RU2596120C1 - Tank with floating block coating and packed foam glass for technological operations with oil or oil products - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to tanks for technological operations with oil and oil products, equipped with floating block coating, completely covering liquid surface with sealed units and perimeter stopper. On the coating of the tank along the perimeter closely to perimeter stopper there is a fixed annular section box with packed granulated cellular glass, top part of which is reticulate and is higher than the perimeter of the gate and faces it, and foam glass is in sealed packages made from low-melting oil-and-petrol resistant material, upon that annular box, that is a carrier of packaged foam glass for automatic extinguishing of the flame in the center of ignition, is also a ring of strength and guard barrier for liquid discharge and for fire-fighting foam.

EFFECT: technical result of device is increased efficiency of fire extinguishing, high strength of coating and reduced area of contamination of the flammable liquid coating.

1 cl, 3 dwg

Description

The invention relates to tanks for technological operations with oil and oil products equipped with a floating block coating.

Known pontoon for vertical cylindrical tanks for storing oil and petroleum products (see RF patent No. 2053176 from 01/27/1996), including a block coating, a perimeter sealing shutter and a mounting unit for the shutter to the coating. The attachment site consists of vertical stiffeners, the bases of which are attached to the carpet, and the side wall to an arcuate flexible shutter plate.

The disadvantage is that there is no effective fire extinguishing means - granular foamglass, a barrier of foam and a combustible liquid polluting the surface of the coating when gas and air plugs are emitted from the main pipeline into the tank, insufficient strength of the perimeter of the pontoon.

Known pontoon (see RF patent No. 2219117 of 03/27/2002) comprising a block coating and a perimeter gate, consisting of an arcuate plate with a base and a sealing element made of elastic polyurethane.

Disadvantage - there is no effective fire extinguishing means - granular foamglass, a perimeter barrier to reduce pollution of the coating surface with liquid during gas-air plug emissions from the pipeline into the tank and to hold foam when the foam fire extinguishing system is triggered, insufficient strength of the perimeter part of the coating from the dynamic effect of the gas-air plug when it emerges and hit the pontoon.

The closest technical solution to the proposed invention is a tank with a floating block coating for technological operations with oil and oil products (see RF patent No. 2364561), containing a floating coating completely covering the surface of the liquid, consisting of sealed blocks made in the form of boxes filled with rigid foam material , on the coating around the circumference with a diameter smaller than the diameter of the coating at an equidistant distance from the perimeter shutter installed ring stiffness, consisting e from the upper and lower rings connected by a vertical wall, which is both a barrier barrier foam.

Disadvantages - insufficient strength of the perimeter part of the coating provided by a stiffening ring located at a distance from the perimeter shutter, pollution due to emissions of gas-air plugs from the main pipeline into the tank through the perimeter shutter, with a combustible coating liquid in the ring between the perimeter shutter and the stiffness ring, which can serve as a source of ignition , as well as insufficient fire extinguishing of the open surface of the liquid in the ring between the wall of the tank and the coating If the foam fire extinguishing system fails, for example, at low temperatures and freezing of liquid in the foam conduit.

The purpose of the invention is to increase the efficiency of fire fighting, reducing the area of contamination of a coating surface with a combustible liquid and increasing the strength of the coating from the dynamic effects of gas-air plugs falling from the main pipeline into the tank.

The goal is achieved by the fact that:

- to increase the efficiency of fire extinguishing, an annular profile box with granular foamglass is fixed on the perimeter of the coating, the upper part of which faces the perimeter shutter and is higher than the level of the shutter, is mesh, and the foamglass is in packages made of fusible oil and petrol resistant material;

- to reduce the area of contamination of the surface of the coating during the discharge of gas-air plugs into the tank, the annular profile box is fixed close to the perimeter shutter, and the bags with granular foam glass are made of oil and gas resistant material;

- to increase the strength of the coating from dynamic effects during the ascent and impacts of the pontoon emerging from the perimeter shutter of gas-air plugs, the perimeter profile box, which is also a strength ring, is fixed to the coating close to the perimeter shutter.

In FIG. 1 shows a General view in section of a tank with a block coating, a perimeter shutter and an annular profile box with packaged granular foam glass;

in FIG. 2 is a cross-sectional view of an annular profile box, for example, a “V” -shaped profile mounted on a coating;

in FIG. 3 is a cross-sectional view of an open liquid surface filled with granular foamglass in the ring between the tank wall and the coating.

In FIG. 1 schematically shows the discharge of the gas-air plug - 12 into the tank from the main pipeline - 13, the supply of foam - 11 through the foam generator - 10 and its retention, retention by the annular profile box - 6 liquid involved gas-air plug - 15.

The liquid - 5 in the tank is completely covered by a coating of sealed blocks - 4, with the exception of the annular gap between the wall of the tank - 1 and the coating - 4. A perimeter shutter - 2 with a sealing element - 3 is located above the open surface of the liquid - 14. Ring profile box - 6 , for example, a “V-shaped profile, fixed to the cover - 4 close to the perimeter shutter - 2. The upper part of the box wall, located above the shutter and facing the shutter, is mesh - 7. Granular foam glass - 9 is in packages - 8.

The tank with a floating block coating and packaged foam glass works as follows.

In the normal operating position, the sealed granular foamglass in bags of fusible oil and petrol resistant material is located in the annular profile box on the coating.

The main source of ignition is the open surface of the liquid under the shutter. With the occurrence of a flame in the source of ignition, from the flame temperature, the fusible material of packages, for example, from polyethylene at a temperature of 100-110 degrees, melts and granular foam glass wakes up on the shutter with the open surface of the liquid extinguishing the flame. An automatic extinguishing of the source of fire occurs without human intervention. Coating the burning surface of oil with a layer of granular foam glass of about 50 mm extinguishes the flame power by 90-95%, and a layer of about 100 mm completely extinguishes the flame. In tanks for storing oil and oil products, the gap between the wall of the tank and the coating is about 200 mm, the required volume of foam glass per 1 meter of shutter 0.2 × 0.1 × 1 = 0.02 cubic meters, or, for example, for the tank RVSP-20 000 with a diameter of 45.6 meters requires about 3 cubic meters of packaged granular foam glass.

When a gas plug is ejected from the main pipeline into the reservoir and it is ascended, a powerful blow occurs from below into the perimeter of the block coating and then the gas-liquid emulsion is ejected vertically upward through the perimeter gate along the reservoir wall.

Falling back, the liquid enters the upper part of the box, for example, a “V” -shaped profile, and flows along the wall of the box between the packets into the gap between the tank wall and the coating without contaminating the coating surface with a combustible liquid - a potential source of ignition.

When the existing foam extinguishing system of the tank is activated, the foam from the foam generator - 10 enters the coating along the tank wall and is retained by the wall of the shaped box - 6, the foam is sent directly to the zone of the fire source, the profile box acts as a barrier.

To increase the strength of the coating, an annular profile box is installed on the edge of the block coating of the tank close to the perimeter shutter directly in the zone of maximum dynamic impact on the coating of the gas-air plug. Such an arrangement of the annular profile box at the same moment of resistance of the section of the box and, for example, the section of the stiffening ring with a vertical wall located at an equal distance from the perimeter shutter, increases the strength of the block coating.

Claims (1)

A tank with a floating block coating and packaged foamglass for technological operations with oil and oil products, containing a completely covering surface of the liquid, a coating of floating hermetic blocks and a perimeter shutter, characterized in that for fire fighting efficiency, imparting strength to the coating and reducing the area of contamination with a combustible liquid of the coating surface at ejection of gas-air plugs from the main pipeline into the tank, on a floating coating along the perimeter close to the perimeter An annular profile box with packaged granular foamglass is fixed to the shutter, the upper part of which, above the perimeter shutter and facing the shutter, is mesh, and the foamglass is in sealed bags made of low-melting oil and gas-resistant material, while the annular duct is a carrier of packaged foamglass for automatic extinguishing the flame in the fire, at the same time it is a ring of coating strength and a barrier for the discharge of liquid and for ivopozharnoy foam.

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