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Book Triggered Barriers for the Suppression of Coal Dust Explosions

Download or read book Triggered Barriers for the Suppression of Coal Dust Explosions written by United States. Bureau of Mines and published by . This book was released on 1979 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dust Dispersal by Explosion induced Airflow

Download or read book Dust Dispersal by Explosion induced Airflow written by Joseph M. Singer and published by . This book was released on 1976 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Rock Dust Remedy for Coal Mine Explosions

Download or read book The Rock Dust Remedy for Coal Mine Explosions written by Harry Phythyon and published by . This book was released on 1926 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Tests in the Experimental Coal Mine Determine Requirements for Preventing Propagation of Coal dust Explosions in Rooms

Download or read book Tests in the Experimental Coal Mine Determine Requirements for Preventing Propagation of Coal dust Explosions in Rooms written by Henry C. Howarth and published by . This book was released on 1948 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Towards Estimating Entrainment Fraction for Dust Layers

Download or read book Towards Estimating Entrainment Fraction for Dust Layers written by Erdem A. Ural and published by Springer Science & Business Media. This book was released on 2012-03-08 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Towards Estimating Entrainment Fraction for Dust Layers closely examines the factors that can affect the assessment of a dust hazard, and outlines a new strawman method designed to help practitioners estimate the fraction of the dust accumulations that can become airborne. This book also aims to provide aid in the removal of aerodynamic disturbances of dust particles or agglomerates from layers or piles of cohesive and non-cohesive dusts. Towards Estimating Entrainment Fraction for Dust Layers is designed for practitioners as a reference guide for improving dust hazard assessment. Researchers working in a related field will also find the book valuable.

Book Effect of Rock Dust on Explosibility of Coal Dust

Download or read book Effect of Rock Dust on Explosibility of Coal Dust written by James Kenneth Richmond and published by . This book was released on 1975 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Rock dust Does Stop Or Limit Mine Explosions

Download or read book Rock dust Does Stop Or Limit Mine Explosions written by Daniel Harrington and published by . This book was released on 1932 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways

Download or read book Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways written by Department of Health and Human Services and published by CreateSpace. This book was released on 2013-10 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The workings of a bituminous coal mine produce explosive coal dust for which adding rock dust can reduce the potential for explosions. Accordingly, guidelines have been established by the Mine Safety and Health Administration (MSHA) about the relative proportion of rock dust that must be present in a mine's intake and return airways. Current MSHA regulations require that intake airways contain at least 65% incombustible content and return airways contain at least 80% incombustible content. The higher limit for return airways was set in large part because finer coal dust tends to collect in these airways. Based on extensive in-mine coal dust particle size surveys and large-scale explosion tests, the National Institute for Occupational Safety and Health (NIOSH) recommends a new standard of 80% total incombustible content (TIC) be required in the intake airways of bituminous coal mines in the absence of methane. MSHA inspectors routinely monitor rock dust inerting efforts by collecting dust samples and measuring the percentage of TIC, which includes measurements of the moisture in the samples, the ash in the coal, and the rock dust. These regulations were based on two important findings: a survey of coal dust particle size that was performed in the 1920s, and large-scale explosion tests conducted in the U.S. Bureau of Mines' Bruceton Experimental Mine (BEM) using dust particles of that survey's size range to determine the amount of inerting material required to prevent explosion propagation. Mining technology and practices have changed considerably since the 1920s, when the original coal dust particle survey was performed. Also, it has been conclusively shown that as the size of coal dust particles decreases, the explosion hazard increases. Given these factors, NIOSH and MSHA conducted a joint survey to determine the range of coal particle sizes found in dust samples collected from intake and return airways of U.S. coal mines. Results from this survey show that the coal dust found in mines today is much finer than in mines of the 1920s. This increase in fine dust is presumably due to the increase in mechanization. In light of this recent comprehensive dust survey, NIOSH conducted additional large-scale explosion tests at the Lake Lynn Experimental Mine (LLEM) to determine the degree of rock dusting necessary to abate explosions. The tests used Pittsburgh seam coal dust blended as 38% minus 200 mesh and referred to as medium-sized dust. This medium-sized blend was used to represent the average of the finest coal particle size collected from the recent dust survey. Explosion tests indicate that medium-sized coal dust required 76.4% TIC to prevent explosion propagation. Even the coarse coal dust (20% minus 200 mesh or 75 µm), representative of samples obtained from mines in the 1920s, r equired approximately 70% TIC to be rendered inert in the larger LLEM, a level higher than the current regulation of 65% TIC. Given the results of the extensive in-mine coal dust particle size surveys and large-scale explosion tests, NIOSH recommends a new standard of 80% TIC be required in the intake airways of bituminous coal mines in the absence of methane. The survey results indicate that in some cases there are no substantial differences between the coal dust particle size distributions in return and intake air courses in today's coal mines. The survey results indicate that the current requirement of 80% TIC in return airways is still appropriate in the absence of background methane.

Book Monthly Catalogue United States Public Documents

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1992 with total page 1384 pages. Available in PDF, EPUB and Kindle. Book excerpt: