RU2338678C1 - Reservoir for storage of easily-evaporating liquids - Google Patents

Abstract

FIELD: container.

SUBSTANCE: reservoir contains one or two intake-distribution branch pipes, respiratory and protective valves and elastic cover, in central part of which from the lower side coaxially to its central hole figured nozzle with float valve for release of gas-air mixture from under elastic cover is installed. Elastic cover has a float, made in form or torus, filled with air. Elastic cover is hermetically fixed along reservoir perimeter between two angle flanges, which have inclination 1-2° to horizontal plane. Angle flange is made with flanging, and serves as chute for condensate discharge, for which its lower point is joined to additional branch pipe of reservoir case. Figured nozzle is fixed to elastic cover and had flange for fixation of protective casing, inside which float valve is located. Radial canals, made in figured nozzle, in process of use when float is moving, are blocked by rod, located in stepped axial canal of large diameter.

EFFECT: allows increasing efficiency of reservoir use.

3 dwg

Description

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

Known vertical cylindrical tank for storing light petroleum products, containing a delivery pipe (one or two), breathing and safety valves. (G.A. Pektemirov. Reference book of an engineer and technician of oil depots, - M .: Publishing house of oil and mining and fuel literature, 1954, p.62).

The disadvantage of this tank is the significant inevitable loss of oil during large and small breaths and, as a result, environmental pollution.

A known tank for storing light petroleum products containing a floating roof, consisting of a Central membrane with an annular pontoon and a drainage system. The floating roof is equipped with horizontal stops and a cylindrical hermetic shell absolutely flexible in the vertical and horizontal directions, hermetically fixed by the lower ring around the entire perimeter of the pontoon, and the upper end along the entire perimeter of the upper stiffening ring of the vertical wall of the tank. The germ shell has a hyperbolic surface due to equipping it in the middle part of the ring with a horizontal cavity equipped with an annular spring element that allows the shell to fold in the horizontal direction. The germ shell over the entire surface is reinforced at an angle of 45 ° to the vertical with inextensible and absolutely flexible fiberglass threads.

The disadvantage of this design of the floating roof is the high material consumption of the shell itself and the complexity of its manufacture.

Closest to the claimed invention in technical essence is a reservoir for storing petroleum products containing oil inlet and outlet pipes, an internal elastic shell, the upper part of which is equipped with a float with a fitting for pumping inert gas and a valve for venting the air-vapor mixture. The lower part of the shell is mounted on a flange in the lower part of the tank body. A visor is installed above the oil discharge pipe, which prevents the shell from being drawn into the pipe when the oil is drained. (RU P No.2256594 C2, Cl. 65D 88/34, ЕНН 7/02, 2005).

The disadvantage of this design of the tank is the large consumption of elastic shell, because it is mounted in the lower part of the tank, the impossibility of draining the condensate formed above the shell and in the gaps between the tank body and the shell both during the filling of the tank and during storage of the oil product, and the inability to control the tightness of the elastic shell during operation.

The technical result of the invention is to increase the efficiency of operation of the tank by creating conditions for the drainage of condensate formed above the shell and between the shell and the housing, while ensuring the control of the tightness of the elastic shell.

This result is achieved by the fact that the reservoir for storing volatile liquids containing the receiving nozzle located in the lower part of the housing, breathing and safety valves and an elastic shell fixed along the inner perimeter of the housing with a float and a central opening connected to the valve for discharging the gas-air mixture from under the elastic shell, according to the invention, the tank is equipped with a shaped nozzle, in which are made interconnected stepwise axial channel and radial channels, below which a float valve is fixed for discharging a gas-air mixture, the stem of which is placed in an axial channel of a larger diameter with the possibility of overlapping radial channels of a shaped nozzle fixed coaxially to the central hole of the elastic shell, the float of which is made in the form of a torus enclosing the curly nozzle mounted on the inside of the elastic shell, which is fixed between two corner flanges installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane, with th upper angled flange is provided with eyelet, the lower point of which communicates with a further conduit for draining condensate.

Figure 1 presents a reservoir for storing volatile liquids, section;

figure 2 is the same (node A is the fastening of the elastic shell to the tank body);

in Fig 3 - the same (node B - shaped nozzle with a float valve for the release of gas mixture).

The 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 dispensing pipe 4 (one or two), and in the middle part there is a pipe 5 with a valve 6 for condensate drain. On the roof of the tank 3 there is a breathing valve 7, a safety valve 8 and a pipe 9 for installing a level control device. An elastic shell 10 made in the form of a glass is placed inside the tank. In the central part of the shell 10, a figured nozzle 11 with a float valve and a float 12 of the elastic shell 10, made in the form of a torus, inside which air is under pressure, are installed on the lower side.

A perforated casing 13 is installed above the receiving pipe 4 to prevent overlapping of the receiving pipe 4 with an elastic shell 10 before the end of the oil discharge.

In the middle part of the tank casing 1, an angular flange 14 and a removable angular flange 15 are installed on its inner side around the entire perimeter. Flanges 14 and 15 are installed with a slope of 1-2 ° to the horizontal plane. The end of the elastic shell 10 is hermetically fixed to the corner flange 14 using a gasket 16 and the corner flange 15. The corner flange 15 consists of separate components forming a tray along which condensate flows to the nozzle 5. The corner flange 15 has a flange 17, which prevents damage to the shell 10 with a tank filled with oil.

The shaped nozzle 11 has a flange 18 for attaching to the elastic shell 10 coaxially with its central hole 19 and a flange 20 for attaching the protective casing 21.

Inside the curly nozzle 11, a stepped axial channel 22 and radial channels 23 and 24 are made.

Below the radial channels 23 and 24, a float valve is installed, consisting of a stem 25 and seals 26, located in a stepped axial channel 22 of large diameter. The rod 25 is rigidly connected to the float 27.

The flange 18 of the shaped nozzle 11 is mounted on an elastic shell 10 having a central hole 19, using a flange 28 and a bolted connection.

The float 12 of the elastic shell 10 is fixed to the shell 10 in several places with glue. It holds the central part of the elastic shell 10 with the curly nozzle 11 afloat.

As a material for the manufacture of elastic shell 10 can be used gas-resistant rubber-fabric or synthetic materials.

To measure the level of oil product 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-production enterprise, which can be installed on pipe 9 located in the center of the roof of the 3 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 10, and, consequently, to reduce the amount of condensate released from this volume of air, the known breathing 7 and safety 8 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 10 is located on the bottom 2 of the tank. In the process of filling the tank, the elastic shell 10 pops up and together with the oil rises. The air inside the tank above the elastic sheath 10 is displaced through the breathing valve 7 into the atmosphere. A small amount of air that was before filling started between the bottom of the tank 2 and the elastic shell 10, especially at the interface between the body 1 and the bottom 2, during filling the tank is collected under the elastic shell 10 in its central part at the location of the float 12 and leaves - under the shell into the air space above the shell through the float valve of the curved nozzle 11. Condensate formed inside the tank above the elastic shell drains along the walls of the tank body 2 to the corner flange 15, forming tray, and through pipe 5 and valve 6 periodically merges into the container. The presence of oil in the condensate is determined visually. It indicates the tightness of the elastic shell.

The filling height of the tank with oil is monitored using well-known level gauges, for example using a radar level gauge of the RVR-102 or RVR-102A brand.

Above the elastic sheath 10, the air pressure is maintained, to which the breathing valve 7, the safety valve 8 are adjusted and, therefore, free ventilation of the air space above the elastic sheath 10 is eliminated and, as a result, the amount of condensate is reduced.

Thus, in the process of operating the tank, the contact of the oil product with the atmosphere is almost completely eliminated and, therefore, there is no loss of oil product from evaporation both during the filling of the tank and during storage.

The use of the invention will improve the efficiency of operation of the tank by creating conditions for the drainage of condensate formed above the shell and between the shell and the housing, while providing control of the tightness of the elastic shell.

Claims (1)

A reservoir for storing volatile liquids, comprising a receiving port located in the lower part of the housing, breathing and safety valves, and an elastic membrane fixed along the inner perimeter of the housing with a float and a central opening connected to the valve for discharging the gas-air mixture from under the elastic membrane, characterized in that the tank is equipped with a figured nozzle, in which a stepped axial channel and radial channels are connected to each other, below which a float is fixed a valve for discharging a gas-air mixture, the stem of which is placed in an axial channel of a larger diameter with the possibility of overlapping radial channels of a shaped nozzle fixed coaxially to the central hole of the elastic shell, the float of which is made in the form of a torus enclosing the curly nozzle mounted on the inside of the elastic shell, which is fixed between two corner flanges installed in the middle of the tank body with a slope of 1-2 ° to the horizontal plane, while the upper corner flange is made n flare, the lower point of which communicates with a further conduit for draining condensate.

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