JPS6229424Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tank for storing oil or the like.

There are three types of tanks that store liquids under atmospheric pressure: fixed roof type, floating roof type, and floating roof type with fixed roof. The floating roof prevents evaporation loss of the contents, and the fixed roof protects from the effects of wind, rain, snow and pollution.However, in the event of an earthquake,
If the liquid level vibrates, causing the so-called sloshing phenomenon, and the floating roof on the liquid surface shakes as shown in Figure 4, if the liquid is almost full, it will move as shown by the chain line in Figure 4. In this case, the upper edge of the outer surface of the pontoon 5', which is a floating roof, collides with the corresponding part of the fixed roof 2', and an accident is likely to occur in which the pontoon 5' or both the pontoon and the fixed roof are damaged. Also, the reduction in the effective volume of the tank was considered unavoidable due to the double roof structure.

This idea is that in the floating roof type tank with a fixed roof, if the part of the floating roof pontoon that contacts the fixed roof is configured in a shape that fits the lower surface of the fixed roof, the above damage accident can be prevented and the floating roof can be raised. Focusing on the point that by increasing the height as much as possible, the effective volume of the tank can be increased by that amount, the upper edge part that extends from the upper surface of the pontoon to the outer surface is formed as a beveled surface along the lower surface of the fixed roof.

As is well known, a floating roof tank with a fixed roof is covered with a fixed roof 2' whose upper surface is connected to a peripheral wall 1', as shown in Fig. 1, and has a floating roof above the internal storage liquid level. 3' seems to be floating. This floating roof 3' is usually of the pontoon type, and as shown in Fig. 2, it has an annular shape with the interior divided into a number of chambers around the periphery of a flat roof plate 4', similar to that of floating roof tanks. A pontoon 5' is provided, and the upper and lower surfaces of the pontoon 5' are formed into inclined surfaces that gradually widen upward and downward toward the outer periphery.

This idea takes advantage of the fact that a floating roof tank with a fixed roof does not require any rainwater drain equipment, which is required for a floating roof tank, by making the pontoon almost horizontal on its top surface as shown in Figure 3. , and the upper edge of the outer surface was formed into a beveled surface 6 along the corresponding part of the lower surface of the fixed roof 2. Due to this structure, even in the event of a collision with the lower surface of the fixed roof due to fluctuation of the liquid level, the shape remains sharp compared to the conventional one. Since there is surface contact with each other compared to the conventional floating roof type with a fixed roof, it is less likely to cause damage, and even if damage occurs, the damage can be minimized, which is superior in terms of safety. When the pontoon rose, the upper edge of the outer surface of the pontoon got stuck on the lower surface of the fixed roof and could not rise any further.
As shown by the chain line in the figure, the beveled surface 6 is the fixed roof 2.
Since the pontoon 5 can be raised until it meets the lower surface, and the pontoon 5 has a horizontal upper surface necessary for maintaining buoyancy, the roof plate 4 can also be raised higher, and therefore the amount of oil stored can be expected to increase accordingly. For example, in a 25,000Kl tank, it is possible to increase the capacity by about 350Kl, which is about 1.4% of that capacity. In FIG. 3, 1 is a side wall and 7 is a seal.

As described above, this invention has a simple structure, allows easy modification of conventional equipment, and is extremely efficient.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional floating roof tank with a fixed roof, Fig. 2 is an explanatory diagram showing the structure of a conventional floating roof, Fig. 3 is an explanatory diagram of the main part of this invention, and Fig. 4 is an explanatory diagram of the structure of a conventional floating roof. FIG. 2 is an explanatory diagram showing fluctuations in the liquid level due to the sloshing phenomenon in the tank of FIG. 1; Codes in the figure: 1, 1' are side walls, 2, 2' are fixed roofs, 3, 3' are floating roofs, 4, 4' are roof plates, 5,
5' is a pontoon, 6 is a beveled surface, and 7 is a seal.

Claims (1)

[Scope of utility model registration request] In a floating roof type tank with a fixed roof, the upper surface of the floating roof pontoon 5 is substantially horizontal, and the upper edge portion extending from the upper surface to the outer surface is formed into a beveled surface 6 along the lower surface corresponding part of the fixed roof 2. Floating roof tank with roof.