JP5486902B2 - Floating roof tank and weather sealing device for floating roof tank - Google Patents

Description

  The present invention generally relates to a structure of a floating roof type tank that stores oil or the like as a stored liquid, and more particularly, rainwater entering the tank by shielding between the floating roof and the tank outer wall (side plate) in the floating roof type tank. The present invention relates to a weather seal device for preventing intrusion, and a floating roof tank equipped with such a weather seal device.

  Conventionally, as a typical floating roof tank, a so-called pontoon type floating roof tank in which an annular floating box (pontoon) is formed on the outer peripheral portion of the floating roof, thereby providing the roof with buoyancy. Is well known.

  Usually, a floating roof of a floating roof type tank is equipped with a rainwater intrusion prevention device for shielding rainwater from entering the tank by shielding between the outer periphery of the floating roof and the tank side plate, that is, a weather seal device. It has been. Various techniques have been known for weather sealing devices.

  FIG. 5 shows an example of a conventional weather seal device. FIG. 5 shows a schematic configuration of the weather seal device 10 arranged to shield the gap between the pontoon 101 provided on the outer periphery of the floating roof 100 in the floating roof type tank 1 and the tank side plate 200.

  In this example, the floating roof type tank 1 includes an annular envelope 102a made of, for example, an oil-resistant synthetic rubber, and a urethane foam 102b disposed in the envelope 102a on the outer peripheral portion of the floating roof 100. The floating roof seal 102 is installed, the evaporation of the liquid stored in the tank from the outer periphery of the floating roof 100, that is, between the outer peripheral side wall (outer rim) 103 of the pontoon and the tank side plate 200, and rainwater from the outside Intrusion is prevented.

  Further, a weather seal device 10 is disposed above the floating roof seal 102 in order to prevent rainwater from entering between the outer peripheral side wall 103 of the pontoon 101 and the tank outer wall 200. The side wall 103 and the tank side plate 200 are shielded.

  That is, the weather seal device 10 is disposed in the vicinity of the outer peripheral side wall 103 of the pontoon 101, and has a weather hood main body 11a extending upwardly from the roof plate 104 of the pontoon 101 to the tank side plate 200, and the weather hood main body 11a. A weather hood 11 having a seal member 11b attached to the upper end of the hood. At the upper end side of the weather hood 11, the seal member 11b is elastically in contact with the tank side plate 200, and the lower end side opposite to the side where the seal member 11b is attached is fixed to the roof plate 104 of the pontoon 101. It is fixedly attached to the mounting base 105.

  This configuration prevents rainwater from entering the tank from between the outer peripheral side wall 103 of the pontoon 101 and the tank side plate 200. However, it is still not fully satisfactory.

  In Patent Document 1, as shown in FIG. 6, two plate-like rubber seal plates 11b1 and 11b2 each having an edge-shaped contact point edge as a sealing member are provided at the tip of the weather hood main body 11a of the weather hood 11 in FIG. A configuration in which the sheets are used in a stacked manner is disclosed. However, if the rubber seal plates 11b1 and 11b2 are simply attached to the weather hood 11, there is a problem in that it is difficult to maintain the desired performance because the rubber is drowned or caught as the floating roof moves up and down.

  In order to prevent this, several complicated mechanisms have been considered and proposed. For example, in Patent Document 2, a packing attachment 110 is provided as a seal member at the tip of the weather hood main body 11a in FIG. 7 so as to be swingable with respect to the weather hood main body 11a, and the tank side plate 200 is attached to the packing attachment 110. A sliding plate 111 for sliding the inner wall surface 200a and a resilient packing material 112 for sliding the inner wall surface 200a of the tank are attached. A different structure is disclosed.

  However, this structure increases the load on the weather hood 11 and is considered to have an undesirable effect on the structure. Moreover, it is unavoidably expensive to make these modifications to existing floating roof tanks.

  As a relatively simple device, for example, one having a structure as described in Patent Document 3 has been proposed.

  That is, at the tip of the weather hood main body 11a in FIG. 8, as a seal member at the tip of the weather hood 11, a rainwater tank 115 made of an elastic seal body such as chloroprene rubber, and an earth member that is in contact with the tank side plate 200 at the top of the rainwater tank 115 116 is disclosed.

  However, considering that both the wide rain gutter 115 and the ground member 116 must be in close contact with the curved tank side plate 200, and considering that the tank is not a perfect circle and has some distortion, It seems that there are difficulties in maintaining the function.

Japanese Utility Model Publication No. 61-59591 Japanese Utility Model Publication No. 2-73196 Japanese Patent Laid-Open No. 6-1391

  Due to the above-described background, an effective and inexpensive weather seal device that can prevent rainwater from entering the floating roof tank through the side plate has not been widely used.

  Accordingly, an object of the present invention is to solve the above-described problems, and can effectively prevent rainwater from entering the floating roof tank, and can be easily attached to an existing floating roof tank. An object of the present invention is to provide a weather sealing device for a floating roof type tank and a floating roof type tank equipped with such a weather sealing device.

The above object is achieved by a weather seal device according to the present invention and a floating roof tank equipped with such a weather seal device. In summary, according to the first aspect of the present invention, in the circumferential direction of the tank side plate, the gap between the tank side plate of the floating roof type tank and the outer peripheral side wall of the pontoon constituting the outer peripheral portion of the floating roof is shielded. With arranged weather hood,
The weather hood has a weather hood body and a conductive seal guide attached to the upper end of the weather hood body,
The seal guide is in elastic contact with the tank side plate, and the lower end of the weather hood body is a weather seal device attached to a floating roof,
A plate-like elastic seal member having a predetermined thickness and disposed on the outer surface of the seal guide;
A spring plate disposed on the outer surface of the elastic seal member;
The spring plate and the elastic seal member are attached to the weather hood by a fixture, the tip of the elastic seal member is urged toward the tank side plate by the spring plate, and is brought into contact with the weather hood .
The conductive seal guide is a flat plate-like support portion attached to the weather hood main body, and extends from the support portion toward the tank side plate and protrudes toward the tank side plate. A substantially semicircular curved portion, wherein the curved portion is in contact with an inner wall surface of the tank side plate, the curved portion opening is opened toward the elastic seal member, and the support portion is located above the weather hood main body. Attached to the end,
The elastic seal member has a lower end attached to the support portion of the seal guide with a spacer interposed therebetween, and the elastic seal member closes the opening of the seal guide so as to close the tank side plate. There is provided a weather sealing device for a floating roof type tank, characterized in that the upper end of the elastic seal member is in contact with the inner wall surface of the tank side plate .

According to one embodiment of the present invention, the elastic sealing member has a thickness of 8Mm～15mm, hardness is 50 to 70 in Type A durometer method rubber hardness, conductivity, the volume resistivity 1 × 10 ² to 1 × 10 ⁶ Ω · cm.

  According to another embodiment of the present invention, the elastic seal member is inclined such that the upper region of the elastic seal member that contacts the inner wall surface of the tank side plate gradually decreases in thickness toward the tip. .

  According to another embodiment of the present invention, the tip of the elastic seal member has a tip thickness of 2 mm to 5 mm, and the inclined surface portion of the tip starts from a position of 20 mm or less and 10 mm or more from the tip.

  According to another embodiment of the present invention, the elastic seal member is attached to both side edges closely in the circumferential direction along the inner wall surface of the tank side plate, and the elastic seal member is connected to the tank. The weather hood is disposed so as to cover the seam of the weather hood attached to both sides of the side plate in the circumferential direction.

According to the second aspect of the present invention, in the floating roof tank having a weather seal device including a weather hood that shields a gap between the tank side plate and the outer peripheral side wall of the pontoon constituting the outer peripheral portion of the floating roof,
The weather seal device is a weather seal device having any one of the above configurations, and a floating roof tank is provided.

  According to the present invention, rainwater intrusion into a floating roof tank can be effectively prevented, and attachment to an existing floating roof tank can be easily achieved, and is inexpensive.

It is a principal part cross-sectional side view which shows one Example of the weather seal apparatus of the floating roof type tank which concerns on this invention. It is a principal part perspective view which shows one Example of the weather seal apparatus of the floating roof type tank which concerns on this invention. It is an expansion perspective view which shows the front-end | tip shape of the elastic seal member of a weather seal apparatus. It is a principal part cross-sectional side view which shows the other Example of the weather seal apparatus of the floating roof type tank which concerns on this invention. It is a principal part cross-sectional side view which shows an example of the weather seal apparatus of the conventional floating roof type tank. It is a principal part cross-sectional side view which shows the other example of the weather seal apparatus of the conventional floating roof type tank. It is a principal part cross-sectional side view which shows the other example of the weather seal apparatus of the conventional floating roof type tank. It is a principal part cross-sectional side view which shows the other example of the weather seal apparatus of the conventional floating roof type tank.

  Hereinafter, the floating roof tank and the weather seal device according to the present invention will be described in more detail with reference to the drawings.

Example 1
(Overall configuration of floating roof tank)
1 and 2 show a schematic configuration of an embodiment of a floating roof type tank and a weather seal device according to the present invention.

  In this embodiment, the floating roof type tank 1 equipped with the weather seal device of the present invention has the same configuration as the conventional one described with reference to FIG.

  That is, as shown in FIGS. 1 and 2, the floating roof 100 of the floating roof type tank 1 is provided with a pontoon 101 on the outer peripheral portion thereof, and the weather seal device 10 includes an outer peripheral side wall (vertical wall) of the pontoon 101. 103 and a tank outer peripheral wall constituting the tank main body, that is, the tank side plate 200 is located above an annular region (gap) formed between the tank side plate 200 and the tank side plate 200.

  In addition, the floating roof tank 1 is arranged on the outer peripheral portion of the floating roof 100, that is, on the outer peripheral side wall 103 of the pontoon 101, for example, an annular envelope 102a made of oil-resistant synthetic rubber, and the envelope 102a. A floating roof seal 102 provided with an elastic body 102b such as urethane foam is installed. The floating roof seal 102 prevents evaporation of the liquid stored in the tank from between the outer peripheral side wall 103 of the pontoon 101 and the tank outer wall 200 and the intrusion of rainwater from the outside into the tank.

  Further, as described above, the weather seal device 10 is arranged above the floating roof seal 102 in order to prevent rainwater from entering between the outer peripheral side wall 103 of the pontoon 101 and the tank side plate 200, The space between the outer peripheral side wall 103 of the floating roof 100 and the tank side plate 200 is shielded.

  According to this embodiment, the weather seal device 10 is a cover member made of, for example, a rectangular steel plate extending upwardly from the roof plate 104 of the pontoon 101 to the tank side plate 200, that is, a weather hood. 11. The weather hood 11 is arranged continuously in the circumferential direction of the tank side plate 200, that is, in close contact with each other. Each weather hood 11 has a weather hood body 11a and a seal guide 11b made of a conductive member attached to the upper end 11a1 of the weather hood body 11a. In this embodiment, the seal guide 11b is made of brass. However, the seal guide 11b is not limited to this, and copper or the like can also be used.

  As described above, the seal guide 11b is attached to the upper end side of the weather hood 11, that is, the upper end 11a1 of the weather hood main body 11a, and the seal guide 11b is in elastic contact with the tank outer wall 200. The lower end side opposite to the side on which the seal guide 11b is attached, that is, the lower end 11a2 of the weather hood main body 11a is rotated up and down by a hinge member 107 on a mounting base 105 provided on the roof plate 104 of the pontoon 101. Installed as possible. Thereby, even when the floating roof 100 is raised or lowered, even if there is some distortion in the tank side plate 200, the tank side plate 200, the seal guide 11b, and the rubber plate 20 which is an elastic seal member described later are good. Contact is maintained. Moreover, it is possible to prevent an excessive load from being applied to the weather hood 11.

  The method of attaching the lower end side of the weather hood 11, that is, the lower end 11 a 2 of the weather hood main body 11 a to the pontoon 101 is not limited to this, and as shown in FIG. 4, the upper end of the pontoon via a holding member 106. You may attach to the part 103a. Further, for example, similarly to the configuration shown in FIG. 5 described above, it may be fixedly attached to the mounting base 105 provided on the roof plate 104 of the pontoon 101. In addition, various attachment methods can be adopted.

  The seal guide 11b includes a support portion 11b1 having a flat plate shape, and a contact portion 11b2 extending from the support portion 11b1 toward the tank side plate 200. That is, the contact portion 11b2 extends from the support portion 11b1 toward the tank side plate 200, protrudes toward the tank side plate 200, and is curved in a substantially semicircular shape. The curved portion (contact portion) 11b2 Is in contact with the inner wall surface 200a of the tank side plate 200, and the curved opening 11b3 is disposed so as to open toward the center of the tank 1 and slightly upward.

  The support portion 11b1 of the seal guide 11b is attached to the surface of the weather hood main body 11a opposite to the side facing the inner wall surface 200a of the tank side plate 200, that is, the outer surface of the weather hood main body 11a. A rubber plate 20, which is a plate-like elastic seal member having a substantially rectangular shape superimposed on the outer surface, is attached.

  That is, the lower end 20a of the rubber plate 20 is attached to the support portion 11b1 of the seal guide 11b with the liner (ie, spacer) 30 therebetween. The rubber plate 20 extends to the inner wall surface 200a of the tank side plate 200 so as to close the opening 11b3 of the seal guide 11b, and the tip 20b2 of the upper tip region 20b of the rubber plate 20 is the inner wall surface 200a of the tank side plate 200. It is made to contact | abut. The upper tip end region 20b of the rubber plate 20 is formed so as to be inclined so that the thickness gradually becomes smaller (that is, thinner) as it goes to the tip 20b2. The material of the rubber plate 20 and the upper end shape will be described in detail later.

  Further, as described above, the spacer 30 is installed between the lower end 20a of the rubber plate 20 and the upper end 11a1 of the weather hood main body 11a, which are the attachment positions of the rubber plate 20 and the weather hood 11, and this thickness is set. By adjusting, even if there is some distortion in the tank side plate 200, the rubber plate 20 can be installed straight on site. The thickness (T3) of the spacer 30 can be adjusted by, for example, stacking a plurality of 6 mm thick ones if necessary, but a plurality of thicknesses can be prepared and appropriately selected and used. You can also. The width (W30) of the spacer 30 in the circumferential direction of the tank is generally preferably about the width (W1) of the weather hood body 11a. The length (L30) in the direction orthogonal to the width W30 may be about 40 mm.

  Further, the spring plate 40 is provided over the lower region of the rubber plate 20, that is, the region corresponding to the region between the seal guide curved portion distal end position 11b4 from the attachment position of the rubber plate 20 to the seal guide support portion 11b1 by the fixture 50. It is done. In this embodiment, the spring plate 40 is made of brass, but is not limited to this.

  As understood with reference to FIG. 2, the weather hood main body 11a and the seal guide 11b are attached to both side edges 11c in close contact with each other in the circumferential direction along the inner wall surface 200a of the tank side plate 200. . The rubber plate 20 having a substantially rectangular shape is also continuously arranged in the circumferential direction along the inner wall surface 200a of the tank side plate 200, and both side edges 20c are attached in close contact with each other. Therefore, in the present embodiment, both the side edge contact portions (seams of the weather hood) 11c formed at predetermined intervals in the circumferential direction of the tank side plate of the weather hood main body 11a and the seal guide 11b, and the rubber plate 20 The side edge contact portions (seam of rubber plates) 20c formed at predetermined intervals in the circumferential direction of the tank side plate are not matched. In this embodiment, the seam 20c of the rubber plate 20 is positioned between the seams 11c of the two weather hoods 11. With this configuration, it was possible to prevent rainwater from leaking from the seam 11c of the weather hood 11 into the tank as much as possible.

  Further, the spring plate 40 can be the same as the circumferential width (W1) along the inner wall surface 200a of the tank side plate 200 of the rubber plate 20, but in this embodiment, the spring plate 40 extends in the width direction of the rubber plate 20. A plurality of them are arranged apart from each other. Usually, the width (W2) is 30 to 70 mm and the length (L2) is 80 to 130 mm. In this example, the width (W2) was 50 mm and the length (L2) was 110 mm.

  Each spring plate 40 is used to press the rubber plate 20 against the tank side plate inner wall surface 200a. Preferably, as shown by a dashed line in FIG. It is preferable to have a partially curved shape.

  The fixing tool 50 for attaching the rubber plate 20 to the weather hood 11, that is, the fixing hole 21 formed in the rubber plate 20 for penetrating the bolt shaft is a length that is elongated in the circumferential direction of the tank side plate of the rubber plate 20. It is a hole. Also, the rubber plate 20 is larger than the bolt shaft in the direction perpendicular to the longitudinal direction, and is provided with a free allowance that can be adjusted in the vertical and horizontal directions when the rubber plate 20 is attached. On the other hand, it should be uniformly attached over the entire circumferential direction.

  In this embodiment, the spring plate 40, the rubber plate 20, the spacer 30, the seal guide support portion 11b1, and the weather hood main body 11a1 are integrally formed with the bolts and nuts that are the fixtures 50 via the round washer 51 in the above configuration. It is fixed. The thickness of the spacer 30 is selected as appropriate, and the tip 20b2 of the rubber plate 20 is adjusted so as to uniformly contact the inner wall surface 200a of the tank side plate 200. The nut is most preferably provided with a mechanism for preventing loosening.

  According to the above configuration, one rubber plate 20 can be installed across two or more weather hoods 11, 11, and rainwater enters from the gap 11 c between the weather hoods 11, 11. Can also be prevented. Therefore, the amount of rainwater intrusion into the tank can be greatly reduced.

  Next, the rubber plate 20 will be described.

(Rubber board)
In the present embodiment, the rubber plate 20 as a plate-like elastic seal member attached to the front end portion of the weather hood 11 is in contact with the tank side plate 200 to prevent the occurrence of sparks when sliding. Conductive rubber is used.

  In this embodiment, each rubber plate 20 arranged in the circumferential direction of the tank side plate 200 is a plate-like rubber plate having a rectangular shape (width W1, length L1). The thickness (T1) and the hardness (H) are adjusted so that a certain degree of deformation can be allowed by movement.

  Further, the upper tip portion 20 b of the rubber plate 20 has a shape such that rainwater transmitted from the tank side plate 200 can be continuously discharged to the outside of the weather hood 11.

This will be described in more detail below.
-Conductivity of rubber plate In the weather seal device 10 of this embodiment, the rubber plate 20 made of conductive rubber, the metal conductive seal guide 11b and the weather hood main body 11a can easily achieve prevention of static electricity. ing.

Therefore, the conductivity of the rubber plate 20 is optimally 1 × 10 ² to 1 × 10 ⁶ Ω · cm in terms of volume resistivity.

  In addition, the rubber material condition for the rubber plate 20 is that it is a conductive rubber and has the rubber hardness described below. However, since it is always installed outdoors, there is a concern about the deterioration of the rubber. The Therefore, high weather resistance is required.

As the conductive rubber, chloroprene rubber, nitrile rubber, ethylene propylene rubber or the like having a volume resistivity within the above predetermined range can be suitably used.
-Thickness and hardness of rubber plate Rubber deformation is likely to occur due to frictional resistance between the tank side plate 200 and the rubber plate 20 when the floating roof rises. When the floating roof descends, there is no problem because the rubber is extended. The higher the rising speed of the floating roof 100, the greater the degree, and the upper tip 20b of the rubber plate 20 crawls toward the tank side plate, that is, a phenomenon that the rubber plate 20 is bent occurs. Overlapping state. As a result, the contact area with respect to the tank side plate 200 increases locally, and further the wrinkle is promoted in the circumferential direction.

  A gap is generated on both sides of the portion where the wrinkles are generated and the thickness is increased, and the sealing performance is greatly reduced.

  Therefore, the thickness and the hardness are adjusted so that such local wrinkles do not occur.

  Strictly speaking, the thickness (T1) of the rubber plate 20 is considered to be determined by the size of the tank 1 and the contact load applied to the side plate 200 by the weather hood 11. Usually, about 8 mm to 15 mm is considered preferable. That is, 8 ≦ T1 ≦ 15. If it is less than 8 mm, there is a problem that the rubber is curved when the floating roof is raised and partial curling is likely to occur, and if it exceeds 15 mm, there is a problem that the weight increases and a change load is applied to the weather hood.

  In the present embodiment, it is exemplified by taking 20,000 KL and 30,000 KL cases floating roof tank as an example, in both cases for not much curvature of the side plate of both the experimental level T1 = It was 10 mm.

The hardness (H) is 50 to 70 (that is, 50 ≦ H ≦ 70), preferably 55 to 60 (55 ≦ H ≦ 60) as a rubber hardness according to a type A durometer method (JIS K6253). If it is much lower than 55, that is, if it is less than 50, it will be too soft and a drooling phenomenon will easily occur. If it exceeds 60, that is, if it exceeds 70, it is too hard and there is no free allowance. If there is any deformation or the like in the rubber, a gap will be formed and the sealing performance will deteriorate.
-Rubber plate shape The rubber plate 20 generally has a width (W1) of 500 mm to 1200 mm and a length (L1) of 120 mm to 200 mm. In this embodiment, the width (W1) is 1040 mm and the length ( L1) was 150 mm. In addition, in the rubber plate 20 having a rubber hardness of 60 and a thickness of 10 mm used by the inventors, which will be described below, in this experiment, the tip portion 20b is sharp (tip thickness (T1a) 1.0 mm or less). When the sloping surface length (L1a) is 16 mm), it has been confirmed that, when the floating roof is raised, a wrinkle with a length of about 3 mm to 10 mm is partially generated.

  Therefore, as shown in FIG. 3 (a), when the tip shape (T1a) is 2 mm and the inclined surface length (L1a) is 16 mm as shown in FIG. It was possible to return to. That is, it has been found that if the tip thickness (T1a) is a certain thickness, in this embodiment, 2 mm or more, a repulsive force effect can be obtained by elastic force. Of course, the inclined surface 20b1 does not have to be linear as shown in FIG. 3 (a), and may be curved (R2) as shown in FIG. 3 (b).

  On the other hand, when the tip thickness (T1a) is too thick, it was found in this experiment that rainwater could not be discharged well if the thickness was 6 mm or more. That is, it is preferable that the tip of the rubber plate 20 has a tip thickness (T1a) of 2 to 5 mm.

  Moreover, it turned out that it is important for the inclined surface part 20b1 of the front-end | tip 20b to start from the position where the length (L1a) from a front-end | tip is 20 mm or less and 10 mm or more. If it exceeds 20 mm, there is a problem that the repulsive force of the rubber is reduced, and if it is less than 10 mm, there is a problem that the restoring force when the rubber is swollen becomes small.

(Spring plate)
As described above, by pressing the rubber plate 20 with a plurality of slightly curved brass plate spring plates 40, the deformed rubber plate 20 is automatically returned to its original state, and the rubber plate tip portion 20b is made uniform. Can be held down. Thereby, the rainwater permeation preventing effect can be maintained and enhanced over a long period of time.

  As shown in FIG. 2, the spring plate 20 has a rectangular shape with a width (W2) and a length (L2). The length (L2) of the spring plate 20 is the rubber plate 20 in this embodiment. The ratio (L1: L2) to the length (L1) is about 1: 0.73.

  In the present embodiment, what is important is the position where the rubber plate 20 is pressed. Preferably, in FIG. 1, the distance (L3) from the tip 20b2 of the rubber plate 20 to the tip of the spring plate 40 is about 15 to 50 mm. If it is shorter than 15 mm and is too close to the rubber plate tip 20b2, the restoring force when the rubber plate 20 is bent will be hindered. Moreover, when it exceeds 50 mm, problems, such as a fall of pressing force, will arise. In this embodiment, the length (L3) from the rubber plate tip 20b2 to the spring plate tip 40a is 40 mm.

  As described above, the spring plate 40 is slightly raised in the vicinity of the center as shown by the alternate long and short dash line in FIG. 1, and preferably about 5 mm in the vicinity of the center.

  Since the leaf spring effect is determined by the rubber contact state (initial setting), it changes depending on the curvature state. Therefore, it is preferable that the brass plate for producing the spring plate 40 can be bent to some extent by human power.

As described above, according to the weather seal device 10 of the present embodiment and the floating roof tank 1 provided with such a weather seal device 10, the following operational effects can be achieved.
(1) A complicated and expensive member for maintaining adhesion to the tank side plate is not required.
(2) Even if there is some distortion in the tank side plate, the tank side plate can be securely adhered to the tank side plate, and a high rainwater infiltration prevention effect can be obtained.
(3) Rainwater entering from a gap between adjacent weather hoods can also be prevented.
(4) Since the intrusion of rainwater can be effectively prevented, the labor and cost for oil-water separation can be reduced, for example, the draining operation in the tank can be reduced.
(5) Since the existing weather hood can be used as it is, attachment is easy and processing can be performed at an arbitrary timing.
(6) By having the above characteristics, it can be applied to a floating roof tank used for a relatively long time.

  In order to demonstrate the operational effects of the weather seal device having the above-described configuration of the present embodiment, a curved steel plate matched to the diameter of the existing floating roof type tank 1 was prepared and viewed on the tank side plate. A weather seal device 10 having materials and dimensions was prepared and installed for experiments. Hereinafter, this experimental example will be described.

The materials and dimensions of each member of the weather seal device 10 used in this experimental example are as follows.
・ Seal guide 11b
Material: Brass Length from the position of the bolt nut 50 to the distal end position of the curved opening (L4): 78 mm
Length from the position of the bolt nut 50 to the center of the radius of the curved portion (L5): 50 mm
Length from the position of the bolt nut 50 to the lower end position (L6): 20 mm
Radius R1: 28mm of the curved part 11b2
・ Rubber plate 20
Material:
Overall shape: Width (W1) 1040mm
Length (L1) 150mm
Thickness (T1) 10mm
Length from the position of the bolt nut 50 to the upper tip position (L1-L6): 130 mm
Distance from the position of the bolt nut 50 to the lower end position (L6): 20 mm
Tip shape: Tip thickness (T1a) 2 mm
Slope length (L1a) 16mm
・ Spacer 30
Material: SUS
Overall shape: Width (W30) 400mm
Length (L30) 38mm
Thickness (T3) 6mm
・ Spring plate 40
Material: Brass Overall shape: Width (W2) 50mm
Length (L2) 110mm
Thickness (T4) 1.0mm
Length from the position of the bolt nut 50 to the upper tip position (L2-L6): 90 mm
Distance from the position of the bolt nut 50 to the lower end position (L6): 20 mm

Experimental Example Using the weather seal device 10 having the above-described configuration, water was allowed to flow from the upper part of the tank side plate to the tank side plate 200, and the leakage amount to the inside of the tank and the discharge amount to the outside were measured. The measurement was measured as the amount per minute.

  Experiment 1: When the seal guide is in a position in contact with the weld line in the lateral direction of the tank side plate 200.

  Experiment 2: When the seal guide is in a position in contact with only the longitudinal weld line of the tank side plate 200.

  The results are shown in Tables 1 and 2.

  As understood from the above experimental results, good results could be obtained by adopting the configuration according to the present invention.

DESCRIPTION OF SYMBOLS 1 Floating roof type tank 10 Weather seal apparatus 11 Weather hood 11a Weather hood main body 11b Seal guide 50 Bolt nut (fixing tool)
20 Rubber plate (elastic seal member)
30 liner (spacer)
40 Spring plate 100 Floating roof 101 Pontoon 103 Pontoon outer peripheral side wall (floating roof outer peripheral part)
104 Roof plate 105 Mounting base 107 Hinge member 200 Tank side plate

Claims (6)

A weather hood disposed in the circumferential direction of the tank side plate that shields the gap between the tank side plate of the floating roof type tank and the outer peripheral side wall of the pontoon constituting the outer peripheral portion of the floating roof,
The weather hood has a weather hood body and a conductive seal guide attached to the upper end of the weather hood body,
The seal guide is in elastic contact with the tank side plate, and the lower end of the weather hood body is a weather seal device attached to a floating roof,
A plate-like elastic seal member having a predetermined thickness and disposed on the outer surface of the seal guide;
A spring plate disposed on the outer surface of the elastic seal member;
The spring plate and the elastic seal member are attached to the weather hood by a fixture, the tip of the elastic seal member is urged toward the tank side plate by the spring plate, and is brought into contact with the weather hood .
The conductive seal guide is a flat plate-like support portion attached to the weather hood main body, and extends from the support portion toward the tank side plate and protrudes toward the tank side plate. A substantially semicircular curved portion, wherein the curved portion is in contact with an inner wall surface of the tank side plate, the curved portion opening is opened toward the elastic seal member, and the support portion is located above the weather hood main body. Attached to the end,
The elastic seal member has a lower end attached to the support portion of the seal guide with a spacer interposed therebetween, and the elastic seal member closes the opening of the seal guide so as to close the tank side plate. A weather sealing device for a floating roof type tank, characterized in that the upper end of the elastic seal member is in contact with the inner wall surface of the tank side plate . The elastic seal member has a thickness of 8 mm to 15 mm, a hardness of 50 to 70 in terms of type A durometer rubber hardness, and a conductivity of 1 × 10 ² to 1 × 10 ^{6 in} terms of volume resistivity. The weather sealing device for a floating roof type tank according to claim 1, wherein the resistance is Ω · cm. The elastic sealing member, the upper region of the elastic sealing member abutting an inner wall surface of the tank side plate, according to claim 1 or 2, characterized in that the thickness is inclined to gradually become smaller toward the distal end A weather seal device for a floating roof tank according to claim 1. 4. The floating roof type according to claim 3 , wherein the tip of the elastic seal member has a tip thickness of 2 mm to 5 mm, and the inclined surface portion of the tip starts from a position of 20 mm or less and 10 mm or more from the tip. Tank weather seal device. The elastic seal members are attached in close contact with each other in the circumferential direction along the inner wall surface of the tank side plate, and the elastic seal members have both side edges in the circumferential direction of the tank side plate. The weather seal device for a floating roof tank according to any one of claims 1 to 4 , wherein the weather seal device is disposed so as to cover a seam of the weather hood that is closely attached. In the floating roof type tank having a weather seal device including a weather hood that shields a gap between the tank side plate and the outer peripheral side wall of the pontoon constituting the outer peripheral portion of the floating roof,
The weather-sealing device is the weather-sealing device according to any one of claims 1 to 5 , and is a floating roof type tank.

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