SINGLE MEASURE OF FIRE-EXTINGUISHING CAPABILITY OF PORTABLE POWDER FIRE EXTINGUISHERS

When analyzing the parameterization of portable powder fire extinguishers that there is no dependence between the fire-extinguishing ability of fire extinguishers and charge mass of extinguishing powder composition (EPC). Therefore typing should be done largest fire-extinguishing capability, as the main value, which characterizes the process of fighting. Fire-extinguishing ability of the fire extinguisher (only for fires of class Aand B) is determined by the rank and class of model fires size (MFS). Such codification does not reflect extinguishing effect. Combustion stops when the amount of heat bleed EPC exceeds the amount of heat emitted from the hearth burning, in particular with the MFS. On this basis the number of generated heat of comparable rank of MFS class A must match the number of warmth from the MFS class B. Century the amount of heat released from combustion zone is numerically equal to the product of net calorific value of the material on its mass (to simplify the model is taken as the total mass of fuel in MFS). From the analysis of the values of the fire-extinguishing capability of domestic and foreign powder fire extinguishers it was determined according the ranks of the MFS classes A and B, so you can group ranks MFSs for class A and B of the disposal warmth. Based on the foregoing if the fire extinguisher is able to eliminate the burning of the rank of the MFS, the amount of heat taken EPC equals or exceeds the amount of heat released by, in fact, the heat dissipated in the MFS is “warmth extinguishing” the appropriate extinguisher. Given that the fire extinguisher is designed to extinguish a fire at the initial stage of fire, so quenching efficiency will depend not on the total area of the premises, and from the unit of fire load. Accordingly, the choice of the size of the fire extinguisher must depend on the specific fire load in the premises and parameterization of fire extinguishers should be implemented in this order. Therefore, for the realization of the proposed parameterization of fire extinguishers is necessary to determine the specific fire load of the main types of buildings of various classes of functional fire hazard. All production and storage areas must be categorized on fire and explosion hazard, and criterion of assignment to one of the fire risk categories is specific fire load. Specific fire load of the explosionhazardous premises of A and B categories compared to the values of more than 2,200 MJ
m2 as a criterion for identifying the categories of premises is excessive pressure of the explosion, and no specific fire load. For premises other classes of functional fire hazard on the basis of reference data the standard fire load was determined. Equality of “heat extinguishing” fire extinguishers with average specific fire loads typical allow space to introduce a new classification of fire extinguishers without changing creature certification system of fire extinguishers, tied her to the values of the specific fire load of production and warehouse spaces on fire and explosion hazard B1–B4. Based on the foregoing a new classification of fire extinguishers was presented, where we have introduced a new way of codifying them.