JP2017137071A - Automatic air vent for floating roof tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic air bleeding structure of a floating roof type tank having excellent safety and ventilation capable of suppressing damage to a valve cylinder and generation of through holes. SOLUTION: The structure of an automatic air vent 2a provided on a floating roof plate 1 of a floating roof type tank, the automatic air vent 2a is an automatic air vent mounting nozzle 3 installed on an upper part of the floating roof plate 1 and the automatic air vent mounting. It has an outer structure having a valve cylinder 4 connected in an upright position on the upper part of the nozzle 3 and a valve opening 4a on the upper part of the valve cylinder 4, and with the upper end portion of the valve cylinder 4 as the floating roof plate 1 moves up and down. A lid-shaped valve body 5 that closes or separates to open and close the valve port 4a, a sleeve tube 6 that is inserted through a through hole 5a provided in the center of the valve body 5 and arranged vertically, and the sleeve tube. The sleeve tube 6 is composed of a support column 7 that penetrates through the inside of the 6 and is characterized in that the sleeve tube 6 is provided with fins 8 having a two-stage upper and lower structure in which a plurality of flat plates are radially fixed on the outer peripheral surface. [Selection diagram] Fig. 1

Description

  The present invention relates to an automatic air vent structure provided on a floating roof of a floating roof type tank.

The floating roof plate 1 of the floating roof type tank has a plurality of ventilation devices, usually called automatic air vents 17.
In order to smoothly introduce liquid into the floating roof tank, the automatic air vent 17 automatically discharges the air staying under the floating roof plate 1 and the air flowing into the tank from the attached piping to the outside of the tank. This is a ventilation device.
Usually, the floating roof tank stores liquid such as highly volatile crude oil, and the vapor V generated by the volatilization of the content liquid accumulates in the gap between the bottom surface of the floating roof plate 1 and the liquid level of the content liquid. Since the floating roof board 1 may be damaged by the pressure, the steam V is automatically discharged from the tank by the automatic air vent 17.
A conventional structure of the automatic air vent 17 is shown in FIG.
The automatic air vent 17 is a device provided on the floating roof plate 1 and is connected to the cylindrical automatic air vent mounting nozzle 3 installed above the floating roof plate 1 in an upright manner on the upper portion of the automatic air vent mounting nozzle 3. A valve cylinder 4 having an outer structure having a valve port 4a on the upper part of the valve cylinder 4. The valve port 4a is brought into close contact with or detached from the upper end of the valve cylinder 4 as the floating roof plate 1 is moved up and down. A lid-like valve body 5 having a downwardly concave shape that opens and closes, a sleeve pipe 6 that is vertically disposed through a through hole 5a provided in the center of the valve body 5, and the inside of the sleeve pipe 6 It is a valve structure comprised from the support | pillar 7 penetrated and penetrated, Comprising: The said sleeve pipe | tube 6 and the support | pillar 7 have the structure which penetrated and connected the volt | bolt 18 to the bolt holes 6a and 7a provided in each.
In the state where the lower end of the support column 7 reaches the tank bottom plate and the floating roof plate 1 is lowered, the automatic air vent 17 opens the valve port 4a and the valve body 5 so as to smoothly receive the content liquid. Alternatively, for the purpose of preventing the floating roof board 1 from being damaged, the air and steam V staying under the floating roof board 1 are automatically discharged. In the state where the floating roof board 1 is floating, the valve port 4a is brought into close contact with the valve body 5 by its own weight of the support column 7 and the like, and is shut off from the outside air.
In addition, the automatic air bleeder 17 is usually provided with a plurality of fins 13 and a slide plate 14 on the outer peripheral surface of the sleeve tube 6 so that the sleeve tube 6 and the support column 7 can integrally move up and down stably in the valve cylinder 4. And a ring-shaped gasket 19 is fitted to the upper end of the valve cylinder 4 so as to be surely shut off from the outside air when the valve is closed.
FIG. 8 is an explanatory plan view showing the detailed structure of the C – C portion of FIG. 7, and the fins 13 are usually formed of flat plates and are radially fixed to the outer peripheral surface of the sleeve tube 6. FIG. Further, as shown in FIG. 8, the normal fin 13 and the flat slide plate 14 are joined together with bolts and nuts 15 at an arbitrary overlapping margin.

In Patent Document 1 (US-A-2536077) “VENT FOR FLOATING ROOF TANKS”, when the floating roof is located at the bottom inside the tubular member provided on the floating roof of the floating roof tank. A structure of a vent hole is disclosed in which an upright pipe having a structure in which a sealing member opens is provided, and a plurality of fins tapered on the outer peripheral surface of the pipe are radially fixed.

Patent Document 2 (Japanese Patent No. 3354159) “Floating Roof Vacuum Safety Valve for Liquid Storage Tank” has a floating roof at the bottom of the outer cover provided on the floating roof of the floating roof type tank. There is disclosed a structure of a vacuum safety valve having an upright body having a structure in which an upper stopper is separated and opened when positioned, and a plurality of fins are radially fixed to the body.

Patent Document 3 (Japanese Utility Model Laid-Open No. 52-16020) “Automatic venting on / off valve provided on the floating roof of a floating roof storage tank” includes a lower end of a valve rod as the stored liquid is discharged or filled in the floating roof storage tank. The structure of an automatic on-off valve for ventilation provided on the upper surface of the floating roof of a floating roof type storage tank in which the float of the valve lowers or rises and the valve seat of the valve cylinder and the valve at the upper part of the valve rod separate or close is opened and closed is disclosed. .

Patent Document 4 (Japanese Patent Application Laid-Open No. 55-20108) "Floating roof type tank for storing evaporable liquid" has a valve body attached to the upper end of a support rod and closed airtightly relative to the upper end of a nozzle. The structure of a vent valve for a floating roof tank is disclosed.

US-A-2536077 Japanese Patent No. 3354159 Japanese Utility Model Publication No. 52-16020 Japanese Patent Laid-Open No. 55-20108

The automatic air vent 17 is a ventilation device for automatically discharging air and steam V staying under the floating roof board 1 for the purpose of smoothly receiving the liquid contents or preventing the floating roof board 1 from being damaged. However, the valve cylinder 4 may be damaged due to repeated contact with the fins 13 when the tank is in service.
That is, in view of the mounting condition of the automatic air vent 17, as shown in FIG. 9, the automatic air vent 17 is easy to vibrate the valve body 5, the support column 7 and the like in the radial direction of the valve cylinder 4. When S is large, the side surface portion of the outer edge of the slide plate 14 joined to the fin 13 and a specific portion on the inner surface side of the valve cylinder 4 are in contact with each other repeatedly. In addition, since the inner surface side of the valve cylinder 4 is in a corrosive environment filled with the vapor V of the content liquid, when a specific part on the inner surface side of the valve cylinder 4 is repeatedly contacted with the fins 13 and wears, There was a possibility that the corrosion accelerated and the through hole P was formed. When the valve cylinder 4 is damaged or the through hole P is generated, the existing valve cylinder 4 needs to be repaired or replaced.
As described above, the cause of the contact between the slide plate 14 of the automatic air vent 17 and the inner surface of the valve cylinder 4 is that the support column 7 vibrates S in the radial direction of the valve cylinder 4, and the reason is as follows. Can be mentioned.
For one thing, normally floating roof tanks store highly viscous liquids such as crude oil, and are equipped with stirrers such as tank mixers on the side plates for the purpose of preventing sedimentation of the liquid contents and equalizing the temperature. In many cases, the automatic air vent 17 installed in a suspended shape from the floating roof board 1 has a structure in which vibration S is likely to occur due to a stirring flow M such as a tank mixer.
In addition, the floating roof tank is often installed in a windy coastal area, and the floating roof plate 1 is swung by a strong wind, and accompanying this, an automatic air vent 17 etc. fixed to the floating roof plate 1 is attached. It can also be mentioned that the structure also swings. Furthermore, the floating roof board 1 is also largely swung by the sloshing phenomenon of the content liquid due to the earthquake. For these reasons, the automatic air vent 17 installed in a suspended manner from the floating roof board 1 is an apparatus that easily vibrates.
In addition to the problems associated with the swinging of the floating roof plate 1, the floating roof plate 1 of the conventional floating roof type tank has a flexible structure in which thin plates are integrated by welding. In some cases, the outer structure of the automatic air vent 17 constituted by the automatic air vent mounting nozzle 3 and the valve cylinder 4 is inclined from the vertical direction. When the outer structure of the automatic air vent 17 is inclined, the valve 4a is not sufficiently opened and closed by the valve body 5 when the floating roofing board 1 is moved up and down, and the air and steam V are released from the tank by the automatic air vent 17 to the outside. There was a risk that the discharge and sealing inside and outside the tank would be insufficient.
For this reason, the structure of the conventional automatic air vent 17 is highly likely to cause damage to the valve cylinder 4 or the through hole P, and insufficient sealing when the valve is closed. It was.

  Patent Document 1 “VENT FOR FLOATING ROOT TANKS” relates to a structure of a vent hole in which a plurality of fins tapered on an outer peripheral surface of an upright pipe installed inside a tubular member are radially fixed. It does not relate to a structure in which a slide plate is joined, and it does not relate to a structure in consideration of preventing damage to the nozzle of the vent valve.

  Patent Document 2 “Vacuum Safety Valve for Liquid Floating Roof” guides the outer peripheral surface of an upright main body installed inside the outer casing so that the main body can slide vertically in the outer casing. The present invention relates to a structure in which a plurality of fins are provided in a radial manner, but does not relate to a structure in which a slide plate is joined to the fins, and does not relate to a structure in consideration of preventing damage to the nozzle of the vent valve.

Patent document 3 “automatic on-off valve for ventilation provided on the floating roof of a floating roof storage tank” relates to a structure that automatically raises and lowers the float provided at the lower part of the valve rod with the raising and lowering of the floating roof, This is not related to a valve structure in which the valve body provided at the upper portion of the support column is detached from the upper end portion of the valve cylinder and automatically opens when the floating roof plate 1 is lowered.

  Patent Document 4 “Floating Roof Type Tank that Stores Evaporating Liquid” relates to the structure of a columnar vent valve that automatically opens and closes as the floating roof is raised and lowered. It is a structure aimed at suppressing the generation of evaporative gas by suppressing the heat transfer to the liquid level by keeping the space at the bottom of the floating roof by hanging the lower part of the bottom below the floating roof plate, It does not relate to a structure that prevents damage to the nozzle of the vent valve.

The object of the present invention has been made in view of the above-mentioned problems of the prior art, and is a floating roof excellent in safety and air permeability that can suppress the damage of the valve cylinder and the generation of the through hole. A structure for automatically venting a tank is provided.

The automatic air vent of the floating roof type tank according to the invention of claim 1 is an automatic air vent structure provided on the floating roof plate of the floating roof type tank, and the automatic air vent is mounted on the automatic air vent installed at the upper part of the floating roof plate. An outer structure having a nozzle and an upwardly connected valve cylinder on the upper part of the automatic air vent mounting nozzle, and having a valve opening on the upper part of the valve cylinder, and the upper end of the valve cylinder as the floating roof plate is raised and lowered A lid-like valve element that opens or closes the valve port by closely contacting or detaching from the sleeve, a sleeve pipe that is vertically disposed through a through-hole provided in the center of the valve element, and penetrates through the sleeve pipe The sleeve tube has a structure having upper and lower two-stage fins in which a plurality of flat plates are fixed radially on the outer peripheral surface.

The automatic air vent of the floating roof type tank according to the invention of claim 2 is an automatic air vent structure provided on the floating roof plate of the floating roof type tank, and the automatic air vent is mounted on the automatic air vent installed on the upper part of the floating roof plate. An outer structure having a nozzle and an upwardly connected valve cylinder on the upper part of the automatic air vent mounting nozzle, and having a valve opening on the upper part of the valve cylinder, and the upper end of the valve cylinder as the floating roof plate is raised and lowered A lid-like valve element that opens or closes the valve port by closely contacting or detaching from the sleeve, a sleeve pipe that is vertically disposed through a through-hole provided in the center of the valve element, and penetrates through the sleeve pipe The valve body has a structure including a steady plate having a structure in which a plurality of flat plates are radially fixed to an inner side surface portion.

The automatic air venting of the floating roof type tank according to the invention of claim 3 is a flat plate in which the fin or the steady rest plate of claim 1 or claim 2 is bent at the tip part which becomes the valve wall surface side, Alternatively, it is a structure that is joined to a flat plate-like slide plate that is bent at the tip side that is the valve wall surface side at an arbitrary overlap allowance, and the fin or the steady plate is a structure that makes surface contact with the valve cylinder. And

The automatic air vent of the floating roof type tank according to the invention of claim 1 is an automatic air vent structure provided on the floating roof plate of the floating roof type tank, and the automatic air vent is mounted on the automatic air vent installed at the upper part of the floating roof plate. An outer structure having a nozzle and an upwardly connected valve cylinder on the upper part of the automatic air vent mounting nozzle, and having a valve opening on the upper part of the valve cylinder, and the upper end of the valve cylinder as the floating roof plate is raised and lowered A lid-like valve element that opens or closes the valve port by closely contacting or detaching from the sleeve, a sleeve pipe that is vertically disposed through a through-hole provided in the center of the valve element, and penetrates through the sleeve pipe Since the sleeve tube has a structure having two upper and lower fins in which a plurality of flat plates are fixed radially on the outer peripheral surface,
Since the structure in which the struts installed in the valve cylinder are restrained in the radial direction by the upper and lower two-stage fins, the vibration of the struts and the inclination angle of the valve body are reduced. It is possible to reduce the load on the valve cylinder side and suppress the damage on the valve cylinder side and the generation of through holes.
In addition, since the vertical movement of the column within the valve cylinder is reliably guided by the two-stage fins, the valve body does not tilt when the floating roof is raised and lowered, and the valve opening is sealed by the valve body. Can be performed reliably.

The automatic air vent of the floating roof type tank according to the invention of claim 2 is an automatic air vent structure provided on the floating roof plate of the floating roof type tank, and the automatic air vent is mounted on the automatic air vent installed on the upper part of the floating roof plate. An outer structure having a nozzle and an upwardly connected valve cylinder on the upper part of the automatic air vent mounting nozzle, and having a valve opening on the upper part of the valve cylinder, and the upper end of the valve cylinder as the floating roof plate is raised and lowered A lid-like valve element that opens or closes the valve port by closely contacting or detaching from the sleeve, a sleeve pipe that is vertically disposed through a through-hole provided in the center of the valve element, and penetrates through the sleeve pipe Since the valve body is a structure provided with a steady-state plate having a structure in which a plurality of flat plates are radially fixed to the inner side surface portion,
Since the struts installed in the valve cylinder are restrained in the radial direction by the steady plate so that the vibration of the pillars and the tilt angle of the valve body are reduced, the sleeve tube or the pillar contacts the inner surface of the valve cylinder. This can be suppressed, and the occurrence of damage and through holes on the valve cylinder side can be suppressed.
The anti-rest plate has a structure located between the upper outer peripheral surface of the valve cylinder and the inner side surface of the valve body, and the long and heavy support column is not pulled out from the automatic air vent mounting nozzle and the valve cylinder. Inspection and replacement are possible. Therefore, it is not necessary to provide a temporary mount for pulling out a long and heavy column, and it is possible to reduce labor and labor for inspection and replacement. Further, the state of the steady rest plate can be easily confirmed on the floating roof, and maintenance management is easy.

The automatic air venting of the floating roof type tank according to the invention of claim 3 is a flat plate in which the fin or the steady rest plate of claim 1 or claim 2 is bent at the tip part which becomes the valve wall surface side, Alternatively, it is a structure that is joined with a flat slide plate that is bent at the tip portion that becomes the valve wall surface side at an arbitrary overlap, and the fin or the steady plate is a structure that makes surface contact with the valve cylinder,
The automatic air vent vibrates and the fin, slide plate, or steady rest plate comes into contact with the valve cylinder over a wide area, so the load on the valve cylinder is dispersed and damage to the cylinder and the generation of through holes are suppressed. Is possible.

It is sectional explanatory drawing which shows the structure of the automatic air vent 2a of a 1st case. FIG. 2 is an explanatory plan view showing an example of a detailed structure of a section AA in FIG. It is sectional explanatory drawing which shows the structure of the automatic air vent 2b of a 2nd example. It is the plane and cross-sectional explanatory drawing which show the 1st example of the detailed structure of the B section of FIG. It is the plane and cross-sectional explanatory drawing which show the 2nd example of the detailed structure of the B section of FIG. It is the plane and cross-sectional explanatory drawing which show the 3rd example of the detailed structure of the B section of FIG. It is sectional explanatory drawing which shows the example of the structure of the conventional automatic air vent 17. FIG. FIG. 8 is an explanatory plan view showing an example of a detailed structure of a C – C section in FIG. It is sectional explanatory drawing which shows the state which the conventional automatic air vent 17 vibrates S and inclines.

1 to 6 show an embodiment of automatic air venting of a floating roof type tank according to the present invention. The present invention is not limited to the embodiments shown below and in the drawings. It goes without saying that the following constituent elements can be omitted or added, and the shape of the constituent elements can be changed without departing from the gist of the present invention. In addition, the figure shows the outline, only a part is drawn and the detailed structure is omitted.

As the structure of the automatic air vent of the floating roof type tank according to the present invention, FIGS. 1 and 2 show the structure of the automatic air vent 2a of the first case, and FIGS. 3 to 6 show the structure of the automatic air vent 2b of the second case. A configuration common to the automatic air vents 2a and 2b is as follows.
The automatic air vent 2 is a device provided in a state where a plurality of the automatic air vents 2 are erected on the floating roof board 1.
The automatic air vent 2 is configured by an automatic air vent mounting nozzle 3 installed at the upper part of the floating roof plate 1 and a valve cylinder 4 connected upright to the upper part of the automatic air vent mounting nozzle 3. The valve cylinder 4 has a valve opening 4a for discharging air and steam V when the valve is opened.
The automatic air vent 2 includes a lid-like valve body 5 having a downwardly concave shape that opens and closes the valve port 4a by being in close contact with or disengaging from the upper end portion of the valve cylinder 4 as the floating roof plate 1 is moved up and down, and the valve body 5 is constituted by a sleeve tube 6 which is inserted vertically through a through hole 5a provided in the central portion of 5 and a support column 7 which penetrates the sleeve tube 6 and is inserted. Further, the valve body 5 and the sleeve tube 6 have a structure in which the outer periphery of the through hole 5a is fixed and connected by welding or the like. Further, the sleeve tube 6 and the support column 7 have a structure in which bolts and nuts 18 are inserted and connected to bolt holes 6a and 7a provided respectively. A ring-shaped gasket 19 is fitted to the upper end portion of the valve cylinder 4 so as to be surely shut off from the outside air when the valve is closed. The gasket 19 may be installed on the inner surface side of the valve body 5. Further, when the valve is closed, the valve cylinder 4 and the valve body 5 can be reliably brought into close contact with each other so that the gasket 19 is not provided as long as it can be shut off from the outside air.
In the state where the lower end of the column 7 reaches the tank bottom plate and the floating roof plate 1 is lowered, the automatic air vent 2 opens the valve port 4a and the valve body 5 so as to smoothly receive the content liquid. Alternatively, for the purpose of preventing the floating roof board 1 from being damaged, the air and steam V staying under the floating roof board 1 are automatically discharged. In the state where the floating roof board 1 is floating, the valve port 4a is brought into close contact with the valve body 5 by its own weight of the support column 7 and the like, and is shut off from the outside air.
1 and 3 show a state in which the automatic air vent 2 is open.

FIG. 1 is a cross-sectional explanatory view showing the structure of a first example automatic air vent 2a provided on a floating roof plate 1 of a floating roof tank.
The automatic air vent 2a of the first case has a structure including a top and bottom two-stage fin 8 in which a plurality of flat plates are radially fixed to the outer peripheral surface of the sleeve tube 6 by welding or the like. The two-stage fin 8 is:
An upper fin 8a installed on the upper outer peripheral surface of the sleeve tube 6 and a lower fin 8b installed on the lower part with a gap from the upper fin 8a. Further, the mounting positions of the upper fin 8a and the lower fin 8b are within the height range from the upper end portion to the lower end portion of the valve cylinder 4, and the upper end portion of the upper fin 8a and the lower end portion of the lower fin 8b do not protrude from the valve cylinder 4. Like that. Further, the interval between the upper fin 8a and the lower fin 8b is made as large as possible in order to reduce the inclination angle of the valve body 5 and the column 7 and the like.
The fins 8a and 8b provided on the upper and lower outer peripheral surfaces of the sleeve tube 6 are structured to be joined to the flat slide plates 9a and 9b with bolts and nuts 15 or the like at an arbitrary overlapping margin.

The automatic air vent 2a of the first example includes the fins 8a and 8b having the upper and lower two-stage structures, and the vibration S of the support column 7 and the like installed in the valve cylinder 4 is increased by increasing the separation distance between the fins 8a and 8b. It is obvious that the load when the fin 8 comes into contact with the valve cylinder 4 is small because the structure is such that the inclination angle of the valve body 5 is small, and the damage to the valve cylinder 4 and the generation of the through hole P are suppressed. It becomes possible to do.
In addition, the automatic air vent 2a of the first case has a structure in which the vertical movement of the support column 7 in the valve cylinder 4 is reliably guided by the fins 8 having the two-stage upper and lower structures. The valve body 5 is not tilted, and the valve body 5 can be reliably closed with the upper end portion of the valve cylinder 4 closed.

FIG. 2 is an explanatory plan view showing an example of the detailed structure of the AA portion of FIG.
The fin 8 provided on the outer peripheral surface of the sleeve tube 6 is a bolt-nut 15 with a flat slide plate 9 in which a tip portion on the inner wall side of the valve cylinder 4 is bent in an L shape, a U shape or the like and an arbitrary overlap allowance. When the support column 7 and the like vibrate S, the side surface portion of the outer edge of the fin 8 is in surface contact with the inner surface side of the valve cylinder 4 in a wide area. Further, without providing the slide plate 9, the tip portion of the fin 8 on the inner wall side of the valve cylinder 4 may be bent into an L shape, a U shape, or the like.
In general, floating roof tanks often store flammable liquids such as crude oil. In such a case, a structure in which no spark is generated when the fins 8 and the valve cylinder 4 come into contact with each other is used. When the valve cylinder 4 is made of a steel plate, the fin 8 is made of a metal such as copper, aluminum or brass, or a hard non-spark material such as a synthetic resin such as hard rubber or hard plastic. However, when it is set as the structure which provides the slide plate 9, the fin 8 may be comprised with a steel plate, but in that case, the slide plate 9 is comprised with a hard non-spark material.

When the fin 8 or the slide plate 9 has the above-described structure, when the column 7 of the automatic air vent 2 vibrates S and the fin 8 or the slide plate 9 and the inner surface of the valve cylinder 4 contact each other, the inner surface of the valve cylinder 4 and the fin 8 or the outer edge side surface portion of the slide plate 9 is in surface contact with a wide area, the load applied to the valve cylinder 4 side is dispersed, and the damage on the valve cylinder 4 side and the generation of the through hole P are suppressed.
In FIG. 2, the number of the fins 8 and the slide plates 9 is 4 in each stage and 8 in total in 2 stages, but the quantity that restricts the movement of the support column 7 installed in the valve cylinder 4. If so, the number of fins 8 and slide plates 9 may be increased or decreased. Furthermore, it is good also as a structure which chamfered the edge part of the outer edge of the said fin 8 or the slide plate 9. FIG.
Further, the fin 8 or the slide plate 9 secures a necessary clearance L1 between the side surface portion of the outer edge thereof and the inner surface side of the valve cylinder 4, and from the automatic air vent mounting nozzle 3 such as the support column 7 and the valve cylinder 4. Easy to insert and remove, and has a structure that does not require labor and labor for inspection and replacement work.

FIG. 3 is a cross-sectional explanatory view showing the structure of the second example automatic air vent 2b provided on the floating roof plate 1 of the floating roof tank.
The automatic air vent 2b of the second case has a structure in which a plurality of plate-shaped steadying plates 10 are radially fixed to the inner side surface portion 5b of the valve body 5.
The automatic air vent 2b of the second case may have a structure in which a fin or a slide plate is provided on the outer peripheral surface of the sleeve tube 6 together with the steady plate 10.

The automatic air vent 2b of the second case has a structure in which the vibration S of the support column 7 and the inclination angle of the valve body 4 are reduced by restraining the radial movement of the support column 7 installed in the valve cylinder 4 by the steady-state plate 10. Therefore, it is possible to suppress the sleeve tube 6 or the support column 7 from coming into contact with the inner surface of the valve cylinder 4, and to suppress the damage on the valve cylinder 4 side and the generation of the through hole P.
Since the steady rest plate 10 is positioned between the upper outer peripheral surface of the valve cylinder 4 and the inner side surface portion 5b of the valve body 5, the long and heavy column 7 is provided with the automatic air vent mounting nozzle 3 and the valve cylinder 4 The steady rest plate 10 can be inspected and replaced without being pulled out of the device. Therefore, there is no need to provide a temporary mount for pulling out a long and heavy support column, and it is possible to reduce labor and labor required for checking and replacing the automatic air vent 2b. In addition, the state of the steady rest plate 10 can be easily confirmed on the floating roof plate 1, and maintenance management of the automatic air vent 2b is easy.

FIG. 4 is a plan view and a cross-sectional explanatory view showing a first example of the detailed structure of the B part in FIG. 3, showing a cross-sectional view in the lower part and a plan view of the aa part in the upper part.
The steady plate 10a has a structure that is fixed by the inner side surface portion 5b of the valve body 5 and two bolts 16a at the top and bottom, and the height of the steady plate 10a and the valve cylinder 4 when the floating roof plate 1 is lowered. It shall have a length that can secure the allowance for the direction.
Further, the steady rest plate 10a secures a necessary clearance L2 between the side surface portion of the inner edge thereof and the outer surface portion of the valve cylinder 4, and can be inserted and removed from the automatic air vent mounting nozzle 3 such as the support column 7 and the valve cylinder 4. Make the structure easy and do not require labor and labor for inspection and replacement work. Further, the clearance L2 is set to a size that prevents the steady rest plate 10a from interfering with the gasket 19 when the tank is used or when the column 7 is inspected and replaced.
Further, the anti-sway plate 10a is shown in FIG. 4 so that when the valve body 5 rises and the anti-sway plate 10a is placed on the upper end of the valve cylinder 4, the valve body 5 slides down and returns to the normal position. It is good also as a structure which provided the inclination in the lower part as shown.

5A and 5B are a plan view and a cross-sectional explanatory view showing a second example of the detailed structure of the B part in FIG. 3, showing a cross-sectional view at the bottom and a plan view of the bb part at the top.
The steadying plate 10b has a structure that is fixed by the inner side surface portion 5b of the valve body 5 and two bolts 16a at the upper and lower portions.
The steady plate 10b installed on the inner side surface portion 5b of the valve body 5 includes a flat slide plate 11 in which a tip portion on the outer wall side of the valve cylinder 4 is bent into an L shape, a U shape, etc. A structure in which the nut 12 and the like are joined, and when the support column 7 and the like vibrate S, the side surface portion of the inner edge of the slide plate 11 is in surface contact with the outer surface side of the valve cylinder 4 in a wide area. Alternatively, the slide plate 11 may be omitted, and the leading end of the steady stop plate 10b on the outer wall side of the valve cylinder 4 may be bent into an L shape or a U shape.
The steady-rest plate 10b and the slide plate 11 have a length that can secure a stacking height in the height direction of the steady-state plate 10b and the slide plate 11 and the valve cylinder 4 in a state where the floating roof plate 1 is lowered. Shall.
Further, the slide plate 11 secures a necessary clearance L2 between the side surface portion of the inner edge thereof and the outer surface portion of the valve cylinder 4, and can be easily inserted and removed from the automatic air vent mounting nozzle 3 such as the column 7 and the valve cylinder 4. In addition, the inspection and replacement work will not take time and effort. The clearance L2 is set to a size that prevents the gasket 19 from coming off due to the slide plate 11 interfering with the gasket 19 when the tank is used or when the column 7 is inspected and replaced.
Furthermore, the slide plate 11 has a lower end of the slide plate 11 as shown in FIG. 5 in order to suppress the risk of damaging the outer surface side of the valve cylinder 4 when the column 7 vibrates S and contacts the outer surface side of the valve cylinder 4. It is good also as a structure which chamfered the corner | angular part.

FIG. 6 is a plan view and a cross-sectional explanatory view showing a third example of the detailed structure of the B part in FIG. 3, showing a cross-sectional view in the lower part and a plan view of the cc part in the upper part.
The steady rest plate 10b has a structure having a groove 10c fitted into the side surface portion 5b of the valve body 5 from below, and the groove 10c in a state where the side surface portion 5b of the valve body 5 is fitted into the groove 10c. The valve body 5 is fixed by two bolts and nuts 16b at the top and bottom.
The steadying plate 10b and the groove 10c are fixed to each other by welding or the like.
The steady-rest plate 10b and the slide plate 11 have a length that can secure a stacking height in the height direction of the steady-state plate 10b and the slide plate 11 and the valve cylinder 4 in a state where the floating roof plate 1 is lowered. Shall.

When the slide plate 11 has the above-described structure, when the slide plate 11 and the outer surface of the valve cylinder 4 are in contact with each other, the outer surface of the valve cylinder 4 and the inner edge side surface of the slide plate 11 are in surface contact with each other over a wide area. It is possible to disperse the load on the valve cylinder 4 and suppress the damage on the side of the valve cylinder 4 and the generation of the through hole P.

In the case of a floating roof type tank for storing flammable liquid such as crude oil, a member used for the steady rest plate 10 or the slide plate 11 is made of a non-spark material, and sparks are brought into contact with the outer surface side of the steel valve cylinder 4. Make sure that does not occur.
Further, by adopting a structure in which the steady plate 10 is detachably fixed with bolts 16, the steady plate 10 and the slide plate 11 can be exchanged on the floating roof plate 1 without opening the automatic air vent 2. Therefore, the maintenance management of the automatic air vent 2 is easy.

In addition, the structure of the above-described fin, slide plate, and steadying plate is not limited to the above-described structure, and various structures can be employed. For example, it is possible to employ a structure in which a steel fin or a steady rest plate is covered with a non-spark material such as hard rubber, or a structure in which the non-spark material is sandwiched and fixed by two steel fins.
Further, the method of fixing the steady rest plate 10 to the valve body 5 is not limited to bolts and nuts, but may be a structure of fixing by welding or the like.

The fin mounting structure for automatic air venting of the floating roof type tank according to the present invention is not limited to the floating roof type tank, and can be applied to various air vents having a vertically moving structure.

DESCRIPTION OF SYMBOLS 1 Floating roof board 2 Automatic air vent 2a Automatic air vent 2b of 1st example Automatic air vent of 2nd example 3 Automatic air vent mounting nozzle 4 Valve cylinder 4a Valve port 5 Valve body 5a Through hole 5b Valve body side part 6 Sleeve pipe 6a Bolt hole 7 Post 7a Bolt hole 8 Two-stage structure fin 8a Upper fin 8b Lower fin 9 Two-stage structure slide plate 9a Upper slide plate 9b Lower slide plate 10 Stabilization plate 10a First case steady plate 10b Second case steady Plate 11 Slide plate 12 Bolt / nut 13 Conventional fin 14 Conventional slide plate 15 Bolt / nut 16 Bolt 16a Bolt 16b Bolt / nut 17 Conventional automatic air vent 18 Bolt / nut 19 Gasket

M Stirring flow of contents by tank mixer S Vibration of valve body 5 Through hole V Air or steam

Claims (3)

An automatic air vent structure provided on a floating roof plate of a floating roof tank, wherein the automatic air vent is connected in an upright manner to an automatic air vent mounting nozzle installed on an upper portion of the floating roof plate and an upper portion of the automatic air vent mounting nozzle. A shell-shaped valve that has a valve cylinder and has a valve opening on the upper part of the valve cylinder, and opens and closes the valve opening in close contact with or separating from the upper end of the valve cylinder as the floating roof plate moves up and down. Body, a sleeve tube inserted vertically through a through hole provided in the central portion of the valve body, and a support column penetrating through the sleeve tube, and the sleeve tube includes a plurality of sleeve tubes on the outer peripheral surface. An automatic air vent for a floating roof tank, characterized in that it has a structure having fins of two-stage upper and lower structure in which flat plates are fixed radially.
An automatic air vent structure provided on a floating roof plate of a floating roof tank, wherein the automatic air vent is connected in an upright manner to an automatic air vent mounting nozzle installed on an upper portion of the floating roof plate and an upper portion of the automatic air vent mounting nozzle. A shell-shaped valve that has a valve cylinder and has a valve opening on the upper part of the valve cylinder, and opens and closes the valve opening in close contact with or separating from the upper end of the valve cylinder as the floating roof plate moves up and down. Comprising a body, a sleeve tube inserted vertically through a through hole provided in the central portion of the valve body, and a support column penetrating through the sleeve tube. An automatic air vent for a floating roof tank characterized by having a steady-state plate with a structure in which flat plates are fixed radially.
The fin or the steady rest plate is a flat plate obtained by bending the tip portion that becomes the valve wall surface side, or is joined to a flat slide plate that is bent the tip portion that is the valve wall surface side at an arbitrary overlap. 3. The automatic air vent of a floating roof type tank according to claim 1, wherein the fin or the steady plate is in a structure in surface contact with the valve cylinder.

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