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MISTING OF LOW VAPOR PRESSURE HALOCARBONS
Citation:
Tapscott, R., D. Dierdorf, AND S. Skaggs. MISTING OF LOW VAPOR PRESSURE HALOCARBONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/044.
Description:
The paper gives results of a laboratory-scale study of the use of misting systems to provide total-flood fire protection with lower vapor pressure halocarbons. (NOTE: Several candidate Halon 1301 replacements with a low ozone-depletion potential have higher boiling points (usually corresponding to higher molecular weights) and lower vapor pressures than Halon 1301.) ive chemicals were investigated: 2,2-dichloro-1,1,1-trifluoroethane, CHC12CF3(HCFC-123); perfluorohexane, C6F14; perfluoromethylcyclohexane, 6F11CF3; perfluorodimethylcyclohexane, C6F10(CF3)2; and perfluoromethyldecalin, C10F17CF3. hese materials have boiling points between 24 and 55 C, and molecular weights between 153 and 512 (Halon 1301 has a boiling point of -57.8 C and a molecular weight of 149). esting was conducted in a 175liter enclosed test chamber that has been used in the past to test Halon 1301 replacement candidates; however, it had not been used before to examine misting systems. wo type's of misting nozzles were used: one with a hollow-cone spray pattern (atomizing), and the other with a full-cone spray pattern. ive sizes of the hollow-cone nozzles were used. ualitative tests, using water. were run on three sizes of the full-cone nozzles, which had larger flow rates and drop sizes.