ANALYSIS OF STRUCTURAL COMPLIANCE AND BASIC TECHNICAL REQUIREMENTS FOR LAYFLAT FIRE HOSES FOR FIRE-RESCUE EQUIPMENT

Abstract

The urgency of the study of modern requirements for structural design, as well as the basic technical requirements for layflat fire hoses for fire-rescue equipment are given. To date, in Ukraine the requirements for design and basic technical requirements for fire delivery hoses for fire-fighting equipment are given in DSTU 3810-98. Given that the requirements of the national standard DSTU 3810-98 to some extent obsolete and do not meet the practical needs of today, and given the recent emergence of new types of fire hoses in the leading countries of the world, it is an urgent question to study modern requirements for structural performance, as well as the basic technical requirements for layflat fire hoses for fire fighting equipment. A report on the research work of the Ukrainian Civilian Research Institute on the development of a national standard for fire hose specifications in 1998 shows the results of studies to justify the technical requirements for delivery hoses. At the same time, these studies do not reflect the current state of play regarding the design of these products. In order to solve this problem at the Ukrainian Research Institute of Civil Protection, a research work is being conducted “Grounding of fire hoses test methods”, within which a national standard will be established that will establish, in particular, modern scientific substantive requirements for structural design and basic technical requirements for the layflat delivery fire hoses for fire and rescue equipment. Pressure fire hoses are flexible pipelines that are used to supply water and aqueous solutions of foaming agents over a distance under pressure. The main requirements for delivery fire hoses are the requirements for flexibility, tightness, wide temperature range of operation and, of course, the requirements for ensuring their durability and durability. To ensure the outlined requirements, the delivery hoses are made of elastomeric materials that are reinforced with cord. Usually, they have a composite multilayer inner structure characterized by the presence of an inner and, sometimes, an outer rubber layer, as well as the presence of one or more layers of textile frame. The presence of the frame can significantly increase the strength (and, consequently, increase the allowable operating pressure), as well as provide the necessary stability and radial rigidity of the hose. Modern approaches to the design of delivary fire hoses have been analyzed. Keywords: fire-rescue equipment, layflat delivery fire hoses, structural design, technical requirements.