Introduction. To date, fires in high-rise buildings are one of the significant problems faced by fire protection units. Unique objects require a special approach in terms of fire safety and fire extinguishing. The most important task is to ensure the supply of extinguishing agents to the height using modern fire-fighting equipment and installations.Materials and methods. In September 2021, to conduct experimental scientific and tactical exercises on the roof of the Neva Towers tower, a program and methodology for supplying fire extinguishing agents in various ways to the height were developed. The following methods of feeding to height were considered: deployment using the equipment of a container for high-altitude firefighting, feeding from an installation with compression foam technology, feeding using a waterjet cutting unit “Cobra”.Theoretical bases. A theoretical assessment of the possibility of supplying extinguishing agents to a height with the help of new fire-rescue equipment confirmed the need for experimental scientific and tactical exercises on the roof of the Neva Towers tower.Results and discussions. As a result of the scientific and tactical exercises, the effectiveness of the use of new fire extinguishing systems with compression foam supply, as well as installations with waterjet cutting technology “Cobra” was proved. It was possible to provide a feed to a height of 350 m.Conclusions. To date, with the help of new fire extinguishing technologies, it has been experimentally proven that their use is most effective compared to “traditional” methods of supplying extinguishing agents. In the future, it is necessary to conduct more detailed studies of the hydrodynamic parameters of pumping and bag systems in order to develop recommendations for preliminary planning of the actions of forces and means of fire and rescue units.

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Purpose. The article describes methodology for conducting research on parameters of compression foam cooling during its delivery through hose-pump systems depending on the operating modes of the foam generating installation. The impact of mass consumption of compression foam on its cooling at low temperatures has been examined. The application of a mathematical model of air-foam mixture movement in hose-pump systems at different temperature modes has been substantiated. Methods. Empirical method-experiment has been used for research. Findings. A number of experiments have been carried out to confirm the developed model of compression foam moving in hose-pump systems at different temperature modes. A mobile installation for generating and delivering compression foam has been used as the object of the research. Inaccuracy in calculations obtained with the help of a mathematical model in comparison with the experimental data is 10% which makes a possible to claim that the model of compression foam moving in hose-pump systems at different temperature modes has been chosen properly. Research application field. According to the obtained data, it is possible to plan means and forces of fire units for extinguishing fires using compression foam at low temperatures. Conclusions. The developed mathematical model of compression foam movement during its delivery through hose-pump systems is confirmed by experimental data. The dependence of mass consumption impact on compression foam cooling when it is delivered through fire hoses at low temperatures has been obtained experimentally.

Introduction. The article describes a methodology and a program of experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures. The numerical values of the parameters of the cooling strength of the compression foam when feeding through the fire hose 20 m long are determined. The experimental dependences of the parameters of the cooling strength of the compression foam on the multiplicity and mass flow are obtained. Goals and objectives. A program and methodology for experimental studies to determine the parameters of the intensity of cooling of compression foam when feeding through pumping and hose systems has been developed. To carry out experimental studies, the following tasks were set: - development of a measuring complex for determining the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at negative temperatures; - determination of the physical model of the movement of the compression foam when feeding through the fire hoses; - development of a program and methodology for experimental research to determine the mass flow rate of compression foam. Methods. Methods of mathematical analysis of statistical data obtained during experimental data were used to determine the parameters of the cooling strength of compression foam when feeding through the pumping and hose systems. Results and its discussion. The numerical value of the cooling of the compression foam when feeding through the pumping-hose systems at low temperatures was obtained experimentally, depending on the multiplicity along the length of the hose line. Conclusions. 1. A program and methodology for conducting experimental studies to determine the parameters of the cooling strength of compression foam when feeding through pumping and hose systems at low temperatures has been developed. 2. As a result of the experimental studies, data were obtained on the rates and parameters of the cooling strength of the compression foam when feeding through fire hoses in winter at various negative temperatures. To measure the parameters of the cooling strength of compression foam when feeding through fire hoses at negative ambient temperatures, a measuring complex was developed and assembled. 3. The data obtained will make it possible to evaluate the parameters of the compression strength of foam cooling when feeding through the pumping and hose systems at low temperatures. Keywords: intensity of cooling, compression foam, foam-air mixture, pumping-hose system, foam generating unit, a unit for generating and supplying compression foam, low temperatures