US 5,664,313 AGranted

Method of making double-wall tank for the storage of liquids

OwnerDavid T. Palazzoinventor

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Abstract

A method is disclosed for manufacturing from a rigid single-wall tank having spindle members attached to and extending outwardly of each of its end portions a rigid double-wall tank for the storage of liquids. The method includes applying to the exterior surface of the inner tank a spacing material, applying over the inner tank and the spacing material an outer sheath with at least a portion of the outer sheath applied adjacent to each spindle member then removing at least one of the spindle members from the end portions of the inner tank and urging the outer sheath overlying the end portions away from the end portions to form a space between the end portion of the inner tank and the outer sheath, inserting into the spacing material and then sealing the end portion of the inner tank by applying a substantially liquid-tight sheath. From this method there results a rigid double-wall storage tank having an outer sheath spaced from the outer surface of the inner tank along at least a portion of cylindrical side walls and the end portions of the inner tank.

Claims18

Dependent claims

A method of manufacturing a double-wall tank for the storage of liquids comprising the steps of:

providing a rigid, single-wall inner tank having generally cylindrical side-wall portions and closed end portions generally transverse to said side-wall portions, said inner tank having an exterior surface and elongated spindle members being attached to and extending outwardly of each of said end portions of said inner tank generally coaxially with the central axis of said cylindrical inner tank;
applying over at least a substantial portion of said exterior surface of said inner tank a first spacing material providing for substantially free passage of liquids along a substantial portion of said exterior surface of said inner tank;
applying over said inner tank and said first spacing material an outer sheath of a material that is substantially rigid and liquid-tight with at least a portion of said outer sheath being adjacent to each of said spindle members, and said outer sheath being spaced from at least a portion of said exterior surface of said inner tank by said first spacing material;
removing from said storage tank at least a substantial portion of the length of one of said spindle members from one of said end portions of said inner tank;
urging an end portion of said outer sheath overlying said one end portion of said inner tank away from said one end portion of said inner tank to form a space between said end portion of said outer sheath overlying said one end portion of said inner tank and said one end portion of said inner tank, such that an aperture is created in said end portion of said outer sheath adjacent said one spindle member;
inserting a second spacing material through said aperture and into said space to maintain said end portion of said outer sheath overlying said one end portion of said inner tank spaced from said one end portion of said inner tank;
and
applying over said aperture a second sheath of a material that is substantially liquid-tight.

5 more elements

In a method of making a double-wall storage tank that includes the steps of providing a rigid, single-wall inner tank having generally cylindrical side-wall portion and closed end portions that are transverse to the side-wall portion with elongated spindle members attached to and extending outwardly of the end portions of the inner tank generally coaxially with the central axis of the cylindrical inner tank, applying over at least a substantial portion of the exterior surface of the inner tank a first spacing material providing for substantially free passage of liquids along at least a substantial portion of the exterior surface of the inner tank, and applying over the first spacing material and at least a substantial portion of the inner tank an outer sheath of a material that is substantially rigid and liquid tight, with at least a portion of the outer sheath being adjacent to each of the spindle members and the outer sheath being spaced from at least a portion of the exterior surface of the inner tank by the first spacing material, the improvement comprising the steps of:

removing from the storage tank at least a substantial portion of the length of one of the spindle members from one of the end portions of the inner tank;
urging an end portion of the outer sheath overlying said one end portion of the inner tank away from said one end portion of the inner tank to form a space between the end portion of the outer sheath overlying said one end portion of said inner tank and the end portion of the inner tank, such that an aperture is created in the end portion of the outer sheath adjacent said one spindle member;
inserting a second spacing material through said aperture and into said space to maintain the end portion of the outer sheath overlying said one end portion of the inner tank spaced from said one end portion of the inner tank;
and
applying over said aperture a second sheath of a material that is substantially liquid-tight.

2 more elements

Dependencies are inferred from the claim text.