RU2302989C1 - Floating roof of vertical reservoir - Google Patents

Abstract

FIELD: construction industry, in particular, floating roofs for preventing petroleum products and other evaporating liquids within reservoirs from evaporation.

SUBSTANCE: floating roof of vertical reservoir has central membrane with annular pontoon, water discharge system and hermetically sealing enclosure rigidly joined with its lower end to annular pontoon and with its upper end to rigidity ring of reservoir wall. Hermetically sealing enclosure consists of a set of rigid rings different in diameter, said rings being sealingly connected with one another by means of flexible annular members. Flexible annular members are attached in succession from inner to outer sides of adjacent rigid rings. Floating roof of such construction allows air-and-gas mixture to be prevented from evaporation beyond vertical reservoir.

EFFECT: increased efficiency in eliminating evaporation of air-and-gas mixtures and enhanced reliability in operation of construction on the whole.

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Description

The invention relates to the field of construction, in particular to structures of a floating roof for protection against evaporation of the surface of oil products and other volatile liquids in tanks.

A vertical tank is known that contains a device for preventing loss of oil products stored in the tank, which is a pontoon floating on the surface of oil products with a sealing device around the periphery and a closed slot, equipped with a flexible elastic insert located above the slot and rigidly connected to the pontoon, and valves for bypassing the gas-air mixtures in the suprapontonic space [1]. The disadvantage of this device is that it does not capture the gas-air mixture when filling the reservoir with a stored product. A partial spread of the gas-air mixture beyond the flexible insert to the periphery of the pontoon is possible, which leads to its unreliable operation.

Known vertical tank with a floating roof, in the form of an elastic shell floating on the liquid contained in the tank [2]. The disadvantage of this technical solution is that the elastic coating is unreliable and short-lived. In addition, elastic materials can be easily damaged during installation.

Known floating roof of the tank, including a conical steel membrane, annular pontoons and reinforced concrete disk, hermetically connected to the edges of the holes of the membrane [3]. The disadvantage of this design is its low operational reliability.

Two-deck floating roofs of reservoirs for storing flammable liquids are known, containing upper and lower decks and radially mounted ribs on the lower deck [4]. However, the service life of such roofs is very limited due to the fact that decks made of metal sheet are intensively corroded by atmospheric precipitation, the removal of which is difficult, despite the existing slope of the upper deck and the presence of a developed system for discharging water into storm sewers.

The closest in technical essence is the floating roof of the tank, containing a central membrane with an annular pontoon, a drainage system and a containment shell, rigidly interfaced with the lower end with an annular pontoon, and the upper end with a ring of rigidity of the tank wall. The containment is made in the form of a flat spiral and a flexible and airtight cylindrical shell placed in it [5]. The disadvantage of such a floating roof is that when a flat spiral is compressed, tight contact occurs between its adjacent elements. When exposed to the product stored in the tank, it is possible to glue the elements of a flat spiral and disrupt the normal operation of the floating roof as a whole.

The objective of the invention is to increase the operational reliability of the floating roof of the tank.

This object is achieved in that the floating roof of the vertical tank contains a central membrane with an annular pontoon, a drainage system and a containment shell, rigidly conjugated with a lower end with an annular pontoon, and the upper end with a stiffness ring of the tank wall, and the containment consists of a set of rigid rings of different diameters, which hermetically interconnected by flexible ring elements, while the flexible ring elements are attached sequentially from the inner to the outer sides of adjacent rigid rings.

Figure 1 presents a structural diagram of a floating roof of a vertical tank in an unloaded tank;

figure 2 presents a structural diagram of a floating roof of a vertical tank in a loaded tank;

in figure 1, 2 are indicated: 1 - the central membrane of the floating roof, 2 - annular pontoon, 3 - drainage system, 4 - hermetic shell, 5 - stiffening ring, 6 - tank wall, 7 - rigid rings, 8 - flexible ring elements, 9 - guides, 10 - the inner side of the rigid ring, 11 - the outer side of the rigid ring.

The floating roof of the vertical tank contains a Central membrane 1 with an annular pontoon 2, a drainage system 3 and a containment 4 (figure 1 and figure 2).

The containment 4 consists of rigid rings 7, interconnected by flexible ring elements 8, attached sequentially from the inner 10 to the outer 11 sides of adjacent rigid rings (figure 3). The containment 4 is hermetically fixed with the lower edge around the perimeter of the pontoon 2, and the upper edge is also hermetically fixed around the perimeter of the stiffening ring 5 of the tank wall 6.

Rigid rings 7 can be made of sheet metal, and flexible ring elements 8 can be made of synthetic fabric.

The floating roof of the vertical tank works as follows: when the tank is unloaded from oil products as much as possible, the central membrane 1 of the floating roof together with the pontoon 2 are in the lowest position, and the containment 4 is maximally stretched (Fig. 1). In this case, the rigid rings 7 of the containment 4 are in suspension and are held by flexible ring elements 8.

When loading the tank with oil to the maximum level (figure 2), the Central membrane 1 and the pontoon 2 float. The rigid rings 7 are lowered onto the pontoon one after another, and the flexible ring elements 8 are stacked in the space between them. When the tank is as full as possible, the containment 4 is compressed (Fig. 4).

The proposed design of a floating roof of a vertical tank, including a containment 4, consisting of rigid rings 7, tightly interconnected by flexible ring elements 8, can completely eliminate the evaporation of the gas-air mixture outside the vertical tank and generally increase the operational reliability of the structure.

Information sources

1. A.S. USSR No. 601199, Cl. B65D 87/18, 1976.

2. A.S. USSR No. 291021, Cl. E04H 7/18, 1968.

3. A.S. USSR No. 563469, Cl. E04H 7/02, B65D 87/18, 1968.

4. German patent No. 893916, Cl. 81 e, 143, 1949.

5. RF patent No. 38736 U1, IPC 7 B65D 88/48, 7 B65D 88/34, 2004.

Claims (1)

A floating roof of a vertical tank containing a central membrane with an annular pontoon, a drainage system and a containment, rigidly conjugated with a lower end with an annular pontoon, and an upper end with a stiffening ring of the tank wall, characterized in that the containment consists of a set of rigid rings of different diameters that are hermetically connected between each other with flexible ring elements, while the flexible ring elements are attached sequentially from the inner to the outer sides of adjacent rigid rings.

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