JPH1159790A - Breather valve for domed-roof tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drain produced by condensation of vapor gas from being scattered. SOLUTION: This breather valve 10 has gutter portions 16 constituting a drain separator 11, which are provided at a peripheral edge of a lower end of a hood outlet of a hood 15 covering an outlet portion of the breather valve 10, and the gutter portions 16 are allowed to communicate with the inside of a tank through return pipes 17. With this arrangement, it is so designed that drain condensed on a wall face of the hood is collected to the gutter portions 16 and returned to the inside of the tank to prevent drain from being scattered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather valve for discharging a vapor gas from a dome roof tank to the outside, and prevents the vapor gas from being drained and scattered around.

[0002]

2. Description of the Related Art Fuel oil of a plant such as a power plant is stored in various types of tanks according to its properties. For example, in the case of heavy oil, the roof always moves above the liquid level in accordance with a change in the storage amount. A floating roof tank or a dome roof tank with a closed structure is used.

As shown in FIG. 4, for example, the dome roof tank is composed of a cylindrical tank body 1 and a dome-shaped roof 2 covering the upper part thereof. When storing high-viscosity heavy oil, it is not shown. Since it is necessary to ensure fluidity by a heating device, the material is constantly heated and stored at about 70 ° C., and vapor gas is generated by this heating.

When the amount of the burper gas increases, the inside of the tank becomes pressurized. Therefore, a breather valve 3 for releasing the pressurized gas to the outside is provided on the roof 2 and, as shown in FIG. 5, is applied by a pressure valve 3a and a vacuum valve 3b. The pressure on the pressure side and the pressure on the pressure reduction side are set respectively, and when the set pressure is exceeded, the valves 3a and 3b are automatically opened to discharge the vapor gas from the hood 4 attached to both sides of the breather valve 3 and opening downward, to the outside. To release it.

On the other hand, in a dome roof tank, it may be necessary to periodically measure the storage amount from a hatch provided on the roof. In this case, a state in which a large amount of vapor gas is present before the breather valve is automatically opened. If you open the hatch, vapor gas will blow out.

[0006]

However, not only the vapor gas but also the liquid which is condensed and drained on the hood wall of the breather valve is released from the breather valve, and the roof portion of the tank becomes dirty or adhered. There is a problem that the coating on the damaged portion is deteriorated due to deterioration.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the related art, and has as its object to provide a breather valve for a dome roof tank which can prevent vapor gas from being drained and scattered.

[0008]

According to a first aspect of the present invention, there is provided a breather valve for a dome roof tank, which is installed on a roof of a dome roof tank and removes internal vapor gas. A breather valve that is provided at a lower peripheral edge of a hood outlet of the breather valve and that collects drain condensed on a hood wall; and a drain provided by communicating the gutter with the inside of the dome roof tank. A drain separator serving as a return pipe for returning is provided.

According to the breather valve of the dome roof tank, a gutter portion constituting a drain separator is provided at the periphery of the lower end of the hood outlet of the hood covering the outlet portion of the breather valve, and is communicated with the inside of the tank by a return pipe. Drain condensing on the hood wall is collected in a gutter and returned to the tank to prevent scattering.

According to a second aspect of the present invention, there is provided a breather valve for a dome roof tank, wherein the breather valve is installed on a roof of the dome roof tank and discharges internal vapor gas to the outside. A drain separator is provided, which is a hollow cooling pipe provided across the breather valve near the mounting portion to the roof tank and for cooling the vapor gas outside the pipe.

According to the breather valve of the dome roof tank, a drain separator composed of a hollow cooling pipe is provided across the breather valve, and the vapor gas outside the pipe in the breather valve is supplied with air flowing through the pipe. It is cooled and condensed and returned into the tank to prevent scattering outside the tank.

Further, a breather valve for a dome roof tank according to a third aspect of the present invention is a breather valve installed on the roof of the dome roof tank for discharging internal vapor gas to the outside, wherein the breather valve is connected to a hood. A drain separator formed of a wire mesh provided inside the unit and made into a tank through a breather valve by draining vapor gas is provided.

According to the breather valve of the dome roof tank, a drain separator made of a wire mesh is provided inside the hood connection portion of the breather valve, and vapor gas is drained by a cooling effect and a filter effect at the wire mesh portion. In addition, the amount of release to the outside is suppressed, and returned to the inside of the tank to prevent scattering outside the tank.

According to a fourth aspect of the present invention, there is provided a breather valve for a dome roof tank according to the first aspect, wherein the breather valve provided with the drain separator comprising the gutter portion and the return pipe is connected to the dome roof tank. A drain separator, which is a hollow cooling pipe that is provided across the breather valve near the mounting portion and cools the vapor gas outside the pipe, is additionally provided.

According to the breather valve of the dome roof tank, a gutter portion constituting a drain separator is provided on the periphery of the lower end of the hood outlet of the hood covering the outlet portion of the breather valve, and is communicated with the inside of the tank by a return pipe. A drain separator consisting of a hollow cooling pipe is provided across the valve, and inside the breather valve, the vapor gas outside the pipe is cooled by air flowing through the pipe, condensed, returned to the tank, and further discharged. Drain condensed on the wall of the hood by the gas is collected in the gutter and returned to the inside of the tank to more reliably prevent scattering.

According to a fifth aspect of the present invention, there is provided a breather valve for a dome roof tank, wherein the drain separator comprises the gutter and the return pipe according to the first or fourth aspect, in addition to the configuration of the first or fourth aspect. And a drain separator formed of a wire mesh that is provided inside the hood connection portion of the breather valve and that returns the vapor gas into the tank via the breather valve.

According to the breather valve of the dome roof tank, a gutter portion constituting a drain separator is provided on the periphery of the lower end of the hood outlet of the hood covering the outlet portion of the breather valve, and is communicated with the inside of the tank by a return pipe. A drain separator made of a wire mesh is provided inside the hood connection part of the valve, or a gutter part constituting a drain separator is provided around the lower end of the hood outlet of the hood covering the outlet part of the breather valve, and a return pipe is provided between the inside of the tank and the return pipe. Communication, and further provided a drain separator consisting of a hollow cooling pipe across the breather valve,
In addition to this, a drain separator made of a wire mesh is provided inside the hood connection part of the breather valve, and the vaporizing gas is drained by the cooling effect and the filtering effect at the wire mesh part, and the amount of discharge to the outside is suppressed, Drain condensed on the hood wall of the vapor gas that escapes from the hood is collected in the gutter and returned to the tank to prevent scattering more reliably, or vapor gas outside the pipe is discharged inside the pipe using the breather valve. Cooled by the flowing air, condensed and returned to the tank, and further released vapor gas was drained by the cooling effect and filter effect at the wire mesh part, suppressing the amount of gas released to the outside, Drain condensing on the wall of the hood is collected in a gutter and returned to the inside of the tank to more reliably prevent scattering.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial longitudinal sectional view and a partially enlarged perspective view of an embodiment of a breather valve for a dome roof tank according to the present invention.

In the breather valve 10 of the dome roof tank, as shown in FIG. 1, a cylindrical vent nozzle 5 is mounted upright on the roof 2 of the dome roof tank, and is mounted above the roof via flanges 5a, 6a. Then, a frame arrester 6 is provided, and a drain separator 11 is installed via a flange 6 b above the frame arrester 6.

The drain separator 11 of the breather valve 10 has a short pipe 12 connected to the upper flange 6b of the frame arrester 6, and is connected to the frame arrester 6 via the lower flange 12a. .

A substantially cylindrical breather valve body 13 whose upper part is closed is connected to an upper flange 12b of the short pipe 12 by a lower flange 13a.
A substantially rectangular opening 14 is formed on both sides of the opening 3, and a hood 15, which is open downward, is attached to the opening flange 14 a of the opening 14 so as to cover the opening 14 with a flange 15 a.

As shown in FIG. 1 (b), a gutter portion 16 is provided at a peripheral edge of a lower end of the outlet opening downwardly of the hood 15, and for example, an angle member is attached thereto. Condensed drain can be stored.

In order to return the drain accumulated in the gutter section 16 to the dome roof tank, one end of the return pipe 17 is connected to the bottom of the gutter section 16 and the other end is connected to the side of the short pipe 12. Yes, the drain is returned to the tank from above the flame arrester 6.

In the breather valve 10 of the dome roof tank configured as described above, high-viscosity heavy oil is stored.
By heating to about ℃, high-temperature vapor gas is generated,
This is cooled by contact with the wall surface of the hood 15 and is drained. Since the drain separator 11 is provided with a gutter portion 16 at the periphery of the lower end of the outlet of the hood 15, the drain is separated from the gutter portion 16.
And the collected drain is returned to the tank via the return pipe 17.

As a result, only the vapor gas is released from the breather valve 10, and the drain is not scattered, so that the roof 2 can be prevented from being stained and the paint from being deteriorated.

In this embodiment, the opening flange 14a of the opening 14 of the breather valve body 13 and the hood 1
A drain separator 19 composed of a wire net 18 is mounted between the flange 15a and the fifth flange 15a. For example, a stack of four stainless steel wools is used. The drain separator 19 is drained by a vapor gas cooling effect and a filter effect and returned to the tank.
The amount of release to the outside is reduced.
The vapor gas flowing over the hood is cooled by the wall of the hood to be drained, and the collected gas is collected in the gutter portion 16 and returned to the inside of the tank so as to more reliably prevent the scattering of the drain.

Next, another embodiment of the present invention will be described with reference to FIG. 2. The same symbols are given to the same portions as the already described embodiment, and the description is omitted.

In the breather valve 20 of the dome roof tank, the cooling of the vapor gas generated from the dome roof tank is promoted to be drained and removed before being discharged from the hood 15. A cooling pipe 22 constituting a drain separator 21 is provided between the lower flange 13 a of the thirteen and the upper flange 6 b of the frame arrester 6.

The cooling pipe 22 is connected to the breather valve main body 1.
3 through the cylindrical cooling duct 23 connected between the lower flange 13a and the upper flange 6b of the frame arrestor 6 via the flanges 23a and 23b, and crosses and crosses the breather valve 20,
Outside air flows inside the cooling pipe 22, and vapor gas flows outside the cooling pipe 22.

In the breather valve 20 of the dome roof tank configured as described above, the high-viscosity heavy oil vapor gas heated to about 70 ° C. is stored in the cooling pipe 22 that forms the drain separator 21 of the breather valve 20. When the air passes, the air is cooled by the outside air flowing through the cooling pipe 22 to promote drainage, and is cooled to substantially the same temperature as the outside air to remove the drain and return to the tank, so that only the vapor gas is released from the hood 15. Is done.

As a result, it is possible to prevent the drain from scattering from the breather valve 20 and to prevent the roof 2 from being stained or the coating from being deteriorated.

In this embodiment, a drain separator 19 composed of a wire net 18 is mounted between the opening flange 14a of the opening 14 of the breather valve body 13 and the flange 15a of the hood 15, as in the above embodiment. For example, a stack of four stainless steel wools is used, which is drained by the cooling effect of the vapor gas and the filter effect and returned to the tank, or the amount of discharge to the outside is suppressed. The discharged vapor gas is further drained to more reliably prevent the scattering of the drain.

Next, still another embodiment of the present invention will be described with reference to FIG. 3. The same symbols are used for the same parts as those of the two embodiments already described, and the description is omitted.

In the breather valve 30 of the dome roof tank, the drain separator 11 including the gutter section 16 and the return pipe 17 described in the first embodiment, and the cooling pipe 22 described in the second embodiment. The short pipe 12 is connected to the upper flange 6b of the frame arrestor 6, and the cooling duct 2 is connected to the upper flange 12b of the short pipe 12.
3 are connected.

A gutter portion 16 made of, for example, an angle material is provided at a peripheral edge of a lower end of the outlet opening downwardly of the hood 15, and the drain condensed on the wall surface of the hood 15 can be collected. In order to return the drain accumulated in the gutter 16 to the dome roof tank, one end of the pipe 17 is connected to the bottom of the gutter 16 and the other end is connected to the short pipe 12.
The drain is returned to the tank from the upper part of the flame arrester 6.

Further, the cooling duct 23 above the short pipe 12
A cooling pipe 22 is mounted inside the cooling duct 23 so as to penetrate the cooling duct 23 and cross the breather valve 30 vertically and horizontally so that outside air flows through the cooling pipe 22 and vapor gas flows outside the cooling pipe 22. It has become.

In the breather valve 30 of the dome roof tank configured as described above, the vapor gas of the high-viscosity heavy oil, which is heated to about 70 ° C. and stored, cools the cooling pipe 22 constituting the drain separator 21 of the breather valve 30. When passing through the cooling pipe 22, it is cooled by the outside air flowing through the inside of the cooling pipe 22 to promote drainage, cooled to almost the same temperature as the outside air, drain is removed and returned to the tank, and further, the vapor gas passing through the cooling pipe 22 is further cooled. Hood 15
Is cooled by contact with the wall surface of the hood 15 to form a drain separator 11.
Is provided, the drain collects in the gutter portion 16, the collected drain is returned from the short pipe 12 to the tank via the return pipe 17, and only the vapor gas is released from the hood 15.

Thus, the drain does not scatter from the breather valve 30, and it is possible to prevent the roof 2 from being stained and the coating from being deteriorated.

In this embodiment, similarly to the above two embodiments, the opening 14 of the breather valve body 13 is provided.
A drain separator 19 composed of a wire mesh 18 is attached between the opening flange 14a of the hood 15 and the flange 15a of the hood 15. For example, a stack of four stainless steel wools is used, and drainage is performed by a vapor gas cooling effect and a filter effect. And the amount of gas discharged to the outside is suppressed, and the vapor gas flowing out of the cooling pipe 22 is further drained to prevent the drain from scattering more reliably.

In each of the above embodiments, a case has been described in which the drain separators 11 and 21 are combined with the drain separator 19 constituted by the wire mesh 18. However, only the drain separator 19 is provided alone and the drainage of the vapor gas is performed. It is also possible to return to the tank in order to prevent the drain from scattering.

[0041]

According to the breather valve of the dome roof tank according to the first aspect of the present invention, as described above in detail with the embodiments, the lower end of the hood covering the outlet portion of the breather valve has a lower periphery. In addition to providing a gutter part that constitutes the drain separator and communicating with the inside of the tank with a return pipe, drain condensing on the hood wall can be collected in the gutter part and returned to the tank, and only the vapor gas from the breather valve It is released, and the drain is not scattered, so that it is possible to prevent the roof from being stained and the coating from being deteriorated.

According to the breather valve of the dome roof tank according to the second aspect of the present invention, since the drain separator composed of a hollow cooling pipe is provided across the breather valve, the vapor outside the pipe in the breather valve is provided. The gas can be cooled and condensed by the air flowing in the pipe and condensed and returned to the inside of the tank, and the scattering of the drain outside the tank can be prevented, and the roof can be prevented from being stained and the coating can be prevented from being deteriorated.

Further, according to the breather valve of the dome roof tank according to the third aspect of the present invention, since the drain separator made of wire mesh is provided inside the hood connection portion of the breather valve, the cooling effect and the filter effect at the wire mesh portion are provided. To drain the vapor gas back into the tank,
The amount of discharge to the outside can be suppressed, and the scattering of the drain to the outside of the tank can be prevented.

According to a breather valve for a dome roof tank according to a fourth aspect of the present invention, a gutter portion constituting a drain separator is provided on the periphery of a lower end of a hood outlet of a hood covering an outlet portion of the breather valve, and a return pipe is provided. Since a drain separator consisting of a hollow cooling pipe was provided across the breather valve,
In the breather valve, the vapor gas outside the pipe can be cooled and condensed by the air flowing through the pipe and returned to the tank.Drain condensed on the hood wall by the released vapor gas is collected in the gutter and collected in the tank. It can be returned, and scattering can be prevented more reliably.

Further, according to the breather valve for a dome roof tank according to the fifth aspect of the present invention, a gutter portion constituting a drain separator is provided on a periphery of a lower end of a hood outlet of a hood covering an outlet portion of the breather valve, and a return pipe is provided. In addition, a drain separator made of a wire mesh is provided inside the hood connection part of the breather valve, or a gutter part constituting a drain separator is provided on a periphery of a lower end of a hood outlet of a hood covering an outlet part of the breather valve. In addition, a drain pipe made of a hollow cooling pipe was provided across the breather valve, and a drain separator made of a wire mesh was provided inside the hood connection portion of the breather valve in addition to the drain pipe. Because of the cooling effect and the filtering effect at the wire mesh, Can be drained back into the tank, and the amount of gas released outside the wire mesh can be reduced. In the breather valve, the vapor gas outside the pipe is cooled by the air flowing through the pipe, condensed and returned to the tank, and the released vapor gas is drained by the cooling effect and the filter effect at the wire mesh. Drain condensed on the hood wall of the vapor gas that passes over the wire mesh can be collected in the gutter and returned to the tank, reducing the amount of release to the outside or the outside, and preventing scattering more reliably. Can be.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view and a partially enlarged perspective view of an embodiment of a breather valve of a dome roof tank according to the present invention.

FIG. 2 is a partial longitudinal sectional view of another embodiment of the breather valve of the dome roof tank according to the present invention, and a view taken in the direction of arrows BB.

FIG. 3 is a partial longitudinal sectional view of still another embodiment of the breather valve of the dome roof tank according to the present invention.

FIG. 4 is an explanatory diagram of a dome roof tank to which the present invention is applied.

FIG. 5 is a longitudinal sectional view of a conventional breather valve.

DESCRIPTION OF SYMBOLS 1 Tank body 2 Roof 5 Vent nozzle 6 Flame arrestor 10 Dome Breather valve of roof tank 11 Drain separator 12 Short pipe 13 Breather valve body 14 Opening 15 Hood 16 Gutter section 17 Return pipe 18 Wire mesh 19 Drain separator 20 Dome Breather valve for roof tank 21 Drain separator 22 Cooling pipe 30 Breather valve for dome roof tank

Claims (5)

[Claims] 1. A breather valve installed on the roof of a dome roof tank for discharging internal vapor gas to the outside, a gutter portion provided at a lower peripheral edge of a hood outlet of the breather valve for storing drain condensed on a hood wall surface. A breather valve for a dome roof tank, wherein a drain separator is provided which is provided to communicate the gutter portion with the inside of the dome roof tank and is a return pipe for returning drain. 2. A breather valve which is installed on a roof of a dome roof tank and discharges internal vapor gas to the outside. The breather valve is provided across a breather valve near a mounting portion of the breather valve to the dome roof tank. A breather valve for a dome roof tank, comprising a drain separator comprising a hollow cooling pipe for cooling vapor gas outside the pipe. 3. A breather valve installed on the roof of a dome roof tank to discharge internal vapor gas to the outside. The breather valve is provided inside a hood connection portion of the breather valve, and the vapor gas is drained to be discharged through the breather valve. A breather valve for a dome roof tank, provided with a drain separator made of a wire mesh that is returned into the tank. 4. A vapor gas pipe provided across the breather valve near a mounting portion of the breather valve provided with the drain separator according to claim 1 comprising the drain section and the return pipe to the dome roof tank. 2. A breather valve for a dome roof tank according to claim 1, further comprising a drain separator comprising a hollow cooling pipe for cooling outside. 5. The breather valve provided with the drain separator according to claim 1, comprising the gutter portion and the return pipe, wherein the vapor gas is drained and returned to the tank via the breather valve. The breather valve for a dome roof tank according to claim 1 or 4, further comprising a drain separator made of a wire mesh.