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Gas Fire Suppression Systems

Automatic Gas Fire Suppression Systems are designed for unmanned detecting and extinguishing of class А, В, С fires and live electric equipment.

Gaseous extinguishing agents are used in Gas Fire Suppression Systems: Halons (HFC-125, FM-200, HFC-318); Novec 1230 (FK-5-1-12); CO2 and inert gases.

The complete list of gaseous fire extinguishing agents can be found in SP5.13130.2009 Automatic Fire Alarm and Fire Suppression Systems, Part 8.

Main characteristics of gaseous fire extinguishing agents:


HFC-125
(C2F5H)
HFC-125 – Colorless incombustible non-toxic gas.
HFC-125 has gained wide acceptance in Russia basically because of its low cost. HFC-125 is used in applications aiming to protect locations with no permanent human presence.
Advantages:
  • Low cost
  • High Effectiveness
  • High thermal stability (900°С)
  • Ozone friendly (ozone destruction factor of HFC-125 is zero)
Disadvantages:
  • Human presence is not allowed in an environment with HFC-125 in the air.
  • Low refill coefficient (0.9kg/l)
  • Low dielectric conductance (0.95)

FM-200
(C3F7H)
FM-200 – is clean product compliant with all ecological requirements of Regulations in the field of gaseous fire extinguishing. FM-200 is harmless to health and it features high refill coefficient and dielectric conductance. FM-200 is the best solution in terms of cost-effectiveness and safety.
Advantages:
  • Safe for humans
  • Environmental friendly
  • High refill coefficient (1.1kg/l)
  • Low dielectric conductance (2.0)
Disadvantages:
  • Low safety limit (relative surplus over NOAEL concentration is 25%).

HFC-318
(C4F8)
HFC-318 – is not as common as other halocarbon product; nevertheless, this product also has its customers. HFC-318 is safe for humans and complies with all ecological requirements of Regulations in the field of gaseous fire extinguishing.
Advantages:
  • Safe for humans
  • Environmental friendly
  • High refill coefficient (1.1kg/l)
Disadvantages:
  • High cost
  • Low effectiveness

Novec 1230 (FK-5-1-12)
(CF3CF2C(O)CF(CF3)2)
Novec 1230 (FK-5-1-12) – presently Novec 1230 is the most innovative and environment-friendly fire extinguishing agent featuring the largest margin of safety – 138%.
Advantages :
  • Non-toxic operational concentration and the largest margin of safety for manned spaces
  • Zero ozone destruction factor
  • Short life cycle (exists in atmosphere 3-5 days)
Disadvantages:
  • High cost

CO2
(carbon dioxide)
СО2 is used for protection of Industrial Facilities, Oil and Gas Plants as well as other unmanned applications
Advantages :
  • High-performance extinguishing
  • Low refill costs
  • Effective cooling of surfaces at flame
Disadvantages:
  • No human is allowed in CO2 environment
  • Additional CO2 mass control devices are needed

There different kinds of gaseous extinguishing agents; and their features differ, though extinguishing properties are very alike. When choosing right agent for a specific project the following criteria are to be considered: type of protected space, safety issues, environmental issues and cost-effectiveness

Comparison table :

Agent Use concentration, % NOAEL2 % Safety margin
Global Warming
Potential
Atmospheric
Lifetime, years
HFC-125 9,8 7,5 -23% 3 500 34,2
FM-200 7,2 9 25% 3 220 29
HFC-318 7,8 9 15% 9 100 35
FK-5-1-12

(Novec 1230)

4,2 10 138% 1 3-5 days
СО2 (carbon dioxide) 34,9 5 -85% 1

Use concentration – concentration of agent that creates non-combustion environment

NOAEL – (no-observed-adverse-effect level) – the highest agent concentration that is without adverse effect

Margin of safetyс   – relative surplus of NOAEL over inerting concentration

Cylinders are filled with agent at special-purpose refill stations. Agent is stored under the pressure of replacement gas – normally nitrogen is used for Novec 1230 systems. CO2 is stored under the pressure of its own vapors

Gas Fire Suppression Cylinder includes high-pressure container, a lock unit, siphon and actuator device.

Cylinders design allows combining them into a pile to use jointly. In this case, the first cylinder (pilot cylinder) is actuated from the firefighting control station, and all the others are actuated with pneumatic pressure in start manifold after the pilot cylinder has triggered.

Depending on the volume of agent and system design Gas Fire Suppression Systems can be one-directional and multi-directional.

Gas Fire Suppression System consists of two parts:

1.
Mechanical part.

The mechanical part includes the following devices:

  • Cylinder (pile of cylinders) with agent;
  • High-pressure hose;
  • Check valve – for preventing entering agent from manifold into adjacent cylinders;
  • High-pressure manifold;
  • Pressure annunciator
  • Distribution headers
  • Distributing manifold
  • Nozzles
  • Blinds, adaptors and test device
  • Pressure relieve valve
  • Smoke suction device

When an alarm goes off agent discharges through the nozzles providing jet forming and uniform distribution over a protected area.

Mechanical part sample diagram:

 

2.
Electrical part.

Electrical part includes the following components:

  • Control device
  • Display and control unit
  • Detectors (smoke, thermal, aspirating, flame, thermocable)
  • Manual annunciator
  • Light boards “Gas! Escape!”; “Gas! Do not enter!”; “Automatic is disabled!”.
  • Card reader for switching on/off automatic mode
  • Magnetic contact detector
  • Backup power supply
  • Battery

Agent release can be accomplished in different modes:

  • Automatic – with detectors
  • Remote – with manual annunciators located on the entrance to protected rooms.
  • Manual – by pulling by hand manual release lever on a cylinder

The principle of operation of Gas Fire Suppression System:

1.
Automatic release.

In case two detectors trigger signaling of a fire in a protected room, the control device switches on light indication boards GAS, ESCAPE THE ROOM located inside and outside the room. After the delay in personnel escape has elapsed, electromagnetic release device receives impulse to open agent cylinders. Consequently, agent enters distribution pipeline and discharges into the protected area through the nozzles. After agent has entered distribution pipeline pressure annunciator signals control station of agent discharge

2.
Remote start.
If a fire is discovered before detectors trigger or automatic mode is disabled, the system has remote control option.
3.
Manual mode (locally).
Manual mode can be activated in case of a failure of a control system or electrical part. In Manual mode agent discharge is accomplished by pulling release lever on a pilot cylinder.

Scope of application of Gas Fire Suppression Systems:

  • Data Centers
  • Radio Centers
  • Mobile Communications Rack Rooms
  • Archives and Museums
  •  ACS Rack Rooms and Server Rooms
  • Gas Pumping Plants
  • Industrials Robots Control Equipment
  • Engine Rooms
  • Generator Rooms
  • Diesel Generators
  • Switchboard Rooms
  • Warehouses
  • Power Transformers Room
  • Electric Power Plants Facilities
  • Electric Motors and other Household Electric Devices
  • Railway Control and Communications Facilities
  • Air Traffic Control Halls
  • Transportation Companies Data Processing Centers
  • Pump Rooms and Compressor Rooms
  • Cargo Holds and Tanks
  • Transport Vehicles Cabins
  • Passengers Cabins

Our friendly well-qualified staff will assist you in choosing all system components and making the right decision. We will do our best to protect your valuable property and to save your money.

Have questions? Call us

+7 (495) 742-61-45

Or write to Email

info@asptgroup.ru

Application for the selection of the gas fire extinguishing system