JPH08285199A - Liquid preventive device - Google Patents

Abstract

PURPOSE: To prevent leakage of poisonous gas generated from liquid flowing out of a tank, and prevent a crack or a hole from being generated by sprinkled fire foam in a liquid preventive device having a dike having a fire foam sprinkling equipment arranged so as to surround the tank. CONSTITUTION: A discharge cylinder 6 of poisonous gas generated from liquid 4 flowing out of a tank 1 is arranged between the tank 1 and a dike 2 having a fire foam sprinkler 3 arranged so as to surround the tank 1 to house the liquid such as a fuel liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid preventive device having a liquid preventive dike having a fire extinguishing foam spraying facility used for a methanol storage base or the like.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional liquid-proof device used in a methanol storage base or the like. Reference numeral 1 denotes a fuel tank, and an annular liquid barrier 2 is arranged so as to surround the fuel tank 1, and a fire-extinguishing foam spreader for spraying fire-extinguishing foam toward the fuel tank 1 is provided on an upper portion of the liquid-filling dam 2. 3 is provided.

In this liquid-proof device, when the fuel liquid flows out from the fuel tank 1, the fire-foam spreading machine 3 sprays the fire-foam 5 and forms a layer of the fire-foam 5 on the liquid surface of the fuel liquid 4 which has flowed out. Prevents heat input from the outside and suppresses external diffusion. However, as time passes, cracks or holes 11 in the layer of fire-extinguishing foam 5
Therefore, the harmful gas generated from the fuel liquid 4 leaks from an uncertain place.

[0004]

In the above conventional liquid-proof device, the gas from the fuel liquid is present at the interface between the fuel liquid flowing out of the fuel tank and the layer of the fire-extinguishing foam, and the layer of the fire-extinguishing foam is present. A crack or a hole will be generated from inside, and harmful gas will leak from an uncertain place.

The present invention is intended to provide a liquid-proof device capable of solving the above problems.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a liquid preventive apparatus including a liquid preventive bank having a spraying facility for extinguishing foam arranged around a tank containing a liquid, the liquid preventive bank and the tank. An exhaust pipe for the gas generated from the liquid flowing out of the tank is provided between them.

[0007]

In the present invention, a layer of fire-extinguishing foam sprayed from the equipment for spraying fire-extinguishing foam is formed on the liquid surface of the liquid flowing out of the tank, and the fire-extinguishing fire sprayed from the equipment for spraying liquid leaking from the tank and fire-foaming At the interface of bubbles, harmful gas from the liquid is generated. This harmful gas is discharged from the gas discharge tube, which has a lower resistance than the fire extinguishing bubbles above. As a result, the gas pressure of the harmful gas is reduced, so that the occurrence of cracks or holes in the fire-extinguishing foam formed on the leaked liquid is reduced, and the discharge location of the harmful gas is limited to the gas discharge tube.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. A plurality of gas discharge tubes 6 are arranged between the liquid barrier 2 and the fuel tank 1, and are connected to a harmful gas treatment facility 8 via a connecting pipe 7. In the gas exhaust pipe 6,
A vertical slit 9 having a height equal to or higher than the maximum liquid level calculated from the maximum storage amount of the fuel tank 1 and the volume of the liquid barrier 2 is provided from the lower end, and the inflow of the fire extinguishing foam 5 is prevented in this slit 9. Wire mesh is installed. The configuration of this embodiment other than the above is the same as that of the conventional liquid-proof device shown in FIG. 3, and the same parts in FIGS. 1 and 2 as those in FIG. Is omitted.

In this embodiment, the fuel liquid 4 flows out between the fuel tank 1 and the liquid bank 2 due to damage to the fuel tank 1 or the like.
The fire-extinguishing foam sprayer 3 sprays the fire-extinguishing foam 5 on the upper part of the fuel liquid 4 that has flown out, and forms a layer of the fire-extinguishing foam 5 on the fuel liquid 4 that has flown out. The harmful gas 10 generated from the fuel liquid 4 that has flowed out is prevented from diffusing to the upper part by the layer of the fire extinguishing foam 5, so that it enters from the slit 9 provided in the slit of the gas discharge tube 6 and through the connecting pipe 7. It is guided to the harmful gas processing facility 8 and processed.

Further, since the harmful gas 10 is discharged from the gas discharge tube 6 to the harmful gas treatment facility 8 as described above, the gas pressure of the harmful gas 10 is lowered, and cracks or holes are generated in the layer of the fire extinguishing foam 5. Is prevented.

[0011]

According to the present invention, the occurrence of cracks or holes in the layer of fire-extinguishing foam formed on the liquid flowing out from the tank is reduced, and the harmful gas generated from the liquid flowing out from the tank is discharged. Since it is discharged from the cylinder, safety is secured.

Further, since the re-injection of the fire extinguishing foam performed when a crack or a hole is generated in the layer of the fire extinguishing foam is reduced, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a liquid-proof device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a gas discharge portion of the gas discharge cylinder of the embodiment.

FIG. 3 is a schematic view of a conventional liquid-proof device.

[Explanation of symbols]

 1 Fuel Tank 2 Liquid Levee 3 Fire Extinguisher Disperser 4 Fuel Liquid 5 Fire Extinguishing Foam 6 Gas Discharge Cylinder 7 Connecting Pipe 8 Hazardous Gas Treatment Facility 9 Slit 10 Hazardous Gas

Claims (1)

[Claims] 1. A liquid preventive device comprising a liquid barrier, which is arranged around a tank containing a liquid and has a spraying device for extinguishing foam, wherein liquid flowing out from the tank is provided between the liquid barrier and the tank. A liquid-proof device having a discharge tube for the generated gas.