Tank construction with double bottom, and method of its manufacture

USRE33421E · kind E · reissue

Assignee

• Adisa Entwicklungs AG · CH

Inventor

• Werner Bachmann · Hersbruck, DE

Key dates

• Filing date: Sep 29, 1988
• Grant date: Nov 6, 1990
• Expiry date: Sep 29, 2008

Classification

• Technology area (CPC —): General

Abstract

To form a substance supported inner wall of a double-wall bottom and portion of the side wall of a tank, the inner wall is formed by a ridged, ribbed, puckered or embossed aluminum foil of, for example, 0.15 mm to 0.3 mm, preferably about 0.2 mm thickness, with protrusions or projections extending towards the outer or bottom wall. Since such foils are not available in sizes sufficient to lay out an entire tank in one unit, a plurality of foil units are placed adjacent each other, preferably with edge zones overlapped, and the overlap is bridged and connected by a fiber reinforced ribbon or tape, preferably glass fiber, the thus formed bottom wall being coated with an epoxy resin in which the glass fiber reinforced ribbon or tape is embedded. The tensile strength at the junctions is higher than the tensile strength of the foil units themselves, the plastic coating being present merely to embed the ribbon or tape fibers, retain it in position, and additionally provide a protective layer to protect the aluminum against attack from contents of the tank, but contributing little to the holding strength of the inner or top layer of the bottom wall, since the plastic layer then need be of …