Experimental Research of Geometric Parameters Change of the of Fire Hoses When Using the Protek 366 Nozzle

Abstract

Main hose lines are usually laid to transport water and working solutions of foaming agents to the centre of the fire when extinguishing large fires or fires with hydrants for remote control. Their components are separate pressure fire hoses and they come in different diameters. As a result of their operation during the fire extinguishing substances transportation, fire hoses change their geometric parameters primarily their length. For different types of hoses and their different diameters, it has been established that their elongation occurs under hydrodynamic pressure. In some cases, when using a plug at the end of a fire hose, the relative elongation coefficient of fire hoses was 1,04. 3 types of hoses were used for the research: latex fire hoses with diameters of 51 mm and 77 mm type T and fire hoses with double-sided polymer coating with diameters of 51 mm type T. All hoses were previously used during the real work of fire calculations. The results presented in the paper are an averaging of each of the three hose types. The experiments were carried out under typical conditions in the open air using a Protek 366 fire barrel under constant fluid flow and different pressure values at its inlet. Fire hoses were placed on a horizontal surface. The elongation of fire hoses when they transport water depends on the physical and mechanical properties of the materials from which they are made, the pressure of the liquid at their inlet and consumption. The maximum elongation (62 cm with a hose length of 1960 cm, the relative elongation was 0,032) was recorded when transporting water with a fire hose in diameter of 77 mm at a pressure at its inlet of 1,0 MPa and a flow rate of 1,9 l/s. The questions of the change in head loss along the length were not considered. There were no significant changes in the diameters of fire hoses.

Determining the elongation of T-type pressure fire hoses based on full-scale experiments

“…At the next stage of research, the hoses transported water to a fire barrel at an ambient temperature of 298 K. The fire barrels Protek 366 (Fig. 3) [17] and RS-70 were used. At this stage of research, the initial length of the PFH was 1790 cm.…”