Emergency Response Guidebook - Gujarat State Disaster ...

ViscosityWarm zoneWater-sensitiveWater spray (fog)GlossaryMeasure of a liquid’s internal resistance to flow. This property isimportant because it indicates how fast a material will leak out throughholes in containers or tanks.Area between Hot and Cold zones where personnel and equipmentdecontamination and hot zone support take place. It includes controlpoints for the access corridor and thus assists in reducing the spread ofcontamination. Also referred to as the contamination reduction corridor(CRC), contamination reduction zone (CRZ), yellow zone or limited accesszone in other documents. (EPA Standard Operating Safety Guidelines,OSHA 29 CFR 1910.120, NFPA 472)Substances which may produce flammable and/or toxic decompositionproducts upon contact with water.Method or way to apply or distribute water. The water is finely divided toprovide for high heat absorption. Water spray patterns can range fromabout 10 to 90 degrees. Water spray streams can be used to extinguish orcontrol the burning of a fire or to provide exposure protection forpersonnel, equipment, buildings, etc. (This method can be used toabsorb Vapours, knockdown Vapours or disperse Vapours. Direct awater spray (fog), rather than a straight (solid) stream, into the Vapourcloud to accomplish any of the above).Water spray is particularly effective on fires of flammable liquids andvolatile solids having flash points above 37.8oC (100oF).Regardless of the above, water spray can be used successfully onflammable liquids with low flash points. The effectiveness dependsparticularly on the method of application. With proper nozzles, evengasoline spill fires of some types have been extinguished whencoordinated hose lines were used to sweep the flames off the surface ofthe liquid. Furthermore, water spray carefully applied hasfrequentlybeen used with success in extinguishing fires involving flammable liquidswith high flash points (or any viscous liquids) by causing frothing to occuronly on the surface, and this foaming action blankets and extinguishesthe fire.The Emergency Response Guidebook is normally revised and reissued regularly.However, in the event of a significant mistake, omission or change in the state ofknowledge, special instructions to change the guidebook (in pen-and-ink, withpaste-over stickers, or with a supplement) may be issued.Users of this guidebook should check periodically to make sure their version iscurrent. Changes should be annotated below. Contact:GSDMAhttp://gsdma.org/This guidebook incorporates changes dated:_____________________________________________________________________________________________________________________________________________Page 384Page 385