Algorithm for Application of Methods for Detecting Central Signs of an Emergency Situation Due to Fire at Critical Infrastructure Facilities

Abstract

The work is devoted to the solution of an actual scientific task in the field of civil protection, namely, the development of an algorithm for the application of the technique of detecting focal signs of an emergency situation due to a fire at critical infrastructure facilities. Recommendations for the practical application of the methodology as the basis of the method of non-destructive control of the processes of preventing emergency situations due to a fire of a terrorist nature at the objects of critical infrastructure of Ukraine are given. the algorithm for the application of the method of detecting focal signs of an emergency situation due to a fire at critical infrastructure facilities consists of three procedures, namely: procedures for conducting measurements at a critical infrastructure facility, procedures for statistical processing of measurement results, fire reconstruction procedures. The received general recommendations of the fire reconstruction procedure can be reduced to the following. In particular, we note that the value of the electrical resistance of soot is related to the mode of combustion in one or another zone. If this value, which was measured directly above the investigated area, exceeds 10101011 Ohm, then this indicates that there was no intense flame burning in this area, but the burning took place in the form of smoldering. Long-term smoldering of a fire load in conditions of insufficient air exchange can lead to the formation of a thick layer of greasy soot on the ceiling and in the upper part of the walls, sometimes with clear drops of the liquid phase or drop-like spots. This can be observed in small rooms and other volumes that are not ventilated. If the combustion moves from such premises to a larger space with better air exchange, and a flaming combustion occurs, then the formed electrical resistance pattern will mainly reflect the development of flaming combustion. The source of the fire may appear in the form of soot burning or extremely low values of its electrical resistance, or vice versa, in a rather thick layer of soot with a high content of extractive substances. Thus, the interpretation of the results of the measurement of electrical resistance must be accompanied by an analysis of the specifics of the volume-planning decisions of the building (room), the conditions of air exchange, and the distribution of the fire load. The obtained results of the soot research can be used within the framework of fire engineering expertise to reconstruct the process of the occurrence and development of combustion, including to establish the center of the fire. Keywords: emergency situation, critical infrastructure object, technique, focal signs, thermal damage.