Pressurized 1.2 MPa suspended dry powder fire extinguishing system

Product Overview of the 1.2 MPa Pressurized Suspended Dry Powder Fire Extinguishing System

I. Overview 

FZX-ACTX/1.2 - ZY The suspended-type dry‑powder fire‑extinguishing device (hereinafter referred to as the “fire‑extinguishing device”) is a next‑generation, highly efficient and environmentally friendly firefighting product. It is charged with… ABC Ultra-fine dry powder extinguishing agent is non-toxic and harmless, does not corrode protected materials, is non-irritating to human skin and respiratory tract, and delivers rapid, highly efficient fire suppression. 

This fire‑extinguishing device features a simple structure, reliable performance, and convenient installation and maintenance. It can be used for total flooding in enclosed spaces as well as for localized suppression in open areas, making it an ideal automatic fire‑extinguishing system for hazardous environments such as urban utility tunnels, industrial and mining facilities, power plants, substations, and petrochemical plants. 

Standards for the manufacture and testing of fire-extinguishing devices GA602-2013 The “Dry Powder Fire Extinguishing System” is being carried out. 

II. Scope of Application 

1 .   Firefighting A Class A fires: such as fires involving combustible solids like cotton, wood, hemp, paper, rubber, plastics, and tobacco. 

2 .   Firefighting B Class A fires: such as fires involving flammable liquids like crude oil, heavy oil, diesel, gasoline, and organic solvents, as well as combustible solids that can melt. 

3 .   Firefighting C Class C fires: such as fires involving flammable gases like coal gas, natural gas, acetylene, and others. 

4 .   Firefighting E Class A fires: such as fires involving energized equipment in computer rooms, substations, cable tunnels, cable trenches, and power compartments within urban utility tunnels. 

This device is not suitable for extinguishing fires involving the following substances: 

1.  Chemical substances such as nitrocellulose, explosives, nitrogen oxides, and fluorine, which can undergo oxidation reactions even in the absence of air, together with oxidizing agents; 

2.  Reactive metals such as potassium, sodium, magnesium, titanium, and zirconium, as well as their hydrides. 

Three .  Composition of the fire suppression system 

1 The fire-extinguishing system primarily consists of a powder storage tank, nozzles, a pressure indicator, a heat‑sensitive glass bulb, and suspension rings, among other components. 

2 , Filling inside the powder tank ABC Ultra-fine dry powder extinguishing agent, with nitrogen as the propellant gas. 

4. Model and Main Performance Parameters 

1 , Model and Main Performance Parameters Table ( 1 ) 

2 , Model and Main Performance Parameters Table ( 2 ) 

Five . Working principle 

1 , Fire-extinguishing principle 

When a fire occurs, the heat‑sensitive glass bulb of the fire‑extinguishing device expands and shatters upon heating, releasing ultra‑fine dry powder under driving pressure. 1.2MPa Under the action of high-purity nitrogen, the powder is thoroughly mixed to form a gas–powder mixture that is discharged; the atomized powder comes into contact with the flame and, through chemical and physical mechanisms, extinguishes the fire. Ultrafine dry powder exhibits chemical inhibition for flaming combustion, asphyxiation for non‑flaming combustion, and shielding and cooling effects against thermal radiation. The particle size of ultrafine dry powder is small ( 20 mu m Furthermore, it exhibits excellent fluidity and can remain suspended in the air for a certain period of time; therefore, it is suitable for localized fire suppression in open spaces as well as total flooding fire suppression in enclosed spaces. 

2、 Fire suppression system activation methods 

The device is simple and reliable to operate, offering three control modes: manual, system‑interlocked, and temperature‑controlled start. 

( 1 ) Manual start 

When the fire suppression control panel is set to the “Manual” position, the fire suppression system operates in manual mode. In the event of a fire in the protected area, manually pressing the start button on the fire suppression control panel or the manual control panel will activate the system to discharge the extinguishing agent and suppress the fire. 

After the point-type fire detector of the fire suppression system is powered on, it triggers the breakage of the glass bulb, activating the sprinkler head to discharge the extinguishing agent and suppress the fire. 

After the fire suppression control panel issues a start command, or after the start button is manually pressed, during the set delay period… 30s During this period, if personnel determine that no fire has occurred or that the fire has already been extinguished, they may press the emergency stop button to halt the activation of the fire suppression system. 

( 2 ) System Integration (Automatic Startup) 

When the fire suppression controller is set to the “Automatic” position, the fire suppression system operates in automatic control mode. Upon detection of a fire in the protected area, the fire suppression controller initiates an audible and visual alarm to alert personnel within the zone to evacuate, after which the controller proceeds to… 30 S After a delay, the system automatically supplies power to the igniter on the fire‑extinguishing device. Once the igniter is energized, it triggers the glass bulb to break, opening the sprinkler head and releasing the extinguishing agent to suppress the fire. 

( 3 ) Temperature-controlled startup 

When a fire breaks out in the protected area and the ambient temperature rises to the nominal operating temperature of the heat‑sensitive element, the heat‑sensitive liquid inside the glass bulb expands, causing the bulb to shatter and activating the sprinkler head to discharge the extinguishing agent. Regardless of whether the fire alarm control panel issues a fire‑extinguishing command, the fire‑suppression system automatically initiates operation to suppress the fire. 

Six . Application of Fire Extinguishing Systems 

1  The fire suppression system is suitable for both total flooding and local application fire suppression. 

2  During total flooding fire suppression, calculations shall be performed based on the conditions and dimensions of the protected space or object to select an appropriately sized extinguishing device, which shall be evenly distributed and suspended above the protected area. 

3  When applying fire suppression locally, select a fire‑extinguishing device of appropriate size based on the dimensions of the protected object, and suspend it above the object to ensure that, during discharge, the extinguishing agent fully covers the protected material. 

4   Install in a protected zone. 3 When there are fewer than a certain number of fire-extinguishing devices, only the temperature‑controlled activation method may be used for startup. If installed… 3 When there are more than one fire-extinguishing device, an electric‑control start-up method shall be employed. In this electric‑control start-up system, a temperature‑controlled start-up mode is also incorporated. 

Seven . Fire suppression system installation 

( 1 ) Suspended dry powder fire extinguishing system Installation and Usage Instructions 

1 • During product transportation, handling, and storage, dropping and rough loading/unloading are strictly prohibited. 

2 The fire suppression system must not be serviced while energized. If maintenance is required, the system’s power supply must be disconnected, and the system’s activation circuit must be shorted. 

3 , The safety current for the electric start of the fire-extinguishing system shall not exceed 150 mA ;

4 , Task testing is prohibited without the authorization of the manufacturer’s representative; 

5 , Verify that the internal supply components are complete in the inspection report; 

6 , Check whether the device leads are shorted; 

( 2 ) Suspended dry powder fire extinguishing system Installation method 

1.  There are two installation methods for fire suppression systems: 

1 ). Insert the expansion screw with a hook ( M12 ) Secure it to the precast concrete slab above the protected area, then hook the lifting ring at the top of the fire suppression device onto the bent portion of the expansion anchor. As shown in the figure. 

( 3 ) Suspended dry powder fire extinguishing system Wiring method 

1 , Start-up line connection 

To parallel the start-up lines, it is necessary to add 24V The power supply meets the starting current requirements of the fire suppression devices within the protected area. 

2 , Feedback line connection 

Within a single protection zone, all feedback lines are connected in parallel and then linked to the feedback signal terminals of the gas fire‑extinguishing control panel. 

3 , Electrical Starting Wiring Diagram: 

1、2 The foot switch serves as the start button and is connected to the start terminal of the gas fire‑extinguishing control panel. The start terminal of the gas fire‑extinguishing control panel must provide… DC24V Voltage, current >1A , only then can the fire suppression system operate. 3、4 The pin is a feedback pin, and the feedback signal is passive.