RU2529212C1 - Metal vertical cylindrical reservoir with double bottom for storage of liquid products - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: in reservoir between the main bottom and an additional vertical wall there is a flat circular element and a thin elastic distributing gasket. Stiffening ribs are welded to an additional vertical wall, normally to its surface, and also to edges of the main and additional bottom.

EFFECT: increased reliability and durability of reservoir.

2 dwg

Description

The invention relates to the field of construction, in particular to supporting structures for tanks, and can be used in the oil and refining industries to equip various types of tanks in order to reduce product losses and protect the environment.

In the practice of operating various types of containers for storing liquid products, destruction occurs that leads to leaks, environmental pollution, and in some cases to explosions and fires. The damage caused to the ecology of the region and the material part is very significant. Therefore, leading organizations are developing a number of technical solutions aimed at improving the reliability of tank structures and minimizing damage in case of destruction.

Practice shows that the destruction of reservoirs mainly occurs along welds connecting thin sheets of horizontal bottom elements with a vertical wall. It is here that the maximum bending (morning) moment and, accordingly, the maximum stresses arise. In addition, as a result of inaccurate installation of the main wall with the bottom, destruction (cut) of the seam of the edge or the main sheet of the bottom may occur if there is no edge. Therefore, this knot is subjected to amplification.

Known designs of tanks with a double bottom, containing a vertical wall of the housing, a roof, a main bottom, an additional bottom, as well as a drainage system of the product. Such designs are described in the American Petroleum Institute standard / API 650 appendix I-undertank leak detection and subgrade protection 4. www.techstreed.com/API/standards/API/std_650product_id=1503605)/.

In this technical solution, the bottom of the tank is made of two parallel horizontal sheets, between which an absorber of sand, small gravel or similar material is placed (hereinafter, the term - geocomposite). In case of destruction, the resulting product is absorbed by the absorber and does not enter the environment. A monitoring system is provided that signals the occurring leaks and allows timely measures to be taken to ensure safety.

In such a design, it is difficult to combine the main and additional walls during installation, which leads to additional stresses not taken into account in the calculation, which reduce the reliability of the structure.

A technical solution of a reservoir with a geocomposite double bottom is known, comprising a vertical sheet of the body, a main bottom, a protective bottom, an additional vertical wall and a horizontal annular supporting sheet installed near the upper end of the additional vertical wall, a drainage and leakage alarm system of the main bottom / US No. 5522340, B65D 90/02, 2008.03.18 www.patentgenius.com/patent7344046.html/. This decision was made as a prototype, as the closest both in technical essence and in the set of basic elements.

The disadvantages of this technical solution are high stresses in the seam of the connection of the main bottom with an additional vertical wall due to its insufficient rigidity, which reduces the reliability of the structure and limits its durability. The horizontal annular support sheet is designed so that the seams of fastening of the elements of the main bottom and the additional vertical wall are carried out in the lower position. This design is inefficient, since normal stresses from vertical loads will be transmitted by the contact of the elements, and shear stresses will be transmitted by the first seam. The second seam performs only secondary tasks and, in practice, only increases the cost and complexity of the installation technology.

The aim of the proposed technical solution is to increase the rigidity of the additional vertical wall connecting the horizontal sheets of the main and additional bottom. This will reduce the strain arising under the influence of operational loads, including its own weight, and, accordingly, will increase the reliability of the structure.

The essence of the invention is to increase the reliability and durability of the design of the tank, as well as simplifying the installation technology of the structure.

The technical result consists in increasing the reliability and durability of the reservoir design by increasing the rigidity of the connection node of the main and additional vertical walls, as well as reducing the uneven transmission of forces arising from inaccurate installation.

The technical result is achieved by the fact that the known device of a vertical cylindrical tank with a double bottom for storing liquid products, containing a main vertical wall of the housing, a main bottom, an additional bottom, an additional vertical wall, a thin insulating pad located on an additional bottom, on top of which a geocomposite aggregate is laid, drainage and leakage alarm system, additionally contains a flat ring element, which is welded to the end surface tion of the vertical wall, ribs and a thin elastic junction gasket disposed between the flat ring member and the main bottom. In this case, the stiffeners are welded to the additional vertical wall normally to its surface and to the edges with a step of at least twice the height of the additional vertical wall, and the thin elastic distribution strip is made of heat-resistant material.

A flat ring element is installed between the main bottom and the additional vertical wall, and a thin elastic distribution gasket is placed on it. At the same time, a thin elastic distribution gasket must be made of heat-resistant material, which must withstand the elevated temperatures that occur when performing a welded joint, it can be Teflon or similar material 1-1.5 mm thick. Stiffeners are welded to an additional vertical wall, normal to its surface, as well as to the edges of the main and additional bottom. At the same time, due to the inclusion of a flat ring element in the work, the load transfer area increases, which reduces the voltage arising on the contact. The installation of stiffeners increases the rigidity of the additional vertical wall, which increases its stability. In addition, these ribs provide stability and flat ring element. A thin elastic distribution strip allows for more uniform load transfer and compensates for installation inaccuracies.

The design of the proposed support node is shown in figure 1, figure 2 shows a cross section. The following designations are used here: 1 - main vertical wall, 2 - main bottom, 3 - additional vertical wall, 4 - additional bottom, 5 - thin insulating gasket (polyethylene or similar material), 6 - geocomposite aggregate (crushed stone, sand), 7 - flat annular element, 8 - thin elastic distribution gasket, 9 - stiffener.

A distinctive feature of the proposed technical solution is that the vertical load from the overlying reservoir structures, snow load in winter, are transferred to the additional vertical wall 3 through a flat ring element 7 and a thin elastic distribution strip 8, and the stiffeners 9 are welded to the additional vertical wall 3 normal to its surface and outskirts.

The positive effect is that due to the inclusion in the work of the flat ring element 7 increases the transmission area of the load, which reduces the voltage arising on the contact. The installation of stiffeners 9 increases the rigidity of the additional vertical wall 3, which increases its stability. In addition, these ribs provide stability and the flat ring element 7. Thin elastic distribution strip 8 allows for more uniform load transfer and to compensate for installation inaccuracies.

Installation of tank structures has no features and is performed in the usual manner. Installation is carried out in the following sequence:

- preparation of the surface of the base;

- laying and welding of sheets of the additional bottom 4;

- installation of the shells of the additional vertical wall 3 with welded elements of a flat annular element 7;

- filling the geocomposite aggregate 6 onto a thin insulating pad 5 located on the additional bottom 4;

- laying a thin elastic distribution strip 8 on a flat annular element 7;

- laying and welding of sheets of the main bottom 2;

- installation of the shells of the main vertical wall 1;

- welding to an additional vertical wall 3 is normal to its surface and to the edges of the stiffeners, the pitch of which depends on the size of the tank and is determined by calculation.

The proposed technical solution ensures the overall operational reliability of the tank, reduces the costs of operation and maintenance as a whole due to the ease of installation and eliminates the risk of environmental pollution by the storage product.

Claims (1)

A metal vertical cylindrical tank with a double bottom for storing liquid products, containing the main vertical wall of the body, the main bottom, additional bottom, additional vertical wall, a thin insulating gasket located on the additional bottom, on top of which a geocomposite aggregate, drainage and leakage alarm system, differing the fact that it further comprises a flat annular element, which is welded to the end surface of the additional vertical wall, stiffening sconces and a thin elastic distribution gasket located between the flat annular element and the main bottom, and the stiffening ribs are welded to the additional vertical wall normally to its surface and to the edges with a step of at least twice the height of the additional vertical wall, and the thin elastic distribution gasket is made of heat-resistant material.

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