background: the traditional cyclone has been developed for the removal of airborne silica particles from local exhaust ventilation (lev). the objective of this research was to evaluate the effects of velocity and particles load on efficiency of cyclone in the stone crushing units at azendarian area. methods: after the designing and installing the traditional cyclone, downstream and upstream sam...

As mining operations in the United States (US) have become more productive, con­ trolling the dust exposure of mine workers has become more challenging. In response, US mining operations are applying basic controls at elevated levels and are looking to emerging control tech­ nologies in an effort to better control airborne respirable dust levels. The Pittsburgh Research Laboratory (PRL) of the ...

Breathing dust that contains respirable crystalline silica can lead to silicosis, a deadly lung disease. Respirable dust is that fraction of the aerosol that is small enough to reach the deeper, gas-exchange regions of the lungs. No effective treatment exists for silicosis, but it can be prevented by controlling workers’ exposures to dust containing crystalline silica. Exposure to crystalline s...

Whenever coal is stockpiled and, particularly, when it is transported, dumped or otherwise handled, there is the potential for release of small particles (i.e. dust) of coal in significant quantities. The range of sizes of these particles is considerable; visible coal dust (i.e. as a black cloud) is one extreme of the possible range of particle dimensions but within any such dust cloud there wi...

THOMAS F. TOMB, PAULS. PAROBECK, and ANDREW J. GERO Pittsburgh Health Technology Center, Mine Safety and Health Administration was greater than five percent. Such a formula was developed and is included in Parts 70.101, 71.101, and 90.101 of Title 30, Code of Federal Regulations (CFR). These regulations state that: "When the respirable dust in the mine atmosphere of the active workings contains...

The single cut measurement of exposure to respirable dust is the accepted method of exposure classification in occupational hygiene. We previously showed that actual pulmonary tissue dose may be substantially different from the dose expected, or the indicated dose, based on measurements using current single cut methodologies. We now examine exposure misclassification of workers based on any sin...

The divergent sampling techniques for respirable dust and the analyses for crystalline silica are an important area of interest and discussion among industrial occupational hygienists in Europe. The variety of equipment for air sampling, methods and instrumentation can cause differences between results for the analysis of respirable crystalline silica (RCS). In this study, a Workplace Atmospher...

Respirable crystalline silica dust generated during stone crushing operations has been linked to chronic lung disease and increased risk of tuberculosis. In India, most stone crushing mills operate without any dust control or containment systems. This investigation in the Khurda District of Orissa demonstrated a reduction in respirable particulate mass following the application of a fine mist o...

Objectives: This study aimed to assess exposure to crystalline silica and its relation with risk of pulmonary functional disorders among workers of a cement industry in Saveh, Iran.Methods: In this cross-sectional study, 62 samples of respirable dust were collected from breathing zone of workers in different sections of a 4-years-old cement factory in 2011. Determination ofrespirable dust conce...