SU797702A2 - Device for extinguishing fire in reservoir - Google Patents

Description

one

The invention relates to fire fighting equipment and is intended to protect petroleum tanks from fires,

A device for extinguishing a fire in a tank is known, according to the main auth. 621354 containing a foam generator having a dispenser and a net pipe for supplying a foaming agent solution to the dispenser, a foam pipe connecting the gas space of the tank with the foam generator cavity, and an airtight valve separating the foam generator cavity from the external medium, made in the form of a liquid filled bowl, in which the end of the foam generator body is placed with a gap relative to its bottom and walls.

The disadvantage of this device is the incomplete sealing of the gas space of the tank. Due to the fact that the level of the sealing liquid poured into the bowl is below the cut edge of the sprayer, vapors of light fractions of petroleum products stored in the tank leak through the sprayer outlet and the connecting line to supply the frother solution. In the standby mode, a pair of light fractions of petroleum products accumulates in the line intended for supplying the solution and being in a dried state, which, with accidental leaks in flange connections or depressurization during maintenance and repair work, on the highway or near leaks to crash.

The purpose of the invention is to improve reliability in operation by eliminating the leakage of the gas phase of the oil product.

5 of the reserve.

The goal is achieved by the fact that the pipeline for supplying the foaming agent solution is curved, with one of its sections located above the liquid level in the bowl and has a piercing connection between the internal cavity of the pipeline and the atmosphere, and the atomizer is located below the liquid level in the bowl.

The pipeline is located above the liquid level in the bowl by the amount of a liquid column exceeding the design pressure of the gas phase of oil products in the tank.

The drawing schematically shows the proposed device.

The device consists of an foam cone f connecting the body of the foam generator 2 with the gas space 3 of the tank being protected 4. In the body of the foam generator there are grids 5 and a pipe 6 with a spray gun 7 with an outlet 8,

The part of the pipeline 9 that leaves the sprayer rises above the level of liquid 10 in the bowl 11 by the amount of a liquid column exceeding the calculated pressure of the gas phase of oil products in the tank. On the section of pipeline 9, a hole 12 is made, which connects the internal cavity of the pipeline b with the atmosphere.

The device works as follows,

During the waiting period, the liquid 10 hermetically separates the internal cavity of the foam generator 2, which is connected to the gas space, from both the external environment and the foaming solution supply line 9. In order to avoid suction of the sealing liquid into the solution-carrying line when the filling air is cooled, the small hole 12 in the dry line is constantly open, providing a pressure equation in the highway with atmospheric,

At the moment of the start of operation, the foaming solution, the passage under pressure through the pipeline 9, will displace the sealing liquid 10 from the spray gun 7 and leave the opening 8 in the form of a spray jet. The energized spray jet creates a discharge in the bowl 11, which will cause the lift of the sealing fluid 10, its release together with the foaming solution through the grids 5 and the removal of the foam through the foam pipe 1 into the volume of the tank 4. Thus, the sealing fluid will be transferred to the tank the level in the bowl 11 does not fall below the end of the foam generator 2, forming an open slot (Between the end of the foam generator and the bottom of the bowl, the shutter will be depressurized and the air flow necessary for normal operation of the foam generator totor will be from Covered unhindered passage.The foam generator goes to the normal mode of operation and provides foam to the fire.

The effectiveness of the proposed device is based on obtaining maximum tightness of the foamer in the standby mode due to reliable sealing of the supply line solution.

Claims (1)

Invention Formula 1, Fire extinguishing device in the tank according to avt., Cf. No. 621354, characterized in that, in order to increase reliability in operation by excluding leakage of the gas phase of the oil product from the tank, the pipeline for supplying the frother solution is made bent, one of its sections is located above the level of the liquid in the bowl and has a hole that connects the internal cavity of the pipeline with the atmosphere, and the dispenser is located below the level of the liquid. in the bowl, 2, The device according to claim 1, characterized in that the pipeline is located above the level of the liquid in the bowl by the amount of the liquid column exceeding the calculated pressure of the gas phase of the oil products in the tank. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 621354, Cl, A 62 C 5/04, 1976, WITH "7 / IG -. " .