JP2010069198A - Foam fire extinguishing agent mixing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a foam fire extinguishing agent mixing system capable of facilitating maintenance and management and reducing running cost. <P>SOLUTION: In the foam fire extinguishing agent mixing system, orifices 5, 10 are respectively arranged in a water pipe 4, to which water is supplied by a pump 3 for water, and in a foam fire extinguishing agent pipe 9, to which a foam fire extinguishing agent is supplied by a pump 8 for the foam fire extinguishing agent. The pressure of the water and the pressure of the foam fire extinguishing agent on the primary sides of the respective orifices 5, 10 are controlled to be the equal pressure, and the water and the foam fire extinguishing agent passing through the respective orifices 5, 10 are mixed in a mixing pipe 11, so as to be discharged. Pressure sensors 13, 14 are respectively arranged in the water pipe 4a and the foam fire extinguishing agent pipe 9a on the primary sides of the respective orifices 5, 10. The pump 8 for the foam fire extinguishing agent includes an inverter control circuit 17 for controlling the number of rotation in the pump 8 for the foam fire extinguishing agent, so as to adopt the outputs of the respective pressure sensors 13, 14 as inputs and to allow the pressure of the water on the primary side to coincide with the pressure of the foam fire extinguishing agent on the primary side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a foam extinguishing agent mixing system for mixing water and a foam extinguishing agent at a predetermined ratio in a foam extinguishing facility.

  Conventionally, in foam extinguishing equipment, as a foam extinguishing chemical mixing system that mixes water and foam extinguishing chemical at a predetermined ratio, those of the isobaric mixing method (pressure side proportioner) and the differential pressure mixing method (pressure Proportioner). (For example, refer nonpatent literature 1 or patent literature 1.).

  In the foam-extinguishing agent mixing system of the isobaric mixing method, orifices are respectively provided in the water pipe into which water and the foam-extinguishing agent are sent and the foam-extinguishing agent pipe, and the pressure of the water on the primary side of each orifice and the foam-extinguishing agent The pressure is controlled so as to be equalized by an isobaric valve, and the water and the foam extinguishing agent passing through the orifices are mixed by a mixing pipe.

In addition, the differential pressure blending foam extinguishing agent mixing system has an orifice in each of the water piping into which water and foam extinguishing agent are sent and the foam extinguishing agent piping, and stores the foam extinguishing agent in the pressurized water sent to the water piping. The foam extinguishing agent tank is introduced, pressurized with the pressure of the foam extinguishing agent, sent to the foam extinguishing agent piping, and the water and the foam extinguishing agent passing through the orifices are mixed in the mixing piping. This differential pressure mixing type foam fire extinguishing agent mixing system has a diaphragm installed in the foam extinguishing agent tank, the foam extinguishing agent is accommodated in the diaphragm, and pressure water is pumped outside the diaphragm in the foam extinguishing agent tank. The type that pressurizes the diaphragm and sends the foam extinguishing agent into the foam extinguishing agent piping, and the foam extinguishing agent is directly stored in the foam extinguishing agent tank, and the pressure is applied to the upper surface of the foam extinguishing agent in the foam extinguishing agent tank There is a type that pressurizes water and pressurizes foam fire extinguishing agent and sends it to the foam extinguishing agent piping.
"Lecture text 2nd edition on general inspection of foam fire extinguishing equipment in outdoor tank storage" issued by the Dangerous Goods Safety Technology Association on September 15, 2006, p73-p80 JP-A-6-262053

  However, there are the following problems in the foam-extinguishing chemical mixing system of the isobaric mixing method.

(A) If the isobaric valve is left without being used for a long period of time, the performance tends to deteriorate due to adhesion of internal parts by the foam extinguishing agent remaining inside, corrosion due to the foam extinguishing agent remaining inside, and the like.

(B) When checking the function of the isobaric valve, it is necessary to actually operate the foam extinguishing equipment of the foam extinguishing agent mixing device, and it takes a lot of time and effort to dispose of a large amount of aqueous foam solution generated at that time. A huge expense.

  On the other hand, the differential pressure blending foam fire-extinguishing agent mixing system has the following problems.

(A) The foam fire-extinguishing agent tank for storing the foam-extinguishing agent needs to be a pressure vessel and is expensive.

(B) If the fire extinguishing agent cannot be replenished during the operation of the foam extinguishing equipment, and it takes time for the fire extinguishing activity, it is necessary to cope with another means (fire engine etc.) in order to continue the fire extinguishing activity. In the case of a type in which a diaphragm is accommodated in a foam fire extinguishing agent tank, the foam extinguishing agent is put into the diaphragm and pressurized with pressurized water from the outside, the foam extinguishing agent is pumped and filled into the diaphragm with a pump. In doing so, there is a risk of damaging the diaphragm.

(C) In the case of a foam fire-extinguishing chemical mixing system that contains a diaphragm in the foam fire-extinguishing agent tank, it is confirmed from the outside of the foam extinguishing agent tank whether the diaphragm in the foam-extinguishing agent tank is inflated or deflated. Therefore, it is difficult to check the amount of the foam extinguishing agent filled by conventional liquid level measurement, and it is difficult to manage the storage amount of the foam extinguishing agent. In addition, the diaphragm may be damaged by a water hammer generated on the water piping side when the system is started or stopped.

(D) In the case of the foam-extinguishing chemical mixing system in which the diaphragm is accommodated in the foam-extinguishing chemical tank, since the diaphragm is made of rubber, it is easily deteriorated in a short time, and the life of the diaphragm is short. Running costs are high due to purchase and replacement costs for newly exchanging diaphragms.

  An object of the present invention is to provide a foam extinguishing agent mixing system that facilitates maintenance and can reduce running costs.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that an orifice is provided in a water pipe into which water is sent by a water pump and a foam fire-extinguishing chemical pipe into which foam-extinguishing chemical is sent by a foam-extinguishing chemical pump. Each of the orifices is controlled so that the pressure of the water on the primary side of each orifice and the pressure of the foam extinguishing agent are equal to each other, and the water and the foam extinguishing agent passing through each of the orifices are mixed in a mixing pipe. A foam extinguishing agent mixing system to be sent out, wherein pressure sensors are respectively provided in a water pipe and a foam extinguishing agent pipe on the primary side of each orifice, and an output of each pressure sensor is supplied to the foam extinguishing agent pump. As an input, an inverter control circuit is provided for controlling the rotation speed of the foam fire-extinguishing agent pump so that the primary water pressure and the primary foam extinguishing agent pressure coincide with each other. And butterflies.

  According to a second aspect of the present invention, the pump for water according to the first aspect is provided with a pressure setting means for setting a pressure of the water on the primary side and a water pipe on the primary side of the orifice. And an inverter control circuit for controlling the rotational speed of the water pump so that the pressure of the water on the primary side becomes a pressure set by the pressure setting means with the output of the pressure sensor as an input. It is characterized by.

  Invention of Claim 3 is located in the downstream of the said pressure sensor provided in this foam fire extinguishing chemical | medical agent piping in the foam extinguishing chemical | medical agent piping of the primary side of Claim 1 or 2, A circulation bypass pipe communicating with the foam fire-extinguishing agent tank for containing the foam extinguishing agent is connected, and the foam extinguishing agent pipe between the orifice and the circulation bypass pipe connection position is closed during a test operation and opened during a normal operation. A test valve is provided, and the circulation bypass pipe is provided with a test valve that opens during a test operation and closes during a normal operation.

  According to the foam fire-extinguishing chemical mixing system according to claim 1, pressure sensors are respectively provided in the water piping and the foam fire-extinguishing chemical piping on the primary side of each orifice, and the pump for the foam fire-extinguishing chemical is provided with each pressure. Since an output of the sensor is used as an input, an inverter control circuit is provided for controlling the rotational speed of the foam fire-extinguishing agent pump so that the primary water pressure and the primary-side foam extinguishing agent pressure coincide with each other. The foam extinguishing agent can be fed into the foam extinguishing agent piping on the primary side of the orifice at the same pressure as the water pressure in the water piping on the primary side of the orifice.

  Then, by controlling the rotation speed of the foam extinguishing agent pump by an inverter control circuit, the foam extinguishing agent is always supplied to the primary extinguishing agent piping on the primary side with the same pressure as the water pressure in the water piping on the primary side of the orifice. Since it is fed, there is no need for an isobaric valve in the conventional foam-extinguishing chemical mixing system of the constant pressure blending system, and there is no need to adopt a foam-extinguishing chemical mixing system of the differential pressure blending system. The problems in the fire extinguishing agent mixing system and the differential pressure mixing type foam extinguishing agent mixing system can be solved.

  According to the foam fire-extinguishing agent mixing system according to claim 2, the water pump according to claim 1 is provided with a pressure setting means for setting a pressure of the water on the primary side. An inverter that controls the number of rotations of the water pump so that the pressure of the primary water becomes the pressure set by the pressure setting means by using the output of the pressure sensor provided in the primary water pipe as an input Since the control circuit is provided, the water discharge amount can be easily controlled by setting the pressure of the water on the primary side by the pressure setting means. For example, the water discharge amount can be immediately adjusted according to the fire extinguishing situation. It becomes possible to control.

  According to the foam-extinguishing agent mixing system according to claim 3, the foam-extinguishing agent pipe on the primary side of the orifice according to claim 1 or 2 is downstream of the pressure sensor provided in the foam-extinguishing agent pipe. A circulation bypass pipe communicating with a foam fire-extinguishing agent tank that contains the foam-extinguishing agent is connected to the foam-extinguishing agent pipe between the orifice and the circulation bypass pipe connection position during the test operation. A test valve that is closed and opened during normal operation is provided, and the circulation bypass pipe is provided with a test valve that is opened during test operation and closed during normal operation. Therefore, the pressure sensor, the inverter control circuit, and the pump When performing test operation for functional inspection, etc., by closing the test valve provided in the foam fire extinguishing chemical pipe and opening the test valve provided in the circulation bypass pipe, The foam extinguishing agent sent from the tank to the foam extinguishing agent pipe flows to the circulation bypass pipe and is returned to the foam extinguishing agent tank, and circulates in the foam extinguishing agent tank, the foam extinguishing agent piping, and the circulation bypass pipe. It is possible to eliminate the generation of aqueous foam solution that must be disposed of by industrial disposal, which was not in contact with foam fire extinguishing agents, and required a great deal of labor and cost in conventional test operations. It can be lost.

  Hereinafter, the best mode for carrying out the foam-extinguishing agent mixing system according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

  FIG. 1 is a schematic explanatory view showing the configuration of a first embodiment of a foam fire-extinguishing agent mixing system according to the present invention.

  In the foam fire-extinguishing chemical mixing system of this example, water 1 is stored in a water source water tank 2, pumped up by a water pump 3, and sent into a water pipe 4. The water pump 3 includes a pumping mechanism 3a composed of a rotor that pumps water, and a motor 3b that rotates the pumping mechanism 3a. The water pipe 4 is provided with an orifice 5 for water.

  The foam extinguishing agent 6 is stored in the foam extinguishing agent tank 7 and is pumped up by the foam extinguishing agent pump 8 and sent to the foam extinguishing agent piping 9. The foam extinguishing agent pump 8 is composed of a pumping mechanism 8a for pumping the foam extinguishing agent 6 and a motor 8b for rotating the pumping mechanism 8a. The foam extinguishing agent piping 9 is provided with an orifice 10 for foam extinguishing agent.

  The secondary side water pipe 4a of the water orifice 5 and the secondary side foam fire extinguishing chemical pipe 9a of the foam fire extinguishing chemical orifice 10 are connected to the water 1 passing through the water orifice 5 and the foam extinguishing chemical. A mixing pipe 11 that mixes the foam extinguishing agent 6 that has passed through the orifice 10 is connected, and a discharge part 12 that discharges the mixed liquid of the water 1 and the foam extinguishing agent 6 is provided at the tip of the mixing pipe 11.

  The primary side water pipe 4b of the water orifice 5 is provided with a pressure sensor 13 for detecting the pressure of the water 1 in the primary side water pipe 4b, and the primary side foam extinguishing of the foam extinguishing agent orifice 10 is provided. The medicine pipe 9b is provided with a pressure sensor 14 for the foam fire-extinguishing chemical 6 in the primary-side foam fire-extinguishing chemical pipe 9b.

  And it connects with the motor 8b of the pump 8 for foam fire extinguishing chemicals via the pressure sensors 13 and 14 and the signal wires 15 and 16, and the output of the pressure sensors 13 and 14 is used as an input in the primary side water pipe 4b. Inverter control circuit 17 for controlling the rotation speed of the foam 8 for the foam fire extinguishing agent, that is, the rotation speed of the motor 8b, so that the pressure of the water 1 and the pressure of the foam extinguishing agent 6 in the primary foam extinguishing agent pipe 9b coincide. Is provided.

  In the foam extinguishing agent mixing system of the first embodiment configured as described above, the water 1 stored in the water source water tank 2 is pumped by the drive of the motor 3 b of the water pump 3 and is pumped to the water pipe 4. The foam fire extinguishing agent 6 stored in the foam extinguishing agent tank 7 is pumped up by the drive of the motor 8 b of the foam extinguishing agent pump 8, pumped to the foam extinguishing agent pipe 9, and the primary of the orifice 5 for water Pressure sensors 13, 14 provided on the primary water foam 4 b and the primary foam extinguishing chemical pipe 9 b of the foam extinguishing chemical 10 are connected to the pressure of the water 1 in the primary water piping 4 b and on the primary side. The pressure of the foam fire extinguishing agent 6 in the foam extinguishing agent piping 9b is detected.

  Pressure signals output from the pressure sensors 13 and 14 are input to the inverter control circuit 17 via the signal lines 15 and 16. The inverter control circuit 17 to which the pressure of the water 1 in the primary water pipe 4b and the pressure of the foam fire extinguishing chemical pipe 6 in the primary foam extinguishing chemical pipe 9b are input from the pressure sensors 13, 14 is the primary water piping. The rotation speed of the foam fire extinguishing agent pump 8, that is, the rotation speed of the motor 8 b is controlled so that the pressure of the water 1 in 4 b matches the pressure of the foam extinguishing agent 6 in the primary foam extinguishing agent pipe 9 b.

  Thus, the foam extinguishing agent 6 can be fed into the primary extinguishing agent piping 9b on the primary side of the foam extinguishing agent orifice 10 at the same pressure as the pressure of the water 1 in the water piping 4b on the primary side of the orifice 5 for water. it can.

  Then, the rotation speed of the foam extinguishing agent pump 8 is controlled by the inverter control circuit 17 so that the foam extinguishing agent 6 is always extinguished with the same pressure as the water 1 in the water pipe 4 b on the primary side of the water orifice 5. Since it is sent to the foam extinguishing agent piping 9b on the primary side of the orifice 10 for the medicine, there is no need for an isobaric valve in the conventional foam-extinguishing chemical mixing system of the constant pressure mixing type, and the foam extinguishing chemical mixing system of the differential pressure mixing type No need to adopt

  FIG. 2 is a schematic explanatory view showing the configuration of the second embodiment of the foam fire-extinguishing agent mixing system according to the present invention. In the figure, parts corresponding to those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description of the parts corresponding to those in the first embodiment is omitted.

  In this example, the motor 3b of the water pump 3 is provided in the pressure setting means 18 for setting the water pressure in the primary water pipe 4b of the water orifice 5 and the primary water pipe 4b. It is connected to the pressure sensor 13 via the signal line 19, and the output of the pressure sensor 13 is used as an input so that the pressure of the water 1 in the primary side water pipe 4 b becomes the pressure set by the pressure setting means 18. An inverter control circuit 20 that controls the rotational speed of the pump 3, that is, the rotational speed of the motor 3b is provided. The pressure setting means 18 inputs an arbitrarily set pressure to the inverter control circuit 20, and the configuration thereof is not particularly limited. Since the other configuration is the same as that of the first embodiment, the description of the first embodiment is incorporated.

  In the foam extinguishing agent mixing system of the second embodiment configured as described above, when the pressure of the water in the primary water pipe 4 b is set by the pressure setting means 18, the pressure in the primary water pipe 4 b from the pressure sensor 13 is set. The inverter control circuit 20 to which the pressure of the water 1 is inputted rotates the pump 3 for water so that the pressure inputted by the pressure setting means 18 and the pressure of the water 1 in the primary side water pipe 4b coincide. The number, that is, the rotation number of the motor 3b is controlled.

  In this way, by setting the pressure of the water in the primary side water pipe 4b by the pressure setting means 18, the necessary water discharge amount can be easily obtained, and the primary side water can be determined according to the fire extinguishing situation or the like. By changing the pressure of the water in the pipe 4b, the water discharge amount can be controlled immediately. Even if the pressure of the water in the primary water pipe 4b is changed in this way, the pressure of the water 1 in the primary water pipe 4b and the primary foam extinguishing chemical pipe 9b from the pressure sensors 13, 14 are changed. By the inverter control circuit 17 to which the pressure of the foam extinguishing agent 6 inside is input, the pressure of the water 1 in the primary side water piping 4b coincides with the pressure of the foam extinguishing agent 6 in the primary side foam extinguishing agent piping 9b. In this way, the rotation speed of the foam extinguishing agent pump 8, that is, the rotation speed of the motor 8 b is controlled, so that the foam extinguishing agent 6 has the same pressure as the water 1 in the water pipe 4 b on the primary side of the water orifice 5. Can be fed into the foam-extinguishing agent pipe 9b on the primary side of the foam-extinguishing agent orifice 10, and the liquid mixture of the water 1 and the foam-extinguishing agent 6 mixed at a predetermined ratio can always be discharged from the discharge part 12. . Since other effects are the same as those of the first embodiment, the description of the first embodiment is incorporated.

  FIG. 3 is a schematic explanatory view showing the configuration of a third embodiment of the foam fire-extinguishing agent mixing system according to the present invention. In the figure, the same reference numerals are given to the portions corresponding to the second embodiment shown in FIG. 2, and the description of the configuration corresponding to the second embodiment is omitted.

  In this example, the foam extinguishing agent 6 is accommodated in the foam extinguishing agent piping 9b on the primary side of the foam extinguishing agent orifice 10 on the downstream side of the pressure sensor 14 provided in the foam extinguishing agent piping 9b. A circulation bypass pipe 21 communicating with the foam extinguishing agent tank 7 is connected.

  Further, the primary side foam extinguishing agent pipe 9b has a test valve which is closed during a test operation and opened during a normal operation between a position where the foam extinguishing agent orifice 10 is provided and a position where the circulation bypass pipe 21 is connected. 22 is provided, and the circulation bypass pipe 21 is provided with a test valve 23 that opens during a test operation and closes during a normal operation. In the test valves 22 and 23, solenoid valves are used in this example, and the test valves 22 and 23 composed of solenoid valves are used for testing the operation of this example via the test valve control wiring 24. The operation control circuit 25 for switching between the operation mode and the normal operation mode is connected. When the operation control circuit 25 switches between the test operation mode and the normal operation mode, the test valves 22 and 23 are automatically connected to the operation mode. It opens and closes.

  In the opening / closing operation of the test valves 22 and 23, the test valves 22 and 23 may be manually opened and closed as described above during the test operation and the normal operation. Since the other configuration is the same as that of the second embodiment, the description of the second embodiment is cited.

  In the foam extinguishing agent mixing system of the third embodiment configured as described above, the function inspection of the pressure sensors 13, 14, the inverter control circuits 17, 20, the water pump 3, the foam extinguishing agent pump 8, etc. For this purpose, the test operation is performed as follows.

  The test operation is performed by closing the test valve 22 provided in the primary foam extinguishing agent pipe 9b and opening the test valve 23 provided in the circulation bypass pipe 21.

  During operation, the water 1 is pumped to the water pipe 4 by the water pump 3, the foam fire-extinguishing agent 6 is pumped to the foam fire-extinguishing agent pipe 9 by the foam-extinguishing agent pump 8, and the water Pressure sensors 13 and 14 provided on the primary side water pipe 4b of the orifice 5 for the water and the foam side fire extinguishing chemical pipe 9b on the primary side of the foam 10 are the water 1 And the pressure of the foam fire extinguishing agent 6 in the primary side foam extinguishing agent pipe 9b are detected, and the respective pressures are input to the inverter control circuit 17 via the signal lines 15 and 16, and the water on the primary side The inverter control circuit 17 to which the pressure of the water 1 in the pipe 4b and the pressure of the foam fire extinguishing agent 6 in the primary side foam extinguishing agent pipe 9b are input is the pressure of the water 1 in the primary side water piping 4b and the primary side. Of foam extinguishing agent 6 in the foam extinguishing agent piping 9b The rotational speed of the foam extinguishing agent pump 8, that is, the rotational speed of the motor 8 b is controlled so that the forces coincide with each other, so that the pressure is the same as the pressure of the water 1 in the water pipe 4 b on the primary side of the water orifice 5. The foam extinguishing agent 6 is normally fed into the foam extinguishing agent piping 9b on the primary side of the foam extinguishing agent orifice 10, that is, the pressure sensors 13, 14 and the inverter control circuits 17, 20 Inspect whether water pump 3, foam extinguishing agent pump 8, etc. are functioning normally.

  Since the test operation is performed by closing the test valve 22 provided in the primary foam extinguishing agent pipe 9b and opening the test valve 23 provided in the circulation bypass pipe 21 as described above, the foam extinguishing agent is operated. The foam fire extinguishing agent 6 sent out from the tank 7 to the primary foam extinguishing agent pipe 9b flows to the circulation bypass pipe 21 before the foam extinguishing agent orifice 10, and is returned to the foam extinguishing agent tank 7, where the foam extinguishing agent is fired. The medicine tank 7, the primary-side foam fire-extinguishing medicine pipe 9 b, and the circulation bypass pipe 21 are circulated.

  As a result, the water 1 and the foam fire-extinguishing agent 6 do not come into contact with each other, and it is possible to eliminate the generation of the aqueous foam solution that must be disposed of in the industry, which has been a great effort and cost in the conventional test operation. It is possible to eliminate unnecessary consumption of fire extinguishing agents.

  In addition, although this example is implemented based on 2nd Example, it can implement also based on 1st Example.

It is a schematic explanatory drawing which shows the structure of 1st Example of the foam fire-extinguishing agent mixing system which concerns on this invention. It is a schematic explanatory drawing which shows the structure of 2nd Example of the foam fire-extinguishing agent mixing system which concerns on this invention. It is a schematic explanatory drawing which shows the structure of 3rd Example of the foam fire-extinguishing agent mixing system which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water 2 Water source tank 3 Water pump 3a Pumping mechanism 3b Motor 4 Water piping 4a Secondary side water piping 4b Primary side water piping 5 Water orifice 6 Foam extinguishing agent 7 Foam extinguishing agent tank 8 Foam extinguishing agent Pump 8a pumping mechanism 8b motor 9 foam extinguishing agent piping 9a secondary side foam extinguishing agent piping 9b primary side foam extinguishing agent piping 10 foam extinguishing agent orifice 11 mixing piping 12 discharge part 13, 14 pressure sensor 15, 16 Signal line 17 Inverter control circuit 18 Pressure setting means 19 Signal line 20 Inverter control circuit 21 Circulation bypass pipe 22, 23 Test valve 24 Test valve control wiring 25 Operation control circuit

Claims (3)

An orifice is provided in each of the water pipe into which water is fed by the water pump and the foam fire extinguishing chemical pipe to which the foam is extinguished by the pump for the foam, and the pressure on the primary side of each orifice and the foam extinguishing A foam fire-extinguishing chemical mixing system in which the pressure of the chemical is controlled to be equal, and the water and the foam fire-extinguishing chemical passing through each orifice are mixed and sent out by a mixing pipe,
Pressure sensors are respectively provided in the water piping and the foam fire-extinguishing chemical piping of the respective orifices, and the foam fire-extinguishing chemical pump receives the output of each pressure sensor as an input and the pressure of the primary water A foam fire-extinguishing agent mixing system comprising an inverter control circuit that controls the rotation speed of the foam fire-extinguishing agent pump so that the pressures of the foam extinguishing agent on the primary side coincide with each other.   The water pump has a pressure setting means for setting the pressure of the primary side water, and an output of the pressure sensor provided in the water pipe on the primary side of the orifice as an input. The foam extinguishing agent mixing system according to claim 1, further comprising an inverter control circuit that controls a rotation speed of the water pump so that the pressure becomes a pressure set by the pressure setting means.   A circulation bypass pipe that is located downstream of the pressure sensor provided in the foam fire-extinguishing chemical pipe and communicates with a foam fire-extinguishing chemical tank that accommodates the foam extinguishing chemical is provided in the foam extinguishing chemical piping on the primary side of the orifice. The foam extinguishing agent pipe connected between the orifice and the circulation bypass pipe is provided with a test valve that is closed during the test operation and opened during the normal operation, and the circulation bypass pipe is opened during the test operation. The foam extinguishing agent mixing system according to claim 1 or 2, further comprising a test valve that is closed during normal operation.

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