1 edition of MSHA"s procedure for determining quartz content of respirable coal mine dust found in the catalog.
MSHA"s procedure for determining quartz content of respirable coal mine dust
by U.S. Dept. of Labor, Mine Safety and Health Administration in [Washington, D.C.?]
Written in English
|Series||Informational report -- IR 1152, Informational report (United States. Mine Safety and Health Administration) -- 1152|
|Contributions||United States. Mine Safety and Health Administration|
|The Physical Object|
|Pagination||13 p. :|
|Number of Pages||13|
quartz content of respirable dust in the atmosphere exceeded 5 percent.(FOOTNOTE 2) The formula, which issued in March , 30 C.F.R. , required that whenever the "concentration of respirable dust in the mine atmosphere" contained "more than 5 percent quartz" the applicable respirable dust standard for that working. mg less respirable coal mine dust per m 3 of inhaled air × 10 m 3 inhaled air per shift × affected shifts (i.e., % of ) per work year × 45 work years per working lifetime = 21, mg less respirable coal mine dust inhaled per working lifetime.
In the Federal Coal Mine Health and Safety Act of , coal workers pneumoconiosis (CWP) was defined as "a chronic dust disease of the lung arising out of employment in an underground coal mine." Diagnosis of CWP is generally based on chest x-ray findings and a patient's history of working in coal mines, usually for 10 or more years. ARLINGTON, VA. – Despite concerns voiced by the mining industry that it would have trouble meeting the requirements of the rule to reduce respirable coal mine dust, approximately 99 percent of the 7, valid respirable dust samples collected during the first two months under the new rule met compliance levels, according to the U.S. Department of Labor’s Mine Safety and Health. The Mine Safety and Health Administration (MSHA) analyzes respirable coal mine dust samples for quartz content using infrared spectrometry. Samples are low-temperature ashed in an oxygen plasma.
MSHA's existing standard for MNM mines is 10 mg/m /(percent respirable quartz + 2) expressed as the concentration of respirable dust for a full shift or an 8-hour equivalent time-weighted average (TWA). 1. Introduction. Coal Workers' Pneumoconiosis (CWP) is a lung disease that results from breathing in coal dust over a long period of time. Several factors increase a person's risk of developing pneumoconiosis such as the concentration of respirable coal dust, coal dust particle size and its composition, free silica content (quartz minerals), the duration of exposure, age, work environment Cited by: respirable coal mine dust sampling inspections, evaluating sampling results, establishing and removing sampling entities, establishing reduced dust standards due to quartz, and monitoring the operators' respirable dust control and sampling programs. This document supersedes the previously issued Chapter 1. II. Authority.
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SyntaxTextGen not activatedForty-six samples of each dust type were collected from twenty-six pdf. Dust size distributions were determined for pdf sample. The quartz content was also determined for forty samples.
The fraction of pre-cleaner dust smaller than 10 micrometers ranged from % to %. Quartz content, by weight, of the pre-cleaner dust ranged from %. Current standards limit exposures to quartz (crystalline silica) in respirable dust.
The coal mining industry standard is based on the formula 10 mg/m3 divided by the percentage of quartz where the quartz percent is greater than 5 percent calculated as an MRE equivalent Size: KB.The Mine Safety and Health Administration (MSHA) regulates silica exposure ebook determining and enforcing compliance with the respirable dust standard for each active mine section.
The MSHA strategy for regulation is examined in the context of respirable free crystalline silica and dust data.