An engineering method was developed for determining the critical time of fire and determining the probability of evacuation of people from zone of fire, which makes it possible, with simplified dependencies, to quickly determine all the necessary factors in the evacuation process of people in case of fire in the building. To explain the use of the developed method, the sequence and example of determining the critical time of fire and determining the probability of evacuation of people from zone of fire for enterprise is considered. It was shown how one could calculate the time of evacuation of people from the premises from the zone of fire. The safety of people is provided when the time of evacuation does not exceed the time of the onset of the critical phase of the development of fire. For this purpose, the period for which the temperature, smoke density, oxygen concentration, hydrogen chloride, carbon dioxide and carbon monoxide gas reaches extremely dangerous values for a person was calculated. After determining all the necessary quantities, the probability of evacuation of people was analyzed in the absence of firefighting equipment in the building. The parameters determined by this new method are adequate and confirmed by other methods of calculation, in particular, developed by Hulida, Koval and FDS program. The relative error between the specified parameters does not exceed 8...12% (in comparison with other mentioned methods).

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Introduction. The fire hazard analysis of young pine stands was carried out. There are listed the most common sources of ignition as factors of influence on the occurrence of a fire. There is described the examples of studies on solid combustible materials` ignition, particularly, forest litter. The device developed is proposed for studying the process of forest fuels combustion. The aim of the work is determine the time to ignition of pine needles, as well as the forest litter in young pine stands by using a Device for the study of flammable material combustion using an electric heating element. Material statement. Laboratory studies have been done to ignite three types of needles of young pine plantations: fresh, inherent in the composition of forest underlay and dried needles. There was conducted an experimental studies of the time interval to the ignition of pine stands forest litter in the field condition with the use of the proposed device. Scientific novelty. It for the first time was established that the time interval before ignition of freshly cut needles exceeds by almost 4 times the meaning of this value in comparison with the dried needles. It was established that the value of the time to ignition of pine needles fallen in the forest litter, obtained from the results of field studies, with a slight deviation of its moisture, is almost the same with the values obtained in laboratory conditions. The results indicate that the forest litter in pine stands is fire-hazardous and can deal with a frequency close to ½ of a source with a temperature of 450°C, on average 25,7 seconds. There has been substantiated the expediency of using the device for the study of flammable material combustion using an electric heating element for investigating indicators of forest combustible materials` fire hazard.

38 4) instant inclusion of smoke protection systems (smoke and heat removal system with opening mechanism) 5) automatic opening of evacuating doors; 6) instant inclusion of an automatic fire extinguishing system for objects.At the present stage, when installing fire protection systems (FPS) at the facility, a problem arises that they do not take into account for the facility, in order to reduce the cost of purchasing fire protection systems, the allowable service area for each device in the system. This approach leads to a decrease in the functionality of the fire protection system of the facility by 40...65 %. In turn, in case of fire at the facility, in this case, losses from the fire increase 2...3 times [1].Fire statistics indicate that the number of fires in warehouse buildings in Ukraine annually exceeds 130 [2]. In most cases, warehouses are burned to the ground for a large amount of fuel load and the failure of fire protection systems to ensure their fire safety. Over the course of 5 years, a significant number of fires occurred in the USA, namely 1210 in

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