JPH0595894U - Floating roof type vertical storage tank weather hood device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] By almost eliminating the gap between the weather hood device and the side plate of the floating roof tank, rainwater is prevented from entering the tank as much as possible, and the draining work is reduced and the tank is reduced. Measures to reduce the corrosion of the bottom plate. [Structure] By dividing the function of the conventional seal head 7 into two parts, the slide piece 8 (new part) and the seal head 7, the seal head 7 can be closely attached to the side plate,
The material and shape are such that the wrap with the adjacent seal head 7 is good. Further, by bending the lap portion of the weather hood 1 to form a gutter, the seal head 7 has a good lap property and rainwater is prevented from entering from the lap portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a floating roof type vertical cylindrical storage tank for storing dangerous substances such as crude oil and gasoline.

[0002]

[Prior Art]

 The floating roof is a roof that floats on the liquid in the storage tank and moves up and down according to the liquid level. A rubber seal is installed in the gap between the side plate of the storage tank and the floating roof to prevent evaporation of liquid, and a weather hood device on the upper part (1) blocks direct sunlight to prevent deterioration of the rubber seal. , (2) Prevent the entry of flying fallen objects and prevent the rubber seal from being damaged, and (3) Install the rubber seal to cover the rubber seal for the purpose of reducing the amount of rainwater entering the storage tank.

Although the conventional weather hood device has a temporary effect of reducing the amount of rainwater intrusion, it has the following drawbacks when the main purpose is to prevent rainwater intrusion. 1) Since the seal head needs to bear the weight of the weather hood and external forces such as wind and snow, and requires smooth sliding, it has a comparative rigidity of a circular plate with a thickness of 1 to 2 mm. Since high parts are used, they do not flexibly follow the curvature of the storage tank side plate, and the thickness of the weather hood at the lap portion also affects, resulting in a large gap with the storage tank side plate. 2) The size of the semi-circular portion of the seal head is also large, and it is not possible to prevent rainwater from flowing down along the side plate due to the synergistic effect with the large gap described above. 3) Rainwater also enters from the wraps of the weather hoods. 4) In some cases, rubber is used for the seal head, but it is exposed to direct sunlight and deteriorates quickly.

An example of conventional technology will be described below with reference to the accompanying drawings. FIG. 7 shows a side view of the weather hood device, and FIG. 8 shows a front view of three sets of weather hood devices. The width a of the weather hood and the seal head is about 500 mm, and they are arranged on the floating roof 11 over the entire circumference. Lap margin b is about 30 mm.

In the lap portion of FIG. 9, as a result of the weather hood being interposed between the seal head and the adjacent seal head, a gap f is generated and the gap e becomes large as shown in FIG. Looking at this state from above is as shown in FIG.

Further, when a height mismatch g between the weather hood device and the adjacent weather hood device occurs due to manufacturing error / installation error, as shown in FIG. It will be large.

Further, since the size of the semi-arcuate portion of the seal head is large, the size d becomes large as shown in FIG. 10, and rainwater is easily collected in the semi-arcuate portion as if rainwater is collected in a bottle by a funnel. , It is not possible to prevent rainwater from flowing down along the side plates.

Rain on the surface of the seal head easily penetrates into the storage tank through the gap between the wraps as shown by the broken line in FIG. Most of the rainfall on the surface of the weather hood flows down on the floating roof, but part of it flows laterally and enters the storage tank through the gap of the lap portion like the seal head.

[0009]

[Problems to be solved by the device]

 In the floating roof type vertical cylindrical storage tank, the rain on the floating roof is automatically drained to the outside of the storage tank by the drainage device, but the rainwater on the rubber seal enters the storage tank due to the slight gap between the seal and the side plate of the storage tank. invade. If left unattended, this invading rainwater causes an accident such as a lateral overflow of the stored liquid, and causes corrosion of the bottom plate of the storage tank. Therefore, it is appropriately drained from the drainage port at the bottom of the side plate. It is important to reduce the amount of rainwater intrusion because it is necessary to frequently perform this draining work, and because the stored liquid is mixed into this drainage, it cannot be discharged as it is, and oil and water separation work is required. The present invention provides a weather hood device that can significantly reduce the amount of rainwater entering the storage tank.

[0010]

[Means for Solving the Problems]

 In the present invention, a weather hood 1 is tiltably disposed on the upper surface of a floating roof of a vertical roof type cylindrical storage tank, and a seal head 16 made of a flexible metal material is disposed on the upper end of the weather hood 1. A slide piece 8 is arranged at the lower end of the seal head and at the upper end of the weather hood 1, and a gutter 13 extending to the lower part of the adjacent weather hood 1 is formed at one end 15 of the weather hood 1. It is a weather hood device for a floating roof type vertical cylindrical storage tank.

[0011]

[Action]

 According to this structure, most of the rainwater flowing down along the side plate is floated to the floating roof side by the synergistic effect of the extremely small gap between the seal head and the storage tank side plate and the small bending of the seal head tip. It is also possible to guide the rainwater to the floating roof side by using the gutter provided in the weather hood, while the rainwater that had conventionally bypassed the weather hood wrap and entered the storage tank. Rainwater intrusion into the storage tank will be greatly reduced.

[0012]

【Example】

 Since the rubber seal does not have a rainwater intrusion prevention function, the objective can be achieved by strengthening the rainwater intrusion reduction function of the weather hood device above it. For that purpose, the function of the conventional seal head 7 is divided into two parts, the slide piece 8 and the seal head 16. The slide piece 8 bears the weight of the weather hood 1 and external forces such as wind and snow, and in order to make it slide smoothly, bend a slightly thick copper alloy in an arc shape and attach it to the upper end of the weather hood 1 at two locations (seal). Since it is arranged under the head 16, it does not need to be provided over the entire width of the weather hood 1.).

The seal head 16 uses a thin plate made of copper alloy for the spring so that the seal head 16 flexibly follows and adheres to the curvature of the storage tank side plate and can follow the angular displacement of the weather hood 1 by the spring effect. Attach to the tip of the weather hood 1 over the entire width of the weather hood 1. The shape is bent so as to exert a spring effect, and the tip is inclined and bent so that the wrap property with the adjacent seal head 8 is best.

One side of the weather hood 1 is bent to form a gutter, and this gutter is arranged on the back side (storage tank side plate side) of the adjacent weather hood to be wrapped. As a result, the overlapping steps of the weather hoods are eliminated, and the seal heads 17 are wrapped well.

FIG. 1 shows a side view of a weather hood device of the present invention, and FIG. 2 shows a front view of three sets of weather hood devices. The width a of the weather hood is about 500 mm and is arranged on the floating roof 11 all around. Lap margin b is about 30 mm.

FIG. 3 is a detailed sectional view taken along line A-A in FIG. 2, FIG. 4 is a detailed sectional view taken along line B-B in FIG. 2, FIG. 5 is detailed sectional view taken along line C-C in FIG. 2, and FIG. The detailed drawing of a part is shown. The space c between the storage tank side plate 10 and the floating roof 11 (see FIG. 1) is not constant over the entire circumference in terms of manufacturing accuracy, and also changes as the floating roof rises and falls. The weather hood device rotates about the hinge pin 6 as a fulcrum to follow this change, and the inclination angle θ changes.

The seal head 16 flexibly follows and adheres to the curvature of the storage tank side plate 10 and can follow the angular displacement of the weather hood by the spring effect, and is flexible with a metal material from the viewpoint of durability. It is preferable to use a copper alloy thin plate (thickness: about 0.3 mm) for springs.

In FIG. 3, the seal head 16 is elastically deformed from the free shape shown by the broken line to the shape shown by the solid line to secure the adhesion force. Bending of the tip of the seal head 16 is effective for ensuring smooth sliding, but is set to a minimum bending length so as not to impair flexibility and to collect rainwater as much as possible ( The rainwater collection width d of FIG. 6 is much smaller than that of the conventional technique (FIG. 10).

Further, the tip of the seal head is provided with a slope as shown in FIG. 2, and even if some manufacturing error or installation error occurs, the wrap does not ride on the bent part of the seal head tip of the other side, The gap with the storage tank side plate does not become large (the gap e at the lap end in FIG. 6 corresponds to e in the prior art (FIGS. 10 and 11)).

The width of the slide piece 8 is about 20 mm, and it is attached to the upper ends of the reinforcing angles 2 (two places) (see FIGS. 3 and 4). The weather hood device always contacts the side plate with two slide pieces, and bears the weight of the weather hood and external forces such as wind and snow.

In order to minimize the gap e between the storage tank side plate and the seal head tip at the wrap end, further consideration is to eliminate the overlapping step of the weather hood so that the seal heads directly contact each other, This is solved by providing a gutter 13 on one side of the weather hood as shown in FIG. In addition, this gutter also has the function of collecting rainwater that bypasses the lap and invades it, and guides it to the floating roof side.

In addition to the conventional function of fixing the seal head, the holding plate 4 also has the function of the floating prevention plate 14 (FIG. 8). FIG. 9 shows a conventional technique of the wrap portion corresponding to FIG. As a result of the weather hood being interposed between the overlapping seal heads, a gap f is created and the gap e becomes large as shown in FIG. Further, when a height mismatch occurs due to a manufacturing error or an installation error, it is greatly improved that the clearance e becomes larger (see FIG. 11) by riding on the other side of the seal head.

[0023]

[Effect of the device]

 According to the present invention, the amount of rainwater entering the storage tank can be greatly reduced, the draining work from the storage tank and the wastewater treatment work thereof can be significantly reduced, and the corrosive environment of the bottom plate can be mitigated.

[Brief description of drawings]

FIG. 1 is a side view of a weather hood device of the present invention.

FIG. 2 is a front view of three sets of weather hood devices.

FIG. 3 is a sectional view taken along line AA of FIG.

4 is a sectional view taken along line BB of FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a detailed view of a wrap portion at the tip of the seal head.

FIG. 7 is a side view of a prior art weather hood device.

FIG. 8 is a front view of three sets of conventional weather hood devices.

9 is a sectional view taken along line D-D in FIG. 8.

10 is a sectional view taken along line EE of FIG.

FIG. 11 is an explanatory diagram when a height mismatch occurs in FIG. 10;

12 is a sectional view taken along line F-F in FIG.

13 is a sectional view taken along line GG of FIG.

[Explanation of symbols]

 1 Weather Hood 2 Reinforcement Angle 3 Mounting Angle 4 Holding Plate 5 Mounting Base 6 Hinge Pin 7 Seal Head 8 Slide Piece 9 Ground Wire 10 Storage Tank Side Plate 11 Floating Roof 12 Rubber Floating Roof Seal 13 Gutter 14 Formed on Weather Hood 14 Floating Prevention Plate 15 One end of weather hood 16 Seal head made of metal material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiharu Nakano 46-59 Nakahara, Tobata-ku, Kitakyushu City Nippon Steel Plant Design Co., Ltd. (72) Nobuhiro Nakanishi 46-59 Nakahara, Tobata-ku, Kitakyushu City Made in Japan (72) Inventor Tadahisa Furuichi 46-59 Nakahara, Tobata-ku, Kitakyushu City Nippon Steel Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A weather hood 1 is tiltably disposed on an upper surface of a floating roof of a vertical roof type cylindrical storage tank, and a seal head 16 made of a flexible metal material is disposed on an upper end of the weather hood 1. Then, the slide piece 8 is arranged on the upper end of the weather hood 1 at the lower end of the seal head, and the one side end portion 15 of the weather hood 1 is provided with the gutter 13 extending to the lower part of the adjacent weather hood 1. A floating hood type vertical hood type vertical storage tank weather hood device.