Document bOywMV62gz8DxwxdKgvYdNXbD

FIRE EXTINGUISHMENT AND CONTROL er type of diy powder and the method of application. A problem recently developed m fire fighting involves pyrophoric liquids, such as tnethylalummum These liquids ignite spon taneously and the resulting fires cannot be easily extinguished by dry powder or other commonly used agents A special material ("Met-L-Kyl") has been developed, con sisting of a bicarbonate base dry chemical and an activated absorbent The principle of extinguishment involves the combination effect of dry chemical, which extinguishes the flames, and the ab sorbent which absorbs the remaining fuel and prevents reignition This extinguishing agent has been designed so that it can be discharged from an extinguisher similar to the standard cartridge-operated dry chemi cal model Federal rules on fire extinguishers Effective June 13, 1962, a Federal Food and Drug Administration ruling requires special labeling on fire extinguishers that produce substances that are highly toxic or toxic when used according to directions The ruling states that 1 If the substance produced is highly tone, the labeling must contain the word "Danger" and the statement "Poisonous gas formed when used to extinguish flame or on contact with heat" 2 If the substance produced is tone, label ing must contain the word "Warning" or "Caution" and the statement "Dangerous gas formed when used to extinguish flame or on contact with heat" 3 Whether or not the substance produced is toxic or highly toxic, any fire extin guisher that if used on an electrical fire, would be likely to cause electric shock must be labeled "Caution Do not use on electrical fires." All fire extinguish ers producing toxic or highly toxic sub stances must also be labeled "Use in an enclosed place may be fatal" and "Do not enter area until well ventilated and all odor of chemical has disappeared " A product is "toxic" under the law if it has the capacity to cause personal injury to man through ingestion, inhalation, or ab sorption through the body surface A prod uct is "highly toxic" if tests have shown that it produces death in test animals under controlled conditions The above information is an amendment to the Federal Hazardous Substances La beling Act published in the Federal Reg ister, Vol 27, April 5, 1962, p 3,255 Miscellaneous equipment Wheeled equipment Large portable units on wheels are commercially available and include 17-gal and 30-gal soda-acid, loaded stream, calcium chloride, and foam types, 50-Ib, 75-lb, and 100-Ib carbon dioxide types, and 150-Ib and 350-lb dry-chemical types (See Fig 34-1 ) Wheeled "twinned" extinguishers With the development of fluorocarbon surfactants that are water soluble, foam agents are available that give water the property of floating in thin layers on liquid fuel sur faces ("light water"). This characteristic provides excellent protection against reflasb on liquid hydrocarbon fires with only onefourth the volume as compared to protein/ air foam A combination wheeled extinguisher with "purple K" dry chemical and "light water" fluorocarbon foam provides a synergistic ex tinguishing system with both rapid knock down of flames and complete protection against reflash The two agents are simul taneously applied through dual pistol-gnp nozzles Vehicle-mounted equipment Water, foam, carbon dioxide, and dry chemical extinguish ing agents are available m units that are mounted on vehicles The range in size from in plant fire vehicles capable of turning m warehouse isles, to large trucks suitable for refinery or airport protection Fire blankets. In some cases, fire blan kets can be used to smother a small fire Their major purpose is to extinguish burn ing clothing, but they are useful, too, for smothering flammable liquid fires in small open contamers Asbestos and fiameproofed woolen blan kets are available, the most common size is 66 by 80 m Blankets are usually stored m contamers mounted on a wall or column, so arranged that they can be readily pulled out Miscellaneous hand equipment. Five-gal or 214-gal water or antifreeze back-pack tanks are available with hand pumps built into the hose nozzle handles. This type of unit is earned on the back, and the sbde 34-29