A study of portable water mist fire extinguishers used for extinguishment of multiple fire types

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.firesaf. 2006.06.008 Fire Safety Journal, 42, pp. 25-42, 2007-01-01 ABSTRACTThis paper describes both theoretical and experimental studies on the application of a portable water mist extinguisher in suppressing multiple fire types. Two prototype portable water mist fire extinguishers were developed and their feasibility in extinguishing flammable liquid, cooking oil and wood crib fires, and for use in fires associated with an energized target was investigated. The interaction between water mist and the fire plume was studied by analyzing the instantaneous process of fire extinction, and fire and fuel temperature profiles. Both theoretical analysis and experimental results showed that the extinguishing mechanisms and process as well as water mist characteristics required (such as water flux density, droplet size and spray coverage) change with the types of fires encountered. The portable water mist extinguisher with appropriate mist characteristics was able to extinguish multiple fire types.Key Words: water mist, portable extinguisher, multiple fire types and fire suppression.

Combining Bromofluoropropene with Water Mist for Suppressing Deep Seated Wood Crib Fires

“…The temperature kept decreasing until total extinction for the continuous discharging of water mist. Photographs of the tests showed that once the wood was contacted with water mist, the flame was controlled and not any flare up was observed, different to that seen in liquid pool fires [15]. Much smoke was produced, but the room clear up soon after the fire was fully extinguished.…”

“…Experiments on extinguishing wood crib fires are reported by Liu and coworkers [15]. But only with relatively high pressure and long time discharging could extinguish the fires.…”

Effects of water mist addition on kerosene pool fire

“…The slower combustion rate means less product formation and heat generated, which results in flame temperature decrease and so on. For the water mist, the fire suppression mechanisms of water mist include at least three aspects [17,18] : (i) Gas phase and fuel surface cooling; (ii) Local and global oxygen depletion; (iii) Radiant heat blocking to surroundings and fuel surface.…”

Fire Control and Suppression by Water-Mist Systems

“…Moreover, experiments have shown that boil-over or spillage is not present when water mist is discharged into the oil at high temperature (greater than 300°C), while it is observed if oil temperature is relatively low (almost 200°C). The same authors have also carried out an experimental and theoretical research on portable water-mist systems with respect to a variety of fire scenarios [52]. Among these latter, flammable liquids, cooking oil and wood cribs stand as the most interesting applications.…”