Estimation of required capacity of emergency ventilation for industrial rooms having explosion and fire hazard
Authors: Шебеко Юрий Николаевич , Леончук Петр Алексеевич 
Published: September 2022

Проанализированы СП 60.13330.2020 «Отопление, вентиляция и кондиционирование воздуха» и СП 12.13130.2009 «Определение категорий помещений, зданий и наружных установок по взрывопожарной и пожарной опасности» относительно расчета требуемой производительности аварийной вентиляции для взрывопожароопасных производственных помещений. В соответствии с п. 7.7.8 СП 60.13330.2020 производительность аварийной вентиляции должна обеспечивать непревышение концентрацией горючего газа или пара в удаляемом воздухе 50 % от нижнего концентрационного предела распространения пламени. СП 12.13330.2009 регламентирует требования к производительности аварийной вентиляции, обеспечивающей непревышение расчетным избыточным давлением взрыва величины 5 кПа. Проведено сравнение указанных выше величин производительности для типичного производственного помещения. Показано, что оборудование помещения аварийной вентиляцией, выполненной в соответствии с СП 12.13130.2009, обеспечит соблюдение требований, регламентированных СП 60.13330.2020.

According to paragraphs 48, 49 of the Federal Law on 22 July 2009 No 123-FZ “Technical regulation on fire safety” an emergency ventilation of industrial rooms is an important component of fire safety provision. The emergency ventilation is aimed at prevention of formation of explosive mixtures at an accidental release of flammable gases and vapors into the technological equipment. The emergency ventilation should have a required capacity. In Russian Federation the requirements to the value of this capacity are stated in the normative documents SP 60.13330 and SP 12.13130. The requirements of SP 60.13330 are aimed at prevention of the formation of flammable mixtures in which the average concentrations of the flammable gases and vapors at their accidental release across a room volume is higher than 50 % from a lower flammability limit (capacity L). The emergency ventilation should be turned on a signal from a gas detection system when reaching the concentration of 10 % from the lower flammability limit, have a back up ventilator and an energy supply according to the first reliability category. The requirements of SP 12.13130 are aimed at fulfillment of condition that an estimated explosion pressure in the room should not exceed 5 kPa at a maximum design accident (capacity L). This ventilation also should have a back up ventilator and an energy supply according to the first reliability category. It is interesting to compare these values for a typical industrial room using the maximum design accident of the release of petrol. It was found that a ratio of L/L is lower than 0.2 that is the emergency ventilation capacity determined from SP 60.13330 is not sufficient to satisfy the requirements of SP 12.13130. This fact should be taken into account during designing of ventilation systems. This conclusion was made for a specific case of petrol. This liquid is typical for an industry and the difference between the values L and L is rather large. Therefore the above stated conclusion should be valid for other flammable liquids using in industry.