by bolts 22 which project through tubes disposed in the insulating material 8 and which engages cleats 23 secured to the sheet 19 or to the sheet 15 of the part 11 of the vessel 5. To facilitate movement of the vessel 5 dry molybdenum disulphide is located between the base 6 and the plate 8a. The roof 7 of the vessel 5 may be formed at least partly of constructional members formed as above described, e.g. panels 34, Fig. 1 (not shown). In constructing the container the base 3 of the casing 2, the insulating material 8, the plate 8a and the base 6 with the ring 17 are assembled first, Fig. 7 (not shown), the casing 2 being then built to leave a window 24 therein through which is passed the constructional members which are coiled upon reels 25 to facilitate transport thereof. The edge 27, Fig. 8, of the coiled constructional member for part 11 of the vessel 5 is located by struts 28 from the casing 2, the member being thereafter uncoiled to form the part 11. Pegs 30, Fig. 5 (not shown), are inserted between the sheets 14 and 15 of the constructional member, the pegs coacting with the ring 17 to position the member. Additional struts 28 may be provided around the uncoiled member and a hawser may be used to draw the vertical edges thereof together for welding. The pegs 30 may be dispensed with by extending the sheet 15 below the edge of the sheet 14.