The data must reflect workplace conditions closely resembling or with a higher exposure potential than the processes, types of material, control methods, work practices, and environmental conditions in the employer's current operations. Objective data means information, such as air monitoring data from industry-wide surveys or calculations based on the composition of a substance, demonstrating employee exposure to respirable crystalline silica associated with a particular product or material or a specific process, task, or activity. High-efficiency particulate air filter means a filter that is at least 99.97 percent efficient in removing mono-dispersed particles of 0.3 micrometers in diameter. Employee exposure means the exposure to airborne respirable crystalline silica that would occur if the employee were not using a respirator. The competent person must have the knowledge and ability necessary to fulfill the responsibilities set forth in paragraph (g) of this section. Competent person means an individual who is capable of identifying existing and foreseeable respirable crystalline silica hazards in the workplace and who has authorization to take prompt corrective measures to eliminate or minimize them. Department of Health and Human Services, or designee. Director means the Director of the National Institute for Occupational Safety and Health (NIOSH), U.S. Assistant Secretary means the Assistant Secretary of Labor for Occupational Safety and Health, U.S. For the purposes of this section the following definitions apply: Action level means a concentration of airborne respirable crystalline silica of 25 μg/m 3, calculated as an 8-hour TWA. In the weaned piglets house, significant decrement of inhalable (F = 49.43, P << 0.01) and respirable (F = 42.69, P << 0.01) dust concentration was achieved with floor ventilation.Definitions. In the finishing house significant decrement of inhalable (F = 44.35, P << 0.01) and respirable (F = 43.82, P << 0.01) dust concentration was achieved in the third experimental treatment. Dust concentrations were measured by konimeter (Konimeter 10, Karl Zeiss Jena), airflow velocity in ventilation ducts with a turbine anemometer and the airflow velocity at measuring points with hot wire anemometer. These values were compared with three experimental sets of values achieved with: floor, roof and both ventilation systems. Control values were measured in houses with closed doors and windows and all the fans switched off. The lowest horizontal row was positioned at the pigs breathing zone (40 cm above the floor), and the highest (fourth) horizontal row was positioned at the workers breathing zone (160 cm). Dust concentrations and airflow velocities have been measured at 20 measuring points, smoothly positioned over the house cross section, in the net consisting of 4 horizontal and 5 vertical rows. The application of different mechanical extraction ventilation systems in reducing and controlling dust concentrations in weaned and finishing pig houses was analyzed and discussed in this work. Topisirović Goran (Poljoprivredni fakultet, Beograd-Zemun) Influence of different ventilation systems on inhalable and respirable dust particles concentrations distribution in weaning and finishing fattening pig houses Journal of Agricultural Sciences, Belgrade 2003 Volume 48, Issue 2, Pages: 187-204
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