Investigation of the characteristics of the internal firefighting water pipeline elements
An important task in the design of buildings for different purposes is ensuring the safety of people's livelihoods. To protect them from the negative factors of fire, various devices are used to localize and stop burning. One of the elements of the fire protection of the building is the internal firefighting water supply. For the supply of water to extinguish a fire, it is provided for the installation of firefighting hydrants sets with a diameter of 25 and 33 mm. To date, there is no clear procedure for selecting fire hydrant equipment of small diameter for different types of buildings. To formulate the requirements for them, the influence of various factors on the actual flow of water is investigated. According to the results of the experiment, empirical dependences of water consumption for semi-rigid hoses are obtained. Analysis of the simulation results shows that the actual flow of water from a fire hydrant largely depends on the pressure in the network and the diameter of the hose.
A comparison of actual water consumption with regulatory data is done. The inexpediency of the use of equipment, whose characteristics do not provide the necessary indicators, is shown. A 3-step procedure for selecting the characteristics of a fire hydrant is proposed, including determining the flow rate of water from a fire hydrant for semi-rigid hoses of different lengths, degree of deployment and arbitrary pressure values in the water supply network. The result is compared with the standard value. The proposed procedure allows to reasonably choose the equipment that can ensure the successful extinguishing of the fire. Its practical value is reducing the flow of water to extinguish a fire and reduce material losses
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