DETERMINATION OF THE ACTUAL VALUES OF HYDRAULIC BRANCH RESISTANCE AND LIQUID CONSUMPTION OF STANDARD FIREBUSES

Abstract

Knowledge of actual flow rate, fire extinguishing fluid is necessary for calculations of pump and hose systems, costs and time of water supply for fire extinguishing of tactical capabilities of fire departments, calculations of internal fire-fighting water supply systems. The difference between the reference values of the water supply and the jet does not allow accurate calculations, which can significantly affect the effectiveness of fire departments.

It is not possible to calculate the flow loss when the branching is used, since these values of hydraulic branching resistance are missing or not specified and there is some difference in the flow rate of the fluid from the trunks with different diameters and jets. Therefore, it is important to establish the actual data of the values of hydraulic branching resistance at increased head and fluid flow using barrels of different diameters. To conduct such experiments, it is necessary to establish appropriate schemes using barrel gauges, Pitot tubes, pressure gauges and calculation methods.

The study is conducted in three stages. During the first phase, investigate the indices of branching pressure and water loss using a single outlet nozzle d-51mm. branching RT-80 when using trunks of different diameters. In the second stage, using two output nozzles d-51mm. and d-77mm.  In the third stage, using three output nozzles d-51, d-77, d-51 mm. The results of the study will allow the calculation of the head and fluid loss when using branches with trunks of different diameters. The obtained values of the actual branching costs can be used in the calculations of pumping and hose systems, the range of flow and fluid consumption for the needs of fire fighting, the time of water supply, the tactical capabilities of fire departments, as well as the calculations of internal fire-fighting water systems.