Study of aerodynamic breathing resistance of dust respirators
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Authors:
V.I. Holinko, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Aerology and Labour Protection Department, Dnipropetrovsk, Ukraine
S.I. Cheberiachko, Cand. Sci. (Tech.), Associate Professor, State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Aerology and Labour Protection Department, Dnipropetrovsk, Ukraine
D.I. Radchuk, State Higher Educational Institution “National Mining University”, Senior Lecturer of the Aerology and Labour Protection Department, Dnipropetrovsk, Ukraine
Yu.I. Cheberiachko, Cand. Sci. (Tech.), State Higher Educational Institution “National Mining University”, Senior Lecturer of the Aerology and Labour Protection Department, Dnipropetrovsk, Ukraine
Abstract:
Purpose. Determination of the basic laws affecting the ergonomics of dust respirators.
Methodology. The evaluation of pressure difference in the respirators was carried out in accordance with DSTU EN 149:2003 (for non-reusable half masks) and DSTU EN 140:2004 (for reusable half masks). Change of pressure was determined using the special electronic gauge Testo 512. The load was simulated using the treadmill Proteus CBM-1050. The display of the treadmill shows all the parameters needed for the study (testing time, heart rate of the tester and load).
Findings. According to the DSTU EN 149:2003 we have designed the stand for determination of the breathing resistance of the dust respirators in conditions when the tester is subject to different load. We have found that the external respiration during light work can be described as harmonic vibrations, while the pressure difference in the respirators during heavy work leads to significant distortion. The proposed theoretical relationship between the pressure difference in the respirator and air velocity during inspiration and expiration does not take into account the effect of clearance pocket, changes of body position, air temperature, and uneven distribution of velocity on the filter area.
Originality. We have found that pressure drop through non-reusable filtering half masks at breathing performing light work can be described by a harmonic law, while pressure drop determination during heavy physical activity leads to significant distortion.
Practical value. We have determined of pressure drop in the dust respirators during activity of different intensity at pulsating flow. This helps to clarify the process of the pressure drop testing of the filtering half masks.
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