I. System Implementation Standards:

IG100 Fire suppression system components are manufactured in accordance with the GB 25972-2010 standard.

II. System Overview

Extinguishing agent:

  The IG100 fire suppression system uses pure nitrogen, which is entirely derived from the atmosphere—the primary constituent of air—and has no adverse impact on the atmospheric ozone layer. It works by reducing the oxygen concentration in the combustion zone to below the level required to sustain combustion, thereby achieving smothering and extinguishing the fire; this is a physical method of fire suppression.

III. Scope of Application:

IG100 Fire suppression system The fire suppression system can extinguish the following types of fires: 

1. Gas fires (power must be disconnected during firefighting)
2. Fires involving liquids and liquefiable solids
3. Solid surface fires and deep-seated fires in certain solids such as cotton, wool, fabrics, and paper.
4. Electrical fire

The IG100 fire suppression system shall not be used to extinguish fires involving the following substances:

1. Nitrocellulose and gunpowder
2. Fires involving reactive metals such as potassium, sodium, magnesium, titanium, and zirconium
3. Metal hydride
4. Chemical products that can decompose on their own 

Typical protective facilities:

    Gas fire suppression systems are primarily suitable for fire protection in critical facilities such as computer rooms, libraries, archives, vaults storing valuable items, power stations, telecommunications centers, and cleanrooms.

IV. Main Technical Parameters:

Fire extinguishing method

Storage pressure: 15 MPa

Maximum working pressure of the cylinder: 17.2 Pa

Fire extinguisher specifications: 80L, 90L

System start-up modes: automatic, manual, and mechanical emergency start-up.

Starting cylinder filling pressure: 6.0 MPa

Starting method and power of the starter bottle: electromagnetic start; DC 24 V, 1.8 A.

V. System Composition

The IG100 fire suppression system consists of steel cylinders, container valves, manifold assemblies, high-pressure hoses, liquid check valves, selection valves, signal feedback devices, safety relief valves, low‑leakage high‑seal valves, actuating devices, gas check valves, piping and fittings, nozzles, cylinder racks, and pneumatic copper tubing, among other components.

Specifically, the system is further classified into unit‑independent systems and combined distribution systems.

5.1. Unit-Independent System:

A system consisting of one or more fire extinguisher cylinders, which protects a designated protected area via fixed piping and nozzles.

A standalone system is suitable for a single, independent fire‑hazard zone or for areas with special requirements. When the protected zone is monitored by smoke and heat detectors and a fire alarm is confirmed, the fire alarm control panel issues an alarm signal to alert personnel to evacuate, shuts down linked equipment, and sends a fire‑extinguishing command. This immediately opens the cylinder solenoid valve, activating the extinguishing cylinder; the extinguishing agent is then conveyed through piping to the nozzles, where it is discharged into the protected area to suppress the fire.              

   5.2. Combined Distribution System:

It is a system composed of one or more fire-extinguishing cylinders, which, via a selection valve and fixed piping and nozzles, provides protection to two or more protected zones. A single fire-extinguishing system may protect no more than eight protected zones.

The combined distribution system is the most common configuration in fire suppression system design. It is characterized by using a minimal amount of extinguishing agent to protect multiple hazard zones, offering advantages such as low cost and a small footprint. The quantity of extinguishing agent is determined based on the demand of the largest protected zone.

When a fire occurs in one of the protected zones, smoke and heat detectors confirm the alarm. The fire alarm control panel then issues an alarm signal to evacuate personnel, shuts down linked equipment, and sends a fire‑extinguishing command. Immediately, the solenoid valve on the initiating cylinder for the affected zone opens, allowing nitrogen to flow through the initiating pipeline. This nitrogen subsequently activates the selection valve and the cylinder‑head valve of the corresponding zone, enabling the extinguishing agent stored in the associated cylinder to be rapidly discharged—via the cylinder‑head valve, manifold, selection valve, and delivery piping—to the nozzles, thereby suppressing the fire.

Figure 2 Schematic diagram of the combined distribution system 

In the figure: 1. Spray nozzle 2. Fire detector 3. Pressure switch

4. Safety valve 5. Selective valve 6. Check valve

7. IG100 Fire Extinguisher Cylinder Assembly   8. Electromagnetic Starter 9. Starting Gas Cylinder

10. Alarm Control Panel 11. Spray Indicator Light 12. Emergency Start/Stop Button

13. Audio-visual alarm

VI. Main Components of the Fire Suppression System:

1. Extinguishing agent cylinder:

Model: DMP15/80, DMP15/90

    The fire‑extinguishing agent cylinder is a container for storing the extinguishing agent, consisting of an extinguishing steel cylinder and a cylinder valve. When fire suppression is required, the cylinder valve can be opened via pneumatic actuation to release the extinguishing agent and suppress the fire. The extinguishing agent cylinder is a seamless gas cylinder and complies with the relevant provisions of National Standard GB 5099.

The main technical parameters and external dimensions of the fire-extinguishing agent cylinder are as follows:

Cylinder capacity: 80L, 90L

Ambient temperature: 0–50°C

Storage pressure: 15 MPa

Maximum working pressure: 17.2 MPa

2. Container Valve: HRF14/17.2

The container valve is mounted on the fire-extinguishing cylinder. It allows extinguishing agent to be charged into the cylinder and seals the agent to prevent leakage. When fire suppression is required, the container valve is opened to discharge the extinguishing agent and extinguish the fire.

The main technical parameters are as follows:

Working pressure: 17.2 MPa

Hydraulic strength test: 25.8 MPa

Air-tightness test: 17.2 MPa

3. Liquid Check Valve: HYD14/17.2

   The liquid check valve is installed between the manifold and the metal hose to prevent extinguishing agent from backflowing from the manifold into unactivated extinguisher cylinders. When an extinguisher cylinder is replaced, this does not affect the operation of the other cylinders.

The main technical parameters are as follows:

Working pressure: 17.2 MPa

Hydraulic strength test: 25.8 MPa

Air-tightness test: 17.2 MPa

Minimum opening pressure: ≤0.2 MPa

  4. High-pressure metal hose: HRG15/17.2

   High-pressure metal hoses are used to connect container valves to manifold pipes, providing a flexible joint that mitigates vibration caused by the release of extinguishing agent and facilitating the removal and installation of cylinders.

The main technical parameters are as follows:

Nominal pressure: 17.2 MPa

Hydraulic strength test: 25.8 MPa

Air-tightness test: 17.2 MPa

Minimum bending radius: 140 mm

5. Collector pipe: DJG40/17.2

  The manifold is mounted on the cylinder rack; the extinguishing agent from each fire-extinguishing cylinder converges into the manifold and is then conveyed to the protected area via the corresponding selection valves and piping network.

6. Cylinder Rack: DPJ

   Used to secure the fire-extinguishing agent cylinder and the manifold, preventing vibration during discharge.

7. Selection Valve: XZ40/17.2

Selection valves are used in combined distribution systems to control the flow direction of the extinguishing agent. They remain closed under normal conditions and, upon activation during a fire, open to allow the extinguishing agent to be discharged into the affected protected zone, thereby achieving fire suppression.

The main technical parameters are as follows:

Nominal pressure: 17.2 MPa

8. Pneumatic Check Valve: HQD6/6.6

   The pneumatic check valve is installed on the actuation line to control the direction of airflow, thereby enabling the selection of the corresponding isolation valves for each protected zone.

The main technical parameters are as follows:

Nominal pressure: 6.6 MPa

Strength test: 9.9 MPa

Minimum opening pressure: ≤0.08 MPa

9. Actuating gas container valve, electromagnetic actuator: HRF6/6.6, HDQ90N

The initiating cylinder is charged with nitrogen and fitted at its outlet with an initiating valve and an electromagnetic actuator. In the event of a fire, the cylinder’s actuation plate outputs a 24 V DC signal, energizing the electromagnetic actuator to open the initiating valve. This releases high‑pressure nitrogen from the initiating cylinder, which travels through the control piping to open the corresponding selection valve and the associated extinguishing‑agent cylinder’s head valve, thereby discharging the extinguishing agent into the protected area to suppress the fire. In an emergency, the manual safety pin may also be removed and the initiating valve can be activated by striking it.

The main technical parameters are as follows:

10. Signal Feedback Device: XF0.6/17.2

The signal feedback device is a pressure switch installed at the outlet of the selection valve or on the fire‑extinguishing pipeline. When the extinguishing agent is discharged, the pressure in the pipeline rises, activating the pressure switch and sending a signal to the fire‑extinguishing control system, which in turn energizes the extinguishing‑agent release indicator to alert personnel.

The main technical parameters are as follows:

Working pressure: 17.2 MPa

Actuation pressure: 0.6 ± 0.06 MPa

Connection size: R1/4″

Contact rating: DC 24 V, 0.5 A

11. Low-leakage, high-seal valve: DG0.3/17.2

The low-pressure relief valve is installed on the pneumatic control line and remains open under normal conditions. When there is a leak in the initiating cylinder, the escaping gas is discharged to the atmosphere through this valve, preventing the buildup of high pressure in the control line that could cause unintended system operation. Upon activation, gas from the initiating cylinder is charged into the control line; as the line pressure rises rapidly, the low-pressure relief valve immediately closes, ensuring that the high‑pressure gas in the control line is directed to open the corresponding valves. . 

The main technical parameters are as follows:

Nominal pressure: 6.6 MPa

Operating pressure: ≥0.3 MPa

12. Nozzle: HPT37#-32

The nozzle is installed at the end of the fire‑extinguishing delivery piping network to regulate the discharge rate of the extinguishing agent, ensuring rapid vaporization and uniform distribution throughout the protected area.

The main technical parameters and external dimensions are as follows:

13. Safety valve: HAX23

Installed at one end of the manifold, it features a rupture disc that bursts when the pressure in the pipeline exceeds the allowable limit, thereby providing safe pressure relief.

Main performance parameters: The burst pressure of the safety membrane is 23 ± 1.15 MPa.

14. Pressure-reducing device: DJYB19-40

VII. Control Method:

The IG100 gas fire suppression system features three activation modes: automatic, manual, and mechanical emergency start.

1. Automatic activation—fire detection and alarm, shutdown of linked devices, and discharge of the extinguishing agent are all performed automatically by the system, eliminating the need for manual intervention or operator control.
2. Manual activation—after personnel receive a fire alarm signal and confirm its validity, they activate the manual start button, triggering the controller to discharge the extinguishing agent.
3. Mechanical Emergency Activation — When both automatic and manual operations fail, personnel activate the system’s mechanical start-up mechanism to directly operate the equipment and release the extinguishing agent.

VIII. System Usage 

☆Action Procedure 

☆ Operating Method

Automatic control

In normal operation, the gas fire‑extinguishing controller is set to the “Automatic” mode, placing the system in automatic control. When a fire occurs in the protected area, the fire detectors issue an alarm signal, and the fire alarm control panel (or the gas fire‑extinguishing controller) simultaneously activates audible and visual alarms and issues interlock commands to shut down ventilation equipment such as air conditioners, fans, and fire‑rated rolling shutters. After a 30‑second delay—during which personnel within the protected zone must evacuate promptly—the controller outputs a 24 V DC, 1.8 A extinguishing‑power signal to energize the initiating cylinder’s solenoid actuator. The released control gas then opens the corresponding release valve in the designated zone, which in turn opens the container valve on the extinguishing‑agent storage cylinder, allowing the agent to be discharged and the fire to be extinguished.

Manual control

When personnel are working or on duty in the protected area, set the control mode to “Manual”; the fire suppression system will then operate in manual control. If a fire occurs in a particular protected area, pressing the “Start” button on the fire alarm and suppression control panel (or the gas‑extinguishing control panel) will initiate the system according to the automatic sequence and carry out fire suppression. Alternatively, once it has been confirmed that all personnel have evacuated, pressing the “Emergency Start” button installed at the entrance of that zone will immediately activate the system in automatic mode and release the extinguishing agent to suppress the fire.

When a fire alarm is triggered, if it is determined within the delay period that activation of the fire suppression system is not required, pressing the “Emergency Stop” button on the gas fire suppression control panel or outside the protected zone door will terminate the extinguishing sequence.

Mechanical Emergency Start: If both of the aforementioned start-up methods fail, the safety pin of the solenoid valve on the corresponding zone’s initiating cylinder may be manually pulled, and the solenoid valve can be activated by hand to initiate a mechanical emergency start and carry out fire suppression.

IG100 Gas Fire Suppression System – Frequently Asked Questions

Q: What types of facilities are suitable for the IG100 gas fire suppression system?  

A: Suitable for computer rooms, archives, electrical distribution rooms, and storage facilities for valuable equipment; it can extinguish Class A, Class B, and Class C fires, as well as energized electrical fires.

Q: What is the composition of IG100 fire suppressant?  

A: IG100 fire suppressant is nitrogen with a purity of 99.9% or higher. It is a single inert gas that is clean, environmentally friendly, and poses no risk of ozone depletion.

Q: What are the activation methods for the IG100 system?

A: It features three activation modes—automatic, manual, and mechanical emergency—and can be connected to a fire alarm control panel, with discharge triggered in coordination with smoke and heat detectors.

Q: What is the fire-extinguishing principle of IG100?

A: By releasing high-purity nitrogen into the protected area, the oxygen concentration in the space is reduced, preventing combustion from sustaining and achieving physical smothering extinguishment.

Q: What are the key considerations during system installation and construction?  

A: The cylinder assembly is installed in a dedicated cylinder room; the piping system has undergone a leak‑tightness pressure test; the protected area is equipped with automatic pressure relief vents in accordance with relevant standards; and the nozzles are arranged appropriately.

Q: What items should be checked during routine inspections and maintenance?

A: Regularly inspect the cylinder pressure gauge, cylinder valve, and pipeline fittings for leaks; test the alarm‑interlock devices; and check the cylinder body for rust or deformation.

Q: What impact does the discharge of IG‑100 have on personnel within the protected area?

A: Prior to discharge, an audible and visual alarm will be activated, and personnel must evacuate promptly. After discharge, the oxygen level in the protected area will be low; entry is permitted only after thorough ventilation.

Q: Will IG100 damage precision electronic equipment?

A: Pure nitrogen is non-corrosive, leaves no residue, and is non-conductive, ensuring it will not contaminate or damage precision instruments, servers, or optical equipment.

Q: Can the agent be refilled on-site after it has been discharged?

A: On-site refilling is not permitted. After discharge, the cylinders must be transported back to a qualified fire‑safety organization for inspection and subsequent recharging with high‑purity nitrogen.

Q: Does the IG100 system meet the acceptance requirements for fire protection projects?

A: The product is accompanied by a fire‑safety inspection report and complies with relevant gas‑extinguishing standards. Upon completion of installation and commissioning, it can be integrated with the protected area to facilitate overall fire‑safety acceptance.