On the effectiveness of fire extinguishing with low-multiplicity air-mechanical foam formed by foam generators
DOI:
https://doi.org/10.33408/2519-237X.2023.7-4.355Keywords:
foam generator, foam multiplicity, air-foam nozzle, foam extinguishing, extinguishing efficiency, extinguishing time, fire extinguishing agent consumptionAbstract
Purpose. To develop methods and conduct full-scale tests of foam generators. To perform a comparative assessment of the effectiveness of extinguishing foam formed by each of the generators basing on test results.
Methods. The evaluation of the effectiveness of extinguishing with foam formed by foam generators was carried out experimentally, and the processing of the experimental data obtained was carried out using the method of estimation and expression of measurement uncertainty.
Findings. The methods of full-scale tests to determine the effectiveness of extinguishing foam formed by foam generators have been developed. The full-scale tests of three foam generators used in the Republic of Belarus have been carried out: air-foam barrel (hereinafter referred to as SVP), water-filled nozzle for the SRK-50 fire barrel (hereinafter referred to as NVP-11/0.6 U1) and air-foam nozzle for the SPRUK 50/0.7 fire barrel (hereinafter referred to as VPN SPRUK 50/0.7). To compare the effectiveness of extinguishing with foam, the Et extinguishing efficiency indicator was used, taking into account the extinguishing time of the model fire source and the consumption of extinguishing agent. As a result of full-scale tests, it was found that the foam generated by the VPN SPRUK 50/0.7 has 7.5 and 10 times greater fire extinguishing efficiency compared to the SVP barrel and 8.8 and 1.2 times compared to the NVP-11/0.6 U1 when extinguishing a model hearth of classes A and B, respectively. Also, NVP-11/0.6 U1 when extinguishing Class B fires has a higher (at least 9 times higher) extinguishing efficiency than SVP.
Application field of research. The developed methods of field tests to determine the effectiveness of extinguishing foam generated by foam generators can be used in the development of domestic technical regulations in this area, as well as for the study of other foam generators in conditions close to a real fire.
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