Method of planning and manufacturing an lng storage tank or the like and an aluminium lng storage tank manufactured using the method

A method of manufacturing a tank suitable for storing very cold cryogenic liquids, such as liquefied ethylene (LEG) or natural gas (LNG) or a corresponding medium, the basic form of the tank corresponding to a rectangular prism and being manufactured from aluminium or the like material, wherein the tank is produced at least mainly from prefabricated structure elements of few different types so that plane elements meant as shell elements are produced by mechanically extruding profile elements including a plane part and a stiffening part the stiffening part extending essentially perpendicular to the plane part and having a free distal end relative to the plane part, and the profile elements are welded to each other by their plane parts by using friction welding, and the plane elements hereby produced are provided with longitudinal and/or transverse stiffeners produced by mechanically extruding profile elements which are welded to each other by using friction welding, and that the plane elements having stiffeners are attached to each other and/or to separately produced edge and/or corner elements into self-supporting volume units having at least four sides, the said stiffeners extending only partly through the internal space of said volume units between the opposite sides thereof.

An aluminium tank or the like, suitable for storing LNG or the like medium to be stored in very low temperatures, the basic form of the tank corresponding to a rectangular prism, wherein the tank is produced at least mainly from prefabricated construction elements of few different types, the elements including plane elements to be used as shell panels of the tank, the plane elements being produced of mechanically extruded aluminium profile elements or the like, the profile elements including a plane part and a stiffening part, the stiffening part extending essentially perpendicular to the plane part and having a free distal end relative to the plane part, and the profile elements being welded by their plane parts to each other by means of friction welding to produce the plane elements, and the plane elements being provided with longitudinal and/or transverse stiffeners being produced of mechanically extruded aluminium profile elements or the like welded to each other by means of friction welding, and the plane elements having stiffeners being attached to each other and/or to separately produced edge and/or corner elements into self-supporting volume units having at least four sides, the said stiffeners extending only partly through the internal space of said volume units between the opposite sides thereof.