JPH0655632B2 - Diaphragm tank - Google Patents

Description

TECHNICAL FIELD The present invention relates to a diaphragm tank in which the inside of a fixed roof tank is partitioned by a separable diaphragm so that a plurality of types of fluid can be stored separately. Is.

[Prior Art] For example, in the storage of crude oil, it is a general mode to use various tanks installed for different types of oil such as gasoline, kerosene, and heavy oil. The capacity of these various tanks is
Since it is determined based on the required capacity at the peak of seasonal demand for various oils, the operating rate throughout the year is estimated to be about 6
It is as small as 0%. In order to effectively use the oil storage capacity of various tanks, improve the operating rate of the tanks, and improve economic efficiency, avoid storing oil that is in low demand in small quantities dispersed in many tanks. It is preferable to store as much as possible. Then, at that time, the storage capacity may be divided into the types of oil that are in high demand. Specifically, the types of oil that are in low demand are collectively stored in the minimum required number of tanks, and some tanks of the type of oil that have sufficient oil storage capacity are opened to store different types of oil that are in high demand. It may be stored, but due to the difficulty of cleaning the tank and the uncertainty of the demand forecast for each oil type,
Actually, it was difficult to perform the above operation.

Therefore, in order to effectively utilize the oil storage capacity of the tank, a tank capable of separately storing two or more types of oil has been proposed. For example, FIG.
-A cross-sectional view of the tank shown in No. 9393, which is intended to store two liquids simultaneously.

A disk-shaped floating lid 2 is provided inside the fixed roof tank 1, and the floating lid 2 receives the liquid 4 stored in a storage chamber 3 in the tank 1 and A bag-shaped flexible diaphragm 5 is attached to the lower surface. That is, the upper end of the opening of the diaphragm 5 is fixed to the outer peripheral portion of the lower surface of the floating lid 2 via a sealing material (not shown), and another storage chamber 6 isolated from the storage chamber 3 storing the liquid 4 is provided. Composed of different kinds of liquid 7
Can be stored.

[Problems to be Solved by the Invention] In the tank having the above-described structure, five types of liquids 4 and 7 are in contact with each other from the opposite sides to the attachment portions of the upper opening of the diaphragm 5 and the lower surface of the floating lid 2. Therefore, a sufficient fluid sealing property is required for the portion. However, generally, the tank 1 and the floating lid 2 are made of steel, and the flexible diaphragm 5 is made of oil resistant rubber or the like. Therefore, there is a problem in that it is difficult to give sufficient sealing performance to the attachment portion of the diaphragm 5 and the floating lid 2 because the materials of the both are different.

Further, the diaphragm 5 that divides the upper storage chamber 6 is the tank 1
It is configured to hang down from the peripheral wall 8 and into the lower storage chamber 3. Therefore, when the lower storage chamber 3 is emptied and a large amount of liquid is put only in the upper storage chamber 6, the diaphragm 5 is supported only by the tank bottom plate and cannot be supported by the peripheral wall 8. There was a problem that could be destroyed. Therefore, it was necessary to avoid putting the liquid only in the upper storage chamber 6.

An object of the invention is a diaphragm tank in which the inside of a fixed roof tank is divided into two storage chambers by a flexible diaphragm, and each storage chamber can store a fluid having a larger specific gravity than the other. It is an object of the present invention to provide a diaphragm-type tank that can store fluid only in one of the storage chambers, has a good sealing property between the storage chambers, and is easy to construct.

[Means for Solving Problems] A diaphragm tank of the present invention is a diaphragm tank for partitioning a fixed roof tank by a flexible diaphragm to separate and store a liquid. A side wall having a shape along the inner surface of the peripheral wall, and an opening upper end fixed to the inner surface above the peripheral wall, which divides the storage space in the tank into two, and a plurality of through holes are formed in the pipe wall. It consists of a tube elongated in the vertical direction, the lower end of the tube is connected and fixed to the central liquid inlet / outlet tube, and the bottom of the diaphragm is liquid-tightly fixed to the outer periphery of the tube or the central liquid inlet / outlet tube. A first fluid that is erected in the storage space inside the spacing membrane in a state where the upper part of the storage tank is fixed inside the tank, and that communicates between the storage chambers inside the diaphragm to the outside of the tank via the central liquid inlet / outlet pipe. A guideway and a plurality of through holes on the pipe wall A tubular body that is fixed along the inner surface of the peripheral wall of the tank, the upper end of which is located slightly below the upper end of the diaphragm, and the lower end of which is at least slightly below the lower end of the side peripheral portion of the diaphragm. And a second fluid guide path that communicates a space located between the inner surface of the tank peripheral wall and the diaphragm.

[Operation] The upper end of the diaphragm opening is fixed to the inner surface above the peripheral wall of the tank. Since the fluid to be stored does not reach the attachment part, the attachment part is not required to have a high degree of sealing. Therefore, the attachment work of the diaphragm can be easily performed.

When a fluid with a large specific gravity is put in the storage space (inner space) inside the diaphragm and a fluid with a small specific gravity is put in the storage space (outer space) between the diaphragm and the peripheral wall, the diaphragm is the self-weight of the fluid with a large specific gravity. It becomes a swollen shape. However, since the side peripheral portion of the diaphragm has a shape along the inner surface of the peripheral wall and the diaphragm contacts the inner surface of the peripheral wall at the side peripheral portion, the self-weight of the fluid having a large specific gravity is surely supported by the diaphragm and the peripheral wall. To be Therefore, the diaphragm is not damaged.

Further, in the above-mentioned state, the outer space is divided into upper and lower parts with the contact portion between the diaphragm and the peripheral wall as a boundary. However, since the second fluid guide passage connects the upper and lower spaces, The fluid can be withdrawn without hindrance.

Next, when the fluid is put only in the inner space and the outer space is emptied, the weight of the fluid in the diaphragm is the same as in the above case, the weight of the fluid in the diaphragm and the peripheral wall of the tank in contact with the diaphragm. Supported by. Therefore, the diaphragm is not damaged.

Next, when a fluid having a low specific gravity is put in the inner space and a fluid having a high specific gravity is put in the outer space, the bottom of the diaphragm is crushed by the weight of the fluid on the outer side. However, since the space in the diaphragm communicates with the outside by the first fluid guide path provided upright in the space, the passage of the inner fluid is secured and the fluid can be freely taken in and out. it can.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS.

In the figure, 10 is a dome roof tank as a fixed roof tank. The dome roof tank 10 has a cylindrical peripheral wall 12 fixed on a bottom plate 11, and an upper end of the peripheral wall 12 is fixed with a dish-shaped roof 13 convex upward. . The dome roof tank 10 is used to store oils, and a liquid inlet / outlet pipe 14 is provided at the bottom of the peripheral wall 12.

A diaphragm 15 made of a flexible material such as oil resistant rubber is provided inside the dome roof tank 10. Diaphragm 1
The original shape of 5 is a substantially circular shape having an open upper end, and its side peripheral portion 15 a has a shape along the inner surface of the peripheral wall 12.
The peripheral edge of the opening upper end 15b of the diaphragm 15 is fixed to the inner surface above the peripheral wall 12, and the storage space in the dome roof tank 10 is divided into two spaces S1 and S2 inside and outside through the diaphragm 15. It is divided.

A first fluid guide passage 16 is provided upright in a substantially central portion of the bottom portion 15c of the diaphragm 15, and the fluid guide passage 16 communicates with a central liquid inlet / outlet pipe 17. Central liquid inlet / outlet pipe 17 and diaphragm 1
For example, as shown in FIG. 5, it is preferable that the mounting portion of the diaphragm 5c has a structure in which the end portion of the diaphragm 15c having the ring-shaped core member 18 wrapped therein is bolted. And the first
The fluid guide passage 16 is vertically provided in the space S1 in the diaphragm 15 with respect to the bottom plate 11, and its upper end reaches the height of the attachment portion of the diaphragm 15 or more and is fixed to the central manhole of the roof 13. This is preferable because it can be easily and surely fixed. A large number of through holes are provided on the peripheral surface of the first fluid guide furnace 16 so that the oil stored in the space S1 can be introduced into the guide passage. On the other hand, the central liquid inlet / outlet pipe 17 has a bottom portion 15c of the diaphragm 15.
It is bent at a lower position of, and penetrates the peripheral wall 12 of the tank 10 to be guided to the outside.

Next, on the inner surface of the peripheral wall 12, a plurality of liquid drain pipes 19 which are second fluid guide passages are provided so as to be perpendicular to the bottom plate 11. As shown in FIG. 6, the drain pipe 19 is a pipe having a semicircular cross section, and its length is set to reach the vicinity of the fixed portion of the upper end 15b of the diaphragm 15. Both upper and lower ends of the liquid drain pipe 19 are open, and a large number of through holes 19a for liquid drop are formed around the pipe. In addition, the liquid drain pipe 1
In order to prevent the diaphragm 15 from coming into contact with the upper end of the diaphragm 9 and damaging it, it is preferable to smoothly cut it off obliquely.

It should be noted that if a pedestal 20 having porosity is provided at the bottom of the tank 10 so that the bottom 15c of the diaphragm 15 can be separated from the bottom plate 11 to indicate the outside, even when a liquid having a large specific gravity is put in the internal space S1 of the diaphragm 15, It is preferable because the liquid in the space S2 can be easily extracted.

Next, the operation of the above configuration will be described.

The peripheral edge of the opening upper end 15b of the diaphragm 15 is fixed to the inner surface above the peripheral wall 12. Since the oil to be stored generally does not reach the attachment part, the attachment part is not required to have a high degree of sealing property. Therefore, the diaphragm 1
The mounting work of 5 can be easily performed.

When hot water is poured only into the space S1 inside the diaphragm 15, as shown in FIG. 1, the diaphragm 15 swells and is reliably supported by the peripheral wall 12 and the lower plate 11 (or the pedestal 20).

Further, when the oil is put only in the space S2 outside the diaphragm 15, the diaphragm 15 is connected to the first fluid guide passage 1 as shown in FIG.
Shrinks around 6 while being crushed.

On the other hand, the hot water L1 having a large specific gravity is put in the space S1 inside the diaphragm 15, and the oil L2 having a small specific gravity is put in the space S2 outside the diaphragm 15.
When the oil is added, as shown in FIG. 3, the diaphragm 15 is swollen by the own weight of the oil L1 having a large specific gravity. However, the shape of the diaphragm 15 is a cylindrical shape with an upper opening that is substantially the same as the size of the dome roof tank 10, and the side peripheral portion 15 a of the diaphragm 15 is formed along the inner surface of the peripheral wall 12. Therefore, since the diaphragm 15 contacts the inner surface of the peripheral wall 12 at the side peripheral portion 15a, the self-weight of the oil L1 having a large specific gravity is
It is reliably supported by the peripheral wall 12 and the bottom plate 11 (or the pedestal 20) via the. Therefore, the diaphragm 15 is not damaged.

Further, in the above-mentioned state, the outer space S2 has the diaphragm 1.
It is divided into upper and lower parts at the contact portion between the peripheral wall 12 and the peripheral wall 5. However, since a plurality of drain pipes 19 connect the upper and lower spaces to each other, the oil L2 in the upper space can enter the pipe through the through hole 19a and flow down into the lower space, The oil L2 in the space S2 can be extracted from the liquid inlet / outlet pipe 14 to the outside without any trouble.

Next, as shown in FIG. 4, oil L2 having a small specific gravity is put in the inner space S1, and oil L having a large specific gravity is put in the outer space S2.
When 1 is added, the bottom portion 15c of the diaphragm 15 is crushed by the weight of the oil L1 on the outside. However, the diaphragm 15
Which is erected in the space S1 by penetrating the bottom portion 15c of the
Since the space S1 in the diaphragm 15 communicates with the outside by the fluid guide passage 16 of, the passage of the oil L2 on the inside is secured. Therefore, the oil L2 stored in the inner space S1 can be freely taken in and out.

[Effects of the Invention] As described above, according to the diaphragm tank of the present invention,
The upper end of the opening of the diaphragm is fixed to the inner surface above the peripheral wall of the tank, and since the fluid to be stored does not reach the attachment portion, the attachment portion is not required to have a high degree of sealing property. Therefore, the attachment work of the diaphragm can be easily performed.

Further, when a fluid having a large specific gravity is put in the storage space (inner space) inside the diaphragm and a fluid having a small specific gravity is put between the storage chambers (outer space) between the diaphragm and the peripheral wall, the diaphragm has a large specific gravity. Although the bulging shape is caused by the fluid's own weight, the side peripheral portion of the diaphragm contacts the inner surface of the peripheral wall, so that the own weight of the fluid having a large specific gravity is reliably supported by the diaphragm and the peripheral wall, and the diaphragm is not damaged.

Further, in the above-mentioned state, the outer space is divided into upper and lower parts with the contact portion between the diaphragm and the peripheral wall as a boundary, but since the second fluid guide path connects the upper and lower spaces,
The fluid in the outer space can be extracted without any trouble.

Next, when a fluid having a small specific gravity is put in the inner space and a fluid having a large specific gravity is put in the outer space, the bottom of the diaphragm is crushed by the weight of the fluid outside, but the space in the diaphragm is Since the first fluid guide furnace erected in the space communicates with the outside, the passage of the inner fluid is secured and the fluid can be freely taken in and out. Further, in this case, since the diaphragm is brought into contact with and supported by the outer periphery of the pipe body forming the first fluid guide path, the diaphragm is not damaged.

As described above, according to the present invention, there is an effect that the range of use of the diaphragm tank can be expanded and the safety can be improved.

[Brief description of drawings]

1 to 4 are cross-sectional views showing an embodiment of the present invention. FIG. 1 shows the case where liquid is put only in the inner space, and FIG. 3 shows a case where a liquid having a large specific gravity is put in the inner space, FIG. 4 shows a case where a liquid having a large specific gravity is put in the outer space, and FIG. 5 shows a central liquid inlet / outlet pipe and a diaphragm. FIG. 6 is a cross-sectional view showing an example of a mounting structure, FIG. 6 is a perspective view showing a peripheral wall of a tank and a drain pipe cut along a horizontal plane in an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing an example of a conventional diaphragm tank. It is a figure. 10 ... Dome roof tank as fixed roof tank, 12 ... Peripheral wall, 15 ... Diaphragm, 15a ... Side circumference of diaphragm, 15b ... Upper end of diaphragm opening, 15c ... Bottom of diaphragm, 16 First fluid guide passage, 17 ... Central liquid inlet / outlet pipe, 19 ... Liquid drain pipe as second fluid guide passage, S1
...... Inside space as storage space, S2 ...... Outside space as storage space, L1 ... Oil with a large specific gravity as a fluid, L2 ... Oil with a small specific gravity as a fluid.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanobu Kimura, 2-chome, Shio-dori, Kurashiki-shi, Okayama Japan Mining Co., Ltd. Mizushima Refinery (72) Inventor, Norio Sasaki 2-chome, Shio-dori, Kurashiki-shi, Okayama Japan Mining Mizushima Refinery Co., Ltd. (72) Inventor Tomoyoshi Harada, 2-chome Shiodori, Kurashiki-shi, Okayama Japan Mining Co., Ltd. Mizushima Refinery (72) Inventor Tsutomu Shimizu 4-3-20 Toranomon, Minato-ku, Tokyo Koyo Construction Kogyo Construction Industry Co., Ltd. (72) Inventor Sojiji Terada 4-3-20 Toranomon, Minato-ku, Tokyo Koyo Construction Co., Ltd. (56) Reference JP-A-50-115317 (JP, A)

Claims (2)

[Claims] 1. A diaphragm type tank for separating and storing a liquid by partitioning the interior of a fixed roof type tank with a flexible diaphragm, wherein the fixed roof type tank has a side peripheral portion having a shape along an inner surface of a peripheral wall of the fixed roof type tank. At the same time, the upper end of the opening is fixed to the inner surface above the peripheral wall and divides the storage space in the same tank into two parts, and a vertically long tubular body having a plurality of through holes formed in the tubular wall. The lower end is connected and fixed to the central liquid inlet / outlet pipe, the bottom of the diaphragm is liquid-tightly fixed to the outer periphery of the pipe or the central liquid inlet / outlet pipe, and the upper part of the pipe is fixed inside the tank. A first fluid guide passage that is erected in a storage space inside the diaphragm and connects the storage chambers inside the diaphragm to the outside of the tank via the central liquid inlet / outlet pipe, and a plurality of through holes are formed in the pipe wall. It consists of a tube that is long in the vertical direction and extends along the inner surface of the peripheral wall of the tank. A space between the inner surface of the tank peripheral wall and the diaphragm, the upper end of which is located slightly below the upper end of the diaphragm and the lower end of which is located slightly below the lower end of the side peripheral portion of the diaphragm. And a second fluid guide path that communicates with the diaphragm tank. 2. The diaphragm tank according to claim 1, wherein the second fluid guide path is composed of a half-split tube body whose opening side of the split surface is fixed to the inner surface of the tank peripheral wall. .