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A spacerless double bottom apparatus for a storage tank having a metal bottom and upwardly extending metal sidewalls. The apparatus includes a first lining layer of flexible plastic on top of the metal bottom. A plastic grid having a plurality of openings therethrough is installed on top of the firs

A spacerless double bottom apparatus for a storage tank having a metal bottom and upwardly extending metal sidewalls. The apparatus includes a first lining layer of flexible plastic on top of the metal bottom. A plastic grid having a plurality of openings therethrough is installed on top of the first lining layer. At least one layer of fiber insulation is installed and resides on top of the grid. An upper metal bottom on top of the fiber insulation is welded to the sidewalls to form a fluid tight secondary containment compartment.

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What is claimed is: 1. A spacerless or geocomposite double bottom apparatus for a storage tank having a metal bottom and upwardly extending metal sidewalls, which apparatus comprises: a first lining layer of flexible plastic on top of said metal bottom; a plastic grid having a plurality of openings

What is claimed is: 1. A spacerless or geocomposite double bottom apparatus for a storage tank having a metal bottom and upwardly extending metal sidewalls, which apparatus comprises: a first lining layer of flexible plastic on top of said metal bottom; a plastic grid having a plurality of openings therethrough on top of said first lining layer; at least one layer of fiber insulation on top of said grid; and an upper metal bottom on top of said fiber material welded to said sidewalls wherein said upper bottom extends through slots in said sidewalls and is welded thereto by welding to a flat bar extending from said sidewalls. 2. A double bottom apparatus as set forth in claim 1 wherein said first lining layer is a high density polyethylene sheet. 3. A double bottom apparatus as set forth in claim 1 wherein said plastic grid is composed of high density polyethylene. 4. A double bottom apparatus as set forth in claim 1 wherein said fiber insulation is mechanically bonded mineral or glass wool. 5. A double bottom apparatus as set forth in claim 4 including two layers of said mechanically bonded mineral or glass wool. 6. A double bottom apparatus as set forth in claim 1 wherein all welds are made from above said upper bottom. 7. A double bottom apparatus as set forth in claim 1 including a leak detection port through said sidewalls between said original bottom and said upper bottom. 8. A double bottom apparatus as set forth in claim 6 wherein said leak detection port includes a clear cylindrical tube so that fluid therein is visible. 9. A double bottom apparatus as set forth in claim 1 wherein a fluid tight containment space is created between said upper bottom, said sidewalls, and said first lining layer. 10. A double bottom apparatus as set forth in claim 9 wherein said fluid tight containment space is purged of oxygen. 11. A double bottom apparatus as set forth in claim 10 wherein said lining layer is fastened to said metal bottom by a plurality of fasteners. 12. A double bottom apparatus for a storage tank as set forth in claim 1 including a sealant between said first lining and said sidewalls. 13. A spacerless or geocomposite double bottom apparatus for a storage tank having a metal bottom and upwardly extending metal sidewalls, which apparatus comprises: a first lining layer of flexible plastic on top of said metal bottom; a plastic grid having a plurality of openings therethrough on top of said first lining layer; at least one layer of fiber insulation on top of said grid; and an upper metal bottom on top of said fiber material extending through slots in said sidewalls and welded thereto by welding to a flat bar extending from said sidewalls.