Test-fires to determine fire-extinguishers’ efficiency for extinguishing B class fires are conducted by operators equipped with working clothes, which does not comply with the requirements of physical modelling. This is why the ranks of extinguished modelled seats are significantly overestimated. The quantitative results of fire seats’ extinguishing can be comparatively evaluated in accordance with the value of specific flow rate of a fire-extinguishing agent. As it was detected, the specific flow rate of a fire-extinguishing agent does not actually depend on the rank of modelled fire seat when extinguished by an operator wearing thermal-protective clothes. At the same time, it is increasing along with the expansion of the fire zone scale in case the fire is extinguished without special protective clothes. Consequently, to increase the fire-extinguisher’s efficiency data reliability, the certifying tests should be conducted in conditions close to the real application conditions when the first person to firefight is not equipped with such special protective clothes.
The experimental studies to determine the specific flow rate of a fire-extinguishing agent used modelled fire seats of various ranks. The analysis of results showed that the fire-extinguishers ensuring generation of drops of prevailing size more than 0,5 mm are required to extinguish the modelled sire seats. The degree of increasing flow rate for the fire-extinguishing agent to eliminate a fire and observation of a safe distance from the flame for an operator are conditioned by the scale of fire zone and affect the specific flow rate of agent required to ensure stable fire-extinguishing. Based on the results of extinguishing the fire seats «34В» or «55В», it is demonstrated that via using a correction factor it is possible, assuming an acceptable error, to evaluate the flow rate of fire-extinguishing agent to extinguish a modelled fire seat of any rank.
2. GOST R 51017—2009. Fire engineering. Wheeled fire extinguishers. General technical requirements. Test methods. Available at: https://docs.cntd.ru/document/1200071946 (accessed: February 18, 2021). (In. Russ.).
3. SP 9.13130.2009. Fire engineering. Fire extinguishers. Requirements to operation. Available at: https://docs.cntd.ru/document/1200071152 (accessed: February 18, 2021). (In. Russ.).
4. Khil E.I., Voevoda S.S., Sharovarnikov A.F., Makarova I.P. Experimental determination of minimum discharge intensity and optimum rate of foaming agent input during suppression of oil products flame. Pozharnaya bezopasnost = Fire safety. 2015. № 4. pp. 76–81. (In. Russ.).
5. Kurbatskiy O.M., Smelkov G.I., Isavnin N.V. Methodology for evaluating the extinguishing ability for fire extinguishers. Moscow: VNIIPO, 1976. 19 p. (In Russ.).
6. Bordakov V.N. Parametric Justification for Equipping the Object with Fire Extinguishers. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2020. № 5. pp. 17–28. (In Russ.). DOI: 10.24000/0409-2961-2020-5-17-28
7. Korolchenko D.A., Volkov A.A. Extinguishing of flammable liquids by film forming foaming agents. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2017. Vol. 26. № 8. pp. 45–55. (In Russ.). DOI: 10.18322/PVB.2017.26.08.45-55
8. Abduragimov I.M. On the fire-extinguishing mechanisms in firefighting devices. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2012. Vol. 21. № 4. pp. 60–82. (In Russ.). DOI: 10.18322/PVB.2012.21.04.60-82
9. Sharovarnikov A.F., Melnikov A.I. Experimental Studies of Fire Extinguishing Capacity of the Water Film Forming Solutions Containing Fluorinated Surfactants. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2015. Vol. 24. № 9. pp. 74–81. (In Russ.). DOI: 10.18322/PVB.2015.24.09.74-81
10. Korolchenko D.A., Sharovarnikov A.F., Degaev E.N. Classification of Foaming Agents for Extinguishing of Fires of Oil Products Taking Into Account the Structure of Spreading Coefficient of Working Solution Over Hydrocarbon. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2015. Vol. 24. № 8. pp. 75–80. (In Russ.). DOI: 10.18322/PVB.2015.24.08.75-80
11. Vlasov N.A., Eremina T.Yu. Fire extinguishing efficiency of the foam generated from concentrated aqueous salt solutions. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2017. Vol. 26. № 12. pp. 52–58. (In Russ.). DOI: 10.18322/PVB.2017.26.12.52-58
12. Korolchenko D.A. The changes of combustion properties of flammable liquid at fire-extinction with water mist. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2012. Vol. 21. № 5. pp. 79–80. (In Russ.). DOI: 10.18322/PVB.2015.21.05.79-80
13. Sharovarnikov A.F., Korolchenko D.A. Impact of dispersion of water drops on the efficiency of fire extinguishing of combustible liquid. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2013. Vol. 22. № 12. pp. 69–76. (In Russ.). DOI: 10.18322/PVB.2015.24.09.69-76
14. Kuznetsov G.V., Strizhak P.A. Evaporation of Single Droplets and Dispersed Liquid Flow in Motion through High-Temperature Combustion Products. Teplofizika vysokikh temperature = The thermal physics of high temperatures. 2014. Vol. 52. № 4. pp. 597–604. (In Russ.).
15. Volkov R.S., Kuznetsov G.V., Strizhak P.A. The effects of initial parameters of water mist on the properties of its traffic through the counter-current flow of high-temperature gases. Zhurnal tekhnicheskoy fiziki = Journal of Technical Physics. 2014. Vol. 84. Iss. 7. pp. 15–23. (In Russ.).
16. Strizhak P.A., Piskunov M.V., Shcherbinina A.A. About Conditions of «Explosive» Destruction of Heterogeneous Liquid Droplet at Boiling and Intensive Evaporation in High-Temperature Gaseous Medium. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2015. Vol. 24. № 8. pp. 18–26. (In Russ.). DOI: 10.18322/PVB.2015.24.08.18-26
17. Dmitrienko M.A., Strizhak P.A., Zhdanova A.O. Features of Evaporation of Water Droplets in Flames of Typical Flammable Liquids. Pozharovzryvobezopasnost = Fire and Explosion Safety. 2015. Vol. 24. № 9. pp. 25–31. (In Russ.). DOI: 10.18322/PVB.2015.24.09.25-31