Abstract
The aim of the work was to conduct experimental studies aimed at determining the protection factor of the filter respirator with forced air supply by volunteers in different modes of operation and to establish the dependence of the amount of air supplied by the fan from the air purification device to the filter’s resistance. Simulation studies to determine the protective effectiveness of the filter respirator on the testers were performed according to the procedure for determining the penetration coefficient of test aerosol – sodium chloride, as the ratio of the submask concentration of test aerosol to the ambient concentration formed in a special chamber that meets the requirements of DSTU EN 13274. Determination of the amount of air supplied by the air purification unit to the submask space and assessment of the value of positive pressure inside the mask was performed according to the procedure described in DSTU EN 12941: 2004. As a result of simulated laboratory tests to determine the protective effectiveness of filter respirators with forced air supply to the testers, it was found that the average result of the protection factor of the test samples ranged from 99.93 to 99.97, which meets the requirements of DSTU EN 12941: 2004. In addition, it was found that the amount of air treated by the fan of the air purification device for clean filters is 165 and 215 dm3/min for operating modes “Normal” and “Turbo”, while for the polluted filters it is reduced to 131 and 185 dm3/min, respectively. During the study, the compliance of the value of excess pressure in the submask space with the requirements of DSTU EN 12941: 2004, which should not exceed 2.5 mbar, was confirmed. It is also determined that the stability of the technical parameters of the air purification device is maintained in the specified range when charging the “Dinogy Li-Pol 11000mAh 14.8V 4S 25C” brand battery not less than 12 V to ensure the current value of not less than 1.6 A. The practical value of the results lies in determining the duration of protective action of the filter respirator, the choice of filter resistance to establish the scope and modes of operation in the developed personal respiratory protection equipment.
Highlights
Powered air-purifying respirators (PAPR) with forced air supply are characterized by a number of advantages in comparison with filtering personal respiratory protection equipment (PRPE) working on a negative pressure differential
The research was based on the experimental test procedure, which included determining the penetration and protection coefficients of the filter respirator with forced air supply by test aerosol – sodium chloride on test volunteers, determining the flow of air supplied by the air purification unit to the submask space and determining the positive pressure inside the helmet or hood in accordance with the Employees of the Department of Occupational Safety and Civil Safety of the National Technical University “Dnipro Polytechnic” for the first time created a similar filter powered PRPE, which includes a mask with an obturator, inhalation and exhalation valves, flexible corrugated air duct connected to an air purifier with filters, in which a fan, a control unit and power supply unit are placed (Fig. 1)
The test of the protective efficiency of the filter respirator with forced air supply was performed on a special stand (Figure 2), which meets the requirements of the standard DSTU EN 13274-1: 2005
Summary
Powered air-purifying respirators (PAPR) with forced air supply are characterized by a number of advantages in comparison with filtering personal respiratory protection equipment (PRPE) working on a negative pressure differential. First of all, such respirators have a much higher degree of protection In some countries of the world, including the USA, Great Britain, Japan, South Korea, the industry manufactures several types of the considered devices Their design consists of the following elements – a protective mask (half mask, hood, helmet-mask), which is connected by a flexible air duct with an air purifier equipped with one or more filter elements.
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