An internal gas explosionin an enclosed space causes a rapid increase in temperature and pressure, leading to structural damage and potential danger to personnel. Factors such as the type of gas, room geometry, ignition sources and ventilation significantly affect the intensity of the explosion. Impacts on industrial halls include deformation or damage to structural elements (columns, beams, walls), potential collapse of the roof or entire structure and damage to contents. Personnel may be injured or killed by shock waves, debris, thermal burns and barotrauma. Eurocode 1991-1-7 provides guidance on the design of structures to protect against accidental actions, in particular internal gas explosions. The standard emphasizes hazard identification, explosion scenario analysis and determination of the effects of explosion loading (peak overpressure, pulse duration). The design of the structure must ensure resistance to progressive collapse through the selection of materials and details. Explosion protection measures include ventilation systems, gas detection, pressure vents and explosion isolation systems. This paper presents one method for checking the stability of a structure under accidental design loads. An internal gas explosion was considered. The calculations were carried out in accordance with EN 1991-1-7: Eurocode 1: Actions on structures - Part 1-7: General actions - Accidental actions. The theoretical issues, the calculation procedure and a calculation example are presented. The calculations are based on the example of a small industrial hall with a steel structure of 15 × 12 × 6 m. The structure is classified as consequence class CC2. Pressure loading due to an internal gas explosion was carried out using an equivalent static load model.