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A large, box-like polygonal tank for storing liquefied gas on land or on ground based structures (GBS) and a method of constructing the tank. The tank is comprised of an internal, truss-braced, rigid frame, having a cover on the frame for containing the stored liquid within the tank. The internal, t

A large, box-like polygonal tank for storing liquefied gas on land or on ground based structures (GBS) and a method of constructing the tank. The tank is comprised of an internal, truss-braced, rigid frame, having a cover on the frame for containing the stored liquid within the tank. The internal, truss-braced frame allows the interior of the tank to be contiguous throughout while compensating for the dynamic loads caused by the “sloshing” of stored liquid which, in turn, is due to the short excitation periods cause by seismic activity or the like.

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A large, box-like polygonal tank for storing liquefied gas on land or on ground based structures (GBS) and a method of constructing the tank. The tank is comprised of an internal, truss-braced, rigid frame, having a cover on the frame for containing the stored liquid within the tank. The internal, t

A large, box-like polygonal tank for storing liquefied gas on land or on ground based structures (GBS) and a method of constructing the tank. The tank is comprised of an internal, truss-braced, rigid frame, having a cover on the frame for containing the stored liquid within the tank. The internal, truss-braced frame allows the interior of the tank to be contiguous throughout while compensating for the dynamic loads caused by the “sloshing” of stored liquid which, in turn, is due to the short excitation periods cause by seismic activity or the like. ing a frame body that becomes the side plate portion, and disposing inside the frame body a forming surface for forming the filtering portion; and extruding semi-molten fibers to the frame body and the forming surface, the forming surface having an undulating shape with concavities and convexities. 13. The production method according to claim 12, wherein: the forming surface is formed on a forming die; and the production method further comprises removing the forming die from the filter after the extruding of the semi-molten fibers. 14. The production method according to claim 12, wherein: the forming surface is formed on a forming die; the forming die becomes a portion of the filter; and a grain roughness of the side plate portion attained after formation of the filter is made less than or equal to a grain roughness of the filtering portion attained after the formation of the filter by providing the frame body with a grain roughness that is less than a grain roughness of the forming die by at least a predetermined value. 15. The production method according to claim 12, wherein: the forming surface is formed on a forming die; the forming die becomes a portion of the filter; and an air flow resistance of die side plate portion attained after formation of the filter is made greater than or equal to an air flow resistance of the filtering portion attained after the formation of the filter by providing the frame body with an air flow resistance that is greater than an air flow resistance of the forming die by at least a predetermined value. 16. A filter produced by the production method defined in claim 12.17. The production method according to claim 12, wherein the filtering portion is accordion shaped.18. The production method according to claim 12, wherein the semi-molten fibers are extruded on both inside and outside surfaces of the frame body.19. A production method for producing a filter that has a filtering portion for filtering a fluid, and a side plate portion that closes two opposite sides of the filtering portion, comprising: providing a frame body that becomes the side plate portion, and disposing inside the frame body a forming surface for forming the filtering portion; and extruding semi-molten fibers to the frame body and the forming surface, wherein the frame body is a tapered frame body that is expanded with respect to a direction of extrusion of the semi-molten fibers. 20. A production method for producing a filter that has a filtering portion for filtering a fluid, and a side plate portion that closes two opposite sides of the filtering portion, comprising: providing a frame body that becomes the side plate portion, and disposing inside the frame body a forming surface for forming the filtering portion; and extruding semi-molten fibers to the frame body and the forming surface, wherein the frame body is a tapered frame body that is narrowed with respect to a direction of extrusion of the semi-molten fibers. 21. An apparatus for producing a filter, the apparatus comprising: a conveyor that carries and conveys a forming die for forming the filter; an extruder that extrudes semi-molten fibers to a forming surface of the forming die carried on the conveyor, the forming surface having a filter-forming portion for forming a filtering portion of the filter, the filter-forming portion having an undulating shape with concavities and convexities; and a device that gathers the semi-molten fibers toward an upstanding surface portion of the forming surface when the extruder extrudes the semi-molten fibers to the forming die, the upstanding surface portion located peripherally to rising and falling portions of the undulating shape. 22. The apparatus according to claim 21, wherein the device that gathers the semi-molten fibers forcibly gathers the semi-molten fibers toward the upstanding surface portion.23. A filter formed so as to have a shape substantially identical to a shape of