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Protection of buildings against consequences of gas explosion indoors by means of the safety designs (SD) is widespread. In a number of the regulating documents requirements to these designs are imposed. It agrees, the regulating documents are allowed to carry out calculation of system of protection against internal explosion by means of the safety designs. The key sizes determining the area of apertures of the blocked safety designs are: speed of explosive combustion, most allowed explosion pressure, unit weight (per acre) the safety designs and pressure of opening of the safety designs. Under pressure openings it is meant pressure with which communications of the safety designs with walls of the building collapse and the safety designs starts moving. Depth of seal of the safety designs in an aperture remains out of sight and is supposed what influences the end result a little. In the real article an attempt to deal with this question is made. As a result of the conducted researches it was established that depth of seal of the safety designs in an aperture has to be considered when calculating system of protection of buildings against internal explosion by means of the safety designs. Especially it is important for rooms of small volume of V 0 ≤120 of m 3 . For the analysis of explosion in the production buildings it is necessary to consider the volume of these rooms and a possibility of increase in burning rate because of existence of barriers indoors.

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About dependence of parameters of internal explosion on the device of safety designs in apertures of the protecting walls of the production and residential buildings