RU2364561C1 - Tank with floating block covering for manufacturing operations with petroleum or petroleum products - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to tanks, particularly to floating coating, and relates to tank with floating coating for manufacturing operations with petroleum and petroleum products, containing sealed floats. Tank contains sealed floats. Floating coating is implemented in the form of floating and totally covering surface of liquid blocks, blocks are sealed and implemented in the form of ducts from light-gage material and are filled by rigid foam polymeric material, blocks are connected and by rows are fixed on longitudinal beams, beams are connected by crossties, and at coating circumferential of diametre less than coating diametre, on equidistant distance from perimetre shutter, it is fixed reinforcing ring, consisting of profile top and bottom rings, connected to each other by vertical wall, herewith vertical wall is obstructing barrier of foam.

EFFECT: reliability and strength improvement of floating coating, effectiveness increase of sealing perimetre shutter.

3 dwg

Description

The invention relates to tanks, in particular, equipped with a floating coating.

A technical solution is known (see US patent No. 3861555 from 01/21/75), including tubular floats, supporting beams, metal flooring, risers, a flexible seal at the tank wall.

The disadvantage is the increased volume of gas space between the flooring and the surface of the liquid, insufficient bearing capacity of the peripheral part of the floating coating.

Known floating coating for the tank (see ed. Certificate No. 2127216, MKI B65D 88/34, 1999), containing rows of rectangular floats connected by struts and supporting beams, peripheral floats with a side, a sheet of metal sheet with pressure beams, end bracket for attaching the beams to the side of the floating cover and a flexible sealing shutter.

The disadvantage is the high metal consumption of the floating coating, low bearing capacity and low reliability.

The closest technical solution to the proposed invention is a tank with a floating coating (see RF patent No. 2305654 dated 09/10/2007), containing sealed floats, the floating coating is made in the form of a ring of rigidly connected perimeter and radial beam blocks forming hollow sectors, covered with oil and petrol resistant fabric, the blocks are pulled together by longitudinal and transverse strings forming a grid at the level of the liquid surface, and the fabric coating lies on the strings on the liquid surface, installed on the perimeter blocks There is a sealing shutter between the tank wall and the floating coating; a float valve is installed on the fabric coating.

Disadvantages - poor load-bearing capacity of the fabric coating, depressurization of the perimeter sealing shutter when the perimeter blocks oscillate with the liquid surface and insufficient strength of the floating coating, especially when dynamically exposed to a large volume gas / vapor plug falling under the floating coating from the main pipeline into the tank, increased foaming agent consumption when extinguishing a fire.

The purpose of the invention is to increase the reliability and strength of the floating coating, increase the efficiency of the perimeter sealing shutter, reduce the flow rate of the foaming agent during fire fighting.

The goal is achieved in that:

- to increase reliability and strength, the coating is made of blocks floating on the surface of the liquid, completely covering the evaporation surface, the blocks are connected and fixed in rows on longitudinal beams, the blocks are made in the form of sealed boxes of sheet material, for example aluminum, filled with a rigid foam material, for example polyurethane foam, the beams are fastened together by transverse ties, and at an equidistant distance from the perimeter shutter in a circle with a diameter smaller than the diameter of the coating, replicated stiffening ring, consisting of a metal upper and lower profile rings, for example tubular, interconnected by a vertical wall;

- the stiffness ring of the floating block coating, ensuring the preservation of the annular shape of the coating in the horizontal and vertical planes when the surface and liquid level fluctuates, provides an increase in the sealing efficiency of the perimeter shutter;

- to increase the efficiency of fire extinguishing and reduce the flow rate of the foaming agent solution, the vertical wall of the stiffening ring of the floating block coating is a barrier to the foam coming from the foam generators into the tank to the floating coating, which delays the bulk of the foam in the perimeter shutter area with an open liquid surface.

Figure 1 shows a General view of the tank with a floating block coating in section; in Fig.2 - section 1-1 in Fig.1 - the location of the stiffening ring of the floating block coating, the supply of foam from the foam generators 9 to the coating and holding it in the perimeter gate area by the wall of the stiffening ring 4; figure 3 is a section 2-2 of figure 1 is a view of the stiffening ring and the fastening of the blocks on the longitudinal beams.

The floating block coating is made of blocks 1 floating and completely covering the surface of the liquid, connected and rows fixed on the longitudinal beams 2, the blocks are made in the form of sealed boxes of thin sheet material, for example aluminum, filled with rigid foam material, for example polyurethane foam, the beams are fastened together by transverse ties 3, float valves 13 are located on one or several blocks to release vapor-gas plugs and to prevent the formation of vacuum under the coating when it landing on supports, at an equidistant distance from the perimeter shutter 8 around a circle with a diameter smaller than the coating diameter, a stiffening ring 4 is fixed, consisting of upper 5 and lower 6 metal profile rings interconnected by a vertical wall 7, to seal the vapor of the open surface of the liquid 11 located in the gap between the tank wall and the coating, a sealing shutter 8 is installed around the perimeter of the coating, sliding along the wall of the tank 12.

The tank with a floating block coating works as follows. In the normal position, the blocks of the floating block coating are partially submerged and float on the surface of the liquid, completely, with the exception of the gap between the tank wall and the floating coating, close the evaporation surface. A sealing shutter 8 is installed along the perimeter of the coating to seal the gap.

With a slight surface oscillation from the action of a jet of incoming liquid, the strength and rigidity of the floating block coating without a fixed stiffness ring is sufficient to preserve the annular shape of the perimeter shutter. With a stronger dynamic effect on the coating, for example, when large volumes of vapor-gas plugs are ejected from the main pipeline into the tank, part of the plug volume is discharged through the float valve 13, and part of the bubble, striking from below into the floating coating, lifts it and deforms.

The proposed floating block coating, consisting of blocks made in the form of sealed boxes of sheet material and filled with rigid foam material, the blocks of which are connected and fixed in rows on longitudinal beams, the beams are pulled together by transverse ties, and a stiffening ring is fixed on the blocks, which provides more reliable strength and preservation of the annular shape of the coating and sealing efficiency of the perimeter shutter.

For example, the moment of resistance of a section of a block 900 mm wide, a box height of 42 mm, is made of 0.8 mm thick aluminum sheet, filled with rigid polyurethane foam and fixed on two T-shaped beams with a size of 50 × 50 mm, 4 mm thick and fixed on a block with a stiffening ring, consisting of 40 × 40 annular pipes with a thickness of 2 mm and a wall height of 900 mm, is more than three times higher than the moment of resistance of such a block on the same longitudinal beams, but without a stiffening ring, therefore, overall reliability and strength of the proposed block n avayuschego coating with fixed stiffening ring, respectively, are much higher.

In a fire in a tank, combustion occurs mainly on the open surface of a combustible liquid. After the foaming solution is supplied to the foam generators of the tank 9, the foam 10 enters the floating coating along the tank wall and is held back by the barrier - the wall of the stiffening ring 7 in the combustion zone, preventing it from spreading over the entire coating surface, thereby achieving more effective fire fighting directly from the combustion zone and reducing the foamant consumption .

Claims (1)

A tank with a floating block coating for technological operations with oil and oil products, containing hermetic floats, characterized in that for imparting reliability and strength to the coating, preserving the annular shape when steam and gas plugs are ejected from the main pipeline into the tank, as well as to increase fire fighting efficiency and reduce consumption foaming agent, the floating coating is made in the form of blocks floating and completely covering the surface of the liquid, the blocks are sealed and made in the form of a box made of sheet material and filled with rigid foam material, the blocks are connected and mounted in rows on longitudinal beams, the beams are fastened with transverse ties, and a stiffening ring consisting of profile top is fixed on the surface along a circle with a diameter smaller than the diameter of the coating at an equidistant distance from the perimeter shutter and lower rings interconnected by a vertical wall, while the vertical wall is a barrier barrier foam.

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