Patent ID: 7275651

Claim:
An enclosed, regularly transportable, tank system for transporting and providing liquid cargo of significant capacity of at least about one hundred and fifty gallons of the industrial, heavy-duty type for transporting-hazardous and flammable liquids and the like, by offshore/inshore vessels and trucks, as well as other transportation means, and the like, providing relatively safe transportation of the liquids, comprising: a inner fluid containing tank member made up of a top, interior wall member, two, interior, side wall members, a bottom, interior wall member, and two, interior end members, comparable to said interior side wall members but of a lesser width, collectively together forming a first, interior, tank “skin” capable of holding liquid, and a comparable but slightly larger, outer, enclosing, protective member, likewise made up of an exterior top wall member, two, exterior, side wall members, an exterior, bottom wall member, and two, exterior, end wall members, comparable to said side wall members, collectively together forming a second, exterior “skin,” substantially completely enclosing the interior, tank “skin” producing a double wall tank structure, with the respective members of the two, tank “skins” being generally separated by gaps, except at their respective bottom members, which are at least in substantial part in face-to-face engagement, being flat one on top of the other with substantially no spacing between them; at least one fill opening extending through both of said top wall members down to the interior of the tank and, with an openable fill cap, also extending above said top wall member of said outer “skin,” said fill opening being usable for introducing liquids into said tank interior and, when desired, filling the tank; a continuous, encircling wall extending up from the top wall member completely surrounding said fill opening, said encircling wall containing and preventing the uncontrolled escape of liquid that might be spilled during the filling operation through said fill opening; and a liquid level gauge measuring the amount of liquid in the tank located adjacent to but laterally spaced from said fill opening and in juxtaposition to one side of the tank, said encircling wall initially forming most of a circle but then having a radially, laterally extended extension in which area said liquid level gauge is located at least in part, while said fill opening is located in the area defined by the circle part of said encircling wall.