Introduction. Railway enterprises are characterized by an increased labor risk, the professional activity of personnel is associated with the risk of injury. Occupational safety measures are regularly carried out in the industry. At the same time, accidents are known to occur in Russian Railways JSC (Russian Railways). Risk reduction requires a theoretical study of the problem, as well as the study of applied solutions, which determines the relevance and significance of the proposed study. The purpose of the work is to determine the resulting indicators on which the dynamics of industrial injuries in Russian Railways depends.

Materials and Methods. To identify the causes of injury to railway transport workers of the Russian Railways holding, the authors analyzed statistics for 2007–2021. We systematized and ranked 17 types of accidents, which are associated with accidents resulting in injuries. Using the Pareto chart, they were differentiated as resultant and non-resultant. We identified 7 resultants. We performed a stochastic analysis and established the relationship of each factor with the total number of accidents. The correlation coefficients were calculated.

Results. Preliminary calculations were presented in the form of a table to obtain the coefficient of stochastic dependence of industrial injuries on the number of injured employees of Russian Railways in road accidents. The value of the stochastic relations coefficient was calculated and adjusted. The average error was determined — the difference between the general injury rate and the injuries in road accidents. The results of these calculations were compared with the data of the Student's t-distribution quantile table for confidence probability. Similarly, the degree of stochastic relationships for the other resulting types of incidents was calculated and summarized in a table. The result was visualized in a diagram.

Discussion and Conclusion. The results of the conducted surveys allow us to assert that the dynamics of industrial injuries in Russian Railways JSC is determined mainly by incidents in road accidents. It is necessary to investigate their causes and develop measures aimed at improving occupational safety.

Introduction. The topic under consideration is updated by official domestic statistics, according to which more than a third of employees work in harmful and dangerous conditions. During the production process, people get injured and maimed, lose their ability to work. Dozens of fatal incidents are recorded at workplaces every year.

The purpose of the study is to show the advantages and prospects of the introduction of gaming computer technologies in the training of workers in labor protection in the agro-industrial complex (AIC).

Materials and Methods. The scientific literature devoted to the educational possibilities of digital gaming solutions is considered. In relation to the topic of this study, the potential of a number of computer games, virtual, augmented and mixed reality technologies is evaluated. The well-known and commercially available gaming software is considered in relation to the topics and objectives of occupational safety training. The strengths and weaknesses of this approach are noted.

Results. The paper shows how to prepare for the introduction of gaming computer technologies into the occupational safety training system. In particular, it is necessary to identify and systematize the causes of accidents and injuries at work, to focus on industry (in this case, the most typical for agriculture). Special attention should be paid to organizational risks, because if they are neglected, personnel will work in initially dangerous conditions and high- quality training may be useless. The approaches to the organization of training, conducting classes, checking and consolidating knowledge are considered. Digital gaming products that have proven themselves in occupational safety training in various industries, including the agro-industrial complex, are presented. Variants of such training are considered. The use of digital gaming technology tools for the qualitative development of safety techniques, the formation of safe behavior skills and motivation to prevent injuries is justified.

Discussion and Conclusion. The results of the work allow us to assert that gaming computer technologies can be successfully used for teaching occupational health and safety in agriculture. This approach has serious advantages in terms of organization, visibility, cost-effectiveness and safety. Certain disadvantages of the method are likely to hinder the widespread implementation of such solutions in occupational safety training at agricultural enterprises for some time. However, in the medium term, it is possible to predict the solution of the identified problems due to the development of the digital games market, virtual technologies and the development of domestic analogues.

Introduction. The article is devoted to the problems of ecological consequences of forest fires in protected areas. It is proposed to assess atmospheric air pollution during forest fires and their impact on public health by the calculated method of specific emissions and hazard coefficients. The aim of the work is to perform a comparative analysis of environmental risks for the populations of three subjects of the Russian Federation in the Baikal region, and ranking of territories by the level of atmospheric air pollution during forest fires.

Materials and Methods. The initial data were statistical information on forest fires in the Irkutsk region, the Republic of Buryatia, the Trans-Baikal Territory in the period from 2013 to 2020, procedural documents of forest fires, including schemes and types of fires, areas and coordinates of fires, protocols of inspection of the fire site, acts of official investigation and other materials.

Results. The paper analyzes forest fires in the protected Baikal natural area of the Baikal region and their environmental consequences. The emphasis is placed on establishing the average annual characteristics of forest fires (number, area, economic damage, specific emissions of combustion product into the atmosphere, risks to public health). It is proved that bulk emissions from forest fires bring additional atmospheric pollution; it is 20 % of stationary sources of emissions. The Republic of Buryatia and the Irkutsk region contribute the most to the pollution of the atmosphere of the Baikal region.

Discussion and Conclusion. The methodology proposed by the authors for ranking territories by environmental risks can be used for predictive assessment of the consequences of fires for public health. The forecast results serve to support organizational and administrative measures, including decisions to attract additional forces and equipment, and to evacuate the population. According to the results of the forecast of the consequences of fires for the health of the population, a fire-fighting plan is being developed, which determines the methods and tactics of fire extinguishing, the distribution of forces and means, the decisive direction of actions, etc. According to the greatest contribution to the deterioration of living conditions and the risk of poisoning by combustion products, the studied territories are ranked in the following order: Irkutsk region – Republic of Buryatia – Trans-Baikal Territory.

Introduction. In 2021, new regulatory legal acts in the field of fire safety came into force. Special attention is paid to the control, classification and minimization of false alarms of fire protection systems and installations. In this regard, it makes sense to refer to the statistics of such triggers on specific objects in order to assess the sufficiency and validity of the criteria proposed in the new documents. The purpose of the work is to study the requirements for maintenance and operation of fire protection systems and installations. The objectives of this study are to study the main approaches to the regulation of false alarms of fire protection systems, analysis of the main quantitative indicators of the operation of systems of a particular object, assessment of the compliance of the protection object with new requirements.

Materials and Methods. The empirical basis of the study was the results of constant monitoring of the state of fire protection systems and installations in one of the largest shopping and entertainment complexes in the South of Russia. The reports of the fire prevention service, data from the automated workplace of the operator of the fire station, records in operational logs were used. The information is summarized in tables by types of false alarms and by chronology. Calculations were performed in MS Excel. To identify the links between different types of false positives, a correlation analysis was carried out.

Results. The connection between the number of false alarms and the intensity of work of tenants of the protection object is noted. The ratios of different types of false alarm and the significance of the triggering factors are determined. The correlation between false alarms and malfunctions of systems is revealed.

Discussion and Conclusion. The methodology developed by the authors makes it possible to monitor malfunctions of fire alarm systems on an ongoing basis. A number of problematic issues of applying the classification of false alarms of the fire alarm system in GOST R 59638-2021 have been identified. A connection has been established between the number of false alarms and the intensity of the work of the tenants of the shopping center. The conclusion is made about the compliance of the protection object with the newly introduced requirements. The identified problematic issues of the application of GOST R 59638-2021 for statistical analysis in future studies force us to develop a different classification of false alarms of fire alarm systems.

Introduction. The article presents an analysis of the destruction of welds that occurred during the operation of modular overhead cranes. Measures are proposed to prevent the occurrence of such defects in the future, reduce the likelihood of accidents and improve the safety of operation of overhead cranes with a welded modular construction. The relevance of the work is due to the fact that in the Russian Federation approximately 65% of the lifting cranes registered with Rostechnadzor have fulfilled the standard service life.

The work objective is to improve the safety of operation of modular overhead cranes and the reliability of their welded metal structures. Achieving the objectives of the work, based on the analysis of the destruction of metal structures of overhead cranes, a diagnostic map of welded joints of metal structures of end beams with modules of travelling wheels of overhead cranes was compiled. The use of the proposed diagnostic card in a production environment will significantly improve the quality of diagnostics of welded joints.

Materials and Methods. Investigations of accidents of load-bearing metal structures of cranes by methods of technical diagnostics of destruction of welds that occurred during the operation of overhead cranes of modular design have been carried out. This made it possible to develop a number of measures to prevent accidents of overhead cranes initiated by the destruction of their welded modular structures.

Results. Based on the analysis of accidents, a diagnostic map of destructing welded joints of metal structures of end beams with modules of travelling wheels of an overhead crane has been compiled. The use of the proposed diagnostic card will increase the reliability of welded metal structures and improve the quality of diagnostics of welded joints in production conditions.

Discussion and Conclusions. As a result of the analysis of structural failures of modular overhead cranes, a number of measures are proposed to prevent the formation of such defects, the occurrence of accidents due to them, and to improve the safety of operation of overhead cranes.

Introduction. The shipping industry pays great attention to the safety of man-made and natural systems. At the same time, increased requirements are imposed not only on the quality of the fuel composition, but also on exhaust emissions. Currently, Annex VI of the MARPOL-73/78 Convention has been ratified by many of its signatories. The compliance with this document requires that engine emissions comply with the specified NO_x level limits. Until recently, such rules were mainly applied in the Baltic and North Seas, but over time, the compliance with environmental standards will affect other areas of navigation.

The work objective is to show through the study of modern technical solutions that we need an integrated approach to solve practical environmental problems, which will allow developing rational schemes of modern marine propulsion systems, taking into account their compliance with the safety requirements of technogenic and natural systems.

Materials and Methods. The methods and recommendations given in open sources and corresponding to the requirements of the International Maritime Organization (IMO) were used in the work. The experience of leading foreign firms and domestic enterprises in terms of modern design solutions that will reduce ship emissions to acceptable limits is analyzed and summarized.

Research Results. The issues related to the study of factors influencing the development of rational schemes of ship propulsion systems, taking into account their current level of development, pricing policy and the compliance with the environmental requirements, are considered. It is shown that one of the effective ways to reduce NO_x emissions is the installation of a selective catalytic reducer (SCR) on the main engine, and the use of efficient and innovative power generation technologies to reduce technogenic emissions. In the medium term, the transition to gaseous fuels is predicted, and in the long term – to hydrogen technologies.

Discussion and Conclusion. Possible technical solutions to reduce emissions of nitrogen oxides by installing selective catalytic reducers on the main marine engines are presented. It is established that one of the promising areas of development are diesel-electric propulsion systems. It is shown that in the medium term, due to stricter environmental requirements, there will be a transition to gaseous fuels, which will allow us with minor structural changes to increase the power of the existing main engines and to reduce emissions of nitrogen oxides and greenhouse gases. In the long term, the transition to hydrogen fuel cells with continuous improvement of the technological level of production, storage and development of the corresponding infrastructure can be considered as a real alternative to hydrocarbon fuels in marine transport.

Introduction. Maintenance is one of the factors of elevator systems safe operation. In regulatory documents, the influence of the loading mode of elevators on the frequency of maintenance is not taken into account and is assumed to be the same for objects operating in disparate conditions. This suggests the need to determine rational intervals between maintenance to ensure safe and economically feasible operation of the equipment in question. The work objective is to substantiate the required maintenance frequency of passenger elevators based on comprehensive assessments of their technical condition.

Materials and Methods. The domestic and foreign experience of choosing the maintenance frequency of elevator units is considered. The paper evaluates the possibilities of substantiating the required maintenance intervals on the basis of established comprehensive assessments of technical condition, taking into account the conditions and operating modes. Since the problem has no direct analytical solution, an alternative approach is proposed. It is based on the hypothesis of the interrelation between the regulatory resource characteristics of assemblies and the modes and conditions of their operation. The authors obtained the necessary indicators through measurements in high-rise apartment buildings in Rostov-on-Don, experiments and adequate simulation modelling.

Results. A structural and logical model has been developed to solve this problem. It consists of procedures that can be described in detail and clarified. A method for adjusting the maintenance frequency of elevators is proposed and tested. The standards of the system resource in terms of time and number of work cycles for the control time are summarized and tabulated. In this light, the gearbox, electric motor, brake, door drive and elevator ropes in 9-storey buildings are described at a cabin speed of ≤ 1 m/s. For example, the paper provides the calculated normative indicators:

• K_{mcp норм} — coefficient of net machine time (NMT);
• n_{cp норм} — specific number of switching-on of the main drive and the door

According to the calculation results, K_{mcp норм} for the electric motor is 0.228; n_{cp норм} for the brake is 1.065 per NMT minute. To assess the overall load level, the resulting technical condition of the elevator and its main components, a single generalized indicator is proposed — the load index W_Σ. It is calculated as the sum of coefficients reflecting the relative level of load on the elevator assembly. It is established that as the resource is being depleted, while maintaining the value of time and power indicators, the estimated maintenance frequency will decrease. The recommended change threshold is 15–20 %.

Discussion and Conclusion. The developed methodology for assessing the technical condition of the elevator unit allows us to develop a complex index by which we can judge the need to revise the regulatory intervals of the elevator unit assemblies. The proposed procedures are applicable to existing, installed and designed elevators. Simulation modeling in a specially developed computer program determines the main indicators of the technical condition of the power units of the elevator: the coefficient of net machine time, switching-on specific number, the power load and the share of the expired service life. Simulation modelling also takes into account the parameters of the building: population density and random external and internal influences. The method of adjusting the maintenance frequency allows you to quickly plan and optimize the costs of operating elevator equipment without losing the level of reliability and safety.