Borodych P., Kovalov P., Strilec V., Myroshnychenko A. Laws of the air flow in scba during the rescue operations in the deep foundation subway stations. P. 100-116.

Laws of the air flow in scba during the rescue operations in the deep foundation subway stations

 

Pavlo Borodych

National University of Civil Defence of Ukraine

https://orcid.org/0000-0001-9933-8498

 

Pavlo Kovalov

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-2817-5393

 

Valerii Strilec

LLC «Brand Trade»

http://orcid.org/0000-0003-1913-7878

 

Anton Myroshnychenko

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-2817-5393

 

DOI: https://doi.org/10.5281/zenodo.4400177

 

Keywords: compressed air apparatus, air consumption, metro, emergency and rescue work, gas and water defender

 

Abstract

The technical capabilities of compressed air devices that are in service in fire and rescue subdivisions are considered, if they are used by personnel of the units (departments) of the gas and smoke protection service during emergency rescue operations at deep underground metro stations, which are the most dangerous when they occur on fire or other emergency. In the course of the study, the results of special tactical exercises at deep-laid stations of the Kharkiv metro were used, which were organized in such a way that the times obtained experimentally for the execution of typical tasks by gas and smoke defenders, as well as the corresponding indicators of the initial and final pressure in cylinders of compressed air apparatus, became the basis for obtaining statistical samples of consumption air rescuers. The analysis of the results made it possible, with a significance level of α = 0.05, to show that the regularity of the air consumption in compressed air machines during the rescue operations at deep underground metro stations is the normal function of the indicator under consideration. It is noted that in all modes of operation in compressed air machines, the air consumption is higher not only the standard indicators of pulmonary ventilation, but also the indicators of the air consumption when performing the corresponding tasks in the heat-smoke chamber. The obtained ratio of the pressure change in compressed air machines when performing individual operations by gas and smoke defenders makes it possible to use it to substantiate recommendations related to clarifying the calculated ratios used at the security post of the gas and smoke protection service. It is shown that the minimum pressure in compressed air machines at the moment of exit should be three times the value by which the pressure decreased during the movement to the place of the emergency. On the basis of the revealed regularities, expressions are recommended for simplified calculations of the time of termination of exploration and the return of a link (section) of the gas and smoke protection service to clean air. The use of the proposed simplified relationships will allow the guard at the security post to pay more attention to the preparation of the link of the gas and smoke protection service and control of its work in the process of carrying out rescue operations.

 

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