PERSPECTIVE DIRECTION OF CALCULATION AND DESIGN OF REINFORCING CARCASSES OF TENSION FIRE HOSES ON BASIS OF SYNTHETIC FIBERS

Abstract

The physical and chemical properties of synthetic fibers of various compositions for reinforcing carcasses of pressure fire fibers, and their appointment and structure were denoted. It is noted that due to the effect of negative factors (mechanical wear, impact of low and high temperatures, the action of sunlight, aging of the material, accidental release of chemically active substances, etc..) on pressure fire hoses at their exploitation, increased demands are imposed on the material of synthetic fibers of pressure fire hoses, the most important of which is resistant to abrasion. The use of pressure fire hoses from polyester fibers based on PET shows that the main reason for breaking up the fibers at their exploitation is abrasion of the surface. In this regard, the use fibers of ultrahigh molecular weight polyethylene (UHMWPE fibers) and fibers of PET, polyamide 66 (PA-66) having high strength and abrasion resistance as a material of reinforcing carcass of pressure fire hoses was proposed. It is extremely important to  develop and improve of the calculation theory and design of fire hoses in hydraulic impact, which will be demand in the calculation and design of new types of pressure fire hoses on the basis of synthetic fibers, as well as to identify reasons for breaking of pressure fire hoses to extinguish the fire, to create a new high-pressure fire hoses. In this regard, the brief analysis of publications on their strength calculation at the hydraulic impact was carried out and achievements in the field of calculation and design of reinforcing carcasses of fire hoses were denoted.