JP6519295B2 - Sealant for floating roof tank - Google Patents

Description

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

  A floating roof tank having a floating roof disposed inside the tank is known as a storage tank for petroleum and chemical solutions. The floating roof floats on the upper surface of the liquid stored in the tank, and thus 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 for sealing this gap is installed (see, for example, Patent Document 1). Heretofore, this sealing material has a structure in which a buffer such as urethane foam is filled inside a cylindrical body mainly made of rubber. Alternatively, an inner bag is disposed inside the tubular body, and the inner bag is filled with a liquid.

  Since this seal 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, buffer materials such as urethane foam are permanently deformed over time and the sealing performance is degraded. There's a problem. Further, in the case of the structure in which the inner bag inside the cylindrical body is filled with the liquid, there is a problem that the operation of the liquid injection and the maintenance becomes complicated. In addition, there is also a problem that the inner bag is damaged and the filled liquid leaks out. Therefore, there has been a demand for a sealing material for a floating roof tank that can ensure stable sealing performance for a long time and has excellent maintainability.

Unexamined-Japanese-Patent No. 2012-148787

  An object of the present invention is to provide a sealing material for a floating roof tank, which can ensure stable sealing performance for a long time and is excellent in maintainability.

  In order to achieve the above object, the sealing material for a floating roof tank according to the present invention is attached to the peripheral edge of the floating roof and is installed between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof In a sealing material for a tank, a tubular body mainly made of rubber attached to the periphery along the periphery of the floating roof and formed annularly, and the tubular body inside the tubular body. And an annularly formed inner bag, the inner bag being formed into an annular shape by connecting a plurality of circumferentially divided divided bodies, the inner bag being formed by The cylinder seals the space between the inner surface of the side peripheral wall of the tank and the peripheral edge of the floating roof by the pressure, and when the internal pressure of the divided body becomes smaller than a preset lower limit, circumferentially It is characterized in that it is configured to communicate with the adjacent divided bodies.

  According to the present invention, the inside of the tubular body attached to the periphery of the floating roof and formed annularly is provided with an inner bag disposed along the tubular body and formed annularly, Since the tubular body seals between the inner surface of the side peripheral wall of the tank and the peripheral portion of the floating roof by the pressure of air filled inside the bag, the inner bag is permanently deformed over time There is no problem that the sealing performance is lowered, and stable sealing performance can be secured for a long time. In addition, since the inner bag is filled with air rather than liquid, the work of injection and maintenance does not become complicated. Even if the inner bag is damaged, it is air that leaks, so the liquid stored in the tank is not adversely affected. In addition, since the inner bag is formed in an annular shape by connecting a plurality of divided bodies, the installation work for installing the inner bag inside the tubular body is facilitated. Then, when the internal pressure of the divided body becomes smaller than a preset lower limit value, the internal pressure of the lowered divided body is raised by the pressure of the adjacent divided body by communicating with the adjacent divided body in the circumferential direction As a result, stable seal performance can be easily maintained. Furthermore, since the air filled in the inner bag can provide buoyancy, it is advantageous to prevent the problem that the floating roof sinks under unexpected circumstances.

  Here, the divided bodies adjacent in the circumferential direction may be connected and communicated via a connection fitting. According to this configuration, the connection and communication operation between the divided bodies is further facilitated, and the connection and communication can be made more reliably.

  The divided bodies adjacent in the circumferential direction may be overlapped and coupled in the circumferential direction. According to this configuration, the pressure of the air filled in the inner bag can be reliably applied to the cylindrical body also at the connection boundary between the divided bodies. Along with this, it becomes possible to substantially eliminate the circumferential variation of the sealing performance of the tubular body formed in an annular shape. At this time, for example, one end of the divided body in the circumferential direction is formed in a convex shape, and the other end in the circumferential direction is formed in a recessed shape. The part is fitted into the other end of the concave circumferential direction. Thereby, the divided bodies adjacent in 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 of FIG. It is explanatory drawing which illustrates the connection metal fitting before connection by cross sectional view. It is explanatory drawing which illustrates the state which the division bodies connected by the connection metal fitting are communicating in a cross sectional view. It is explanatory drawing which illustrates the state which the division bodies connected by the connection metal fitting do not connect in a cross sectional view.

  Hereafter, the sealing material for floating roof type tanks of this invention is demonstrated based on embodiment shown to the figure.

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

  In this embodiment, one end side of the rubber sheet constituting the cylindrical body 2 is sandwiched between the peripheral portion of the floating roof 10 and the rigid support plate 7. Furthermore, the opposing end portions of the rubber sheet constituting the cylindrical body 2 are fixed to the peripheral edge portion of the floating roof 10 by the attachment member 6 such as a bolt in a state in which the upper end portion of the support plate 7 is sandwiched. In addition, a weather shield 8 is attached to the peripheral edge portion of the floating roof 10 so as to incline upward toward the outside. Therefore, the upper side of the sealing material 1 is covered by the weather shield 8.

  The inner bag 3 is made of, for example, rubber, and is expanded by filling the inside with the air a, and is contracted 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 is smaller than a lower limit value set in advance, the divided bodies 3A communicate with the adjacent divided body 3A in the circumferential direction.

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

  The inlet 5 which extends to the outside of the cylindrical body 2 is provided in any one of the divided bodies 3A. The split body 3A is filled with air a through the inlet 5. Further, a pressure gauge 9 is provided in the divided body 3A, and by referring to the pressure gauge 9, it is possible to grasp the internal pressure P of the divided body 3A.

  In the seal member 1 installed between the inner surface of the side peripheral wall 12 of the tank 11 and the peripheral portion of the floating roof 10, air a is fed into the inner bag 3 by a compressor or the like to be expanded. The cylindrical 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. As a result, a sealed state is formed in which the inner surface of the side peripheral wall 12 and the peripheral portion of the floating roof 10 are 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. Along with this, the outer peripheral surfaces of the cylindrical body 2 and the weather shield 8 slide up and down 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, the space between the inner surface of the side peripheral wall 12 and the peripheral portion of the floating roof 10 is always Be sealed.

  In addition, since the pressure of the air a filled in the inner bag 3 is used, the sealing material 1 is hardly deformed permanently over time even when used in a compressed state. A much more stable sealing performance can be secured for a long time as compared with the conventional sealing material using a shock absorbing material such as urethane foam.

  Since the inner bag 3 is filled with air a, the injection and maintenance operations are not complicated. Even if the inner bag 3 is damaged, it is the air a that leaks, so it will not be mixed into the liquid L stored in the tank 11 to cause an adverse effect.

  The sealing material 1 of the present invention has the advantage that the air a filled in the inner bag 3 can provide a greater buoyancy than in the prior art. For example, the floating roof 10 may shake greatly in 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 large number of man-hours are required for restoration work. However, by using the sealing material 1, the air a imparts a large buoyancy to the floating roof 10, which is extremely advantageous for avoiding the problem that the floating roof 10 sinks. In particular, since considerable buoyancy can be obtained continuously all around the periphery of the floating roof 10, it is very effective for preventing the floating roof 10 from settling.

  Further, in the present invention, since the inner bag 3 is formed by connecting the divided bodies 3A, the installation 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, which facilitates the operation and is also advantageous in cost control required for replacement and repair.

  Furthermore, when the internal pressure P of the divided body 3A becomes smaller than a preset lower limit value due to some cause, the divided bodies 3A communicate with each other in the circumferential direction. As a result, since the internal pressure P of the lowered divided body 3A can be increased by the pressure of the adjacent divided bodies 3A, stable seal performance can be easily maintained.

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

  The connection 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 a communication passage 20a which penetrates the side wall inward and outward is formed. The head 14 has a cylindrical shape, and both ends are opened to the circumferential surface, and a communication passage 14 a penetrating the head 14 is formed. 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. A rubber O-ring 19 is provided on the inner peripheral surface of 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 13a. The head 14 is joined to the front end 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. The shaft 15 is movably inserted through 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 stopper 18 prevents the shaft 15 from coming out of the guide wall 17.

  The other connection fitting 4 b includes a main body 13 b and an O-ring 19. The main body portion 13 b is a cylindrical metal fitting whose one bottom surface is closed, and a communication passage 20 b which penetrates the side wall to the inside and outside is formed. 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 size as the inner diameter of the one main body 13a. An O-ring 19 is provided on the front end face of the main body portion 13 b in order to ensure the sealing property between the main body portions 13 a and 13 b when they are connected.

  The connection fitting 4a and the connection fitting 4b are connected with their tip openings facing each other as illustrated in FIG. Thus, the head 14 is disposed in the internal space formed by the connection fittings 4a and 4b. In this state, when the internal pressure P of the divided body 3A on the side to which the connection fitting 4b is attached is smaller than the lower limit value set in advance, the head 14 to which the internal pressure P acts through the pressure application passage 21 At the same time, the biasing force of the spring 16 causes the connector to move forward toward the connection fitting 4b. As a result, the communication passage 14a brings the communication passage 20a and the communication passage 20b into communication with each other. Then, air a of the divided body 3A having a relatively large internal pressure P on the side where the divided bodies 3A communicate with each other and the connection metal fitting 4a is attached is connected to the connection metal fitting 4b through the communication passage 20a, the communication passage 14a and the communication passage 20b. It flows into the divided body 3A with a relatively small internal pressure P on the attached side.

  Then, when the internal pressure P of the divided body 3A on the side to which the connection fitting 4b is attached becomes larger than a lower limit value set in advance, the internal pressure P acts on the head 14 through the pressurizing passage 21. Thereby, as illustrated in FIG. 6, the head 14 is retracted with respect to the connection fitting 4 b by the internal pressure P against the biasing force of the spring 16. Therefore, the communication through the communication paths 14a, 20a, 20b is interrupted, and the adjacent divided bodies 3A do not communicate with each other.

  When the divided bodies 3A are connected to each other via such connection fittings 4a and 4b, the connection and communication operation between the divided bodies 3A is further facilitated, and the connection can be performed more reliably. In addition, when the connection fittings 4a and 4b are used, if air a is injected from one divided body 3A, air a is added to all the divided bodies 3A connected until the internal pressure P reaches a preset lower limit value. It can be filled. The lower limit value of the internal pressure P can be adjusted to an arbitrary pressure by changing the biasing force of the spring 16.

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

  If the inner bag 3 is configured to overlap adjacent divided bodies 3A in the circumferential direction as in this embodiment, the pressure of the air a filled in the inner bag 3 can be reliably ensured even at the connection boundary between the divided bodies 3A. The tubular body 2 can be made to act and press. Therefore, it becomes 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 adjacent divided bodies 3A overlap in the circumferential direction is not limited to the structure illustrated in FIG. 3, and various structures can be adopted. For example, inclined surfaces are provided at both end portions in the circumferential direction of each divided body 3A, and the inclined surfaces are made to face each other and connected. That is, the side view shape of the divided body 3A is made parallelogram or trapezoid. Then, the divided body 3A is disposed in a direction in which the inner peripheral side of the side peripheral wall 12 of the tank 11 of the cylindrical body 2 and the peripheral edge side of the floating roof 10 can be pressed at the portion where the divided bodies 3A overlap. When the divided bodies 3A have the overlap structure illustrated in FIG. 3, the divided bodies 3A adjacent in the circumferential direction can be connected more stably.

DESCRIPTION OF SYMBOLS 1 Seal material 2 Tubular body 2A Split body 2a Reinforcement layer 3 Inner bag 3A Split body 4a, 4b Connection 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 Part 14 Head 14a Communication passage 15 Shaft 16 Spring 17 Guide wall 18 Stopper 19 O ring 20a 20b Communication passage 21 Pressure application passage a Air L Liquid P Internal pressure

Claims (4)

In a sealing material for 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 attached to the peripheral edge along the peripheral edge of the floating roof and formed annularly, and is disposed along the cylindrical body inside the cylindrical body to form an annular The inner body is formed into an annular shape by connecting a plurality of circumferentially divided divided bodies, and the tubular body is formed by the pressure of air filled in the inner side of the inner body. Connects 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, it communicates with the adjacent divided bodies in the circumferential direction A sealing material for a floating roof tank characterized in that   The sealing material for a floating roof tank according to claim 1, wherein the divided bodies adjacent in the circumferential direction are connected and communicated via a connection fitting.   The sealing material for floating roof type tanks according to claim 1 or 2, wherein the divided bodies adjacent in the circumferential direction are connected so as to overlap in the circumferential direction.   One end of the divided body in the circumferential direction is formed in a convex shape, and the other end in the circumferential direction is formed in a concave shape, and the convexly formed peripheral one end of the divided body adjacent in the circumferential direction is the recessed periphery. The sealing material for a floating roof tank according to claim 3, which fits into the other end of the direction and fits.

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