Carbon dioxide systems halons

Hydrant and hose fire stations, sprinkler and deluge systems, carbon dioxide, and halon. 

In most cases of electric fires, plastic insulation will be burning. For this reason, carbon dioxide or halon extinguishers are preferred in order to prevent damage to the equipment. Water or foam must not be applied unless the system has been de-ener-gized. 

Fixed installations, such as water spray systems, halon systems, sprinkler systems, carbon dioxide extinguishing systems, explosion suppression systems, and other fire protection installations are often provided with flow and trouble detection switches connected to transmitters. A signal indicating the condition of the system should be sent to the attended location(s). 

NFPA 11—Standard for Low-Fxpansion Foam NFPA 11A—Standard for Medium- and High-Expansion Foam Systems NFPA 12—Standard on Carbon Dioxide Extinguishing Systems NFPA 12A—Standard on Halon 1301 Eire Extinguishing Systems NFPA 13—Standard for the Installation of Sprinkler Systems NFPA 15—Standard for Water Spray fixed Systems for Fire Protection NFPA 25—Standard for the Inspection, Testingand Maintenance of Water-Based Fire Protection Systems... 

Types of fire, size-up procedures, and types of extinguishers (pressurized water, foam, halon, carbon dioxide, and dry powder). Industrial Training Systems Corporation Rental 95 (3-day), 175 (10-day) Purchase 495... 

A major distinction between the use of carbon dioxide as an extinguishing agent and the Halon systems described in earlier sections is that the extinguishing mode for carbon dioxide is primarily simple smothering of the burning fuel, with no chemical action involved. There is tittle cooling action, with an effectiveness for carbon dioxide of about one tenth that of an equivalent amount of water. As a result, once the carbon dioxide has dissipated, the possibility of reignition exists if there are any sufficiently hot areas still present. 

In areas where fire potential and the risk of injury or damage are high, automatic fire-extinguishing systems are often used. These may be of the water sprinkler, foam, carbon dioxide, halon, or dry chemical type. If an automatic fire-extinguishing system is in place, laboratory workers should be informed of its presence and advised of any safety precautions required in connection with its use (e.g., evacuation before a carbon dioxide total-flood system is activated, to avoid asphyxiation). 

Suppression systems that do not use water or modify properties of water work for particular applications. One should refer to applicable standards for design and use of these systems and agents. The agents are carbon dioxide, halons, dry chemicals, foams, and combustible metal agents. 

---