RU2375280C1 - Vertical reservoir for volatile liquids storage - Google Patents

Abstract

FIELD: packing industry.

SUBSTANCE: reservoir comprises one or two pipe headers, a manhole, a branch pipe with a gate valve for the concentrate discharge, breathing and safety valves, a branch pipe for level controller setting, an elastic shell with its lower side of the central part being fitted by a shaped tip with axial and radial channels and a float valve to release the gas-and-air mixture, a float made as a torus and filled by air. The elastic shell is hermetically fixed along the casing inner perimetre between two angle rings set in the middle part of the reservoir with the inclination of 1-2° to the horizontal plane. The upper angle ring is made with flanged edges forming a chute for the condensate discharge. Holed vertical poles are mounted between the reservoir roof and the upper angle ring and are rigidly fixed on the reservoir casing with a gap between the lower end face of the poles and the upper angle ring.

EFFECT: increased reliability and longer service life of the reservoir due to providing for the conditions of discharging the condensate formed during long oil product storage from the upper surface of the elastic shell and the inner surface of the upper part of the reservoir casing.

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Description

The invention relates to means for storing liquids, mainly to vertical tanks for storing volatile oil products, and can be used in chemical, petrochemical, oil refining and other industries.

Known reservoir for storing petroleum products containing nozzles of the entrance and exit of petroleum products. The inner surface of the tank is protected by a film, the upper part of which is equipped with a float with a nozzle for injecting inert gas and a valve for venting the vapor-air mixture, and the lower part is equipped with a mounting plate for fixing the film to the wall of the tank and a visor installed above the oil pumping pipe and preventing the protective film from being drawn in during pumping oil product. (RU No. 2256594 C2, class B65D 88/34, ЕНН 7/02, 07/20/2005).

The disadvantage of this tank is that during its operation due to fluctuations in the daily temperature, condensate accumulates over the upper part of the protective film, which cannot be drained. Accumulated condensate with oil vapor forms a corrosive mixture, causing accelerated corrosion of the roof and upper part of the tank body.

Closest to the claimed invention in technical essence is a reservoir for storing volatile liquids, containing a delivery nozzle, breathing and safety valves and an elastic shell fixed to the inner perimeter of the body with a central hole and a shaped nozzle with a float valve for discharging a gas-air mixture. Coaxially to the central hole of the elastic shell, a float made in the form of a torus is fixed. An elastic shell is fixed between two corner flanges installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane. At the lower point of the upper corner flange there is a pipe for condensate drain (RU 2338678, class B65D 88/34, 03.16.2007 - prototype).

The disadvantage of this tank is that in a completely filled tank, the elastic shell is firmly pressed against the tank body and during long-term storage of the liquid, due to daily temperature fluctuations, pressure changes over the elastic shell and the operation of the breathing valve over the upper part of the shell, condensation accumulates, causing increased corrosion roof and top of the tank body.

The technical result of the invention is to increase the reliability and service life of the tank by creating conditions for condensate to drain from the upper surface of the elastic shell and the inner surface of the upper part of the tank body formed during long-term storage of the oil product.

This technical result is achieved in that a vertical reservoir for storing volatile liquids, containing a receiving nozzle and a manhole located in the lower part of the housing, breathing and safety valves on the roof of the reservoir, an elastic shell, on the inside of which a float in the form of a torus, enclosing a figured a nozzle with an axial channel and radial channels coaxial with the central bore of the elastic shell, below which a float valve is fixed to discharge the gas-air mixture and from under an elastic shell fixed between two corner flanges installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane, and a condensate drain pipe located at the lower point of the upper corner flange made with flanging, according to the invention, the tank additionally contains at least four perforated vertical racks located in the annular gap between the inner wall of the tank body and the elastic shell and equally spaced from each other along the perimeter The distance, wherein the vertical supports are rigidly fastened to the wall of the tank body between the roof and the upper angled flange to form a gap between the lower end of upper racks and angled flange, whose magnitude does not exceed the height of the upper flanging of the flange.

Figure 1 shows a vertical sectional storage tank for volatile liquids;

figure 2 is the same (view aa in figure 1);

figure 3 is the same (node A in figure 1);

in Fig 4 is the same (node B in Fig 1).

The vertical reservoir for storing volatile liquids consists of a housing 1, a bottom 2 and a roof 3. In the lower part of the housing 1 there is a receiving and distributing nozzle 4 (one or two) and a manhole 5, and in the middle part there is a nozzle 6 with a valve 7 for condensate drain . On the roof of the tank there is a breathing valve 8, a safety valve 9 and a pipe 10 for mounting the level control device. Inside the tank there is an elastic shell 11 made in the form of a glass. In the central part of the shell 11, a figured nozzle 12 is fixed on the lower side, which acts as a float valve for discharging a gas-air mixture, and a toroidal float 13.

The elastic shell 11 is hermetically fixed between two corner flanges 14 and 15, which are installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane. The upper corner flange 15 is flanged and forms a tray along which condensate flows to the nozzle 6. On the inner surface of the tank body 1 from the upper corner flange 15 to the cover 3, at least four perforated vertical posts 16 are rigidly fixed to drain the condensate from the surface of the elastic shell and the inner surface of the upper part of the tank body. Racks are removed from each other along the perimeter at an equal distance.

Perforated vertical posts 16 are made of steel sheet with a smooth curve of the bending angle. The upper part of the perforated vertical struts 16 is located above the maximum filling level of the tank, and the lower part is set with a gap relative to the upper corner flange 15, the size of which does not exceed the flanging height of the flange 15. This arrangement of the vertical struts 16 provides condensate drain from the surface of the elastic shell 11 and from the inside the surface of the upper part of the tank body to the upper corner flange 15 and further to the pipe 6.

The tightness of the fastening of the elastic shell 11 between the corner flanges 14 and 15 is provided by the gasket 18.

The shaped nozzle 12 has a flange 19 for attaching to the elastic shell 11 coaxially with its central hole 20 and a flange 21 for attaching the protective casing 22.

Inside the curly nozzle 12, a stepped axial channel 23 and radial channels 24 and 25 are made.

Below the radial channels 24 and 25, a float valve is installed, consisting of a stem 26 and seals 27 located in a stepped axial channel 23 of large diameter. The rod 26 is rigidly connected to the float 28.

The flange 18 of the shaped nozzle 12 is mounted on an elastic shell 11 having a central hole 20, using a flange 29 and a bolted connection.

The float 13 of the elastic shell 11 is fixed to the shell 11 in several places with glue. It holds the central part of the elastic shell 11 with the curly nozzle 12 afloat.

As a material for the manufacture of elastic shell 11 can be used gas-resistant rubber-fabric or synthetic materials.

To measure the level of oil in the tank, known level gauges are used, for example, a commercially available radar level gauge of the RVR-102 or RVR-102A brand of the Saturn scientific and production enterprise, which can be installed on the nozzle 10 located in the center of the roof 3 of the tank.

In order to limit the intensity of ventilation of the volume of air located between the roof 3 of the tank and the elastic shell 11, and, consequently, to reduce the amount of condensate released from this volume of air, the well-known breathing 8 and safety 9 valves are installed on the roof 3 of the tank.

The tank is operated as follows.

Before filling the tank with oil, the middle part of the elastic shell 11 is located on the bottom 2 of the tank. In the process of filling the tank, the elastic shell 11 pops up and rises with the oil. The air inside the tank above the elastic shell 11 is displaced through the breathing valve 8 into the atmosphere. A small amount of air, which was before filling between the bottom of the tank 2 and the elastic shell 11, especially at the interface between the body 1 and the bottom 2, in the process of filling the tank is collected under the elastic shell 11 in its central part at the location of the mountain float 13 and leaves - under the shell into the airspace above the shell through the float valve of the curly nozzle 12. During storage of the oil product at a filling level above the average and especially when the tank is completely filled The condensate formed above the elastic shell drains into the tray of the upper corner flange 15 along the perforated vertical posts 16, which also allow the tightness of the elastic shell 11. The drained condensate is visually checked for the presence of oil products in it.

The filling height of the tank with oil is controlled using the well-known level meters RVR-102 or RVR-102A.

Thus, during the operation of the tank, condensate formed above the elastic shell and on the inner surface of the upper part of the tank body drains along the perforated vertical racks into the tray of the upper corner flange 15 and is periodically drained through the pipe 6 and valve 7, which reduces the corrosion process of the upper part tank body, increase reliability and extend its life

Claims (1)

A vertical tank for storing volatile liquids, containing a receiving nozzle and a manhole located in the lower part of the body, breathing and safety valves on the roof of the tank, an elastic shell, on the inside of which a float is fixed in the form of a torus, covering a shaped nozzle with a coaxial central opening of the elastic shell an axial channel and radial channels, below which a float valve is fixed for discharging the air-gas mixture from under the elastic shell fixed between two corner flanges installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane, and a condensate drain pipe located at the lower point of the upper corner flange, made with flanging, characterized in that the tank additionally contains at least four perforated vertical racks located in the annular gap between the inner wall of the tank body and the elastic shell and spaced apart along the perimeter for an even distance, while the vertical racks are rigidly akrepleny on the wall of the tank body between the roof and the upper angled flange to form a gap between the lower end of upper racks and angled flange, whose magnitude does not exceed the height of the upper flanging of the flange.

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