ONLINE ELECTRICAL ENGINEERING STUDY SITE

Gas Extinguishing System

This type of extinguishing can be used as total flooding fire gas extinguishing systems protecting hazards against the most flammable substances.gas  extinguishing system The gas extinguishing system consists of cylinders filled with inert gas and it gets activated automatically as it receives any signal of hazard from the detection system. Such extinguishing systems are residue free and constituents of air. In this system, Oxygen content in the fire affected area get reduced by introducing inert gases like nitrogen or argon.

Inert Gas Mixture

Gas extinguishing system consists of inert gas mixture consisting of 50 % argon and 50 % nitrogen. These gases isolate the area from oxygen and due to which fire get extinguished rapidly. The purpose of using these inert gases in extinguishers is that these gases are not harmful for living beings and electrically non conducive. Now a day chemical extinguishing systems are also being used for sensitive area like electric equipment rooms. This system is compact and use chemicals to extinguish fire which is highly environment friendly.

Gas Extinguishing System Consists of

The gas extinguishing system consists of cylinders filled with inert gas and it gets activated automatically as it receives any signal of hazard from the detection system. Such extinguishing systems are residue free and constituents of air. In this system, Oxygen content in the fire affected area get reduced by introducing inert gases like nitrogen or argon. These gases isolate the area from oxygen and due to which fire get extinguished rapidly. The purpose of using these inert gases in extinguishers is that these gases are not harmful for living beings and electrically non conducive. Now a day chemical extinguishing systems are also being used for sensitive area like electric equipment rooms. This system is compact and use chemicals to extinguish fire which is highly environment friendly. Especially, very effective for small sized room. It includes many accessories like nozzles, valves, discharge pipe etc. The Inert gas used for extinguishing fire should be any of the proven inert gas system specified under NFPA-2001. It is stored as pressurised gas within the cylinder assembly. It is available at storage pressure of 200 and 300 bar, and when fully discharged it is clear no vision obscured.

Application of Gas Extinguishing System

The inert gas extinguishing system covers an area which are highly sensitive or the area which has valuable assets which might be damaged by using some other measures of fire extinguishing. One centralized total flooding type clean inert gas extinguishing system shall be provided for the following areas as a protection for fire damage:
  • Control room of the main plant
  • The hidden area under the false ceiling.
  • Computer room and data storage room.
  • Control Equipment Room
  • Inverter room.
gas  extinguishing systemThe inert gas flooding system for the above areas shall consist of battery of inert gas storage cylinders of adequate capacity, which shall be located suitably at centralized locations. Discharge nozzles shall be provided on the gas distribution pipe network suitably located on the areas to be protected.

Design Requirements of Gas Extinguishing System

The design and manufacturing of the system is a matter of great importance and therefore it should be according to the standard safety norms. Following are the design guideline to be strictly followed:
  1. The possibility of leakage of gas and duct area of re-circulating air conditioner system should be kept in consideration to achieve the correct quantity of gas required for covering total hazarded area.
  2. There should be a permanent connection for the main system from the distribution pipe for the smooth changeover from the panel and the discharge time period should not be more than 1 minute.
  3. The complete capacity of the room including the area above false ceiling should also be kept in consideration for estimation of the quantity of gas and containers required.
  4. The storage containers should not be kept openly. It should be installed properly so that servicing and weighing could be done without shutting down the system.
  5. Automatic means such as check valves shall implement to prevent gas loss if the system is operated when any containers are removed for maintenance.
  6. The pressure relieving device should be provided to the system for maintaining the maximum designed pressure of the system.
  7. The system should be designed in such a manner that the whole hazarded area is covered uniformly by gas without disturbing any fitting and fixtures.
  8. There shall be provision for primary supply of gas and its cylinders, along with 100% standby / reserve gas quantity and cylinders for each room.
  9. There should be proper battery backup for electrical actuators in case of power failure.
  10. At controlling desk, there should be a facility for selection auto or manual releasing of gas through a push button.
  11. Once complete installation of the system is being done, the whole system should be inspected and tested as per norm of safety and regular testing of the system should be done at a regular interval.
  12. Appropriate warning signs should be mentioned outside of those areas protected by the system and also in areas where the gas may spread indicating clearly the hazard associated with the system such as Noise, turbulence, cold temperature, physiological effects on personnel etc.
Audio-visual type warning signs (i.e.) hooters and strobe lights should be given before discharge and after discharge activity.

Closely Related Articles
More Related Articles
New Articles
Please provide your valuable comments
Name : -

Email : -

Location : -

Your content : -

captcha



electrical4u apps