Abstract
Experimental studies are presented and the dependence of the change in the strength of the material of a pressure head fire hose of type T with an inner diameter of 77 mm in the longitudinal direction is established, taking into account single damages. The work describes the plan of the experiment and carried out a number of field experiments to determine the effect of the length ld and the depth K damage on the strength F of the hose material, that is, obtaining the dependence F=f (ld, K). A mathematical method of experiment planning was used and a plan was drawn up for a complete multivariate experiment of type 2k with an acceptable model accuracy of 5 %. The limits of variation of the factors are set taking into account a priori information, experimental capabilities and on the basis of the results of preliminary search experiments. The dependence in the coded and natural values of the factors is obtained. The reliability of the relationship was checked using the Fisher test, the calculated value of which was 5.98, which confirms the adequacy of the described process with a probability of 95 %. Analyzing experimental studies of the dependence of the change in the strength of the hose material on the length and depth of damage, it can be said that the change in the strength of the hose almost linearly depends on the specified damage parameters. It is found that with increasing damage, the strength of the hose material significantly decreases. When varying the length factor and the greatest depth of damage, K=0.4 mm, the strength of the hose material decreases from 11.67 kN to 8.77 kN, and in percentage terms by 25 %. The results obtained can be used in practical units of emergency rescue teams, when diagnosing hidden damage in pressure head fire hoses in order to prevent their failure in case of fires
Highlights
Ensuring the safety of the population is one of the main functions of any country in the world
Among hazardous events and emergencies, the highest frequency of fires. When extinguishing fires, such a factor is important as the time it takes to complete certain stages of operational work, which depends on the level of readiness of forces and means
The aim of research is to establish the dependence of the change in the strength index of the material of the pressure head fire hose on tension in the longitudinal direction, depending on the nature of single damage by conducting field experiments
Summary
Ensuring the safety of the population is one of the main functions of any country in the world. Among hazardous events and emergencies, the highest frequency of fires When extinguishing fires, such a factor is important as the time it takes to complete certain stages of operational work, which depends on the level of readiness of forces and means. The level of readiness of forces and means to carry out actions as intended is a complex criterion that takes into account various possible indicators These indicators include: the probability of the readiness of a sufficient amount of equipment, the time required to complete certain types of operational work by the unit, as well as the likelihood of failure-free operation of fire-fighting equipment. There is a problem in the low reliability of pressure head fire hoses and their sudden destruction when extinguishing fires, which is accompanied by an increase in losses This creates an additional danger for the personnel of civil protection units who are involved in extinguishing fires
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