REGARDING THE DETERMINATION OF THE NECESSARY AREA OF EASY-DROPPED CONSTRUCTION

Abstract

The article provides a practical example of determining the required area of easy-dropped construction (hereinafter – EDC) for an explosive room in accordance with the requirements [1]. In particular, examples are given for determining the maximum normal speed of flame propagation in a mixture of gases, the degree of compression of combustion products during an explosion in a closed volume with the concentration of a combustible substance that corresponds to the lower concentration limit of flame propagation, the degree of compression of combustion products during an explosion in a closed volume with a concentration of a combustible substance that corresponds to the maximum normal speed of flame propagation, the coefficient of the degree of filling the volume of the room with a fire-explosive mixture and its participation in the explosion, the value of the combustion intensification indicator, the coefficient that takes into account the degree of filling of the object of the room with a fire-explosive mixture , the density of the combustible medium at a certain concentration of the combustible substance. An action algorithm was established during the assessment of the required area of the EDC, which includes: determination of the need to install the EDC; determination of the category of premises, buildings according to explosion and fire hazard; verification of the conditions of use of the calculation method; calculation according to [1]; verification of safety conditions by comparing the required and actual area of the EDC, taking into account the safety factor. It was determined that the calculation of the EDC area can be carried out under the conditions that the speed of flame propagation does not exceed 65 m/s, there are no detonation processes, dust of inorganic substances and metals does not participate in the explosion, the linear dimensions of the explosive room in length, width and height are not are more than 10 times different from each other, and the openings in the elements (walls, covering) of the outer enclosure of the explosive room are placed fairly evenly or near the possible ignition point of the combustible mixture. The considered method is used during the design and construction, reconstruction, restoration, capital repair of explosion-proof and fire-hazardous premises and buildings in terms of equipping them with EDC during testing, as well as during the development of regulatory and technical documentation for EDC. The required area of the EDC for a warehouse with dimensions of
15 m x 10 m x 5 m, in which cylinders with propane-butane are stored in the event of a gas leak in the amount of 21.2 kg, is determined.