| 词条 | Gaseous fire suppression |
| 释义 |
Gaseous fire suppression, also called clean agent fire suppression, is a term to describe the use of inert gases and chemical agents to extinguish a fire. These agents are governed by the National Fire Protection Association (NFPA) Standard for Clean Agent Fire Extinguishing Systems – NFPA 2001 in the US, with different standards and regulations in other parts of the world. The system typically consists of the agent, agent storage containers, agent release valves, fire detectors, fire detection system (wiring control panel, actuation signaling), agent delivery piping, and agent dispersion nozzles. Less typically, the agent may be delivered by means of solid propellant gas generators that produce either inert or chemically active gas. TheoryThere are four means used by the agents to extinguish a fire. They act on the "fire tetrahedron":
ApplicationBroadly speaking, there are two methods for applying an extinguishing agent: total flooding and local application:
In the context of automatic extinguishing systems, local application generally refers to the use of systems that have been emplaced some time prior to their usage rather than the use of manually operated wheeled or portable fire extinguishers, although the nature of the agent delivery is similar and many automatic systems may also be activated manually. The lines are blurred somewhat with portable automatic extinguishing systems, although these are not common. Safety precautionsSuffocationAn extinguishing system which is primarily based on inert gases in enclosed spaces presents a risk of suffocation. Some incidents have occurred where individuals in these spaces have been killed by carbon dioxide agent release (only in the case of CO2 carbon dioxide systems). When installed according to fire codes the systems have an excellent safety record. To prevent such occurrences, additional life safety systems are typically installed with a warning alarm that precedes the agent release. The warning, usually an audible and visible alert, advises the immediate evacuation of the enclosed space. After a preset time, the agent starts to discharge. Accidents have also occurred during maintenance of these systems, so proper safety precautions must be taken beforehand.[1] BarotraumaBarotrauma is physical damage to body tissues caused by a difference in pressure between a gas space inside, or in contact with the body, and the surrounding environment.[2] The positive pressure caused by these gases may be sufficient to break windows and walls. Humans and structures must be adequately protected and ventilation/blow-off must be considered when designing the system. See also
References1. ^{{cite journal |title=Gas extinguishing system may blow out walls and windows |journal=blog.anta.net |date=2009-04-14 |url=http://blog.anta.net/2009/04/14/gas-extinguishing-system-may-blow-out-walls-and-windows/ |issn=1797-1993 |accessdate=2009-04-14 |deadurl=yes |archiveurl=https://web.archive.org/web/20110726135345/http://blog.anta.net/2009/04/14/gas-extinguishing-system-may-blow-out-walls-and-windows/ |archivedate=2011-07-26 |df= }} 2. ^{{cite book |title=US Navy Diving Manual, 6th revision |year=2006 |publisher=US Naval Sea Systems Command |location=United States |url=http://www.supsalv.org/00c3_publications.asp?destPage=00c3&pageID=3.9 |archive-url=https://web.archive.org/web/20020809034155/http://www.supsalv.org/00c3_publications.asp?destPage=00c3&pageId=3.9 |dead-url=yes |archive-date=2002-08-09 |accessdate=2008-05-26 |df= }} External links
4 : Active fire protection|Fire suppression|Firefighting equipment|Industrial gases |
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