Design of automatic tracking and positioning jet fire extinguishing system
General Provisions
The automatic tracking and positioning jet fire extinguishing system should be as composed of a fire extinguishing device, detection device, control device, water flow indicator, simulated terminal water test device, and other components, as well as pipelines and valves, water supply facilities, etc.
The layout of fire extinguishing devices shall be reasonably as determined according to the building conditions such as the clearance height and plane layout of the installation site.
The water supply pipeline design of the automatic tracking and positioning jet fire extinguishing system shall meet the following requirements:
1. A wet pipeline should be as used before the automatic control valve;
2. Antifreeze measures should be taken in places where freezing may occur;
3. The length of the dry pipeline behind the automatic control valve should not be greater than 30m.
Design Parameters
For automatic fire monitors and spray-type automatic jet fire extinguishing devices within their protection radius, the jet stream of one fire extinguishing device can effectively extinguish a 1A fire extinguishing level within 3 minutes. If two automatic fire monitors or spray-type automatic jet fire extinguishing devices are as used to extinguish the fire simultaneously from two different directions, the fire extinguishing effect will be better.
The automatic fire monitor fire extinguishing system is mainly as used to extinguish Class A fires (solid material fires) in tall and large spaces in buildings. The flow selection of an automatic fire monitor is an important parameter of system design, and it is very important to ensure the reliability and safety of system fire extinguishing. This article stipulates that the automatic fire monitor fire extinguishing system used to extinguish fires in civil buildings requires that the flow rate of a single monitor should not be less than 20L/s to ensure the fire water volume and fire extinguishing intensity of the system.
According to the provisions of this standard, the design flow of the system is the total flow of two fire monitors when the jets are as turned on at the same time, that is, it should not be less than 40L/s. Considering that the fire load of industrial buildings is relatively large, it is necessary to increase the flow rate of a single fire monitor to increase the fire extinguishing intensity. Therefore, it is as stipulated that the flow rate of a single monitor for automatic fire extinguishing systems used to extinguish fires in industrial buildings. And it should not exceed Less than 30L/s, that is, the design flow rate of the system should not be less than 60L/s.
The spray-type automatic jet fire extinguishing system detects the fire point through the detection device. And automatically turns on the corresponding fire extinguishing device to spray the fire, which has the functions of accurately locating the fire source, quickly extinguishing the fire, and suppressing the fire.
System Components
1. The fire extinguishing device should meet the anti-corrosion requirements of the corresponding use environment and medium, and should meet the following regulations:
①The pitching and horizontal rotation angles of automatic fire monitors and spray-type automatic jet fire extinguishing devices shall meet the requirements for use;
② The automatic fire monitor should have the conversion function of DC-spray.
The performance parameters of automatic fire monitor, spray type automatic jet fire extinguishing device and spray type automatic jet fire extinguishing device shall meet the following table:
NO.1 Performance parameters of automatic fire monitor
| Rated working pressure upper limit（MPa） | Maximum protection radius at rated working pressure（m） | positioning time（s） | Minimum installation height（m） | Maximum installation height（m） |
| 1.0 | 42 | ≤60 | 8 | 35 |
| 50 | ||||
| 52 | ||||
| 55 |
NO.2 Performance parameters of spray type automatic jet fire extinguishing device
| Limited Data（L/s） | Rated working pressure upper limit（MPa） | Maximum protection radius at rated working pressure（m） | positioning time（s） | Minimum installation height（m） | Maximum installation height（m） |
| 5 | 0.8 | 20 | ≤30 | 8 | 20 |
| 10 | 28 | 25 |
NO.3 Performance parameters of sprinkler type automatic jet fire extinguishing device
| Limited Data（L/s） | Rated working pressure upper limit（MPa） | Maximum protection radius at rated working pressure（m） | Positioning time（s） | Minimum installation height（m） | Maximum installation height（m） |
| 5 | 0.6 | 6 | ≤30 | 8 | 25 |
| 10 | 7 |
3. The design of the fire extinguishing device installation should meet the following requirements:
① The installation location should meet the requirements for normal use and maintenance of the fire extinguishing device;
② The fixed bracket or installation platform shall be able to meet the spraying and spraying reaction force requirements of the fire extinguishing device, and the structural design shall be able to meet the normal use requirements of the fire extinguishing device.
4. The design of the detection device shall meet the following requirements:
① Composite detection method should be adopted, and it should be able to effectively detect and determine the fire source in the protected area;
②The monitoring radius should match the protection radius or protection range of the corresponding fire extinguishing device;
③The layout of the detection device should ensure that there is no detection blind area in the protected area;
④The detection device should meet the dustproof, waterproof, and anti-interference requirements of the corresponding use environment.
5. The control host and field control box should have the following functions:
① It is necessary to control the horizontal, pitching, and turning movements of the automatic fire monitor or jet-type automatic jet fire extinguishing device, and the transition of the jet state;
② The opening and closing of the automatic control valve shall be as controlled;
③ The fire water pump should be as started remotely, but the fire water pump should not be automatically and remotely as stopped;
④ When the control host is in the automatic control state, it should control the action of the fire extinguishing device according to the set procedure;
⑤ The control host should have status display functions for fire pumps, fire extinguishing devices, automatic control valves, signal valves, and water flow indicators;
⑥ The on-site control box shall have the status display function of fire pumps, automatic control valves, etc.
6. The system should be as equipped with sound and light alarms and should meet the following requirements:
① Sound and light alarms should be evenly as installed in the protected area, which can be used together with the automatic fire alarm system;
② The sound pressure level of sound and light alarms should not be less than 60dB; in places where the ambient noise is greater than 60dB, the sound pressure level should be 15dB higher than the background noise.
7. The water flow indicator shall meet the following requirements:
① The water flow indicator shall be as installed on the water supply branch pipe of each automatic fire monitor, spray type automatic fire extinguishing device, and each group of spray type automatic fire extinguishing devices, and shall be as installed after the outlet of the manual control valve;
② The nominal pressure of the water flow indicator should not be less than 1.2 times the working pressure of the system;
③ The water flow indicator should be installed in a position that is convenient for maintenance. When it is as installed in the ceiling, the ceiling should reserve an inspection hole;
④ The nominal diameter of the water flow indicator should be the same as that of the water supply branch pipe.
Pipes and Valves
1. The water supply pipeline before each fire extinguishing device of the automatic fire monitor fire extinguishing system and the spray type automatic jet fire extinguishing system and each group of fire extinguishing devices of the spray type automatic jet fire extinguishing system should be as arranged in a ring pipe network. The pipe diameter of the annular pipe network shall be as determined according to the corresponding design flow rate.
2. An inspection valve with signal feedback should be as installed on the annular water supply network of the system. The setting of the maintenance valve shall ensure that no more than 5 water supply branch pipes are as affected during pipeline maintenance.
3. Automatic control valves and manual control valves with signal feedback shall be installed on the water supply branch pipes of each automatic fire monitor or spray-type automatic fire extinguishing device, and each group of spray-type automatic fire extinguishing devices. The automatic control valve shall be set near the fire extinguishing device’s imported parts.
4. The opening and closing signals of signal valves and automatic control valves should be as transmitted to the fire control room.
5. Metal pipes such as hot-dip galvanized steel pipes should be as used for indoor and outdoor overhead pipes. The connection of overhead pipelines should adopt grooved connectors (clamps), threads, flanges, clamping, etc., and welding connections should not be as used.
6. Buried pipelines should adopt ductile iron pipes, steel wire mesh skeleton plastic composite pipes, reinforced anti-corrosion steel pipes, and other pipe materials. Reliable anti-corrosion measures should be taken for buried metal pipelines.
7. The valve should be as sealed reliably, and there should be obvious signs of opening and closing.
8. A drain valve or drain should be as installed on the water supply pipe of the system, and an automatic exhaust valve should be as installed at the top of the pipe section where air may be as trapped.
9. The horizontally installed pipeline should have a slope of not less than 1%, and the slope should be towards the drain valve.
10. When pipelines pass through building deformation joints, compensation measures should be taken to absorb deformation.
11. When the pipeline passes through the load-bearing wall, a metal casing should be as installed; when it passes through the outer wall of the basement, waterproof measures should also be taken.
Water Supply
1. The automatic fire monitor fire extinguishing system should be as equipped with an independent fire pump and water supply pipe network, and the spray type automatic jet fire extinguishing system and the spray type automatic jet fire extinguishing system should be as equipped with an independent fire water pump and water supply pipe network.
2. When the spray type automatic jet fire extinguishing system or the spray type automatic jet fire extinguishing system and the automatic sprinkler system
3. When using fire pumps and water supply pipe networks, the following regulations should be met:
① When the two systems work at the same time, the system design water volume, water pressure, and water consumption for primary fire extinguishing shall meet the requirements for the simultaneous use of the two systems;
② When the two systems do not work at the same time, the system design water volume, water pressure, and water consumption for primary fire extinguishing shall meet the requirements of the larger system;
③ The two systems should be able to operate normally without affecting each other.
4. Fire pumps should be as equipped with backup pumps according to the ratio of one use and one standby or two uses and one standby. The working capacity of the standby pump should not be less than the working pump with the largest working capacity.
5. For buildings powered by secondary load, diesel engine pumps should be as used as backup pumps.
6. The fire water pump and the pressure stabilizing pump should adopt the self-priming water absorption method.
7. Each fire pump should be equipped with an independent water suction pipe to absorb water from the fire pool. When it is difficult for each fire pump to absorb water from the fire pool alone, it can be used to absorb water from the water suction main pipe alone. There should be no less than 2 water diversion pipes extending from the main water suction pipe into the fire pool. When one of them is closed, the remaining water diversion pipes should be able to pass all the water.
8. Each group of fire pumps should have no less than 2 outlet pipes connected to the system water supply pipes. When one of the outlet pipes is as closed, the remaining outlet pipes should be able to pass the entire water consumption of the system.
9. A filter, vacuum pressure gauge, and control valve should be as installed on the suction pipe of the fire pump.
10. The outlet pipe of the fire pump should be as equipped with a check valve, a control valve, a pressure gauge, and a water test valve with a nominal diameter of not less than 65mm. The range of the pressure gauge should be 2 to 2.5 times the rated working pressure of the fire pump. When the maximum outlet pressure of the fire pump is greater than 1.0MPa, measures to prevent system overpressure should be taken on the outlet pipe of the fire pump. A flow and pressure detection device should also be as installed on the outlet pipe of the fire pump.
11. The control valves installed on the suction pipes and outlet pipes of the fire pumps should adopt rising stem gate valves or butterfly valves with self-locking devices.The electrical equipment in the fire pump room shall take effective waterproof, moisture-proof, and anti-corrosion measures.
Operation and Control
1. The system should have three control methods: automatic control, manual control in the fire control room, and manual control on site. Manual control in the fire control room and on-site manual control shall have priority over automatic control.
2. Under the automatic control state of the automatic fire monitor fire extinguishing system and the spray type automatic jet fire extinguishing system, when the fire source is as detected, there should be at least 2 fire extinguishing devices to scan and locate the fire source, and there should be at least 1 and a maximum of 2 The fire extinguishing device automatically starts the jet, and the jet should be able to reach the fire source for fire extinguishing.
3. When the sprinkler-type automatic jet fire extinguishing system is under automatic control, when the fire source is as detected, the fire extinguishing device corresponding to the detection device that finds the fire source should automatically open the jet, and the jet of at least one group of fire extinguishing devices should be able to reach the fire source Put out the fire.
4. When the system is in the state of automatic control, the control host should be able to automatically start the fire pump, open the automatic control valve, and start the system jet to extinguish the fire after receiving the fire alarm signal and confirming that the fire has occurred. At the same time, it should start the sound and light alarms and other linkage equipment. When the system is under manual control, the system should be manually as activated to extinguish the fire after the fire has been manually as confirmed.
5. After the system starts automatically, it should be able to extinguish the fire continuously. When the system cannot detect the fire source, the automatic fire extinguishing system, and spray type automatic jet fire extinguishing system should stop spraying after not less than 5 minutes, and the spray type automatic jet fire extinguishing system should stop spraying after not less than 10 minutes. When the fire source is as detected again after the system stops the jet, it should be able to start the jet again to extinguish the fire.
6. The start and stop of the stabilizing pump should be as controlled by the pressure switch. The minimum stabilizing pressure setting of the air pressure stabilizing device shall meet the design working pressure of the fire extinguishing device at the most unfavorable point of the system.