Definition of elastic properties of fire hoses of type "T" with a diameter of 51 mm under torsion

Abstract

It is found that mechanical properties, including torsional rigidity of a fire hose, determine it’s long-term safe operation. The paper contains results of experimental studies, namely the elasticity properties of the fire hose and torsional rigidity. Research was carried out at an internal pressures of 0.2 Mpa, 0.6 Mpa and 0.4Mpa in a hose that was provided by the compressor. Five loading cycles with two minute intervals were held. The loading was measured via dynamometer. Experimental fragment of the fire hose with an inner diameter of 51 mm and testing length of 0.985 m was set on a research facility and a series of tests were held. The results show material stabilization on the 3rd cycle of loading. Experimental results are presented graphically by curves. As a result of present work the torsional rigidity of the fire hose of type "T" with an inner diameter of 51 mm is determined. The obtained results will be used to estimate the residual life of the fire hose