Improvement of supply of gel-forming compositions by extinguishing unit with elongated crankshaft

Kostiantyn Ostapov

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-1275-741X

Iurii Senchykhin

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-5983-2747

Vadim Avetisyan

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-5986-2794

Ihor Gritsina

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-2581-1614

DOI: https://doi.org/10.52363/2524-0226-2022-35-7

Keywords: gel-forming compositions, elongated barrel, extinguishing unit, finely sprayed jet, model hearth

Аnnotation

This new installation allows extinguishing with gel-forming compounds from a distance of 3–5 m to the center of the fire, ensuring the safety of firefighters. A full-scale sample of the original two-knee sprayer of the knapsack installation was designed, manufactured and tested. Experimental studies have shown that its use due to compactness in the folded state and ease of deployment in the working position, provides ease of transportation and efficiency of operation in rapidly changing fire conditions, especially in high-rise buildings. With the supply of gel-forming compositions in finely divided form, a reduction in their cost for extinguishing the hearth is achieved, compared to previously proposed technical solutions, 1,5 times. To determine the effective value of the dispersion and intensity of spraying of gel-forming compositions in mathematical models of the cost of extinguishing the model hearth and the time of its extinguishing, polynomials of the second degree are used. Unknown coefficients are determined by the standard least squares method. As a result, rational values of droplet diameter (1 mm) and feed intensity (0,6 l/s) of gel-forming compositions were determined, which provided the technical optimum of their use. Thus, it was found that the parameters of extinguishing the model hearth 1A finely sprayed gelling compositions correspond to a total consumption of 2,5 kg, which is 3,5 times less than water.

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