By Jay F. Colinet, Andrew B. Cecala, Gregory J. Chekan, John A. Organiscak, Anita L. Wolfe, Department of Health and Human Services Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health
Compiled by way of the U.S. Dept of health and wellbeing and Human companies, CDC/NIOSH workplace of Mine safeguard and healthiness learn, this 2010 instruction manual used to be constructed to spot to be had engineering controls that may support underground and floor metal/nonmetal mining operations in decreasing employee publicity to respirable silica dirt. The controls mentioned during this instruction manual variety from long-used controls that have built into criteria, to more recent controls, that are nonetheless being optimized
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Normally, the 46 bag operator sits while loading bags, and the OASIS would be installed over his/her position to provide a clean envelope of filtered air down over the worker. ) • LEV. A local exhaust ventilation system is very effective at minimizing the dust exposure to the bag operator while loading bags of product. When designing these systems, the dust generated during bag loading must be pulled down toward the floor to prevent the dust from passing over the worker’s breathing zone as it is captured by the exhaust ventilation system.
2004]. 9%-efficient filter on respirable-sized dusts as compared to using no recirculation filter [NIOSH 2007]. Laboratory testing also showed that the time needed for the interior to stabilize after the door was closed was reduced by more than 50% when using the recirculation filter. • Minimize interior dust sources. Good housekeeping practices are needed to keep enclosure interiors clean, which eliminates inside dust sources. 26 mg/m3) when a floor heater was used. The fan from the floor heater stirred up dust lying on the cab floor [Cecala et al.
In a number of published studies in this area, this technique has been shown to increase the cleaning effectiveness by approximately 14% [Planner 1990]. • Effective belt loading. Providing an effective belt loading area helps to reduce the amount of dust generated during belt loading. The first design goal of an effective system is to reduce belt sag and vibration during ore loading. To do this, some operations are using slider-bar cradles which stabilize this area [Stahura and Marti 1995]. These cradles can be made to provide a shock-absorbing action to cushion the impact during belt loading.