The influence of basic components of intumescent paint on fire protection properties is studied. The resulting changes in properties are assessed by the intumescence coefficient and thermal analysis data. Influence of the binder polymer composition on fire protection properties under the same conditions was evaluated, quantitatively using the example of fire-retardant water-dispersion paint; the best result was obtained in the formulation based on vinyl acetate copolymers. The brands of ammonium polyphosphate (PFA) from different manufacturers were investigated under the same conditions. The results of the thermal analysis and testing of the physicochemical properties of the samples on various PFAs are presented, with conclusions about their influence on the fire-retardant properties of the paint. The results of the thermal analysis of the influence of orthophosphoric acid, as a modifying additive, on the fire-retardant properties of the paint are presented.
Introduction. The fire resistance limits of load-bearing and enclosing structures can be identified using the method of heat-and-mass transfer calculation in case of fire. The multifactorial nature and nonlinearity of the problem makes the application of this method complicated. If necessary, the temperature regime, demonstrating the conditions of real fire, can be applied. In this work, actual fire resistance limits of metal structures of a thermal power station are calculated.Goals and objectives. The co-authors attempt to identify the actual fire resistance limits of bearing metal structures in case of the most dangerous fire development scenario.Methods. Taking into account the complexity of space-planning solutions of a building, the field-focused calculation method was selected. This method is applicable to premises, featuring complex geometric shape, where one geometric dimension is much larger than the others. Non-stationary three-dimensional differential equations of mass, momentum and energy conservation are solved for the gas medium inside a room (the Reynolds type of Navier–Stokes equations), as well as the components of the gas medium and the optical density of smoke. A heat transfer equation is solved to determine the temperature distribution inside the building structure for a one-dimensional case. The fire resistance limit of the building structure is identified as the moment in time following the start of fire, when the temperature in, at least, one point of the structure reaches a critical value.Results and discussion. Calculation results show that in case of the most dangerous fire development scenario, within 15 minutes as of the start of fire, maximum temperatures of load-bearing metal structures are far below the critical temperature of 500 °C.Conclusions. Load-bearing metal structures in an engine room, that has steam turbines, don’t need fire protection.
The paper analyzes the compliance of products with the requirements of the "Technical Regulations on Fire Safety Requirements". In the conditions of rapid growth of industry, production and output of products using new technologies with the use of new substances and materials, there is a need for the state and society to respond adequately to all kinds of risks that may arise in the use of products, especially if such products are subject to mandatory requirements. One of the types of such products is fireproof paints, varnishes and coatings - Fire Retardant Coatings (hereinafter – FRC). Application of FRC is based on increasing the fire resistance of building structures to the level regulated by the existing regulations depending on the degree of fire resistance of the building. Frequently, problems with FRC quality are only detected at the stage of checking the performance of fire protection works when applying FRC which do not meet the fire safety requirements.
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