JP2016204009A - Sealer for floating roof type tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealer for a floating roof type tank capable of securing a long-lasting stable seal performance as well as an excellent maintainability.SOLUTION: A sealer 1 comprises: a cylindrical body 2 annularly formed of rubber as a main material, attached to a peripheral edge part of a floating roof 10 along the peripheral edge part; and an inner bag 3 annularly formed and disposed along the cylindrical body 2 inside the cylindrical body 2. The sealer 1 is installed in a part between an inner surface of a side peripheral wall 12 of a tank 11 and the peripheral edge part of the floating roof 10. The inner bag 3 is divided in circumferential direction into a plurality of divided bodies 3A, which are connected with each other to form a ring. Thereby, the part between the inner surface of the side peripheral wall 12 of the tank 11 and the peripheral edge part of the floating roof 10 can be sealed by the cylindrical body 2 with a pressure of air a, which is filled in the inner bag 3, wherein the divided bodies 3A adjoining each other in the circumferential direction are communicated with each other when the pressure inside each of the divided bodies 3A becomes lower than a predetermined lower limit value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a floating roof type tank sealing material, and more particularly to a floating roof type tank sealing material that can ensure stable sealing performance for a long period of time and is excellent in maintainability.

  As a storage tank for petroleum and chemical solutions, a floating roof type tank having a floating roof arranged inside the tank is known. Since the floating roof floats on the upper surface of the liquid stored in the tank, the floating roof moves up and down according to the storage amount of the liquid. Since there is a gap between the inner surface of the tank side peripheral wall and the peripheral edge of the floating roof, a sealing material is installed to seal the gap (see, for example, Patent Document 1). Conventionally, this sealing material has a structure in which a cushioning body such as urethane foam is filled in a cylindrical body mainly made of rubber. Alternatively, an inner bag is disposed inside the cylindrical body, and the inner bag is filled with liquid.

  Since this sealing material is sandwiched in a compressed state between the inner surface of the tank side peripheral wall and the peripheral edge of the floating roof, the cushioning body such as urethane foam is permanently deformed over time and the sealing performance is reduced. There's a problem. In addition, in the case of a structure in which the inner bag inside the cylindrical body is filled with liquid, there is a problem that the liquid injection and maintenance work becomes complicated. There is also a problem that the filled liquid leaks due to damage to the inner bag. Therefore, there has been a demand for a floating roof type tank sealing material that can ensure stable sealing performance for a long period of time and has excellent maintainability.

JP 2012-148787 A

  The objective of this invention is providing the sealing material for floating roof type tanks which can ensure the stable sealing performance for a long period of time, and was excellent in maintainability.

  In order to achieve the above object, the floating roof type tank sealing material of the present invention is attached to the peripheral portion of the floating roof, and is installed between the inner surface of the side peripheral wall of the tank and the peripheral portion of the floating roof. In the tank sealing material, a cylindrical body made mainly of rubber that is attached to the peripheral edge portion along the peripheral edge portion of the floating roof and is formed into an annular shape, and the cylindrical body inside the cylindrical body. An inner bag formed in an annular shape arranged along the inner bag, and the inner bag is formed in an annular shape by connecting a plurality of divided bodies divided in the circumferential direction, and the inner bag is filled with air. When the cylindrical body seals between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof by pressure, and the internal pressure of the divided body becomes smaller than a preset lower limit value, It is the structure which communicates with the adjacent division body.

  According to the present invention, an inner bag that is attached to the peripheral edge of a floating roof and is formed in an annular shape is disposed along the tubular body and is formed in an annular shape. Since the cylindrical body seals between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof by the pressure of air filled in the bag, the inner bag is permanently deformed over time. There is no problem that the sealing performance deteriorates, and a stable sealing performance can be secured for a long time. In addition, since it is air rather than liquid that fills the inner bag, the filling and maintenance work does not become complicated. Even if the inner bag is damaged, it is the air that leaks out, so there is no adverse effect on the liquid stored in the tank. In addition, since the inner bag is formed in an annular shape by connecting a plurality of divided bodies, the construction work for installing the inner bag inside the cylindrical body is facilitated. And when the internal pressure of the said division body becomes smaller than the preset lower limit, it communicates with the division body adjacent in the circumferential direction, and raises the internal pressure of the division body which fell by the pressure of the adjacent division body Therefore, it becomes easy to maintain stable sealing performance. Furthermore, since buoyancy is obtained by the air filled in the inner bag, it is advantageous to avoid the problem that the floating roof sinks due to unforeseen circumstances.

  Here, the said division bodies adjacent to the circumferential direction can also be set as the structure connected and connected via a connection metal fitting. According to this configuration, it is possible to more easily connect and communicate the divided bodies, and more reliably connect and communicate with each other.

  It can also be set as the structure which the said division body adjacent in the circumferential direction is overlapped and connected in the circumferential direction. According to this structure, the pressure of the air with which the inner bag was filled can be made to act on a cylindrical body reliably also in the connection boundary of division bodies. Accordingly, it is possible to substantially eliminate the variation in the circumferential direction of the sealing performance of the cylindrical body formed in an annular shape. At this time, for example, one end in the circumferential direction of the divided body is formed in a convex shape, and the other end in the circumferential direction is formed in a concave shape, and the one end in the convex circumferential direction of the divided body adjacent in the circumferential direction. The portion is configured to enter and fit into the other end portion of the concave circumferential direction. Thereby, the division body adjacent to the circumferential direction can be connected more stably.

It is explanatory drawing which illustrates the sealing material for floating roof type tanks of this invention by a longitudinal cross-sectional view. It is explanatory drawing which illustrates the sealing material of FIG. 1 by planar view. It is explanatory drawing which illustrates the internal structure of a sealing material by A arrow view of FIG. It is explanatory drawing which illustrates the connection metal fitting before connection by sectional view. It is explanatory drawing which illustrates the state which the division bodies connected by the connection metal fitting are communicating in cross section. It is explanatory drawing which illustrates the state which the division bodies connected by the connection metal fitting do not communicate with each other in the cross-sectional view.

  Hereinafter, the sealing material for floating roof type tanks of the present invention will be described based on the embodiments shown in the drawings.

  The floating roof type tank sealing material 1 of the present invention illustrated in FIGS. 1 to 3 (hereinafter referred to as sealing material 1) is installed between the inner surface of the side peripheral wall 12 of the tank 11 and the peripheral edge of the floating roof 10. The The sealing material 1 includes a cylindrical body 2 formed in an annular shape using rubber as a main material, and an inner bag 3 that is disposed in the cylindrical body 2 along the cylindrical body 2 and formed in an annular shape. And. The cylindrical body 2 is formed, for example, by forming a rubber sheet in which the reinforcing layer 2 a is embedded in a cylindrical shape, and is attached to the peripheral portion along the peripheral portion of the floating roof 10 by the attachment member 6. The cylindrical body 2 is formed in an annular shape by connecting a plurality of divided bodies 2A divided in the circumferential direction.

  In this embodiment, one end portion side of the rubber sheet constituting the cylindrical body 2 is sandwiched between the peripheral edge portion of the floating roof 10 and the rigid support plate 7. Further, opposite end portions of the rubber sheet constituting the cylindrical body 2 are fixed to the peripheral edge portion of the floating roof 10 by an attachment member 6 such as a bolt with the upper end portion of the support plate 7 sandwiched therebetween. Further, a weather shield 8 that is inclined upward toward the outside is attached to the peripheral edge of the floating roof 10. Accordingly, the upper portion of the sealing material 1 is covered with the weather shield 8.

  The inner bag 3 is made of rubber, for example, and expands by filling the inside with air a, and contracts by discharging the air a. The inner bag 3 is formed in an annular shape by connecting a plurality of divided bodies 3A divided in the circumferential direction. When the internal pressure of the divided body 3A becomes smaller than a preset lower limit value, the divided body 3A communicates with the divided bodies 3A adjacent in the circumferential direction.

  In this embodiment, one end in the circumferential direction of each divided body 3A is formed in a convex shape, and the other end in the circumferential direction is formed in a concave shape. And the convex circumferential one end part of the divided body 3A is configured to enter and fit into the concave circumferential other end part of the divided body 3A adjacent in the circumferential direction. According to the inner bag 3 having this configuration, the convex circumferential one end and the concave circumferential other end of the fitting 3A to be fitted overlap in the circumferential direction.

  Any one divided body 3 </ b> A is provided with an inlet 5 extending to the outside of the cylindrical body 2. The divided body 3A is filled with air a through the inlet 5. Further, the divided body 3A is provided with a pressure gauge 9, and the internal pressure P of the divided body 3A can be grasped by referring to the pressure gauge 9.

  In the sealing material 1 installed between the inner surface of the side peripheral wall 12 of the tank 11 and the peripheral edge of the floating roof 10, air a is sent into the inner bag 3 by a compressor or the like to be expanded. The tubular body 2 presses the inner surface of the side peripheral wall 12 of the tank 11 by the pressure of the expanding inner bag 3, that is, the air a filled in the inner bag 3. Thereby, it will be in the seal state by which the space between the inner surface of the side peripheral wall 12 and the peripheral part of the floating roof 10 was sealed.

  The floating roof 10 floats on the upper surface of the liquid L such as oil stored in the tank 11. Therefore, the floating roof 10 moves up and down according to the storage amount of the liquid L. Accordingly, the outer edge surfaces of the cylindrical body 2 and the weather shield 8 slide up and down on the inner surface of the side peripheral wall 12 of the tank 11. At this time, since the cylindrical body 2 is pressed against the inner surface of the side peripheral wall 12 by the pressure of the air a filled in the inner bag 3, there is always a space between the inner surface of the side peripheral wall 12 and the peripheral edge of the floating roof 10. Sealed.

  Moreover, since the pressure of the air a with which the inner bag 3 was filled is utilized, even if it uses in a compressed state, the sealing material 1 hardly deforms permanently over time. Compared to conventional sealing materials using a cushioning material such as urethane foam, a much more stable sealing performance can be secured for a long period of time.

  Since the inner bag 3 is filled with air a, the filling and maintenance work is not complicated. Even if the inner bag 3 is damaged, it is the air a that leaks out, so that it does not adversely affect the liquid L stored in the tank 11.

  The sealing material 1 of the present invention has an advantage that a larger buoyancy can be obtained by the air a filled in the inner bag 3 than in the prior art. For example, the floating roof 10 may shake greatly due to an unexpected situation such as an earthquake. In such a case, conventionally, the floating roof may sink in the liquid L, and if it sinks, a great number of man-hours are required for the restoration work. However, by using this sealing material 1, air a imparts a large buoyancy to the floating roof 10, which is extremely advantageous in avoiding the problem that the floating roof 10 sinks. In particular, since considerable buoyancy can be obtained continuously over the entire periphery of the floating roof 10, it is very effective in preventing the floating roof 10 from sinking.

  In the present invention, since the inner bag 3 is formed by connecting the divided bodies 3A, the construction work for installing the inner bag 3 inside the cylindrical body 2 is facilitated. When the inner bag 3 is damaged, only the divided body 3A corresponding to the damaged portion needs to be replaced. This facilitates the work and is advantageous for cost reduction required for replacement and repair.

  Further, when the internal pressure P of the divided body 3A becomes smaller than a preset lower limit value for some reason, the divided body 3A communicates with the adjacent divided bodies 3A in the circumferential direction. Thereby, since the lowered internal pressure P of the divided body 3A can be increased by the pressure of the adjacent divided body 3A, it becomes easy to maintain stable sealing performance.

  In this embodiment, the division bodies 3A adjacent to each other in the circumferential direction forming the inner bag 3 are connected and communicated with each other via the connection fittings 4a and 4b. Paired fittings 4a and 4b are fixed to one end and the other end in the circumferential direction of each divided body 3A. These connecting fittings 4a and 4b are structured to be connected to and disconnected from each other, and connect the connected divided bodies 3A when the internal pressure P of the divided bodies 3A becomes lower than a preset lower limit value.

  The connecting metal fittings 4a and 4b will be described in detail with reference to FIGS.

  One connection fitting 4 a includes a main body 13 a, a head 14, a shaft 15, a spring 16, a guide wall 17, a stopper 18, and an O-ring 19.

  The main body portion 13a is a cylindrical metal fitting whose one bottom surface is closed, and is formed with a communication passage 20a penetrating the side wall inward and outward. The head 14 has a columnar shape, and a communication path 14a is formed through the head 14 with both ends opened to the peripheral surface. The outer diameter of the head 14 is substantially the same as the inner diameter of the main body 13a, and the head 14 is disposed inside the main body 13a. In order to close the gap between the outer peripheral surface of the head 14 and the inner peripheral surface of the main body portion 13a, a rubber O-ring 19 is provided on the inner peripheral surface of the main body portion 13a. The head 14 is joined to the tip of the shaft 15, and a stopper 18 is joined to the rear end of the shaft 15. A guide wall 17 is provided between the stopper 18 and the head 14. A shaft 15 is movably inserted into the guide wall 17. A spring 16 through which the shaft 15 is inserted is provided between the head 14 and the guide wall 17. The head 14 is biased forward by the biasing force of the spring 16, and the shaft 15 is prevented from coming out of the guide wall 17 by the stopper 18.

  The other connecting bracket 4 b includes a main body portion 13 b and an O-ring 19. The main body portion 13b is a cylindrical metal fitting whose one bottom surface is closed, and is formed with a communication passage 20b that penetrates the side wall inward and outward. Further, a pressurizing passage 21 communicating with the inside of the divided body 3A is formed on the bottom surface. The inner diameter of the main body 13b is substantially the same as the inner diameter of one main body 13a. An O-ring 19 is provided on the front end surface of the main body portion 13b in order to ensure sealing between the main body portions 13a and 13b when they are connected to each other.

  As illustrated in FIG. 5, the connection fitting 4 a and the connection fitting 4 b are connected to each other with their tip openings facing each other. Thereby, the head 14 is arrange | positioned in the internal space formed of the connection metal fittings 4a and 4b. In this state, when the internal pressure P of the divided body 3A on the side to which the connecting metal fitting 4b is attached is smaller than a preset lower limit value, the head 14 on which the internal pressure P is acting through the pressurizing passage 21 is applied to the internal pressure P. It opposes and moves forward toward the connection metal fitting 4b by the urging force of the spring 16. Thereby, the communicating path 14a makes the communicating path 20a and the communicating path 20b communicate. Then, the divided bodies 3A communicate with each other, and the air a of the divided body 3A having a relatively large internal pressure P on the side where the connecting metal fitting 4a is attached is connected to the connecting metal fitting 4b through the communication path 20a, the communication path 14a, and the communication path 20b. It flows into the divided body 3A having a relatively small internal pressure P on the attached side.

  When the internal pressure P of the divided body 3A on the side to which the connecting metal fitting 4b is attached becomes larger than a preset lower limit value, the internal pressure P acts on the head 14 through the pressurizing passage 21. Thereby, the head 14 moves backward with respect to the connection fitting 4b by the internal pressure P against the urging force of the spring 16 as illustrated in FIG. Therefore, the communication through the communication passages 14a, 20a, and 20b is blocked, and the adjacent divided bodies 3A are not in communication with each other.

  When the divided bodies 3A are connected to each other through the connecting metal fittings 4a and 4b, the divided bodies 3A can be connected and communicated with each other more easily and more reliably. Moreover, if this connection metal fitting 4a, 4b is used, if the air a is inject | poured from one division body 3A, air a will be supplied to all the division bodies 3A connected until the internal pressure P becomes the preset lower limit. Can be filled. The lower limit value of the internal pressure P can be adjusted to an arbitrary pressure by changing the urging force of the spring 16.

  The structure of the connection fittings 4a and 4b is not limited to the structure illustrated in FIGS. 4 to 6, and various structures can be employed. In addition, not only the illustrated spring 16 but various biasing members, such as an elastic material, can be used.

  As in this embodiment, when the inner bags 3 are configured so that the adjacent divided bodies 3A overlap in the circumferential direction, the pressure of the air a filled in the inner bags 3 can be ensured even at the connection boundary between the divided bodies 3A. It can act on the cylindrical body 2 and can be pressed. Therefore, it is possible to substantially eliminate the variation in the circumferential direction of the sealing performance of the tubular body 2 formed in an annular shape.

  The structure in which the adjacent divided bodies 3A are overlapped in the circumferential direction is not limited to the structure illustrated in FIG. 3, and various structures can be employed. For example, inclined surfaces are provided at both circumferential ends of each divided body 3A, and the inclined surfaces are opposed to each other and connected. That is, the side view shape of the divided body 3A is a parallelogram or a trapezoid. And the division body 3A is arrange | positioned in the direction which can press the inner peripheral side of the side peripheral wall 12 of the tank 11 of the cylindrical body 2, and the peripheral part side of the floating roof 10 in the part which 3A of division bodies overlapped. In addition, if the division body 3A is made into the overlap structure illustrated in FIG. 3, the division body 3A adjacent to the circumferential direction can be connected more stably.

DESCRIPTION OF SYMBOLS 1 Sealing material 2 Cylindrical body 2A Divided body 2a Reinforcement layer 3 Inner bag 3A Divided body 4a, 4b Connection metal fitting 5 Inlet 6 Mounting member 7 Support plate 8 Weather shield 9 Pressure gauge 10 Floating roof 11 Tank 12 Side peripheral wall 13a 13b Main body Portion 14 Head 14a Communication passage 15 Shaft 16 Spring 17 Guide wall 18 Stopper 19 O-ring 20a 20b Communication passage 21 Pressurization passage a Air L Liquid P Internal pressure

Claims (4)

In the sealing material for the floating roof type tank attached to the peripheral edge of the floating roof and installed between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof,
A cylindrical body mainly made of rubber that is attached to the peripheral edge of the floating roof and formed in an annular shape along the peripheral edge of the floating roof, and is annularly arranged along the cylindrical body inside the cylindrical body And the inner bag is formed into an annular shape by connecting a plurality of divided bodies divided in the circumferential direction, and the tubular body is formed by the pressure of the air filled in the inner bag. Seals between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof, and when the internal pressure of the divided body becomes smaller than a preset lower limit value, it communicates with the divided bodies adjacent in the circumferential direction. A sealing material for a floating roof type tank, characterized in that   The sealing material for a floating roof type tank according to claim 1, wherein the divided bodies adjacent in the circumferential direction are connected and communicated with each other via a connection fitting.   The sealing material for a floating roof type tank according to claim 1 or 2, wherein the divided bodies adjacent to each other in the circumferential direction are connected so as to overlap in the circumferential direction.   One end in the circumferential direction of the divided body is formed in a convex shape, the other end in the circumferential direction is formed in a concave shape, and one end in the convex circumferential direction of the divided body adjacent in the circumferential direction is formed in the concave circumference. The sealing material for a floating roof type tank according to claim 3, which enters and fits in the other end portion in the direction.

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