JPS6315185Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an underground tank for storing petroleum.

Underground tanks for petroleum storage are a type of tank that has recently been widely adopted due to the difficulty in location and the safety of petroleum stockpiling.

Figure 1 shows an example of a typical underground tank for petroleum storage that has been proposed in the past.
A cylindrical concrete tank 1 is installed underground, and the inside is liquid-tightly lined with a sealing steel plate 6. A cylindrical chamber 7 is separately installed in the ground outside the concrete tank, and inside A pump 8 for receiving and discharging petroleum is installed, and the ground and inside of the tank are communicated via piping 10 via the pump 8.
indicates a floating roof that prevents evaporation of the tank contents 2.

FIG. 1B is for use in areas with heavy snowfall or heavy rain; a fixed roof 4 is provided, the pump is a submersible pump 9, and the pump is connected to the ground via piping 10;
Note that a ventilation chamber 5 is provided on the fixed roof 4 in order to reduce the gas concentration between the floating roof 3 and the fixed roof 4.

Further, C in FIG. 1 shows a piping tunnel 14 installed so as to reach the bottom of the tank, so that the pump 8 can receive and discharge petroleum through the piping 10.

In the above example, if there is only floating roof 3 as in A, there is a concern that when rainwater accumulates on the floating roof, it will be difficult to drain the rainwater properly, and when it is exposed to direct sunlight, the seal will be damaged. Since the steel plate 6 tends to become uneven due to buckling due to thermal stress, it is considered to install a fixed roof 4 as shown in B, but if the roof is supported without using supports, it will become a dome-shaped roof. ,
Moreover, the curvature of the dome is large enough to become a large tank.
In other words, a roof with a high height is required, and especially in areas with heavy snowfall, large parts are required and become expensive. Therefore, as shown in C, it may be possible to support the roof 4' with a number of pillars 11 installed inside the tank, but although this has the effect of lowering the height of the roof 4', it is As the number of columns 11 increases, there are still problems with the smooth operation of the floating roof, the safety of the columns, etc. due to misalignment of the columns 11 due to the movement of the liquid in the tank due to earthquakes, and there are disadvantages such as difficulty in removing sludge. As for pumps, submersible pumps like B do not have a large capacity, so if you have a large tank, you will need several units, which causes problems in maintenance and inspection. However, if the underground tank becomes large and a deep chamber 7 has to be created, there are problems with excavation, and the pump installed in the chamber 7 and the bottom of the tank It is also difficult to install the connecting pipes, and even if you try to open the room 7 horizontally and install the tunnel 14 for the pipes as shown in C, it will not be possible to install it unless you are in a place like a legal land, for example. The drawback was that it was subject to topographical constraints.

On the other hand, when it comes to large-capacity tanks, measures to prevent sludge from accumulating on the bottom of the tank become a problem, and there is also the problem that if the prevention device is installed only by erecting a support from the tank, it becomes even more difficult to remove the sludge. Ta. The purpose of this invention is to provide an underground tank for storing petroleum products which can solve the above-mentioned problems regarding construction of a fixed roof, problems regarding pump installation, and problems regarding prevention of sludge accumulation.

The gist of the present invention is that a vertical hollow chamber d is erected in the center of an underground tank for storing petroleum, the top e of the hollow chamber d is a support part of the fixed roof f of the tank, and the hollow chamber d is The hollow chamber d also serves as a pump room for receiving and discharging petroleum stored in the tank.
A liquid circulation pump p is installed, a suction pipe q is opened to protrude into the tank from below the cylindrical body b, which is the outer wall of the hollow chamber, and this opening is communicated with the suction side of the pump p, and the cylindrical body An arcuate tube r is disposed on the lower outer periphery of the cylindrical body b, with a support u protruding from the outer wall of the cylindrical body b, a part of the arcuate tube r is communicated with the discharge side of the pump p, and the circular An underground tank for storing petroleum products, characterized in that a branch pipe s extends radially from the arcuate pipe r around the center of the hollow chamber d, and a nozzle t is provided at the end of the branch pipe s or in the middle thereof. It is in.

The structure of the underground tank for storing petroleum products according to the invention will be described in detail based on an embodiment shown in FIG. A tank capable of storing petroleum by erecting a cylindrical body b made of concrete in the center thereof, and lining the inner wall of the concrete tank, the upper surface of the bottom, and the outer periphery of the cylindrical body b with a sealing steel plate C in a liquid-tight manner. A, the cylindrical body b
The inside of is a vertical hollow chamber d, and the concrete tank is
A fixed roof f is installed over the upper edge ba' of ba and the top e of the cylindrical body b, the top e of the vertical hollow chamber d serves as a support for the fixed roof f, and the bottom of the hollow chamber d is Third
As shown in the enlarged figure, a pump g for receiving and discharging petroleum stored in the tank is installed, and a separate pump g for liquid circulation is installed in the hollow chamber d, as shown in FIGS. 5 and 6. A pump p is installed, a suction pipe q is opened to protrude into the tank from below the cylindrical body b, which is the outer wall of the hollow chamber, and this opening is communicated with the suction side of the pump p. Arc-shaped tube r on the lower outer periphery
is disposed with a support U protruding from the outer wall of the cylindrical body b, a part of the arcuate pipe r is communicated with the discharge side of the pump p, and the hollow chamber d is connected to the arcuate pipe r. Branch pipes s extend radially from the center, and nozzles t are provided at the ends or in the middle of the branch pipes s. The nozzle t may preferably be a jet nozzle that rotates on its own axis due to the liquid flowing inside.

Furthermore, h in FIGS. 2 and 3 represents the pump g.
h' is the valve, i is the piping that communicates with the above-ground receiving and discharging equipment, j is the floating roof, k is the stairs, and l is the ventilation room, respectively. show. In this embodiment, the vertical hollow chamber d is made of a concrete cylindrical body b, but it is not limited to this and may be made of a steel plate. Furthermore, as shown in Fig. 4, the fixed roof f consists of a bracket m provided at the top e of the vertical hollow chamber d, a beam n radially extending from the upper edge of the outer periphery of the tank, and a roof plate f' placed on top of the bracket m. Good.

Since this embodiment has the configuration as described above,
Receiving and discharging petroleum stored in the tank is a vertical hollow chamber d
When a floating roof j is provided, the outer wall of the vertical hollow chamber d is used as a guide to move up and down, and the top e of the vertical hollow chamber d is connected to the fixed roof f.
It becomes the support part of the central part of.

Also, the tank bottom oil sucked by the pump p from the suction pipe q is pressurized through the pump, separated radially through an arcuate pipe r and a branch pipe s, and is then separated radially through a plurality of nozzles t provided in each branch pipe s. Since the stored liquid moves and covers almost the entire bottom of the tank, it is possible to prevent sludge from accumulating. Since it can be installed without having to stand upright, there is no place where sludge can accumulate.

This device has the structure and function described above, and has a vertical hollow chamber d in the center of the tank that corresponds to a thick support, which makes it easier to construct a fixed roof, and also allows the span to be shaped like a dome. Since it is extremely short compared to the roof, the materials around the roof can be lightweight.
However, the roof can be made low, and in order to install the intake and expansion pumps, as shown in Figure 1A,
There is no need to dig deep vertical holes in line with the tank, making management and operation of the pump and associated valves extremely easy, reducing construction costs, shortening the construction period, and making operation and management extremely easy. Not only is it effective, but also an arcuate tube centered at the center of the tank is attached to the outer wall of the cylindrical body b without erecting a support on the bottom of the tank, and from the nozzle of the branch pipe radiating out from the arcuate tube. Since the stored liquid is injected, the stored liquid moves to cover the entire bottom of the tank and does not create a place where sludge accumulates, which has the effect of almost completely preventing the accumulation of sludge.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a typical underground tank for petroleum storage proposed in the past, and Fig. 2 is a longitudinal cross-section of an embodiment of the underground tank for petroleum storage according to this invention, excluding the sludge accumulation prevention device. Figure 3 is an enlarged longitudinal sectional view of the bottom of the vertical hollow chamber, Fig. 4 is a longitudinal sectional view of the vertical hollow chamber, Fig. 5 is a longitudinal sectional front view with the sludge accumulation prevention device attached, and Fig. 6 is a longitudinal sectional view of the bottom of the vertical hollow chamber. Each figure shows a cross-sectional plan view, b is a cylindrical body, d is a vertical hollow chamber, e is its top, f is a fixed roof, p is a liquid circulation pump, q
denotes a suction tube, r denotes an arcuate tube, s denotes a branch tube, and t denotes a nozzle.

Claims (1)

[Scope of utility model registration request] A vertical hollow chamber d is erected in the center of an underground tank for storing petroleum, the top e of the hollow chamber d serves as a support for the fixed roof f of the tank, and the hollow chamber d is used for storing oil stored in the tank. The hollow chamber d also serves as a pump chamber for receiving and discharging liquids.
A suction pipe q is opened to protrude into the tank from below the cylindrical body b, which is the outer wall of the hollow chamber, and this opening is communicated with the suction side of the pump p. An arcuate tube r is disposed with a support U extending from the outer wall of the cylindrical body b, a part of the arcuate tube r is communicated with the discharge side of the pump p, and a part of the arcuate tube r is connected to the discharge side of the pump p. An underground tank for storing petroleum products, characterized in that branch pipes s extend radially from the center of the hollow chamber d, and a nozzle t is provided at the end or in the middle of the branch pipe s.