scholarly journals Field study results of a 3rd generation roof bolter canopy air curtain for respirable coal mine dust control

2019 ◽  
Vol 7 (1) ◽  
pp. 79-87 ◽  
Author(s):  
W. R. Reed ◽  
M. Shahan ◽  
S. Klima ◽  
G. Ross ◽  
K. Singh ◽  
...  
Keyword(s):  
Coal Mine ◽  
Occupational Safety ◽  
Dust Control ◽  
Respirable Dust ◽  
Dust Exposure ◽  
Air Curtain ◽  
Roof Bolter ◽  
Study Results ◽  
Canopy Area ◽  
Canopy Air Curtain

AbstractA 3rd generation roof bolter canopy air curtain (CAC) has been developed and constructed by J.H. Fletcher & Co., Inc. As with the previous generation of the CAC, this design uses the principle of providing uniform airflow across the canopy area as recommended by the National Institute for Occupational Safety and Health. The new modifications include a plenum that is constructed of a single flat aluminum plate, smaller-diameter airflow openings, and a single row of perimeter nozzles designed to prevent mine air contaminated by respirable dust from entering the CAC protection zone. Field testing was conducted on this new 3rd generation design showing reductions in coal mine respirable dust exposure for roof bolter operators. Dust control efficiencies for the CAC for the left bolter operator (intake side) ranged from approximately 26%–60%, while the efficiencies for the CAC for the right bolter operator (return side) ranged from 3% to 47%.

scholarly journals Development of a roof bolter canopy air curtain for respirable dust control

2017 ◽  
Vol 69 (1) ◽  
pp. 33-39 ◽  
Author(s):  
W.R. Reed ◽  
G.J. Joy ◽  
B. Kendall ◽  
A. Bailey ◽  
Y. Zheng
Keyword(s):  
Dust Control ◽  
Respirable Dust ◽  
Air Curtain ◽  
Roof Bolter ◽  
Canopy Air Curtain

scholarly journals A field study of a roof bolter canopy air curtain (2nd generation) for respirable coal mine dust control

2019 ◽  
Vol 29 (5) ◽  
pp. 711-720 ◽  
Author(s):  
W.R. Reed ◽  
S. Klima ◽  
M. Shahan ◽  
G.J.H. Ross ◽  
K. Singh ◽  
...  
Keyword(s):  
Field Study ◽  
Coal Mine ◽  
Dust Control ◽  
Air Curtain ◽  
2Nd Generation ◽  
Mine Dust ◽  
Roof Bolter ◽  
Canopy Air Curtain

Silicosis in rhinestone-manufacturing workers in South China

2019 ◽  
Vol 69 (7) ◽  
pp. 475-481 ◽  
Author(s):  
C Wen ◽  
X Wen ◽  
R Li ◽  
S Su ◽  
H Xu
Keyword(s):  
South China ◽  
Dust Control ◽  
Control Measures ◽  
Respirable Dust ◽  
Dust Exposure ◽  
Quartz Content ◽  
Total Dust ◽  
Silica Dust ◽  
Exposure Limit ◽  
And Control

Abstract Background Silicosis is caused by long-term exposure to silica dust. Crystal rhinestone workers can be exposed to high levels of silica dust and are at risk of silicosis. Aims To explore silicosis cases, silica dust exposure and control measures in a rhinestone factory in South China. Methods We extracted and analysed data on new silicosis cases reported to China’s occupational disease and occupational health information monitoring system between 2006 and 2012 from a rhinestone factory in South China. We measured the quartz content of bulk dust, static total and respirable dust samples. Results Ninety-eight silicosis cases were reported between 2006 and 2012. The mean duration of silica dust exposure was 9.2 years (range 3–16). Drilling and polishing workers accounted for 96 (98%) of cases. We collected 1479 static samples including 690 total dust and 789 respirable dust samples. Mean dust levels for drilling were 1.01 mg/m3 (range 0.20–3.80) for total dust and 0.51 mg/m3 (range 0.04–1.70) for respirable dust. Mean dust levels for polishing were 0.59 mg/m3 (range 0.20–2.10) for total dust and 0.28 mg/m3 (range 0.08–0.71) for respirable dust. Over a third [289/789 (37%)] of total dust samples and 129/690 (19%) respirable dust samples exceeded the national permissible exposure limit. Conclusion Exposure to silica dust, ineffective dust control measures and inefficient health surveillance may have contributed to the incidence of silicosis in the factory we studied. Identification of silica dust exposure and effective dust control measures would reduce the risk of silicosis in rhinestone workers.

The Research and Application of Efficient Dust Control System for Whole-Rock Comprehensive Mechanization Driving Face

2014 ◽  
Vol 955-959 ◽  
pp. 1020-1023 ◽  
Author(s):  
Wen Nie ◽  
Nai Guo Wang ◽  
Wei Min Cheng ◽  
You Ying Ma ◽  
Ya Ru Sun
Keyword(s):  
Control System ◽  
Short Distance ◽  
Coal Dust ◽  
Dust Control ◽  
Respirable Dust ◽  
High Concentration ◽  
Air Curtain ◽  
Random Movement ◽  
Comprehensive Mechanization ◽  
Purification System

To prevent high concentration dust on whole-rock comprehensive mechanization driving face efficiently, air curtain dust drawing and purification system were developed. This system is consisted of two sections, air curtain dust drawing device and dust purification system device. It determines optimized parameters of air curtain drawing dust device by combining site actual conditions and has realized short distance 3d dust absorbing and random movement. After using the efficient dust control system for whole-rock comprehensive mechanization driving face on south main return way,the average dust-laying rate of total coal dust and respirable dust in manually operation department, respectively reach 91.6% and 90.5%.It shows that this system is a efficient means for dust control of whole-rock comprehensive mechanization driving face.

Field Testing of Roof Bolter Canopy Air Curtain Operating Downwind of the Continuous Miner

2020 ◽  
Author(s):  
William R. Reed ◽  
Michael Shahan ◽  
Vasu Gangrade ◽  
Garron Ross ◽  
Kunal Singh ◽  
...  
Keyword(s):  
Field Testing ◽  
Air Curtain ◽  
Continuous Miner ◽  
Roof Bolter ◽  
Canopy Air Curtain

scholarly journals Estimating Respirable Dust Exposure from Inhalable Dust Exposure

2020 ◽  
Vol 64 (4) ◽  
pp. 430-444 ◽  
Author(s):  
Cornelia Wippich ◽  
Jörg Rissler ◽  
Dorothea Koppisch ◽  
Dietmar Breuer
Keyword(s):  
High Temperature ◽  
Occupational Safety ◽  
Occupational Safety And Health ◽  
Respirable Dust ◽  
Dust Exposure ◽  
Power Functions ◽  
Data Set ◽  
Safety And Health ◽  
Inhalable Dust ◽  
High Temperature Processing

Abstract In the sector of occupational safety and health only a limited amount of studies are concerned with the conversion of inhalable to respirable dust. This conversion is of high importance for retrospective evaluations of exposure levels or of occupational diseases. For this reason a possibility to convert inhalable into respirable dust is discussed in this study. To determine conversion functions from inhalable to respirable dust fractions, 15 120 parallel measurements in the exposure database MEGA (maintained at the Institute for Occupational Safety and Health of the German Social Accident Insurance) are investigated by regression analysis. For this purpose, the whole data set is split into the influencing factors working activity and material. Inhalable dust is the most important predictor variable and shows an adjusted coefficient of determination of 0.585 (R2 adjusted to sample size). Further improvement of the model is gained, when the data set is split into six working activities and three material groups (e.g. high temperature processing, adj. R2 = 0.668). The combination of these two variables leads to a group of data concerned with high temperature processing with metal, which gives rise to a better description than the whole data set (adj. R2 = 0.706). Although it is not possible to refine these groups further systematically, seven improved groups are formed by trial and error, with adj. R2 between 0.733 and 0.835: soldering, casting (metalworking), welding, high temperature cutting, blasting, chiseling/embossing, and wire drawing. The conversion functions for the seven groups are appropriate candidates for data reconstruction and retrospective exposure assessment. However, this is restricted to a careful analysis of the working conditions. All conversion functions are power functions with exponents between 0.454 and 0.946. Thus, the present data do not support the assumption that respirable and inhalable dust are linearly correlated in general.

Field Evaluation of the Ultrasonic Personal Aerosol Sampler (UPAS) for Respirable Dust Exposure in a Taconite Mine

2020 ◽  
Author(s):  
Nima Afshar-Mohajer ◽  
Rebecca Foos ◽  
Gurumurthy Ramachandran ◽  
John Volckens
Keyword(s):  
Traditional Method ◽  
Occupational Safety ◽  
Personal Exposure ◽  
Occupational Safety And Health ◽  
Respirable Dust ◽  
Health Concern ◽  
Dust Exposure ◽  
Health Administration ◽  
Safety And Health ◽  
The Impact

Abstract Exposure to respirable dust (RD; the mass fraction of inhaled particles that penetrate to the unciliated airways) is a major health concern in a variety of workplaces. While the estimation of personal exposure is an essential step in protecting worker health from aerosol hazards, the traditional method for assessing personal exposure to RD, suggested by the National Institute for Occupational Safety and Health (NIOSH method 0600), requires equipment that is heavy, bulky, noisy, and has the need of frequent calibration. The ultrasonic personal aerosol sampler (UPAS) is a new personal sampling technology designed to address some of these drawbacks associated with traditional sampling methods. In this study, we field tested and evaluated the performance of the UPAS for assessing worker exposure to RD in a taconite mine. Mineworkers (n = 39) from various job categories were recruited to wear both UPAS and NIOSH 0600 samplers on a work vest to estimate time-weighted exposure to RD. A strong linear relationship was observed (NIOSH method 0600 = 1.06 (UPAS) −9.22 µg m–3, r2 of 0.72, and Pearson correlation coefficient of 0.854). None of the workers were exposed to a RD concentration above the Occupational Safety and Health Administration permissible exposure limit (5 mg m–3). A Bland–Altman analysis revealed that 72% of the valid UPAS samples agreed within ±25% of the traditional method mean. The impact of job category on the correlation of the methods was not statistically significant. This work suggests that the UPAS may present a viable alternative for assessing personal exposure to RD in the workplace.

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