Flame Extinguishment Properties of Dry Chemicals: Extinction Weights for Small Diffusion Pan Fires and Additional Evidence for Flame Extinguishment by Thermal Mechanisms
- 1 January 1992
- journal article
- Published by SAGE Publications in Journal of Fire Protection Engineering
- Vol. 4 (2) , 35-51
- https://doi.org/10.1177/104239159200400201
Abstract
An experimental study was made of the extinguishment of a small n-heptane diffusion flame (25.5 cm dia. pan) by a number of dry-chemical powders — KHCO3, NH 4H2PO4, Na2B4O7 . 10H2O, (NH4)2SO4, K2CO 3, K4Fe(CN)6 . 3H2O, Na2CO 3, K2SO4, NaCl, Na2C2O 4, K2C2O4 . H2O, and Monnex. The minimum weight of each required for flame extinction was determined as a function of particle size and sieve fraction. The sharp dis continuity previously observed1 is shown to be a common phenomenon. The experimental procedure was such that complete flame penetration was achieved for all particle sizes of each substance. Therefore, all results are latent, or maximum possible, effectiveness values. Flame extinguishment effectiveness is defined as the reciprocal of the extinction quantity.Keywords
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