Experimental determination of the inertia of activation of sprinklers of automatic water extinguishing systems

 

Serhij Bondarenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-4687-1763

 

Michailo Murin

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-9898-0128

 

Igor Jakovlev

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-2802-3733

 

DOI: https://doi.org/10.52363/2524-0226-2021-33-11

 

Keywords: automatic water fire extinguishing system, sprinkler, response time index, linear speed of fire development, calculated area for water consumption

 

Abstract

Experimental data on the inertia of sprinklers with a response temperature of 57 ºС were obtained, taking into account the rate of temperature rise, and an empirical dependence of the response time of a sprinkler from the moment of fire occurrence was obtained. This makes it possible to evaluate the use of this type of sprinklers for the protection of various premises, depending on the class of fire hazard. When choosing the initial data for the design of automatic sprinkler systems for water fire extinguishing, depending on the class of premises for fire hazard, two approaches are visible. For rooms of class OH, with an increase in fire hazard, the intensity of the extinguishing agent supply remains constant (I0 = 5 mm/min), and the extinguishing area for calculating the water consumption increases (Fр = 72 m2 for OH1, Fр = 144 m2 for OH2, Fр = 216 m2 for OH3, Fp = 360 m2 for OH4). For HHP premises, a different approach is taken. When designing a sprinkler automatic water fire extinguishing system, the calculated area for determining the total water consumption remains constant (Fр = 260 m2) and the intensity of the extinguishing agent supply changes (I0 = 7.5 mm/min for ННР1, I0 = 10 mm/min for ННР2, I0 = 12.5 mm/min for HHP3). However, both the first approach and the second imply that the area of fire extinguishing remains a fixed value, and the linear rate of fire development is not explicitly taken into account anywhere. Therefore, obtaining data on the response time of the sprinkler, depending on the rate of rise of the fire temperature in the protected room, will determine the minimum irrigation area of the fire center. The optimal choice of the calculated area for the water consumption when extinguishing a fire will optimize the parameters of the hydraulic distribution network, the choice of system elements, and calculate the effectiveness of the fire extinguishing system.

 

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