Extinguishants water

Class A Fires Fires arising mainly because of paper, wood, textiles etc. are known as Class A fires. The use of foam extinguishers, water pumps, water sprays, and gas cartridges etc. is recommended to fight Class A fires. Further, experts are of the opinion that almost any type of extinguisher is satisfactory for such fires. 

SAFETY PROFILE Moderately toxic by intraperitoneal route. Probably an irritant to skin and mucous membranes. Dangerous fire hazard a powerful oxidizer. Store in a cool place away from fire hazards, sparks, open flames, and out of the direct rays of the sun. Dangerous explosion hazard this material may explode by heat (over 38°) or contamination. Any contaminant that acts as an accelerator to the polymerization or decomposition of this material can cause an explosion. Heat or contact with certain fumes or mists can cause it to explode. To fight small fires, use CO2 or foam extinguishers. Water spray or mist may also be used. Dry chemical is effective. When heated to decomposition it emits toxic fumes of Cr. See also PEROXIDES, ORGANIC. 

Send a man round the neighbourhood commandeering hie extinguishers, water buckets, etc. 

In addition to this, superabsorbent polymers are used as additives in fire extinguishing water, materials for water-swellable toys, paint for prevention of water leakage, for removal of water in oil, etc. 

Locating and using portable fire extinguishers types of extinguishers (water, carbon dioxide, foam, Halon, dry chemical, and power) and techniques for portable extinguishers. 

Reacts with acids, acid salts, chlorates, nitrates, aliphatic amines, isocyanates, oleum. Decomposes above boiling point 442°F/227°C, forming lethal hydrogen cyanide gas. Avoid hot water and steam. Attacks mild (low carbon) steel, copper, and copper alloys. Thermal decomposition releases hydrogen cyanide gas. On small fires, use dry chemical powder (such as Purple-K-Powder), alcohol-resistant foam, or CO2 extinguishers. Water may cause foaming. 

If a fire cannot be or is not to be extinguished, water sprays should be used to rescue personnel and to keep structural surfaces, tanks, and pipes cool. In general, support surfaces should be coated with an insulating material to protect them from direct contact with cold liquid should a spill occur, and from heat should a fire result. 

Small-scale fires of plastics can be controlled by any available extinguisher. Water is also allowed (even for low-density plastics, since there is no risk of floating). Blankets and sand are suitable as well the latter is especially useful for plastics that tend to melt. Any kind of portable extinguishers can be used. 

Analyze the fire loads and fire controls. Determine if com-partmentation is adequate. Analyze water supplies for adequacy at all locations where there is a need for extinguishing water or emergency showers. Consider the value of sprinkler systems and the type best suited to each location. 

In a WWER NPP, an inadvertent activation of the fire extinguishing water system led to a flooding of the auxiliary control room. 

The selection of an extinguisher depends on factors such as the composition of the dust, its situation, and the presence of other hazardous materials. The most commonly used extinguisher, water, cannot be used for fire involving electric equipment or reactive metals (e.g., aluminum or magnesium). Gases or vapors such... 

In some cases where thick concrete walls or slabs are provided and a fire may occur, a structural analysis should be carried out with the temperature gradient due to fire plus any additional operating loads under fire conditions (e.g. extinguishing water). In accordance with extreme load conditions the load factor of unity may be used under ultimate load design for postulated fire loading conditions. 

---