Method of making double wall storage tank for liquids from a metal tank having a patterned surface
OwnerDavid T. Palazzoinventor
Life of this patent
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Abstract
A double wall storage tank for liquid and a method for manufacturing that tank are disclosed in which an inner tank is formed of metal panels with at least lower portions of the inner tank being formed from patterned metal having a pattern of projections extending outwardly from a base surface on the exterior such portions of that inner tank, with a sheet of imperforate material stretch over the inner tank to separate the inner tank from subsequently applied sheathing material, and a substantially rigid sheath of resin impregnated fibrous material is applied over that inner tank and sheet.
Claims12
A method of manufacturing a double wall storage tank for storage of liquids, comprising the steps of
- forming a substantially rigid inner tank from metal with at least lower portions of said inner tank being formed from patterned metal having a pattern of projections formed of said metal and extending outwardly from a base surface on at least one side thereof, such that the exterior surfaces of said portions of said inner tank include said projections extending outwardly therefrom;
- stretching over said inner tank and said projections a sheet of imperforate material to separate said inner tank from subsequently applied sheathing material;
- and
- applying over said inner tank exterior and said sheet a substantially rigid outer sheath of a material that is substantially liquid=tight, said sheath being spaced from said inner tank exterior surface by said sheet supported on said projections, whereby is provided a rigid, double wall tank.
A tank for storage of liquids comprising
- a substantially rigid inner tank having means for introducing thereinto and withdrawing therefrom liquids to be stored, said inner tank being formed from metal with at least lower portions of said inner tank being formed from patterned metal having a pattern of projections formed in said metal extending outwardly from a base surface on the exterior of said portions of said inner tank;
- a sheet of imperforate material stretched over said inner tank exterior surface and said pattern of projections extending outwardly from the base surface thereof;
- and
- a substantially rigid outer sheath formed over said inner tank and said sheet of imperforate material, said outer sheath being formed of a resin impregnated fibrous material that is substantially liquid-tight, whereby is formed an outer sheath enclosing the inner tank and being spaced from the base surface of the exterior of the inner tank by the sheet of imperforate material and the pattern of projections.
Dependencies are inferred from the claim text.