The urgency of the development of the corresponding national standard, which regulates the technical requirements and test methods for the layflat delivery fire hoses for fire vehicle. Currently, the Operative Rescue Service mainly uses pressure hoses of the “T” type (for fire vehicle ) with a diameter of 51 mm and 77 mm, the technical condition of which often does not meet the requirements, which may not withstand the pressure that pumps of even traditionally used fire vehicle develop when extinguishing fires. The use of such hoses in extinguishing real fires can limit the ability, reduce the effectiveness of operational and tactical operations of operational and rescue units, as well as put personnel at risk. Today, there are a number of complaints from Civil Protection Operations and Rescue units regarding substandard fire hoses being purchased and operated. Basically, the complaints concern the non-conformity of these products with respect to the pressure requirements and the wear resistance of the surface of the material from which it is made. Over the past three years, the State Emergency Service has purchased about 120 fire vehicle each year, which are completed with fire delivery hoses with diameters of 51 and 77 mm. The requirements of the current national standard DSTU 3810-98 in Ukraine are outdated and do not meet the practical needs of today. Taking into account that new types of fire hoses and technologies of their creation have appeared in the leading countries of the world, and considering that the standard in Ukraine DSTU EN 15889: 2017 does not apply to layflat delivery fire hoses for fire vehicles, the issue of developing a national standard for this type of fire hose is urgent. In addition, European regulatory document CEN / TR 16099 states that the EU does not have a single standard that sets the technical requirements for "flat-fire attack hoses", ie those used with fire-fighting pumps. In EU countries, this issue is likely to be governed by the individual national standards of the Member States. This is confirmed by the German national standard DIN 14811-2008 / A1-2012, A2-2014. The technical characteristics and test methods of fire hoses in accordance with current DSTU 3810-98 and German standard DIN 14811-2008 are given. On the basis of analytical research the methods of testing layflat delivery fire hoses are specified, which will be given in the draft national standard. Keywords: layflat delivery fire hoses, rescue vehicles, specifications, test methods.

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.

Among the technical means intended for transportation of fire extinguishing substances to the fire center, the main role is definitely played by delivery fire hoses. At present, the Civil Protection Rescue Service units use mainly pressure fire hoses type "T" (for fire-rescue vehicles) with a diameter of  51 mm and 77 mm, the technical condition of which often does not meet the established requirements, which may not withstand the pressure developing pumps, even traditionally used fire-rescue vehicles during firefighting. The use of such hoses in extinguishing real fires can lead to limited opportunities, reduce the effectiveness of operational and tactical actions of the Civil Protection Rescue Service units, as well as expose personnel to danger. The requirements of the State Standard of Ukraine 2273:2006 in Ukraine are outdated and do not meet the practical needs of today. Given the fact that in the leading countries of the world there are new types of fire hoses and technologies for their creation, as well as due to the fact that adopted in Ukraine State Standard of Ukraine EN 15889: 2017 does not apply to fire-fighting layflat delivery hoses for fire-rescue vehicles, the issue of developing a national standard for this type of fire hoses is relevant. In addition, the European normative document CEN / TR 16099 states that there is no single standard in the European Union that would establish technical requirements for "fire-fighting layflat delivery attack", ie those used with fire and rescue vehicle pumps. In EU countries, this issue is regulated by separate national standards of member states. Confirmation of this approach is the German national standard DIN 14811-2008 / A1-2012, A2-2014. The urgency of developing a national standard regulating the general technical requirements and test methods for fire-fighting layflat delivery hoses for fire-rescue vehicles is given. The modern approaches of the European Union to the establishment of technical requirements and methods for assessing the quality of such hoses are analyzed. The possibility of applying these approaches at the national level has been identified. .

The urgency of the necessity of experimental substantiation of quality indicators of the fire-fighting layflat hoses for fire – rescue equipment and methods of their estimation is noted, taking into account the modern approaches set out in European standards. The results of experimental researches of fire-fighting layflat hoses for fire – rescue equipment by quality indicators are presented: resistance of the hoses to the action of working hydraulic pressure, resistance of the hoses to the action of the proof hydraulic pressure, burst pressure and abrasion resistance. Delivery fire hoses are one of the main types of fire fighting equipment. Delivery fire hoses in the course of operation undergo mechanical wear, are exposed to the sun's rays, microbiological putrefactive processes, accidental ingress of chemically active substances, the influence of low and high temperatures, irreversible processes of material aging. All this causes the appearance of defects of different nature. Analysis of the causes of failure of delivery fire hoses showed that of all failures more than 60% are fistulas, as well as breaks and disruptions of heads - 30% and 10% respectively. The analysis of the presence and nature of defects during the regular testing of workers and decommissioned fire hoses showed that the defects are divided into: explicit (gusts and fistulas) that violate the tightness of the hoses; visible cuts, abrasions, missing and chemical corrosion from contamination of fuel and lubricants that do not violate the tightness of the hoses; hidden (unnoticed cuts, breaks in the threads of the power frame, etc.) that do not violate the tightness of the hoses. Studies have shown that only 75% of defects are detected during hydraulic testing, and undetected defects result in hoses failing in a fire. To date, requirements for assessing the quality of delivery fire hoses for fire - fighting equipment in Ukraine are set out in the standard DSTU 3810-98. At the same time, these requirements are to some extent obsolete and do not meet the current regulations of the leading countries in the world on this issue. In view of the above, it is urgent to experimentally justify the quality indicators of the fire-fighting layflat hoses for fire – rescue equipment and methods of their evaluation, taking into account the modern approaches set out in European standards. The results of the pilot studies will be used to justify the provisions of the draft national standard of Ukraine that will be developed and to improve the existing test base. Keywords: abrasion, burst pressure, experimental research, fire – rescue equipment, layflat delivery fire hoses,, proof pressure, quality indicators, technical requirements, specifications, working pressure

The urgency of the issue of substantiation of technical requirements to fire-fighting layflat delivery hoses for fire-rescue equipment is given. Fire hoses are a significant component of fire fighting equipment. According to DSTU 2273, a fire hose is a flexible conduit fitted at the ends with connecting heads intended for the transport of extinguishing agents. Among the technical means intended for the transportation of extinguishing agents to the fire cell, the main role is certainly played by delivery fire hoses. According to DSTU 2273 delivery fire hoses (in EU countries they are classified as "layflat") are intended for transportation of extinguishing agents under excess pressure. At present, there are a number of standards in Ukraine and in the leading countries of the world that set the technical requirements for delivery fire hoses, in particular those used in conjunction with fire rescue equipment, namely DSTU 3810-98, DIN 14811, EN 14540: 2004 + A1: 2007, etc. In addition, a draft state standard is being developed in the Republic of Belarus. Considering the process of gradual integration of Ukraine into the European Union and the fact that the requirements of the current national standard DSTU 3810-98 do not meet the modern European requirements for layflat delivery hoses for fire-fighting equipment, a pressing issue is the justification such types of hoses. In order to assist in solving this problem, the Ukrainian Research Institute of Civil Protection is currently conducting a research work "Justification of fire hose test methods", within which a national standard will be developed, which regulates general technical requirements and test methods for the fire-fighting layflat hoses for fire – rescue vehicles. The basic technical requirements for the specified hoses, which meet the modern requirements of the EU and which, after appropriate experimental justification, can be considered in the draft national standard, which regulates the general technical requirements and test methods for the fire-fighting layflat hoses for fire – rescue vehicles to be developed. This publication lists six tables that provide basic specifications for delivery fire hoses. Keywords: abrasion, burst pressure, layflat delivery fire hoses, fire – rescue vehicles, proof pressure, technical requirements, specifications, working pressure.