SU1003856A1 - Device for monitoring leakages of fight-extinguishing liquid - Google Patents

Description

The invention relates to fire fighting equipment. ^:

A device for monitoring leaks of extinguishing fluid stored in a container under pressure, containing a measuring tube mounted parallel to the tank [1J.

The disadvantage of this device is the low accuracy of the control fluid, which has a critical temperature close to the operating temperatures of the plants, due to the lack of a boundary between the liquid and gaseous phases.

The purpose of the invention is to improve the accuracy of monitoring fluid leaks.

This goal is achieved by the fact that the device for monitoring leaks _. A 2θ extinguishing liquid stored in a pressure vessel containing a measuring tube installed parallel to the vessel has a liquid thermostat, valves and a pressure indicator, the measuring tube being placed 25 in the thermostat and connected to the pressure indicator and through valves with the upper and lower parts of the vessel, at the same time, as the heat carrier in the thermostat used liquid with a temperature of 30 swarm boiling above the boiling point of the controlled liquid.

The drawing shows a diagram of a device for monitoring leaks of extinguishing fluid.

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The device consists of containers 1, 2, 3 and 4, the upper and lower cavities of which are connected by collectors 5 and

6. A shut-off valve 7 is installed on the manifold 6, through which the battery is charged, and a valve 8, through which the extinguishing agent is released into the protected premises. On the manifold 5, a valve 9 is installed, through which it is vented. part of the extinguishing agent when the pressure in the containers exceeds the working one. In parallel with the tanks, a measuring tube 10 is connected to the collectors 5 and 6 through shutoff solenoid valves 11 and 12. The measuring tube 10 is placed in a thermostat 13 with a coolant whose boiling point is higher than the critical temperature of the extinguishing liquid. In the thermostat 13 is a heating element 14, made, for example, in the form of an electric coil. Measuring tube 10 is connected to the meter, pressure 15 ,. included in the signal device circuit.

The device operates as follows.

In standby mode, valves 11 and 12 are open. At an ambient temperature of 5 below the critical temperature, most of the substance is in the liquid phase.

To determine the leakage, the valves 11 and 12 are fixed, the electric heater 10 is connected to the electrical network, the coolant in the thermostats 13 is brought to a boil, while the extinguishing fluid in the steam tube, heating to 15, the boiling point of the coolant in the thermostat 13, passes into the gaseous phase.

The amount of extinguishing fluid present in the installation during the J0 checks is determined based on the pressure readings P from the pressure gauge 15.

The leakage value zj Q is calculated by the formula 25

AQ = Q _o - - ^ ΚιΚ ₂ , where ZQ is the leakage mass of the extinguishing agent from the installation, kg; Q _o - the initial supply of extinguishing agent in the installation

ke, kg; the mass of the extinguishing agent in the installation during the test period, kg;

- Clapeyron's formula, which determines the relationship between the mass of an ideal gas, pressure and volume;

- a coefficient that takes into account the degree of imperfection of a real gas (extinguishing agent) compared to ideal, is determined experimentally;

Kj - coefficient taking into account the ratio of the volume of the capacities of the installation and the tube;

P is the absolute gas pressure in the tube, equal to the sum of the excess and barometric pressure, kg / m ² ;

V is the tube volume, m3;

T is the absolute boiling point of the liquid in the glass, ° K;

R is the gas constant of the fire extinguishing agent KG, - _ ' ^{kg s}

At an ambient temperature higher than critical, all extinguishing fluid is in a gaseous state and, with valves 11 and 12 open, evenly distributes?

The magnitude of the leakage of the extinguishing fluid in this case is also determined by the above formula, only the boiling point of the coolant in the thermostat is replaced by the value of the ambient temperature.

The proposed device allows you to reliably control the leakage of the extinguishing agent, _ in a two-phase state of aggregation and to carry out this control remotely.

Claims (1)

meter, pressure 15 ,. included in the chain signaling device. The device works as follows. In standby mode, valves 11 and 12 are open. When the ambient temperature is below critical, most of the substance is in the liquid phase. To determine the leakage, the valves 11 and 12 are fixed, the electrical heater is connected to the electrical network, the heat carrier in the thermostats 13 is brought to a boil, while the fire extinguishing fluid inside the steam tube is heated to the boiling point of the heat carrier in a thermostat 13, enters the gaseous phase. The amount of fire extinguishing fluid Q that is in the installation at the time of npOBepi f is determined based on the pressure P readings from pressure gauge 15. The leakage volume l Q is calculated using the formula lr QO - irK-, K2, where 4Q is the mass of the extinguishing agent from the installation., kg; QO - initial stock of extinguishing agent in the installation PV ke, kg; Kg The mass of extinguishing agent in the installation at the time of the test j kg; - Clapeyron formula, defined as the ratio between the mass of an ideal gas, pressure and volume; the coefficient taking into account the degree of imperfection of the real gas (extinguishing agent) in comparison with the ideal gas is determined experimentally; coefficient taking into account the ratio of the capacity of the installation and the tube; the absolute pressure of gas in the tube, equal to the sum of the excess of the exact and barometric pressure, kgf / m-; -the volume of the tube, m3; - absolute boiling point of the liquid in the glass, K; - gas constant of the extinguishing agent. When the ambient air temperature is above the critical one, the extinguishing fluid is in a gaseous state and with valves 11 and 12 open evenly distribute with c. in all containers under a certain pressure, depending on the amount of the substance in the installation and the ambient temperature. : The leakage rate of the extinguishing liquid in this case is also determined by the above formula, only the value of the boiling point of the heat transfer fluid in the thermostat is replaced by the value of the temperature of the surrounding air. The proposed device allows to reliably control the leakage of the extinguishing agent found in the two-phase state of aggregation and, to make this control remotely. Claims An apparatus for monitoring leaks of extinguishing liquid stored in a container under pressure, comprising a measuring tube installed parallel to the container, characterized in that, in order to improve the control accuracy, it has a liquid thermostat, valves and a pressure indicator, and in the thermostat and connected to the pressure indicator and through the valves from the upper and lower parts of the tank, while the fluid in the thermostat is a liquid with a boiling point exceeding mperaturu controlled boiling liquid. Sources of information taken into account in the examination 1. Yakovlev L, G. Level gauges. M., 1964, p. 51, FIG. sixteen. J Alla to signal}) ZeTlC tt f3