JPS6335989Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration damping device for a floating roof in a large floating roof type storage tank for storing crude oil and other volatile liquids. As is well known, in large floating roof storage tanks that store large quantities of crude oil and other volatile liquids, when strong external dynamic energy such as earthquakes or storms is applied, the liquid level shakes and the floating roof is damaged. It is known to oscillate.

Particularly in the case of an earthquake, when the primary natural period of the stored liquid and the vibration period of the storage tank almost match, the stored liquid resonates, causing the liquid level to fluctuate significantly, causing a so-called sloshing phenomenon.

If the sloshing phenomenon occurs, the floating roof and the surrounding wall of the storage tank will collide, causing the floating roof or the surrounding wall of the storage tank to be destroyed, resulting in a secondary accident due to leakage of the stored liquid, resulting in an extremely dangerous situation. Therefore, in order to prevent this sloshing phenomenon, for example, a water control plate that divides the free liquid level is installed on the underside of the floating roof to suppress the swinging of the free liquid level, or other measures are taken to prevent the floating roof from swinging. Various efforts have been made to do so.

The present invention is also a device to prevent the floating roof from swinging, and the sealing device installed around the outer circumference of the floating roof is equipped with a type of air bag structure that automatically activates when it senses the swinging of the floating roof. A brake device is incorporated, and its braking action suppresses the swinging of the floating roof.

The gist of the invention is that an air bag 4 is interposed inside or outside of a sealing device 3 made of an elastic material, and this air bag 4 and a pressure accumulator 6 installed on a floating roof 5 are connected by a pipe 7. An emergency activation valve 8 is provided in the middle of the piping 7, and this emergency activation valve 8 is connected to a rocking sensor 9 provided on the floating roof 5. When the sensor 9 is activated, the emergency activation valve 8
automatically opens and inflates air bag 4,
The sealing device 3 or the air bag 4 itself is pressed against the storage tank peripheral wall 1 by the expansion force, and the pressure is applied to brake the swinging of the floating roof 5.

To explain this in more detail based on the drawings of the embodiment, FIG. 1 shows a large floating roof type storage tank in which a sloshing phenomenon occurs, and the floating roof 5 swings within the storage tank as shown by dotted lines.

As a result, the floating roof 5 and the storage tank peripheral wall 1 collide,
There is a risk that the floating roof 5 or the surrounding wall 1 of the storage tank will be destroyed and the stored liquid will spill out.

Therefore, as described above, the present invention has been developed by interposing an air bag 4 in advance on the inside or outside of the sealing device 3 made of an elastic material assembled on the outer periphery 2 of the floating roof, in FIG. The air bag 4 is connected to a pressure accumulator 6 provided on the floating roof 5 through a pipe 7, and an emergency operation valve 8 is provided in the middle of the pipe 7. When the sensor 9 is activated, the emergency operation valve 8 automatically opens and inflates the air bag 4, so that the sealing device 3
Alternatively, an air bag 4 (a sealing device in the illustration) is pressed against the storage tank peripheral wall 1 as shown in FIG. 3 to apply a brake to the swinging of the floating roof 5. In addition, the air bag 4 is assembled by dividing the outer circumference of the floating roof into an appropriate number of blocks, and connecting a pressure accumulator 6 to each divided block, and an emergency operation valve 8.
And the vibration sensor 9 is installed corresponding to the pressure accumulator 6, respectively.

If any one of the rocking sensors 9 is activated, its detection signal is communicated to all the emergency operating valves 8. That is, it is configured to supply braking pressure from the pressure accumulator 6 to each of the air bags 4 disposed around the entire outer circumference of the floating roof.

Since the present invention is constructed as described above, if the storage tank receives dynamic energy from the outside such as an earthquake and the floating roof 5 shakes, the emergency activation valve is activated by the signal from the shake sensor 9. 8 opens, the air bag 4 is inflated by the pressure from the pressure accumulator 6, and the floating roof 5 is locked to the storage tank peripheral wall 2 by the pressure.

That is, the swinging of the floating roof 5 is controlled by the expansion pressure of the air bag 4 built into the outer periphery of the floating roof 5. Therefore, compared to conventional floating roofs with water control plates attached to the bottom surface,
It is capable of reliable vibration damping operation and has an extremely suitable structure as a safety device for large storage tanks.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the left half of a large floating roof type storage tank longitudinally showing the vibration of the floating roof due to sloshing, and Fig. 2 shows an embodiment of the floating roof vibration damping device according to the present invention. A vertical sectional side view of the main part of a sealing device made of materials with an air bag built into the inside;
FIG. 3 similarly shows a longitudinal sectional side view showing the operating state of the device. 1...Storage tank peripheral wall, 2...Floating roof outer periphery, 3...Seal device, 4...Air bag, 5...Floating roof,
6...Pressure accumulator, 7...Piping, 8...Emergency operation valve,
9... Shaking sensor.

Claims (1)

[Scope of utility model registration request] In order to seal between the storage tank peripheral wall 1 and the floating roof outer periphery 2, in a floating roof type storage tank in which a sealing device 3 made of an elastic material is attached to the floating roof outer periphery 2, an air bag 4 is installed inside or outside of the sealing device 3. The air bag 4 and the pressure accumulator 6 installed on the floating roof 5 were connected by a pipe 7, and an emergency operation valve 8 was installed in the middle of the pipe 7, and this emergency operation valve 8 was installed on the floating roof 5. Connected to the vibration sensor 9, the sensor 9
When the emergency operation valve 8 is activated, the emergency operation valve 8 automatically opens, inflates the air bag 4, and seals the sealing device 3.
Alternatively, there is provided a vibration damping device for a floating roof in a floating roof type storage tank, wherein the air bag 4 itself is brought into pressure contact with the storage tank peripheral wall 1, and the floating roof 5 is locked to the storage tank peripheral wall 1 to apply a brake to the swinging.