Abstract: An assembly for supporting the floating roof of a tank is provided that includes a guide fastened to the floating roof, a support leg slidably received in the guide and a locking pin. The guide supports the floating roof when the assembly is in an operating mode. In this mode, the support leg may be withdrawn from the guide. When the support leg is withdrawn, the locking pin is installed coaxial with the vertical axis of the guide, to close the orifice remaining upon removal of the support leg. When the roof is placed in a maintenance mode, the support leg is reinserted in the orifice and the locking pin is passed through aligned orifices of plates rigidly fastened to the top end of the guide. The transverse orientation of the locking pin in the locked mode enables an operator to determine the operating status of the floating roof.

Abstract: The present invention relates to a device which is used in the floating roofs of tanks for storing liquids and is intended to prevent the formation of a vacuum between the stored liquid and the floating roof (5). More particularly, the device of the invention is intended for a liquid storage tank which has operating heights which are much lower than the maintenance height. There are two possible ways in which the device of the invention can operate. When the floating roof (5) is in operating mode and reaches its minimum operating height (FIG. 2), a lower shaft stop (10) of a sliding shaft of the valve comes against a lower stop (8) of the body (2) of the device, causing the device (30) to open. When the floating roof (5) is placed in the maintenance mode, use is made of a locking pin (4) for rigidly fastening the sliding shaft (3) to the body (2) of the device (30), which enables the assembly to open when the floating roof reaches the maintenance height (FIG. 4).

Abstract: The system uses principal radial tubes 4 which connect an inner, central arc 3 to an outer arc 2. A plurality of branches 5 emerge from these tubes 4 and then assume a radial geometry, forming secondary radial tubes which extend as far as the said outer arc 2. The system rests freely on the bottom of the tank.

Abstract: A method for inverting the convex configuration of a liquid-product storage-tank bottom is described for providing greater efficiency in the removal of undesirable materials that normally accumulate on the tank bottom. A layer of material having plastic properties is placed over the conventional tank bottom except for at least one section from the center of the tank base to the edge. The material with plastic properties hardens over time, thus producing a new bottom having a center at a level below the level of the edge. The part over which the material having plastic properties was not placed forms a flow gutter which leads the liquids and sediments which have to be drained off to the edge.

Abstract: This invention relates to a liquid storage system for storing liquid products, particularly petroleum and its derivatives. An auxiliary dam (1) within a bund defined by a main dam (3) bounds an area (5) around a tank (2) in such a way that the contaminating wastes from the fluids stored in the tank are contained within that area (5).

Abstract: A tank for storing liquid products, particularly a large capacity tank 1, comprises a bottom 5, whose center 6, is at a level below the level of the edge of the bottom. Drainage channels 7, consisting of a ramp 8, as floor with lateral plates 10, as sides, bring the undesirable materials to the edge of the tank where they can be drained out of the tank through drainage tubes.

Abstract: The present invention relates to a system which makes it possible to remove undesirable liquids, generally an aqueous phase, which precipitate to the bottom of tanks for storing liquid products. Use is made of a drainage device (30) which comprises a concave body (31), a seat (26), and an interface float (8) which has a plug portion (25). This interface float (8) is designed to sink into the product and to float on the aqueous phase. As the level of the aqueous phase drops, the plug portion (25) settles sealingly on the seat (26), halting the drainage operation since all the accumulated aqueous phase has already been drained off. The drainage system may be automatic or manual. In the former case, use is made of a sensor (12) for detecting the presence of an aqueous phase and commanding the process of opening a shut-off valve (11) and allowing drainage of the accumulated aqueous phase.