Foam generator of the fire nozzle SPRUK 50/0,7 «Viking»

Abstract

Purpose. The study of the dependence of the multiplicity of the generated air-mechanical foam on the cell area of the foam generating grid of the foam generator SPRUK 50/0,7 «Viking».

Methods. Experimental studies were carried out on the basis of the University of Civil protection of the Ministry of Emergency Situations of the Republic of Belarus in accordance with the requirements of STB 11.13.14-2009 Manual fire nozzle. General specifications.

Findings. It is established that the foam generator can supply not only foam of low multiplicity (K ≤ 20), but also foam of average multiplicity (K = 25). However, the foam of medium multiplicity is generated at low flow rates (0,5 and 1 l/s) of the foamer solution when using grids with a cell area of 0,5 mm². In addition, the foam rate has a significant influence on the foam multiplicity. When the consumption of foaming agent solution increases, the foam multiplicity for grids with a cell area of S ≤ 1 mm² decreases, and of S ≥ 4 mm², on the contrary, increases.

Application field of research. Extinguishing fires with air-mechanical foam using a fire nozzle FMUCN 50 / 0,7 «Viking».

Conclusions. In the course of experimental studies of prototypes of the foam generator it was established that the most optimal sample is a foam generator with a grid having a cell area of S = 4 mm². Equations are obtained for determining the multiplicity of the foam as a function of the consumption of the foaming agent solution for various grids. It has been established that if the area of the cell of the foam generating grid is S ≤ 1 mm², then with increasing consumption of the foamer solution, the multiplicity of the generated foam falls, but by S ≥ 4 mm², on the contrary, it increases.